Nilothi IV Wastewater Treatment Plant, West Delhi, India

Nilothi IV is a major wastewater treatment plant located in the Punjabi Bagh Tehsil of West Delhi, India. Serving a population of over 1.2 million, it is one of the key facilities supporting the capital's extensive sanitation infrastructure. The plant is operational and contributes to the treatment of domestic wastewater from a densely populated urban area. As a large agglomeration serving more than 100,000 people, Nilothi IV operates under India's environmental regulations, which mandate appropriate treatment levels to protect water quality. The Central Pollution Control Board (CPCB) and Delhi Pollution Control Committee (DPCC) oversee compliance with discharge standards. For plants of this scale, secondary treatment is typically required, with provisions for nutrient removal in sensitive areas. The treated effluent from Nilothi IV is discharged into the Yamuna River system, which flows through Delhi and eventually joins the Ganges. The Yamuna is a vital water source but faces significant pollution challenges. The plant's operation is crucial for reducing the organic and nutrient load entering the river, thereby supporting downstream aquatic life and water quality for communities.

Nilothi IV discharges into the Yamuna River, a major tributary of the Ganges. The Yamuna flows through Delhi and downstream into Uttar Pradesh, where it supports irrigation, drinking water, and diverse aquatic ecosystems. The river is ecologically sensitive due to high pollution loads from urban and industrial sources. Effective wastewater treatment at Nilothi IV helps mitigate eutrophication and oxygen depletion, protecting fish populations and biodiversity in the lower reaches.