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The present study has been undertaken to evaluate the performance of wastewater treatment systems (WWTS) in three different districts (Kolkata, Central Public Health and Environmental Engineering Organization (CPHEEO) has published Manual on Sewerage and Sewage Treatment (1993 edition), Manual onhas been a consistent demand from the Engineers in the profession for a Manual on Sewerage and Sewage treatment. The Manual on Water Supply and Treat-. The first Manual on Sewerage and Sewage Treatment was published by the and 25th September, 1993 organised by the Ministry of Urban Development and Manual Scavenging Act 1993. Refresher Courses Conducted by CPHEEO. Asset Management for Sewage Treatment Plant and Pumping Station.