Which is the largest STP in Delhi?

Delhi needs strong STP plants to keep the Yamuna and the city clean. A large sewage treatment plant can make a big difference in the quality of water and public health. We will explain which sewage treatment plant in Delhi holds the record for size. We will also see why size matters and how modern features help reuse water and reduce pollution.

Okhla Sewage Treatment Plant: The largest STP in Delhi

Okhla STP is the largest sewage treatment plant in Delhi and one of the largest in Asia. The plant came after years of planning and upgrades that replaced older, smaller units with a single large facility. The scale of this plant changes how Delhi will handle urban sewage and how the Yamuna will receive cleaner water downstream.

Let us have a look at some core facts about the Okhla

The Okhla plant treats 124 MGD of sewage, which equals 564 MLD. This capacity makes it larger than previous major plants in the city and places it among the largest single-stage plants in Asia. The plant sits on a wide site that was once split into smaller units. By bringing these units together, the Delhi Jal Board created a single treatment line that can handle large peak flows. Officials say the plant will help reduce raw sewage that reaches the Yamuna and will supply treated water for uses such as irrigation and industry. These changes will improve river health and also free municipal water for other city needs.

Key Specifications of the Okhla STP

Let us see the technical specifications to understand why the plant is important for city planning and for future reuse projects.

1. Treatment Capacity and Scale

The Okhla plant has a treatment capacity of 124 MGD, which equals 564 MLD. This level of capacity lets the plant treat sewage from many parts of South, Central, and Old Delhi. The design aims to keep effluent standards low for BOD and solids so that treated water meets the required quality for reuse. By operating at a large scale, the plant reduces the need for many small units and improves process control and monitoring. This makes maintenance simpler and cuts the per-unit cost of treatment, which helps the city save public funds over time.

2. Location, Coverage, and Cost

The plant spreads over 40 acres in Okhla and serves about 40 lakh, or 4 million, residents in nearby zones. The project came under the Yamuna Action Plan and cost about ₹1,161 crore. The funding and the partnerships allowed the Delhi Jal Board to adopt modern systems and to replace older structures on the same site. These investments aim to protect the river and to provide a steady flow of treated water for non-potable uses. The economy of scale lets the plant support irrigation uses and industrial needs, which eases pressure on drinking water sources.

Advanced Features

Let us have a look at some notable advanced features that improve performance and sustainability. The plant uses sludge digestion to capture biogas and to convert waste into green power. The biogas-to-power system can generate about 5 MW of electricity, which covers a large share of the plant’s energy needs. This approach cuts the plant’s carbon output and lowers running costs. The plant also uses UV disinfection, which gives higher control over pathogens and helps the treated water meet reuse standards for irrigation and industrial processes. By producing safe Class A sludge, the plant creates a product that farmers can use as manure. This approach closes the resource loop and turns waste into a useful product.

Water Quality and By-products

The plant targets strict limits for biological oxygen demand and suspended solids so that discharged water harms the river less. The treatment lines include advanced tertiary steps to reduce nutrients and to meet reuse standards. The plant also aims to recover water for urban use, which reduces demand on fresh sources. The Class A biosolids meet sanitization standards so they can return to agriculture as a soil amendment. These by-products make the project more sustainable and more useful for the local economy.

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Conclusion

Okhla holds the title as the largest sewage treatment plant in Delhi and one of the largest single-stage plants in Asia. The plant shows how scale and modern features can reduce pollution and support reuse. A strong sewage treatment plant manufacturer makes such outcomes possible by offering design quality and service. If you seek more details or wish to discuss a custom solution, Netsol Water can help. Contact us for a consultation and to learn how modern systems can meet your city or industry needs.

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Phone: +91-9650608473

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