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Bio-Enzymes Banned for Rivers: CPCB Cites Eco-Risks
8 Apr
Summary
- CPCB advises against bio-enzymes for natural water bodies due to ecological concerns.
- NGT initiated case following report on unauthorized chemical use in Pune.
- Long-term impact and scientific validation for river use remain unclear.
The Central Pollution Control Board (CPCB) officially submitted findings to the National Green Tribunal (NGT) on April 2, recommending against the use of bio-enzymes for treating natural water bodies. Concerns primarily revolve around potential ecological impacts and insufficient scientific validation for their application in rivers, streams, and lakes.
This directive originated from a suo moto case initiated by the NGT, prompted by a February 23, 2024, Hindustan Times report. The report detailed the Pune Municipal Corporation's (PMC) use of bio-enzymes and insecticides in rivers without proper approvals, with the PMC stating a trial use of Draynzyme for water hyacinth and pollution control.
While the PMC cited a case study for Draynzyme, the CPCB noted a lack of comprehensive scientific data concerning long-term effects, dosage, and behaviour in complex aquatic ecosystems. Although short-term toxicity tests indicated no immediate harm to aquatic life, experts emphasized the absence of assessment for long-term risks like bioaccumulation.
Consequently, the CPCB concluded that Draynzyme is not recommended for river cleaning or lake restoration. Limited use in sewage drains or stagnant wastewater channels may be considered under controlled conditions with strict monitoring.
