| Summary: | The East Kolkata Wetlands (EKW), a robust yet fragile ecosystem, faces persistent ecological stress from the uncontrolled proliferation of the notoriously invasive water hyacinth (WH). In this study, we investigate a valorization pathway of converting waste into biochar through controlled pyrolysis, thereby transforming it into a product of both ecological and economic value. Freshly harvested hyacinth has a high moisture content (85–95%), but once dried, the biomass can be pyrolyzed to yield stable biochar. In our initial trials, WH harvested from two sites in the EKW yielded 9.7–13.1 g dry weight (on a 15% moisture basis), producing 0.93–2.80 g of biochar per 100 g of fresh biomass.
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