Where are largest sewage treatment plant in India?
The Delhi government is building India's largest sewage treatment plant (STP) in Okhla subdivision of Delhi, capable of treating 564 million litres of wastewater per day. The STP, which covers an area of ??110 hectares, is expected to be completed by the end of 2022.
When this STP is completed, the main wastewater flowing into the Yamuna River will be treated. This treated water will be used to rejuvenate groundwater and the rest will be discharged into the Yamuna River. It is said that effluent will be discharged into Yamuna with the latest standards for biochemical oxygen demand. (BOD) is treated at 10 mg / L and `Total Suspended Solids` (TSS) is depleted at 10 mg / L.
The treated water can be used for a variety of non-drinking purposes such as gardening, lake rejuvenation, washing, flushing, etc. This STP is designed to receive wastewater from various drainage channels and sewer networks in southern and central Delhi. With state-of-the-art systems, this STP is equipped with state-of-the-art technology.
The plant has a sun drying system that processes approximately 150 tonnes of sludge and covers 12 hectares. When this STP is completed, the large-scale outflow to the Yamuna River will be stopped. The treated water from this treatment plant is used for a variety of purposes.Water bodies and surplus water are being diverted to the Yamuna River to recharge the groundwater in and around the Asola Bhatti mine and to rejuvenate the lake,
In addition, the two existing STPs, 72MLD and 136MLD, will continue to work with the Okhla subdivision of Delhi STP complex. This brings the total processing power of the Okhla subdivision of Delhi STP Complex to 771MLD.
Of these, 136 MLDs have already achieved advanced parameters of biochemical oxygen demand (BOD) and total suspended solids (TSS) of less than 10 mg / L.
Another second largest STP in construction:
Tirupati Municipal Corporation (MCT) recently embarked on an environmentally friendly project. It is a natural sewage treatment plant (STP) with 5 million litres (MLD) per day. It is the second largest in the country after 3MLD Natural STP in Delhi. Recycling and reuse of treated wastewater is a proposed alternative to bridge the gap between water supply and demand and reduce pressure on water resources.
According to reports,nearly 80% of the water supplied to households is discharged as wastewater, which is untreated and is a potential groundwater pollutant. At Tirupati, only 30-40 percent of wastewater is currently recycled. The MCT is working on a new 25MLD sized traditional STP, but the indifference to this facility is that it requires a large network of infrastructure and high costs.
Citizens are not relying solely on these STPs, but envisioning unconventional STPs that can naturally treat wastewater with less maintenance and minimal cost.
Natural STP provides sustainable results because system maintenance is very easy and inexpensive. Natural STP consists of a septic tank that leaves wastewater for a long time to settle all suspended solids. The water then passes through chambers with pebble beds of various sizes that filter the wastewater. At least four fast-growing aquatic plants feed on organic matter in the water.
