Introducing Our Human Practices Approach: The IMPACT Framework
In our iGEM journey, we have adopted the "IMPACT Framework" as the guiding philosophy for our Human Practices endeavors. This holistic framework, rooted in the principles of Ideation, Mobilization, Purpose, Adaptation, Collaboration, and Transparency, has shaped how we bridge the gap between synthetic biology and real-world challenges.
Ideation - Connecting with Local Realities
Our journey began by embracing iGEM's vision of "local people solving local problems". We initiated a deep
exploration of the issues faced in Manipal, Karnataka, our home ground. By engaging with the local
community and collaborating with university professors who had previously worked on pressing problems in the
Udupi district, we embarked on a mission to discover a local issue that our team could tackle with determination
and dedication. We found out that industrial effluents were discharged near Manipal at the Udyavara River and
Indrani River, making the water murky and discolored and causing the death of fish in the rivers and its
tributaries, endangering the people's livelihoods. The polluted rivers contaminated the groundwaters, seeped
into the wells, and contaminated drinking water, inducing adverse health effects, such as fevers and skin rashes,
in the local population [1]. While attempting to identify the causative agents for the damage caused, we
identified many pressing concerns—particularly the accumulation of triclocarban (TCC) in local wastewater
treatment plants, threatening aquatic life, our coastal fisheries, and our agricultural framework.
Mobilization - Strategic Planning and Resource Allocation
At each stage of our project, we meticulously crafted project plans outlining goals, milestones, and timelines,
ensuring our efforts were focused and well-coordinated. Recognizing the significance of resources, we mobilized
the necessary human, financial, and technological assets and conducted meetings online with prominent people
in protein engineering, synthetic biology, and wastewater treatment. We also proactively addressed potential
challenges through comprehensive risk assessments, which helped us identify the problem with our initial idea of
enzyme efficiency enhancement.
Purpose - Alignment with Values and Community Need
Our project remained firmly grounded in our team's core values, iGEM principles, and ethical considerations. We
actively listened to the needs and concerns of relevant communities, including chemical industries, wastewater
treatment plants, and the local public. This dialogue allowed us to establish a clear, purpose-driven
mission benefiting our local community and the environment, establish methods to talk to people about genetically
modified organisms, and reassess the importance of a kill switch in our project.
Adaptation - Continuous Improvement and Learning
We used adaptability as a guiding principle, allowing us to adjust strategies and tactics based on feedback and
evolving circumstances. It was often disheartening when we realized that an idea we previously worked on had
reached a roadblock. However, we fostered a learning culture from our setbacks; our team continuously sought
growth opportunities. This is how our project evolved from enzyme modification to metabolic engineering followed
by our final degradation pathway and selection of suitable chassis.
Collaboration - Active Partnerships and Achievement of Goal
Collaboration was central to our approach. By actively seeking partnerships with universities worldwide and
with external organizations such as non government environmental protection organizations, we utilized these
partnerships to enhance our project's impact and work towards a greater good. By setting mutually agreeable goals,
we successfully collaborated with them to accomplish our goals.
Transparency - Open Communication and Accountability
Effective communication was the pillar of our interactions. We maintained open and transparent channels
within our team and with external stakeholders, fostering clarity and trust. Ethical accountability was
paramount—we held ourselves responsible for ethical conduct and commitments to our stakeholders. Our thorough
documentation of the entire process has helped ensure that our insights and knowledge were accessible and usable
by others.
The "IMPACT Framework" has served as our compass, guiding our team to develop
innovative solutions that align with our values, address real-world needs, and adapt to changing circumstances.
Through collaboration and transparency, we have fortified our connections and accountability, ultimately
magnifying the positive impact of our synthetic biology project.
Sustainable Development Goals
The Sustainable Development Goals (SDGs), also known as the Global Goals adopted by
the United Nations in 2015, aim to end poverty, protect the planet, and ensure that all people enjoy peace and
prosperity. The 17 SDGs are integrated – they recognize that action in one area will affect outcomes in others and
that development must balance social, economic, and environmental sustainability. Throughout our project, we have
kept these SDGs in mind and worked towards fulfilling them and understanding the interconnectivity of these
goals.
Stakeholder Approach
The effect of any project or product can only be impactful if the project's stakeholders
are kept in mind during the design process. Stakeholders will be affected by the implementation of a project or
can assist in developing the project such that the implementation adheres to environmental and scientific
guidelines; this helps us understand how our project impacts the world and how the world impacts our
project.
Stakeholder-Specific SWOT Analysis
Integrated Human Practices
Instead of creating a general SWOT analysis for our project we conducted a SWOT analysis for
each of our five stakeholder categories. A generalized stakeholder analysis would have given us a breakdown of who
our stakeholders are. However, since we had already identified our stakeholders, we used this categorized SWOT
analysis. Using our stakeholder-specific SWOT analysis, we prepared questions and approached stakeholders
accordingly. We used the analysis to weigh the inputs given by the stakeholders and focussed on the weaknesses and
threats to analyze the necessity of integrating their opinions into our project and how to explore further
opinions within the same stakeholder category.
