Abstract
Individual sewage treatment process (ISTP) is classified into a sewage treatment system which treats all the domestic sewage and a water-purifier tank which treats only effluent flushing from the toilet. The granular sludge-sequencing batch reactor (GS-SBR) represent an attractive alternative to the ISTP due to their small footprint and their low energy consumption and excess sludge production. The objectives of this study is to analyze an operating factors of the ISTP for enhancing nitrogen removal and to figure out the performance of anaerobic/oxic GS-SBR as an alternative of ISTP (activated sludge process, contact oxidation process, biofiltration process). As a result, the efficiencies of the real ISTP showed a very fluctuating effluent qualities (BOD 0.5-47.6 mg/L, COD 1.4-71.1 mg/L, T-N 1.1-114.7 mg/L, T-P 0.073-15.041 mg/L). This indicates an alternative of cost-effectiveness process is needed to enhancing nitrogen removal rate despite a fluctuating influent concentration. As an alternative to the ISTP, the GS-SBR performance achieved high nitrogen efficiencies of <79.8 % at influent carbon/nitrogen (C/N) ration of 1-3, the food/microorganism (F/M) ratios of 0.25kgCOD /kgMLVSS/d, and the operation mode of aeration/non-aeration (1.5:1-3:1). This result indicates the anaerobic/oxic GS-SBR could be used as an alternative of the ISTP to improve the river water quality.
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