Unconventional Waste Water Treatment
Assi Nala, Varanasi
Treatment of wastewater in nalas outfalling into rivers can reduce pollution in rivers. INTACH carried out a pilot project using bioremediation treatment and cleaned Assi Nala falling into Ganga river at Varanasi.
On-Channel Treatment of Polluted water flow in Palam Drain
The project demonstrates treatment of flowing wastewater, utilizing bioremediation techniques of bacteria consortium, daphnia zooplankton, pisciculture and aquatic root zone treatment. The water quality has improved and foul odor is reduced at much lower cost than any conventional treatment. The 4 km stretch is also being vegetated as an ecological corridor.
- East Taj Drain : Crosses the eastern entry to Taj. INTACH put in sandbag weirs and bacteria dozing to successfully remove foul odour and reduce the pollution load at the river outfall from 70 mg/l BoD to <40 mg/l BoD.
- Circuit House Lake : This foul smelling lake forms part of the Golf Course. In situ bioremediation techniques were utilized for improving water quality in the Lake.
- Mantola Nala : This drain crosses the entry to the Red Fort. It carries 14 MLD of polluted water with a BoD level of 160 mg/l. With bio-remedial measures the BoD level have been brought down to <50 mg/l
Water Harvesting On Central Ridge Stream (NDMC, Delhi)
Water harvesting and recycling has been proposed on a 3 km. stretch of the Central Ridge Stream (Kushak Nala). This involved re-sectioning and modifying the stream bed, assessing the rainfall characteristics in the catchment and runoff characteristics, upgrading the waste water inflow to surface drainage standards through bacteriological inputs, creating weirs at several locations and landscaping of the stream banks as a public space.