TOKYO ENGINEERING CONSULTANTS
Case study of wastewater treatment plants (2003-04)
Under the JICA supported ‘Ganga water quality management plan study’ the Foundation carried out a case study of over 25 sewage treatment plants which have been constructed during last 10-15 years under the Ganga and Yamuna Action Plans. The assignment involved technology assessment (9 different conventional and advanced technologies) with regard to their effectiveness treatment efficiency, life cycle costs, energy and land requirements, etc. and identification of suitable options. As against a heavy focus on UASB technology in the past, the assignment recommended switch over to conventional systems which are time tested, robust and reliable. The assignment also covered assessment of five different technology options for wastewater disinfection; and the ‘low cost’ sanitation component implemented for the low income communities and suggested effective alternate models involving a mix of community and individual household facilities supported by small bore sewerage system. In addition, the study also assessed the institutional aspects of treatment plants and on-site sanitation which apparently were not addressed during the implementation phase of the project and as a result led to underperformance of the facilities.