Polythene is exceedingly harmful to the environment and living organisms because of its incredibly slow rate of breakdown. The biological method of polythene degradation has arisen as an eco-beneficial solution to the global problem of plastic pollution, as the conventional methods of polythene degradation, including as incineration, land filling, and chemical treatment, have proven to be detrimental for the environment. In addition to being economical, biological deterioration is environmentally benign. Various microbes like fungi, algae and bacteria have been tested for degradation of polythene in natural niche, with lesser work on microalgae. This research work is being carried out with the objective to assess the degradation of polythene with microalgae application. Ten different algal species were isolated and identified from algal growth on polythene bags, collected from the three different water waste sites in Kota, India. The isolated algal strains were grown and cultured in BG-11 broth before being assessed for their capabilities to biologically degrade biodegradable polythene, low density polythene (LDPE) and high density polythene (HDPE) sheets. The polythene sheets were treated with the algal isolates and incubated for a month before being assessed for degradation. These biologically treated samples were later analyzed for weight loss. Further investigations were also performed through FTIR and SEM to analyze the changes in morphological and chemical characteristics of the biodegradable polythene samples. Bestowing to SEM micrographs, microalgae could adhere and colonize plastics resulting in its phycodegradation. This hitherto reports that among the isolated algae only Oocystis solitaria, Phormidium tenue and Scenedesmus carinatus possessed the high capabilities to degrade the polyethylene samples.
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