曝气量对同时硝化/反硝化除磷工艺效能的影响

Influence of Aeration Rate on Simultaneous Nitrification/Denitrification Phosphorus Removal

在恒定曝气量、连续曝气的厌氧/低氧SBR反应器内,以碳源偏低的模拟城市污水为研究对象,考察了不同曝气量下的同时硝化/反硝化除磷(SNDPR)效能。当曝气量为40 L/h时,较其他三种曝气量能维持SNDPR的稳定,对TN和TP的去除率分别为79.9%和92.8%,PHB降解速率平稳,硝化和反硝化除磷速率相当,SNDPR脱氮除磷效能最佳。因此,在连续曝气模式下,曝气量过低或过高均不利于SNDPR的持续稳定,且当曝气量过高时,随曝气量的增加则SNDPR发生程度降低,持续时间缩短。同时,PHB降解速率的均衡也是实现稳定的SNDPR的关键因素。

The anaerobic/low oxygen sequencing batch reactor operated under the mode of contin- uous aeration with constant aeration rate was used to treat low carbon municipal wastewater, and the sim- ultaneous nitrification and denitrification phosphorus removal （SNDPR） efficiency at different aeration rates was investigated. When the aeration rate was 40 L/h, the SNDPR could be maintained stably com- pared with the other three aeration rates, and the removal rates of TN and TP were 79.9% and 92.8% respectively. The degradation rate of PHB was stable, the nitrification and denitrification phosphorus re- moval rates were well matched, and the SNDPR efficiency was the best. These results suggested that the low or high aeration rate was unfavorable to the stability of SNDPR at continuous aeration. Under the con- dition of high aeration rate, if the aeration rate was increased, the stable level and duration time of SND- PR were reduced and shortened respectively. Keeping the balanced degradation rate of PHB was the key factor of the stable SNDPR.