磁场对短程硝化工艺运行效果的影响

EFFECT OF MAGNETIC FIELD ON RUNNING PERFORMANCE OF SHORTCUT NITRIFICATION PROCESS

以模拟城市生活污水为处理对象,采用SBR反应器,在常温条件下启动短程硝化工艺,并对反应器施加磁场,研究磁场作用下短程硝化工艺启动及亚硝酸盐积累过程,并分析磁场对污泥胞外聚合物合成的影响。结果表明:常温运行条件下施加磁场的反应器能够更快地实现短程硝化,磁场作用可显著缩短工艺启动周期,并稳定运行。磁场作用下反应器亚硝酸盐积累率可达90%,显著高于无磁场作用下的反应器。磁场作用下微生物氧利用率和氨利用率均有所提高,同时溶解氧浓度较低,有利于氨氧化菌的生存。而磁场刺激了污泥胞外聚合物的合成和分泌,有利于污泥絮体内部形成微氧区域,从而促进了氨氧化菌的活性,有利于亚硝酸盐的积累和短程硝化工艺的实现。

Two SBRs were used to achieve the shortcut nitrification process at room temperature,and one of them SBR was exposed to magnetic field（ MF） to investigate the impacts of MF on the startup of shortcut nitrification process and the synthesis of extracellular polymeric substance（ EPS）. The results showed that： The shortcut nitrification process could be achieved more quickly in the reactor with MF,and MF could shorten the startup period and keep the process running stably.With MF exposed,the nitrite accumulation rate in the reactor reached 90%,which was significantly higher than the reactor without MF. The existence of MF could enhance the oxygen uptake rate and ammonium utilization,lead to low dissolved oxygen concentration in the reactor,which favored the growth of ammonium oxidizing bacteria（ AOB）. In addition,the MF stimulated the synthesis and secretion of EPS,which was in favor of the forming of microaerobic region. It could enhance the activity of AOB,and could increase the accumulation of nitrite.