厌氧/微好氧与A/(O/A)n运行时间配比对SNDPR的影响

在SBR反应器中采用厌氧/微好氧与A/（O/A）_n交替运行模式，考察运行过程中污染物的去除效果、颗粒污泥特性及EPS分泌情况等，探讨厌氧/微好氧与A/（O/A）_n的运行时间配比对短程硝化反硝化除磷（SNDPR）系统的影响.结果表明，在厌氧/微好氧与A/（O/A）_n交替运行方式下，整个运行期间对COD的平均去除率始终保持在90%以上.当厌氧/微好氧与A/（O/A）_n运行时间配比为1：1时，系统内的脱氮除磷性能均有所提高，TP和TN的平均去除率分别达到了95.87%和92.00%，颗粒污泥的结构更为密实，EPS含量达到了92.60mg/gVSS，PN/PS维持在较高水平，而运行时间配比为1：3和3：1时颗粒的稳定性均略有降低.系统内以亚硝酸盐为电子受体的反硝化聚磷菌占比达到了57.76%，比氨氧化速率（以N/VSS计）达到了4.57mg/（g·h），表明厌氧/微好氧与A/（O/A） n运行时间配比为1：1时提高了功能菌的活性，有利于维持良好的短程硝化反硝化除磷性能.

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

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.