Decentralised wastewater treatment system at Aravind Eye Hospital, Pondicherry


Location: Abhishekapakkam, Thavalakuppam Junction, Pondicherry Scale: Institutional Implementing organisation: CDD Society, Bangalore	Designed Capacity: 320 KLD Area : 2690 sq. m Operational since : 2003 Capital cost : 1.12 crore O&M: 2.5-3 Lakhs per year



The treatment facility receives 270 - 300 KLD) from hospital building that includes only domestic sewage. DEWATS was adopted to meet the demand of huge water requirement for horticulture and maintaining the lush green area of 15 acres within the hospital premises.



The grey water and the black water generated in the hospital premises first enter into separate two chambered settlers. The settlers for black water treatment are integrated with the anaerobic baffled reactors. The partially treated black water then undergoes secondary anaerobic treatment through baffled reactors. The black water and grey water is collectively passed through anaerobic filter and then to the series of horizontal gravel filters planted with Canna indica . Final treatment is done through polishing ponds where the water is stored also for further reuse.



BOD reduction: 98% COD reduction: 96% TDS reduction: 96% (Source: CDD Society, Bangalore)



Consortium of DEWATS Dissemination (CDD)Society 621, 5th Main Road, OMBR Layout Banaswadi Post, Bangalore 560 043. Email: bangalore@cddindia.org dbns.tech@cddindia.org

P. Kanagaraj Manager General Aravind Eye Hospital Cuddalore Main Road Thavalakuppam, Pondicherry 605007 email: kanagaraj@pondy.aravind.org