Influence of anaerobic/micro-aerobic and A/(O/A)n operating time ratio on SNDPR

LI Dong; WANG Xin-xin; WANG Qin-yuan; LI zhu; ZHANG Jie

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China Environmental Science ›› 2022, Vol. 42 ›› Issue (10) : 4596-4603.

Water Pollution Control

Influence of anaerobic/micro-aerobic and A/(O/A)_n operating time ratio on SNDPR

LI Dong¹, WANG Xin-xin¹, WANG Qin-yuan¹, LI zhu¹, ZHANG Jie^1,2

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Abstract

The operation mode of alternating anaerobic/micro-aerobic and A/(O/A)_n was used in SBR reactor. The effects of anaerobic/micro-aerobic and A/(O/A)_n operating time ratio on the short-range nitrification denitrifying phosphorus removal were discussed by investigating the pollutant removal, granular sludge characteristics and EPS secretion during the operation. The average removal efficiency of COD was always maintained above 90% during the whole operation period under the operation mode of alternating anaerobic/micro-aerobic and A/(O/A)_n. When the operating time ratio of anaerobic/micro-aerobic and A/(O/A)_n was 1:1, the nitrogen and phosphorus removal performance in the system were improved, and the average removal efficiencies of TP and TN reached 95.87% and 92.00%, respectively. The structure of granular sludge was more compact, the EPS content reached 92.60mg/gVSS and the PN/PS was maintained at a high level. However, the stability of the granular sludge decreased slightly when the operating time ratio were 1:3 and 3:1. The proportion of DPAOs with nitrite as electron acceptor and the specific ammonia oxidation rate (N/VSS) in the system reached 57.76% and 4.57mg/(g·h) respectively, which indicated that when the operating time ratio was 1:1, the activity of functional bacteria was improved and it was beneficial to maintain good short-range nitrification denitrifying phosphorus removal.

Key words

aerobic granular sludge / anaerobic/micro-aerobic / denitrifying phosphorus removal / operating time ratio / short-range nitrification

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LI Dong, WANG Xin-xin, WANG Qin-yuan, LI zhu, ZHANG Jie. Influence of anaerobic/micro-aerobic and A/(O/A)_n operating time ratio on SNDPR[J]. China Environmental Science. 2022, 42(10): 4596-4603

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