Panalee Chevakidagarn, Udomphon Puetpaiboon, and Wanrudee Wanseng

pp. 871 - 876

Abstract

The aim of this experiment was to upgrade the operation of conventional activated sludge treatment plants to save aeration energy and at the same time to provide better utilization of existing plant capacity for nutrient removal without major financial investment. In this study, pilot-scale experiments of the single stage
activated sludge process (ASP) as operated in existing ASP in southern Thailand, were investigated under conditions of simultaneous nitrification-denitrification. This first stage of the experiments was to observe the possibility of using oxidation-reduction potential (ORP) for aeration control in treatment plant fed with the wastewater from the latex rubber industry. Wastewater from the representative factory contained high carbon and solids. The F/M ratio was up to 1.5 kg of COD/day/kg of MLSS. The results proved that the ORP was greatly affected by the change in air supply. However, it was also affected by the fluctuation of wastewater temperature, which contributed to the bulking sludge problem