Our Stakeholder Interactions
Dept. of Chemical Engineering, Manipal Institute of Technology, Manipal, India
06/03/2023
Assistant Professor of Civil Department, Manipal Institute of Technology, Manipal, India
06/03/2023
Researcher at Institute of Bioinformatics, Bangalore
10/05/2023
Head of the Department of B.Sc. Biotechnology at Manipal School of Life Sciences, Manipal
12/05/2023
Associate Professor at the Department of Electronic and Communication Engineering, MIT Manipal
12/05/2023
Designation: To be kept anonymous
13/05/2023
Designation: To be kept anonymous
11/06/2023
Professor at IIT Kanpur
10/06/2023 and 12/06/23
Instructor for iGEM Thrace
15/06/2023
To be kept anonymous
03/07/2023
Owner of Water Treat Supply and Services, Cuttack, Odisha
06/07/2023
Managing Director of Reliance Detergents & Disinfectants, Jagatpur, Odisha
06/07/2023
Co-Founder of Nature Conservancy Consultancy Pvt. Ltd., Bhubaneswar, Odisha
06/07/2023
16/07/2023
Assistant Professor in Biotechnology at GSFC University, Vadodara, Gujarat
13/07/2023
25/07/2023
Head of the Department of Atomic and Molecular Physics, Manipal Institute of Technology, Manipal
25/07/2023
Researcher at National Institute of Singapore, Singapore
25/07/2023
28/07/23-30/07/23
Co-Founder and Director of Quadrasystems.net India Pvt. Ltd.
01/08/2023
Assistant Professor-Selection Grade at Department of Biotechnology, Manipal
22/08/2023
Lab Manager at UNSW, Australia
01/09/23
Associate Director-Development, Manipal Institute of Technology, Manipal
07/09/2023
Professor at the Department of Biotechnology, Manipal Institute of Technology, Manipal, India
10/09/2023
15/09/23
Owner of Water Treat & Supply Services, Cuttack, Odisha
20/09/23
Senior Lecturer and Group Leader at Monash University, Melbourne, Australia
21/09/2023
Associate Director at the Institute of Marine and Environmental Technology, Baltimore, Maryland, USA
26/09/23
Professor at the Department of Chemical Engineering, Indian Institute of Technology, Tirupati
30/09/2023
DPhil candidate at the University of Oxford
04/10/2023
Associate Professor, Department of Physics, Manipal Institute of Technology
05/10/2023 & 08/10/2023
Discussion:
During our discussion with Dr. S. Raja, a specialist in emerging pollutant removal from wastewater, he
suggested investigating the infiltration process for potential harmful substance release. He advised
exploring the Fenton catalyst for degradation, examining TCC solubility, and using LCMS and HPLC
for estimation. Our discussion also highlighted the inefficiencies of existing treatment methods in
degrading harmful substances, posing environmental risks. Dr. Raja generously shared research papers to
enhance our understanding.
Inference:
The shared research papers from Dr. Raja helped enrich our knowledge significantly. The discussion with
him made us realize the necessity of an idea like ours. We further analyzed the solubility of TCC in water
and various other solvents like acetone and acetonitrile based on his suggestion.
Discussion:
We gained valuable insights during our project discussion with Dr. Shetty. As his research centers on
addressing environmental challenges, his input was particularly relevant to our work. He recommended
visiting our local community's wastewater treatment plants to understand their operational
processes better.
Dr. Shetty also provided specific advice related to our implementation mechanism. He suggested
implementation methods like activated carbon, sequencing batch reactor, and membrane reactor. Further, he
mentioned the WHO standards which should be taken into account while designing our project. Additionally,
he even offered to arrange industry wastewater samples for our wet lab testing needs.
Inference:
Based on the advice and suggestions given by Dr. Shetty, we designed our implementation process keeping in
mind that it doesn't harm the environment. The discussion with him about the types of bioreactors
for sludge treatment was also useful in the later stages of the project.
Discussion:
During our discussion with Mr. Khade regarding our goal to increase the efficiency of the enzyme to
degrade the target, he expressed that we must look beyond enzyme docking and conduct in-vitro studies. For
experimental purposes, he advised us to establish a standard curve using samples with known concentrations
of Triclocarban (TCC). He outlined a methodology for preparing for the same. It was essential to conduct
all experiments in replicates to ensure greater accuracy. To assess the enzyme's impact on these samples,
we could extract equal volumes from them at regular intervals. HPLC or LCMS could measure the quantity of
products generated or the extent of substrate degradation. Mr. Khade encouraged us to consult the
Michaelis–Menten kinetics rate equation and explore relevant research papers.
Inference:
Mr. Khade's guidance was instrumental in conducting wet lab studies for TCC detection. We conducted
iterative experimentation as suggested and created multiple samples of varying TCC concentrations to
create a standard curve using a UV-visible spectrometer. We also used the Michaelis-Menten rate equation
to study the degradation kinetics of our bioreactor design later in the project.
