Jutarat Aniwattapong. The efficiency of an anaerobic sequencing batch reactor (AnA2/O2 SBR) in the removal of cod, TKN and TP from Chinese-cake shop wastewater . Master's Degree(Environmental Technology). Mahidol University. : Mahidol University, 2003.
The efficiency of an anaerobic sequencing batch reactor (AnA2/O2 SBR) in the removal of cod, TKN and TP from Chinese-cake shop wastewater
Abstract:
This research investigated the efficiency and the optimum running condition of the anaerobic sequencing batch reactor (AnA2/O2 SBR) in the removal of COD, TKN and TP from Chinese-cake shop wastewater. Three similar anaerobic sequencing batch reactors were operated in the following sequence: 2.5 hours anaerobic fill; 4 hours react; 1 hour settle; 15 minutes draw out; and 15 minutes idle. The experiment was a 32 factorial design with 9 running conditions and was scheduled to control solid retention time (SRT) at 50, 60 and 70 days, with the anoxic time of 2, 2.5 and 3 hours. The results showed that the COD, TKN and TP removal efficiencies were in the range of 90.00%-95.75%, 91.01%-98.78% and 91.74%-98.80%, respectively. The statistical analysis of the data illustrated that no significant differences with regard to TP removal efficiency were found for the anoxic time of 2, 2.5 and 3 hours. Unlike that of TP, the removal efficiency of COD at the anoxic time of 2 hours was slightly higher than that of 2.5 hours and significantly higher than that of 3 hours (P-value=0.008). Different still, the removal efficiency of TKN at the anoxic time of 2 hours was significantly higher than that of both 2.5 and 3 hours (P-value=0.001). No significant differences in COD, TKN and TP removal efficiencies, however, were found for 50, 60 or 70 days SRT. The optimum running condition of AnA2/O2 SBR in the treatment of Chinese-cake shop wastewater was SRT at 60 days and anoxic time of 2 hours, which yielded COD, TKN and TP removal efficiencies of 94.36%, 96.81% and 96.18%, respectively.