Simulation Models for the dispersion of sewage outfalls along the west coast of Mumbai, India

摘要

The island city of Mumbai with an area of 438 sq. kms and supporting a population of over 10 million generates about 2700 million liters per day (mld) of sewage from the seven service areas of the city sewerage network and discharges it into the adjoining west coast and the two creeks in the Arabian Sea. This has resulted in the degradation of coastal water quality, contamination of the adjoining beaches and seafronts. The Municipal Corporation of Greater Mumbai has therefore, undertaken the task of delineating appropriate sewage disposal system to achieve cleaner marine ecosystem through marine outfalls at specific locations. This paper presents the results of the mathematical simulations on the impacts of discharge vis-a-vis the length of the outfall and level of land treatment. The results of the simulation indicate the level of bacterial pollution to be higher near the diffuser locations as compared to near-shore regions. 48 hrs simulation result analysis shows that FC counts near the diffuser location will be in the range of 2000-8000 counts per 100 ml.