Discussion:
Our meeting with Dr. Paul occurred when we were in the nascent stages of our project, using computational
methodologies to improve the amidase enzyme. Dr. Bobby Paul guided us during this phase. He suggested that
we study different versions of the TccA amidase enzyme to help create a better one. He also advised us to
explore alternative organisms besides Ochrobactrum sp. that might have a more proficient amidase to
break down triclocarban (TCC). He introduced us to a software tool called Polyphen, which is adept at
introducing mutations into enzymes and predicting their resultant structural conformations. He also
encouraged us to learn about enzyme kinetics for our project.
Inference:
Even though our initial project idea changed, Dr. Paul’s inputs turned out to be instrumental in our
ideation stage. We looked into alternative organisms on his suggestion, and that helped us ensure that we
had made the right choice.
Discussion:
We reached out to Dr. Tiwari, intending to discuss various techniques for detecting triclocarban (TCC).
During our conversation, he suggested implementing microcontrollers and paper microfluidics as
potential avenues.
Furthermore, he highlighted the significance of delving into TCC's distinctive electrical properties and
molecular structure. Such an approach could enhance the sensor's specificity to TCC. Dr. Tiwari also
floated the idea of investigating specific chemical reactions triggered by TCC, which could manifest as
observable color changes. Harnessing these reactions, he posited, could serve as the foundation for
constructing our sensor.
Inference:
On Dr. Tiwari’s suggestion, we looked into the color changing properties and chemical reactions
triggered by TCC. However, we could not find any data on it and hence, he helped us rule out
colorimetric and electrochemical sensors. After this, we moved on to enzyme-based biosensors to
detect TCC
Discussion:
Our discussion with Ms. Shreya was initiated with a focus on elevating the binding energy of our enzyme
and understanding its direct relationship with degradation efficiency. The conversation then shifted
towards our goal of enhancing the stability and efficiency of our modified enzyme. Shreya discussed
utilizing the Kcat/Km equation and Michaelis-Menten equations for analyzing enzyme efficiency. This
process included creating standard curves, detecting TCC levels, and calculating product concentrations.
Shreya emphasized the importance of running control samples, performing statistical analysis, and
ensuring triplicate runs for reliable results.We also delved into the specifics of testing and analyzing
compounds in water samples, mainly focusing on triclocarban (TCC) present at ppb levels.
Inference:
We realized from our discussion with Shreya the importance of conducting our experiments step-by-step
and generating robust data for subsequent statistical analysis. Following her advice, we also run
control samples while carrying out growth curves experiments in the wet lab.
Discussion:
Akshara Gopinath, an expert in environmental resources management, shared invaluable insights during our
discussion. Akshara highlighted the absence of concrete regulations on GMO usage in wastewater treatment
plants and recommended exploring European Union (EU) rules as a reference point. She also emphasized the
significance of examining health and safety standards, notably the International Finance Corporation (IFC)
parameters, for treated water and its suitability for domestic use.
The conversation further delved into the complex aspect of social acceptance concerning GMOs,
acknowledging the challenges. Akshara advised us to conduct a thorough analysis encompassing carbon
emissions, waste emissions, scalability, and project costs. She underlined that the Pollution Control
Board would likely require an environmental impact assessment for our project. To engage with the
community, Akshara encouraged us to initiate discussions with NGOs, municipal bodies, and educational
institutions to raise awareness and foster the acceptance of GMOs in our project. Given the existing
reservations around GMOs, she stressed the importance of transparency in sharing the results of safety
testing we undertake to gain public trust.
Inference:
The discussion with her was instrumental in creating awareness about GMOs and environmental
regulations among our team members. It allowed us to delve deeper into the topic and get a better
understanding of the environmental concerns associated with our project. Hence, we made sure to have a
biocontainment strategy, a kill switch as a part of our future implementation.
10/06/2023
Discussion:
With Dr. Ramanathan's expertise in enzymology, the interaction with him was instrumental to our project.
Not only did he spot inconsistencies in our proposed degradation pathway, which needed a fixture,
but he also advised us to survey the toxicity of byproducts formed using the amidase. He mentioned that we
should explore the role of metal ions and other cofactors in enzyme catalysis, try to superimpose urease
with amidase and find the data for hydrolysis of TCC. He informed us about how metal ions play an
essential role in the catalytic activity of an enzyme. Citing and recommending Tinkering With Enzymes by
Jermy R Knowles, he stated that the catalytic efficiency of an enzyme interacting with its native
substrate cannot be increased. Catalytic efficiency is inherently at its maximum. To understand protein
folding better, he suggested we read Richard Dawkins's Blind Watchmaker as well.
