A study on the efficiency of aerated lagoon process to treat wastewater
Md. Gulam Kibria, Md. Delwar Hossain
Abstract
With increasing urbanization and industrial development there is an increase in the production of wastes. These wastes, if not properly managed can have detrimental effect on the environmental quality. Under the growing demand of water in Dhaka city for daily needs and considering the constraints in disposal of wastewater, wastewater can be recycled and can be used as a major source of water supply for the growing population of Dhaka, the capital city of Bangladesh, if it can be properly treated. The study area includes a huge amount of wastewater both industrial and domestic wastewater from Tejgaon industrial area and its surrounding areas which are disposed to Hatirjheel canal. Hence an extensive study was carried out to evaluate the effectiveness of aerated lagoon process to treat the sewage diverted from Tejgaon industrial area to hatirjheel canal. Lagoon-based wastewater treatment is popular because of their simplicity and cost effectiveness. The study involved collection of extensive water samples for test, analysis of the sample for selected water quality parameters that include Color, NH3-N, Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD). The study finds final reduction of 15% in Color, 93% in BOD5, 71% in COD, 29% in NH3-N.The study result shows that the aerated lagoon is effective in reduction of COD and BOD5 in a significant percentage.
Keywords: Wastewater, aerated lagoon, recycle, industrial area, water quality.