Affiliations: Tamil Nadu Water Supply and Drainage Board, Chennai,
India | Alternate Hydro Energy Center, IIT, Roorkee,
India | Department of Civil Engineering, IIT, Roorkee,
India
Abstract: Various types of sewage treatment technologies are available for the
treatment and reuse of sewage in India. It is difficult to select an
appropriate treatment technology for the specific region such as rural, urban
or metropolitan area. Suitability to techno economic analysis, life cycle, cost
analysis, and benefit cost ratio can be used as financial management tool to
take final decision. This paper highlights the application of techno-economic
analysis for the selection of appropriate technology of sewage treatment for
Kancheepuram town of Tamil Nadu. Out of five different types of sewage
treatment technologies that are being used in India, the waste stabilization
pond has been found to be the most economical option to treat sewage as the
cost of land in Kancheepuram city is less than Rs. 6.5 million per ha (i.e.,
Rs. 650/sqm). Between Rs. 6.5 and Rs. 13.0 million per ha, the Upflow Anaerobic
Sludge Blanket (UASB) with Final Polishing Pond (FPP) is economical. Above Rs.
13.0 million per ha, the Moving Bed Biological Reactor (MBBR), Sequencing Batch
Reactor (SBR) and Activated Sludge Process are found to be economical. The
selection of technology has been done by calculating the benefit cost ratio,
assuming a discount rate of 10%.
