Abstract
Grey water from 70 household and some factories in a region without sewer was treated by sequencing batch reactor activated sludge process. Intermittent aeration manner was applied in this study, and several screens were installed in the reactors to remove the massive solid like leaf from the wastewater with the flow rate 26 m3. BOD concentration of influent was more than about 20 mg·l-1.
Under operation condition of 4 cycles in a day, removal efficiencies of BOD, T-N and T-P were about 92%, 78% and 87%, respectively. Moreover, effluent NH4-N concentration was maintained about 0.5 mg·l-1 by controlling the amount of aeration.
When the water tempareture was 11°C in winter, number of cycle in a day was reduced twice and aeration time increated for good effluent water quality. The results showed that good removal efficiencies were achieved under these conditions.
