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Environment (Protection) Second Amendment Rules, 2025
The Environment (Protection) Second Amendment Rules, 2025 mandate caustic soda plants using Membrane Cell Technology (MCT) to pass a fish-survival test for wastewater toxicity during laboratory-based bioassay testing. The rules specify bioassay testing as the method to measure combined wastewater toxicity for such plants.
Environment (Protection) Second Amendment Rules, 2025:
| Dimension | Key Details |
|---|---|
| Applicability | Applies to caustic soda plants using Membrane Cell Technology (MCT) for the requirement of wastewater toxicity testing. |
| Mandated test | Mandates a fish-survival test for wastewater toxicity during laboratory-based bioassay testing. |
| Bioassay testing | Provides for measuring the combined toxicity of wastewater. |
| Membrane Cell Technology | Comprises a special membrane to control the chemical process, and provides for a less polluting process than older mercury-based processes. |
| Caustic soda | Comprises sodium hydroxide as its chemical name, and comprises one of India’s most widely used industrial chemicals. |
| Industrial uses of caustic soda | Comprises uses in industries such as soap, detergents, paper, textiles, aluminium, petrochemicals, and water purification. |