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- W2366755841 abstract "The anaerobic sequencing batch reactor(ASBR) and SBR were combined to reduce the sludge production of activated sludge system.Two ASBR/SBR processes,with or without a sludge ozonation,were operated in parallel for 40 days.The effect of simultaneous sludge ozonation on nitrification and denitrification of ASBR/SBR process was investigated.In the test group(with sludge ozonation),ozone was added to the aeration stage of the SBR per 3 cycles with the dosage of 0.027 g/g,the COD removal rate of SBR was 86%,which was 9 percent lower than control group(without sludge ozonation).While,because of the ozone oxidation,a large number of organic matter were released to the mixed liquor which provided a good carbon source for denitrification.Parts of nitrobacteria was deactivated due to the strong oxidation of ozone,but the decreasing excess sludge prolonged the system retention time which benefited the growth of nitrobacteria,so the nitrification capacity of combination process was not influenced.The average effluent NO-2-N of test group was 18.9% higher than that of control group,after 3 cycles of operation,the average effluent NO-2-N was decreased to 7.57 mg/L,which was flat to the control group.The effluent NO-3-N of test group was first higher than that of control group,while it was less than the control group after 3 cycles of operation.The TN removal efficiency of test group and control group was 65% and 75% respectively,the TN removal efficiency of test group was increased to 72% after 3 cycles of operation.It was concluded that nitrification and denitrification in the SBR are not significantly influenced by simultaneous ozonation." @default.
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- W2366755841 date "2012-01-01" @default.
- W2366755841 modified "2023-09-23" @default.
- W2366755841 title "Study on the effect of simultaneous ozonation on nitrification and denitrification of activated sludge system" @default.
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