Mumbai generates one of the highest volumes of wastewater in India due to its population density and urban scale. Existing treatment capacity was insufficient to meet growing demand and to protect the coastal environment. The project was undertaken to significantly enhance treatment capacity and improve the quality of treated effluent. The programme comprised multiple large wastewater treatment facilities designed to collectively handle very high daily flows. Treatment systems were planned to achieve consistent performance, enable reuse of treated water for non potable applications and reduce environmental impact through effective sludge management. Severe land constraints required compact and space efficient plant configurations with multi level arrangements so that operational flexibility and long term maintainability could be achieved within dense urban settings.

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