12/06/23
In the subsequent meeting with him, we discussed the material he suggested we go through. We proposed the
following methods to improve enzyme efficiency: replacing one amino acid with an isosteric residue of a
different function or replacing one amino acid with another of identical functions, resulting in a
different structure. Unfortunately, we concluded that it would be difficult to increase the efficiency of
the amidase as modification of the residues will harm the enzyme's function. Nature by itself ensures
that absolute efficiency is achieved and no product goes wasted, and trying to increase it given our
constraints was an unrealistic expectation.
Inference:
His insights caused a significant shift in our project approach, where we changed our focus from enzyme
modification to a novel biodegradation pathway for TCC such that it breaks down to form non-toxic
products that enter the TCA metabolic cycle.
Discussion:
Mr. Sotiris suggested incorporating machine learning to optimize the direct evolution process. He advised
that we tweak the enzyme sequence through amino acid modification and docking simulations. He stressed the
need for in vitro lab techniques and validation of our in-silico results in the wet lab. The possibility
of using two enzymes to degrade TCC into non-toxic products like cis muconic acid was first
introduced by him, and he considered it to be a better approach than modifying the amidase enzyme to
increase its efficiency.
Inference:
Mr Sotiris's suggestion of using two enzymes to degrade TCC made us look into the complete degradation of
TCC into non-toxic byproducts using multiple enzymes. Acinetobacter baylyi, Pseudomonas
putida, and Pseudomonas fluorescens are the most favorable options to degrade the toxic
byproducts of TCC, hence completing our degradation pathway.
Discussion:
We visited two wastewater treatment plants located in the Manipal region. These visits were instrumental
in gaining practical insights into the treatment processes. The resident engineers generously shared their
expertise at the first wastewater treatment plant, which exclusively processed domestic wastewater. They
provided us with a comprehensive understanding of the sequential steps involved in water purification.
This clarity was precious for us as we intended to target the aeration tank in our project. During our
discussion, the engineers emphasized the duration that one cubic meter (1m³) of water typically
spends within the aeration tank, shedding light on a critical parameter for our project planning. Notably,
the engineers stressed the significance of maintaining a stable bacterial ecosystem within the aeration
tank, with around 30% bacteria.
Inference
The information provided by the engineers prompted us to contemplate the feasibility of using an enzyme
vs. an entire bacterium in our proposed solution. This consideration was a crucial turning point in
our project design, suggesting a more efficient and precise approach to achieving our goals.
Discussion:
Mr. Swain's company manufactures and sets up pretreatment wastewater treatment plants (WWTPs) in Odisha.
We discussed our project with him in a regional language (Odia) and gained industrial insights. He
explained the differences between pretreatment plants, effluent treatment plants (ETPs), and sludge
treatment plants (STPs). He was aware of and open to GMOs in bioremediation but expressed concern
regarding their extravagant cost. He highlighted variations in WWTPs for borewell and river water,
emphasizing on the absence of aeration tanks in the former. He even suggested implementing our
solution in TCC-utilizing companies' ETPs to reduce chemical waste in rivers.
Inference
His guidance opened our eyes to implementing our solution in STPs as the concentration of TCC is
higher in the sludge than in the effluent, thus broadening our project's scope.
Discussion:
During our meeting with Mr. Rajesh Kanungo, we discussed our project and the possible consequences of TCC
(triclocarban) on aquatic life, agriculture, and human health. One key point during our conversation was
the use of TCC as an antimicrobial agent. However, Mr. Rajesh mentioned that his company doesn’t use this
compound. He explained that incorporating an antimicrobial like TCC into their products would require
obtaining a Drug License, which involves an entirely different set of regulatory procedures.
Inference
We had noticed how larger companies have started phasing out the use of TCC. This discussion highlighted
that even smaller companies are gradually trying to phase out the use of TCC in their products now.
However, there are companies that are still using TCC as an antimicrobial agent. The removal of TCC from
the environment is of utmost importance, which proves the relevance of our project.
Discussion:
With his expertise in different types of WWTPs, Mr. Barik provided valuable insights into the design and
distinctions of ETPs and STPs. Mr. Barik had not previously encountered information about TCC
(triclocarban) but was familiar with the concept of genetically modified organisms (GMOs). One of the
critical aspects we discussed was TCC's adverse impact on the efficiency of nitrogen-fixing bacteria in
WWTPs that play a major role in ammonia degradation. Our proposed implementation was in the aeration
tank of the WWTP. Here, Mr. Barik suggested an alternative approach that we implement our solution in the
equalization tank before the aeration tank. This equalization tank is where various pre-treatment
processes, including pH maintenance, are addressed. By doing so, we could prevent the harmful effects of
TCC on the nitrogen-fixing bacteria in the aeration tank.
Inference
This meeting with Mr. Barik proved to be highly informative, offering us a fresh perspective on the
optimal placement of our solution within WWTPs. On looking further into this, we came up with the
idea of implementing our project in our designed bioreactor.
