Ganga, the life source of Northern and Eastern India is a prominent area of study by researchers from diverse disciplines, a key among them is the environment. In 2019, the National Geographic Society organized the expedition “Sea to Source: Ganges” to scientifically document plastic waste in the Ganges watershed and support holistic and inclusive solutions. A proud partner in this women scientists-led expedition was IIT Kharagpur along with the Isabela Foundation, University of Dhaka, the Wildlife Institute of India, and Wild Team Bangladesh.
Researchers and students from an environment-focused group at the Dept. of Civil Engineering, IIT Kharagpur participated in this transboundary expedition. The group was involved in estimating the mismanaged plastic quantities from municipal solid waste all along the river in India and come up with potential solutions and improvements in waste management systems to avoid the leakages of plastic waste from land to the river.
Talking about their role in the study-based expedition, Prof. Brajesh Dubey who heads this group at IIT Kharagpur said, “We carried out the waste characterization from the city/town dumpsite waste samples, as well as the samples collected along the river from Rishikesh to Howrah. It helped in estimating the extent of mismanaged plastics in the waste, the type of plastics present in the waste and the estimation of the fraction of mismanaged waste plastics getting into the river Ganga. A model is also being developed using the field data to have a realistic estimation of the plastic pollution transport from land to river and eventually to the ocean.”
The IIT research group also performed a photographic survey of waste management practices and issues for each city/town. Further, they held and discussions with city officials on waste management plans, identification of infrastructure gaps for the city/town and suggestions for improvement in the implementation of the solutions for better plastic waste management. The solutions proposed include the proper waste collection in segregation mode, capacity building in terms of infrastructure development as well as skill improvement of manpower involved in waste management practices at ULB levels. The research group is in touch with several ULBs for the improvement of their waste management infrastructure.
While the expedition was carried out from May to December 2019, the study was carried out till February 2021. The report has been recently made public by the National Geographic Society on their blog. Read More
Photo by Sara Hylton.
Talking about the findings, she further added, “Our study shows that cellulose nanocrystals derived from cucumber peels possess modifiable properties due to the presence of abundant hydroxyl groups, which resulted in better biodegradability and biocompatibility. These nanocellulose materials emerged as strong, renewable and economic material of the near future, due to unique properties like a high surface area to volume ratio, light in weight, and excellent mechanical properties. Thereby, such nanocrystals, when reinforced as nano-fillers in bio-composites films, can produce effective food packaging materials with low oxygen permeabilities.”
Research scholar N. Sai Prasanna said, “The crystallinity percentage as high as 74.1 % along with thermal stability of more than 200 °C negative zeta potential values (< -30 mV), and acid hydrolysis yield of 65.55%, make the material a strong nano-filler reinforcement as bio-nano composite. This offers the much needed mechanical, barrier, optical, rheological properties, nontoxicity, etc. required for food packaging materials which has the strong market potential to replace plastic.”
Paper cups are usually lined by a thin layer of hydrophobic film which is made of mostly plastic (polyethylene) and sometimes co-polymers to hold the liquid in the paper cup. Within 15 minutes this microplastic layer degrades as a reaction to hot water, says the first of its kind study conducted in India by Dr. Sudha Goel, Associate Professor at the Dept. of Civil Engineering and research scholars Ved Prakash Ranjan and Anuja Joseph studying Environmental Engineering and Management. 
The researchers followed two different procedures – in the first process, hot ultrapure (MilliQ) water (85–90 ◦C; pH~6.9) was poured into the disposable paper cups, and it was allowed to sit for 15 mins. The homogeneously mixed water was then analyzed for the presence of microplastics as well as additional ions that may have leached into the liquid from the paper cups. In the second process, paper cups were initially dipped in lukewarm (30–40 °C) MilliQ water (pH~6.9). Thereafter the hydrophobic film was carefully separated from the paper layer and exposed to hot MilliQ water (85–90 °C; pH~6.9) for 15 mins. and Changes in the physical, chemical, and mechanical properties of the plastic films were examined before and after exposure to hot water.
Explaining the exposure of 15 minutes, Prof. Goel linked its basis to a survey wherein the respondents confirmed consuming their beverage within 15 mins of obtaining it. 
The samples of paper cups were collected from popular stores across Kharagpur, West Bengal. “Our study indicates most plastic layers lining the paper cups were of HDPE (High-density polyethylene) grade, whereas only very few paper cups were lined with a copolymer of cellulose. However, the release of microplastics into the hot water was consistent in all samples irrespective of their grades,” remarked researcher Ved Prakash Ranjan. 
“Our hypothesis on the degradation of the plastic layer after exposure to hot water was confirmed through images obtained from the atomic force and scanning electron microscopy. Also, another study on the mechanical properties of the plastic film proved its deformation upon exposure to heat,” explained researcher Anuja Joseph.
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“Segregation of waste is one issue and another is disposing of off the waste, reusing it. We hope these brilliant young minds would be able to come up with some innovations for urban Indians who are creating massive plastic waste which is causing problem for both urban and rural ecosystems,” said Barnali Chakrabarti, an environmental evangelist and the first lady of the campus.
“There are about 30 students’ societies in the campus at present who are engaged in socio-cultural, sports, co-curricular, activities. “Vision Prabaho”, however, will be a unique society, not just in IIT KGP, but across all IITs, considering the fact that our campus is a mini-township and is witnessing challenges quite similar to urban areas though at a smaller scale though fortunately, we have a huge cover of greenery,” said Prof. William Mohanty, President, Technology Students’ Gymkhana at IIT KGP.
