Abstract

The composition of municipal wastewaters discharging to surface waters varies enormously. The wastewater from a municipality can be identified as waste that includes domestic and non-hazardous waste. In municipal wastewater treatment, high concentrations of chemical oxygen demand (COD) and ammonia-N produced in the effluent can cause direct danger or hazard to people's health and welfare if not treated or managed well. A good treatment is required to reduce COD and ammonia-N concentrations in municipal wastewater. Therefore, this study aims to determine the optimum conditions influencing the biological processes of municipal wastewater by using acclimatized mixed culture (AMC). In this study, biological treatment was used to remove COD and ammonia-N from municipal wastewater. The experiments were designed according to a central composite design with agitation speed (50 to 150 rpm) and retention time (4 to 6 days) as variables, following the Response Surface Methodology (RSM). The optimum processing conditions for COD and ammonia-N removal were obtained at 150 rpm agitation speed and 5 days of retention time. The percentage removal of COD and ammonia-N obtained at this condition was 70.41% and 64.29%, respectively. Hence, it can be presumed that municipal wastewater plants can be treated biologically with AMC.

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