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LG visits Neela Hauz- appreciates DDA for developing this exemplary model of urban rejuvenation.

Saturday, September 10, 2022

* LG visits Neela Hauz- appreciates DDA for developing this exemplary model of urban rejuvenation. 

* LG directs officials to explore the possibility of developing similar Constructed Wetland Systems for natural treatment of sewage water over other major drains in the City.

The Lt Governor, Shri VK Saxena today visited the Neela Hauz Bio-diversity park developed by the Delhi Development Authority (DDA) in South Delhi. Walking through the scenic "Constructed Wetland System (CWS)", the LG described it as an exemplary model of urban rejuvenation and appreciated the DDA for developing and maintaining the park.

Upon witnessing the natural water treating system that includes in-situ remediation of sewage water through two oxidation/stabilization ponds, filtration zone and aquatic plants without using any power, and the quality of treated water thereof, Shri Saxena instructed officials to explore the possibility of developing such systems over other major drains in the City. 

Neela Hauz Biodiversity Park has been developed as the Neela Hauz Lake, which is a natural waterbody and used to supply drinking water to South Delhi, is nearly extinct or dead due to urbanization and construction of Aruna Asif Ali road bridge across the lake by PWD.
The Lake has been restored to its pristine glory through: (i) desiltation and excavation of solid waste dumps; (ii) in-situ biological remediation of 1 MLD of raw sewage – the only source of water to the lake; (ii) use of desilted and excavated material for making embankment and (iv) development of vegetation on the embankment to maintain the water quality.
The novelty of Neela Hauz Biodiversity Park is the development of integrated Constructed Wetland System (CWS) – a nature based solution for in-situ remediation of raw sewage – and use of treated water for restoration of the lake, which was a nearly extinct lake. The CWS design works on the same principle as that of STP without energy. The CWS design has two oxidation/stabilization ponds, a filtration zone, constructed Wetland with aquatic plants and natural wetland.

The integrated wetlands make 1 MLD of raw sewage into clean water which has the same quality as that of river water and all the water quality parameters (dissolved oxygen, pH, total suspended solids, total dissolved solids, Biological oxygen demand, chemical oxygen demands, ammonia, nitrogen and phosphates) are lower than the permissible limits prescribed by CPCB. The removal percent efficiency of CWS for some water quality parameters like COD is more than 15% and the DO level is enhanced from 0.0 to 7.5 mg (L).

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