Discussion:
During our visit to Garden Reach Water Works, we were guided by Mr. P.K. Das, an Executive Engineer with
expertise in Sewage Treatment Plants (STPs) and Water Treatment Plants (WTPs). Mr. P.K. Das gave us a
comprehensive tour of the WWTP, offering valuable insights into its operations. Even though the sewage
treatment plant was not operational during our visit, Mr. P.K. Das elaborated on the crucial
considerations of its construction. We learned that the sewage treatment plant had a 45 Minimal Liquid
Discharge capacity and contained 500 mg/L of dissolved solids. Additionally, we discovered that primary
and activated sludge is predominantly composed of water, with content ranging from 97% to 99%.
Inference
This experience opened our minds to the possibility of designing a sludge-based bioreactor and
emphasized the importance of tailoring our bioreactor to the specific nature of the sludge or water
we intend to treat.
Discussion:
During our meeting with Dr. Sudhir, we discussed managing the metabolic load within engineered
metabolic pathways. He highlighted the intricacies of releasing engineered strains and how they can
trigger significant environmental and health concerns among the general public. In the context of India,
Ankit drew our attention to The Environmental Protection Act, which outlines specific restrictions
concerning engineered organisms in the country. Notably, he mentioned that India has recently approved the
release of CRISPR-edited plants. Leveraging this genetic engineering method for mutagenesis testing could
streamline obtaining permissions from local government authorities. Dr. Ankit concluded our meeting
by suggesting re-evaluating our chosen enzymes and exploring superimposable structures that might
help reduce the genetic insert load.
Inference:
Dr. Sudhir’s insights contributed to the ongoing efforts to efficiently navigate the complexities of
engineered metabolic pathways. His concern regarding the metabolic load on the bacteria got us to explore
other options. Hence, we finally decided to move forward with a chassis that can degrade the
by-products of TCC degradation using its natural metabolic pathways. This way, we would only need to
insert the tccA gene into the chosen chassis, avoiding the issue of high metabolic load.
Discussion:
During our visit to the BWSSB Waste Water treatment plant, we explored the three critical phases of
wastewater treatment: primary, secondary, and tertiary.
In the primary phase, they showed us how raw sewage is pre-treated to remove large debris and floating
materials. They also showed us that the secondary phase involves bacteria breaking down organic matter,
followed by disinfection for non-drinking purposes. Viewing the tertiary treatment phase introduced us to
advanced techniques like reverse osmosis (RO) and Sequential Batch Reactor (SBR). We also discussed how
the treatment method choice depends on sewage quality and intended use. For example, SBR is excellent at
removing pollutants like nitrogen.
A notable point of discussion was the significant amount of untreated wastewater which is often used
for agricultural irrigation in Bangalore.
Inference:
This discussion raised concerns about the environmental impact, especially regarding the presence of
antimicrobial substances like triclocarban in the environment. Hence, we realized the further impact
of TCC on the environment and the relevance of our project.
Discussion:
Dr. George helped us understand the various possible TCC detection and quantification methods. He
mentioned that Raman spectrometry has high specificity compared to other methods. The use of near-infrared
(NIR) spectrometry was discussed but soon dropped since it would be unable to detect TCC at ppb levels in
the effluent, thus giving a broad range spectrum. He brought to our notice that mass spectrometry would be
the most preferred method for quantifying TCC and its daughter compounds. He also pointed out that, in our
case, liquid chromatography-mass spectrometry (LC-MS) would work better than gas chromatography-mass
spectrometry (GC-MS), which is better suited for volatile substances.
Inference
The discussion with Dr. George was fruitful in understanding the pros and cons of various methods that
could be used for TCC detection. Based on his insights and as suggested by other stakeholders earlier as
well, we decided to use LCMS for the quantification of our compounds in the future.
<Discussion:
Dr. Mohapatra is an expert working with many emerging pollutants in water. His study was not specific to
TCC as it was banned in Singapore and is one of the primitive contaminants. However, this makes it all
the more critical for us to solve this problem as a high priority. He explained how hypothesizing the
degradation of other compounds along with TCC due to our modified bacteria would add more value to
our project, giving it a better global impact. Apart from this, he also mentioned that LCMS would be
ideal for TCC quantification in water. He enlightened us about LCMS QTOF (Quadrupole Time of Flight),
which would be more suitable for quantifying the daughter compounds 4-CA and 3,4-DCA.
Inference:
His suggestion pushed us to explore the degradation of other anilines, herbicides, and pesticides
like linuron and diuron by the same metabolic pathway naturally present in numerous bacterial strains.
Discussion:
The All India iGEM Meet (AIIM) hosted by the iGEM team of IISER Bhopal took place at the end of July. A
mock Jamboree presentation was held where all teams presented their projects followed by a poster
presentation on the next day. During the presentation, the questions asked by the judges prompted us to
think of new aspects of the project and how to improve upon it. Further, the interactions with other teams
allowed us to understand and learn from other projects.
The judges were very accepting of the idea of biochar as a matrix but were concerned about the
selectivity of the matrix in adsorbing triclocarban. Further, they mentioned that wastewater would contain
sufficient carbon sources and that the bacteria may or may not utilize TCC. They also believed that the
delivery of our project could be made to be more impactful.
