Characterization, treatment and disposal of sewage of Dhaka city

Abstract

This study investigates the characteristic quality of sewage of Dhaka city. The variation in physical, chemical .and biological characteristics as well as the flow rate of sewage with time and also the seasonal effect both in volume and characteristics are atudied and an attempt is also made to investigate the most .effective method of sewage treatment. This study attempts to determine the effect of discharging partially treated or untreated wastewater on the quality of water of the Buriganga river. The pollution load and self-purification process of the river are also discussed in this study. Considering the established characteristics of sewage, climatic and meteriological factors, number of people utilizing present sewerage facilities and other social-economic factors some alternative methods of sewage treatment are studied in details. An attempt is made to select the most: appropriate method of sewage treatment for Dhaka city based on both engineering and economic analysis. A detail study and survey on the existing sewerage system is done and some present and future problems with the existing sewerage system are identified. The remedial measures of such problems are also investigated and discussed in this study.