Okhla Phase II Sewage Treatment Plant, Delhi, India

Okhla Phase II is a sewage treatment plant located in the Okhla area of South East Delhi, India. It serves a population of approximately 360,785, classifying it as a large-scale municipal facility within the Delhi urban agglomeration. The plant is operational and plays a key role in managing wastewater from the densely populated capital region. As a large agglomeration, the plant is expected to meet secondary treatment standards under India's Central Pollution Control Board (CPCB) guidelines, which mandate treatment before discharge into water bodies. Facilities of this scale typically incorporate biological treatment stages to reduce organic load and suspended solids. The treated effluent from Okhla Phase II likely discharges into the Yamuna River, a major tributary of the Ganges, which flows through Delhi and downstream to the Bay of Bengal. The Yamuna is ecologically significant, supporting diverse aquatic life and providing water for irrigation and drinking. Proper treatment is critical to prevent pollution and protect downstream ecosystems.

The plant's treated effluent likely enters the Yamuna River, which flows through Delhi and joins the Ganges before reaching the Bay of Bengal. The Yamuna is a vital water source but faces significant pollution pressures from urban and industrial discharges. Downstream, the Ganges delta supports rich biodiversity and is an important migratory corridor for aquatic species. Effective wastewater treatment at Okhla Phase II helps reduce nutrient and pathogen loads, contributing to the ecological health of these river systems.