Inference:
The discussion caused us to start looking deeply into the delivery of our project and the work done.
Later, we found that Ochrobactrum sp. constitutively expressed tccA in nature. The TCC
enters the cell through passive transport, allowing it to utilize it as a carbon source.
Discussion:
We conversed with Mr. Prashant regarding our project's commercial aspects. During the discussion, he
enquired about the project's advancement and we presented our conceptual stage supported by relevant
literature. Emphasizing the business perspective of our project, he underscored the significance of
assessing the market size and determining the potential willingness of buyers to invest in our
product. Additionally, he advised us to thoroughly analyze our competitors and consider the
existence of more affordable alternatives.Instead of pursuing direct commercial production, Prashant
proposed a strategic shift towards licensing our ideation process. This suggestion aims to establish
partnerships or collaborations where other entities could use our innovative approach for their
applications under a licensing agreement.
Inference:
Mr. Prashant’s insights pushed us to look into the entrepreneurship aspects of our project further. We
carried out a cost analysis of our batch bioreactor design later into the project.
Discussion:
Dr. Subbalaxmi has experience in enzyme and fermentation technology. Since biochar is a rich carbon
source, she expressed her concerns regarding a biochar-based implementation as the organism would start
consuming biochar leading to its quick depletion. She advised us to plot growth curves and fit the data
into the Monod equation to combat this. She also suggested a bioreactor design using inert
immobilized beads, which are more rigid and offer more resistance to environmental changes. Dr. Subbalaxmi
helped us verify the bioreactor modeling equations and mentioned some parameters we should consider while
building a bioreactor.
Inference:
Based on her suggestions, we fit the growth curve data from the wet lab to the Monod equation for
modeling the bioreactor
Discussion:
As many of our wet lab protocols require us to work with the toxic chemicals triclocarban,
4-chloroaniline, and 3,4-dichloroaniline, we wanted to check the suitability of our safety protocols. The
wet lab team met Lynn, who explained how raising health and safety issues and talking to people in the
workplace regarding safety were necessary.
She suggested using a fume hood with carbon filter respirators while preparing stock solutions of
triclocarban. She also approved our existing use of gloves and safety goggles. She also suggested using
double gloves if we did not have the required glove thickness. She emphasized the importance of
wiping all counters and workspaces with soap and water every evening. She also stated the importance of
going through the 4 °C fridge, throwing out all unwanted samples, and defrosting the -20 °C fridge once a
month.
Inference:
The session with Lynn was very insightful, and we considered many of her suggestions. Even though they
seem like simple lab safety ideas, they have helped us better our lab environment and conduct our
experiments more efficiently.
Discussion:
Dr. Ramachandran Murty is helping our team with designing our bioreactor model. He gave us valuable input
on how we could design the bioreactor having TCC as a rate-limiting substrate while ignoring other
compounds that may be present in the wastewater. Dr. Murty also said that the fouling of the packed bed
can be ignored while working on a lab scale. Further, he recommended that we utilize a pair of
sequential batch reactors to address the issue of the duration for which the sludge must remain in the
reactor. He also advised us to incorporate a sparger to help with sludge aeration, thus supporting the
growth of our microbe, which is aerobic.
Inference:
While doing mathematical calculations, we were concerned about the fouling of the packed bed. However, Dr.
Murty’s suggestion that the fouling can be ignored at the lab scale was helpful for us and simplified
our mathematical modeling.
Discussion:
We designed a 2D diagram of a batch-stirred tank reactor and a batch-packed bed reactor and showed it to
Dr. Bhat. He found the idea of a batch-packed bed reactor more feasible and mentioned that if the size of
the packing material is small, then choking of the reactor might occur. He suggested having a cheap
solvent like hexane to regenerate the packing material as it is affordable and safe for the
environment and organisms. It would also vaporize quickly due to its high volatility. He also provided us
with a biochar sample made out of locally grown rice husk. It is produced as a waste product by the
burning of rice husks to generate energy in rice mills.
Inference:
Based on the suggestion provided by Dr. Bhat, we increased the size of the biochar raschig ring to
incorporate the viscosity, density, and particle size of the primary sludge. We also plan on using hexane
as a solvent to regenerate the packing material.
Discussion:
Our team took part in the Smart India Hackathon conducted by our University. One of our main aims in
participating in this hackathon is to get more insights from the judges regarding the hardware component
of our project. We designed a 2D model of our detector, which consisted of the Raman setup with a
photodiode. These samples will also be sent to the Raman-diode setup for detection and quantification. The
judges suggested we collect two samples to quantify TCC, one before the primary sludge enters the
bioreactor and the other after it leaves the bioreactor. For the detection and quantification of TCC, we
would require a Signal Processing Unit (SPU) that could filter the peaks corresponding to other compounds
in the wastewater treatment plant (WWTP).
