Effect of alum on nitrification during simultaneous phosphorous removal in anoxic/oxic reactor |
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Authors: | J Rajesh Banu Khac-Uan Do S Kaliappan Ick-Tae Yeom |
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Institution: | (1) Department of Civil and Environmental Engineering, SungKyunKwan University, 300, Chunchun-dong, Jangan-gu, Suwon-Si, 440-746, South Korea; |
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Abstract: | Phosphorus and nitrogen are the important eutrophication nutrients. They are removed in the anoxic/oxic reactor through simultaneous
precipitation and biological nitrogen removal. The effect of alum a commonly used simultaneous precipitant on biological nitrification
and denitrification are investigated in the present study. Simultaneous removal of phosphorus was carried out using the coagulant
alum Al2(SO4)3·14H2O at 2.2 mol ratio. Before the start of simultaneous precipitation the nitrification rate of the A/O reactor was found to
be 0.05 g N-NH4
+/g VSS/d. It starts to decrease with increase in coagulant dosage. The nitrification rate for alum dosage 97.13 mg/L was 0.38
g N- NH4
+/g VSS/d. There was no accumulation of nitrate in anoxic tank. The nitrogen removal efficiency of the reactor was affected
and it fell from 88 to 78%. There was a slight decrease in effluent COD from 16∼20 mg/L to 8∼12 mg/L after the introduction
of simultaneous precipitation into the reactor. The usage of alum as a simultaneous precipitant in the anoxic/oxic reactor
was limited due to its inhibition on nitrification. Alum did not have any affect over denitrification process. |
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Keywords: | |
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