Effects of nitrite on phosphate uptake in anaerobic-oxic process |
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| Authors: | Li Jie Xiong Biyong Zhang Shude Yang Hong and Zhang Jie |
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| Institution: | (1) College of Environmental Science and Engineering, South China University of Technology, Guangzhou, 510641, China;(2) School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, China;(3) Key Lab of Water Quality Science & Water Environment Recovery Engineering, Beijing University of Technology, Beijing, 100022, China |
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| Abstract: | An anaerobic-oxic (A/O) biological phosphorus removal reactor was operated to study the effect of nitrite on phosphate uptake.
The phosphorus uptake profile was determined under different operating conditions. The results indicated that in addition
to oxygen and nitrate (DPBNa, nitrate denitrifying phosphorus removal), to some extent, nitrite could also serve as an electron acceptor to achieve nitrite
denitrifying phosphorus removal (DPBNi). The quantity and rate of phosphorus uptake of DPBNi, however, were evidently lower than that of DPBNa. The experiment results revealed that nitrite would bring toxic action to phosphate-accumulating organisms (PAOs) when NO2
−-N ⩾ 93.7 mg/L. The nitrite existing in the anoxic reactor made no difference to the quantity and rate of denitrifying phosphorus
removal, but it could reduce the consumption of nitrate. Moreover, the data showed that the aerobic phosphate uptake of DPBNi was lower than that of anaerobic phosphorus-released sludge in a traditional A/O process. However, there was not much difference
between these two kinds of sludge in terms of the total phosphorus uptake quantity and the effluent quality.
Translated from Environmental Science, 2006, 27(4): 701–703 译自: 环境科学] |
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| Keywords: | domestic sewage anaerobic-aerobic process nitrite nitrate electron acceptors denitrifying phosphorus removal |
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