Inference:
Based on the judges’ inputs, we decided to go ahead with a photo-diode based detector. Two samples would
be collected manually at the entry point and the exit point two days later to understand the
variation in the concentration of TCC.
Discussion:
After the insightful meeting with Mr. Swain on July 6, we went back to him to get his inputs on our
bioreactor design. Being an expert in the design of wastewater treatment plants (WWTP), Mr. Swain
confirmed that our proposed physical design of the bioreactor is sound. He gave us a general idea of what
materials to use to make the bioreactor, the workings of a WWTP, and the most commonly used parts
in the system. He gave us a couple of ideas on how to pick a material for the bioreactor—something that is
unreactive, cheap, and readily available. He also gave us a few sample diagrams of WWTPs that he had
designed for our reference.
Inference:
After discussing with him, we got a fair idea about the components of a WWTP and applied that knowledge to
carry out the cost analysis of our bioreactor. Hence, we decided that our bioreactor would need to be
placed after the aeration tank in the WWTP.
Discussion:
During our meeting with Dr. Mike, we raised the concern that we could not find specific plasmid vectors
for our chassis Acinetobacter baylyi. He approved of our idea of going ahead with pet22b(+) and
suggested using high amounts of cells and DNA to increase the chances of the bacteria taking up the
plasmid. Since Acinetobacter baylyi has variable transformation rates, he asked us to understand
the transformation rate of our strain. If replating is done repeatedly, the phenotype might change,
lowering the transformation rates. He advised us to always work directly with glycerol stock, avoid
plating it, and work with a single colony. He also suggested using Gibson Assembly for transformation of
our bacteria.
Inference:
The insightful discussion with Dr. McDonald helped us finalize our plasmid vector pET22b(+). Further, his
suggestions regarding the plating procedure turned out to be of utmost importance.
Discussion:
In our meeting with Dr. Sowers, we discussed the packing material in our bioreactor. We plan on using
biochar raschig rings to ensure maximum surface area. On this note, he said that
Inference:
Learning from Dr. Kevin’s experiences, we plan on using clay as a binding agent for the biochar
raschig rings, thus maintaining their structural integrity.
Discussion:
We had been referring to Dr. Krishnaiah’s NPTEL course on “Chemical Reaction Engineering” [2] to take
inspiration for our bioreactor design. It is through this course that we realized the need to pack our
biochar as raschig rings in order to increase the surface area and prevent choking. Furthermore, we wanted
to get his insights on our project in particular and hence, we requested him for a meeting. After
explaining our bioreactor model to Dr Krishnaiah, he found it feasible and gave us some suggestions. He
mentioned that a valve should be put on the sparger to prevent the backflow of fluid into the
sparger and to start the sparger before the inflow of the fluid to prevent backflow. He suggested we
opt for a fluidized bed on an industrial scale as it would have a better flow with less packing material
and provide an efficient mass transfer. Further we spoke to him about our raschig ring dimensions and the
calculations associated with them, and he approved of our idea and the calculations proposed.
Inference:
We decided to incorporate his insights regarding the sparger into our bioreactor design. Although we plan
on carrying out our experiments on a packed bed on a lab scale, we would proceed with a fluidized bed
for future industry implementation. Based on his inputs, we assumed our biochar raschig rings to be
having a Length/Diameter ratio as 1.
Discussion:
After the session by Ms. Olivia Gallup on “Computational Methods in Synthetic Biology”, we presented a
detailed overview of our project to her and engaged in a comprehensive discussion. This discussion was
vital in helping us devise a more feasible approach for controlling our genetic circuit. We
discussed the concept of gene knockout in the context of kill switches to create an auxotrophic bacteria
using a CRISPR system. This discussion helped us consider the impact of genetic modifications on our
system's functionality. A significant focus of our conversation was assessing the availability of
computational tools to evaluate the effectiveness of our proposed "kill switch." We were
particularly interested in understanding how this switch would affect our genetic components. Olivia
provided valuable information on computational tools that could be used to model the genetic circuit and
assess the impact of newly introduced genetic components.
Inference:
Based on our discussion with Ms. Olivia, we explored the idea of using a CRISPR system to create an
auxotrophic bacteria, thus, serving as a biocontainment strategy within our environmental
constraints. We further plan on looking into the computational tools mentioned by her to model the genetic
circuits.
Discussion:
The discussion with Dr. Mahesha mainly revolved around Raman spectroscopy. He suggested varying the power
of the Raman spectrometer with the same sample to observe the change in intensity of the Raman signals.
Ideally, only the intensity would undergo change. This could be used to mitigate noise in the
spectroscopic data. He emphasized that not all molecular vibrations would contribute to the Raman shifts.
He advised an intensity vs. concentration calibration graph, where intensity would be plotted on
the y-axis and concentration on the x-axis. An infrared (IR) filter to eliminate the infrared range
that may act as an interference and explore diode lasers for constructing our sensor was also suggested by
him .
