Soil Biotechnology based wastewater treatment system at AAETI, Nimli

Location: AAETI, Nimli
Scale: Institute
Implementing organisation: CSE, New Delhi and Vision Earthcare
Designed Capacity: 20 KLD
Area : 140 m2
Operational since :2017
Capital cost : Rs. 10 Lakhs
O&M: Rs. 1-1.8 Lakhs (including labor and energy cost)
The Anil Agarwal Environmental Training Institute (AAETI), a fully residential institute for training and capacity building located in Nimli village, Tijara block, Alwar District in Rajasthan, is neither connected to municipal water supply nor to sewerage network. It treats wastewater coming from cafeteria, hostels and quarters of support staff through a soil Biotechnology (SBT) based wastewater treatment system. The treated wastewater is reused in toilets for flushing; this in turn reduces the dependence on ground water.
Wastewater management for the three buildings consists of a raw water collection tank, two bioreactor beds, collection tank (CT1) and treated wastewater collection tank (CT2), pumping and conveyance system. The wastewater generated from kitchen has an additional unit i.e. oil and grease trap that arrests oil before it enters treatment so that the treatment is efficient through natural microbial degradation. Thereafter the wastewater from cafeteria, hostel block and support staff housing enters the raw water collection tank. Through a pumping and piping system, raw water is sprinkled over the bioreactor bed (BR-1). The bioreactor bed consists of crushed stones, jute bags, crushed bricks with media that supports microbial growth. This bioreactor bed can be planted for aesthetics. The water is collected in collection tank (CT-1) from where it is sent to the second bioreactor (BR-2) for further treatment (if required – varies with the quality of inlet and reuse). As the wastewater passes through various layers of the bioreactor, it undergoes a series of natural biochemical reactions which break down the contaminants present. The treated water is collected in a tank and then pumped to overhead tank for use in flush toilets.
The system is expected to provide treated water that would be used for flushing purposes in toilets. The system will generate about 20,000 litres per day of treated water that would be pumped to the overhead tank for ready availability for toilet flushing. Water quality report at the inlet and outlet of the SBT will be furnished in due course.

Vision Earthcare,



Water Programme
Centre for Science and Environment