Inference:
Because of the suggestions provided by Dr. Mahesha, we realized that varying the power of the spectrometer
with the same sample to reduce noise and creating an intensity vs. concentration calibration graph would
make our data more accurate and reliable. Using an IR filter and diode lasers would further ensure
the precision of our sensor.
Surveys
1. Analyzing and understanding scientific awareness without the bias of age and
profession:
This survey aimed to gather information about public perceptions and knowledge of products
in personal care products, wastewater management systems and general ideas of the public in synthetic biology and
related topics.
We gained multiple insights from these surveys which we have incorporated into our education strategies as well.
Attached below is a PDF showing a detailed interpretation of our survey responses:
Analyzing challenges faced by iGEM teams in contacting stakeholders :
This study aimed to gather information about different ethical and legislation challenges
faced by iGEM teams. The purpose of this survey is to understand the challenges that the participants face
regarding these topics.
Disclaimer: This is an initiative that we have started. However we have not received enough responses thus the
inferences are not conclusive enough.
This form will remain open to be filled by other teams for a year:
https://forms.gle/oEyxtCFRfbti1j9y5
Here is a consolidation of our interpretations from the survey:
How our discussions lead to the Final Implementation
Proposed Implementation
With the use of a modified Acinetobacter baylyi strain, we have proposed a packed
bed bioreactor in our study to effectively break down the toxic chemical triclocarban (TCC) into non-toxic
molecules. This strain has undergone genetic modification to express the tccA gene, which produces the TccA
amidase enzyme that converts TCC to 4-chloroaniline and 3,4-dichloroaniline. The natural metabolic pathway of
Acinetobacter baylyi has also been utilized to transform these chloroaniline daughter compounds into
cis-muconic acid, a secure end product that may be included into the bacterial energy supply by taking part in the
TCA metabolic cycle.
Bioreactor Design:
Our bioreactor design, as discussed previously, incorporates a packed bed configuration that facilitates effective
contact between fluids and solids. This design remains instrumental in ensuring efficient TCC degradation.
Choice of Packing Material:
We continue to utilize the locally sourced biochar from rice husks, in line with Dr. Bhat's recommendation, as an
ideal packing material that provides both adsorption properties and a nutrient-rich environment for the modified
Acinetobacter baylyi strain.
Environmental Considerations:
Incorporating control samples into our growth curve experiments, as suggested by Dr. Shetty, ensures data
reliability and environmental safety, especially considering the by-products of TCC degradation.
Novel Biodegradation Pathway:
Dr. Ramananthan's inputs on a novel biodegradation pathway for TCC play a pivotal role in our project's success,
shifting our initial idea of enzyme efficiency enhancement to an idea that was more feasible in our given timeline
and resources.
Choice of Microbe:
Mr. Sotiris' recommendation to employ multiple enzymes for complete TCC degradation complements our bacterial
strain's capabilities.
Application in Sludge Treatment Plants (STPs):
Mr. S.K. Swain's guidance on implementing our solution in STPs remains a key aspect, considering the higher TCC
concentration in sludge.
Regeneration of Biochar:
Varying the power of the spectrometer, creating an intensity-concentration calibration graph, and using hexane for
biochar regeneration, as per Dr. Mahesha MG and Dr. Bhat's recommendations enhance our project's accuracy and
sustainability.
Future Implementation:
Our future plans, as guided by Dr. Kevin, to use clay or lignin as a binding agent for the biochar Raschig rings
further strengthen the integrity of our packing material.
Advanced Monitoring with LCMS:
The discussion with Dr. George to weigh the pros and cons of all the TCC quantification ideas and realizing that
the use of LCMS for compound quantification is the most efficient method enhances our project's analytical
capabilities.
Fluidized Bed Bioreactor:
Dr. Krishnaiah's insights on fluidized bed bioreactors (for future implementation) will aid our project's
scalability and efficiency.
Bioreactor Placement:
S.K. Swain's guidance on bioreactor placement after the aeration tank in WWTPs is essential for optimal
performance.
Mathematical Modeling Simplification:
Dr. Murty's assurance that fouling can be ignored at the lab scale simplifies our mathematical modeling
efforts.
By integrating these additional scientific insights into our project implementation, we hope to ensure a
comprehensive approach to efficient TCC degradation while prioritizing environmental responsibility.
To know further details about our implementation, click here.
References:
Samaga, P. (2021, January 29). Toxic cocktail of chemicals discharged into Indrani River making life miserable for
locals. The New Indian Express. https://www.newindianexpress.com/states/karnataka/2021/jan/29/toxic-cocktail-of-chemicals-discharged-into-indrani-river-making-life-miserable-for-locals-2256670.html
YouTube. (n.d.). Chemical Reaction Engineering 2 (Heterogeneous Reactors). YouTube. Retrieved September 15, 2023,
from https://youtube.com/playlist?list=PLbMVogVj5nJRrrhcrAIIJs1W0qgH5axqO&si=491sP3j3CP_Kzyg-.