温度对活性污泥硝化反应的影响

Effect of Temperature on Nitrif ication of Activated Sludge

温度是影响活性污泥法污水处理厂生物脱氮效果的重要因素。文章中实验采用1套SBR反应器小试装置,接种某城市污水厂曝气池好氧活性污泥,采用16S rDNA高通量测序技术,对活性污泥的菌群进行了检测,并以人工配水为进水,进行了1℃、5℃、8℃、11℃、17℃、19℃、21℃不同水温对活性污泥硝化反应影响进行实验。结果表明:污泥中存在Nitrosomonas(亚硝化单胞菌属)和Nitrospira(硝化螺菌属),相对丰度分别为0.074%和0.341%。21℃时硝化反应速率最大,达到4.3 mgNO_(3)-N/(gMLVSS·h);随着水温的降低,硝化反应速率下降,1℃时硝化反应速率仅为0.3 mgNO_(3)-N/(gMLVSS·h)。研究成果可为低温地区污水处理厂的优化运行,提高脱氮效果提供理论依据。

Temperature is an important factor affecting biological nitrogen removal in activated sludge treatment plants.In this experiment,a set of SBR reactor pilot device was used to inoculum aerobic activated sludge in the aeration tank of a municipal sewage plant.16S rDNA high-throughput sequencing technology was used to detect the microbial community of activated sludge,and artif icial water distribution was used as influent.Experiments were carried out on the effect of different water temperatures at 1℃,5℃,8℃,11℃,17℃,19℃and 21℃on the nitrif ication of activated sludge.The results showed that Nitrosomonas and Nitrospira were present in the sludge,and their relative abundance was 0.074%and 0.341%,respectively.At 21℃,the nitrif ication rate reached the maximum,reaching 4.3 mgNO_(3)-N/(gMLVSS·h).With the decrease of water temperature,the nitrif ication reaction rate decreased,and the nitrif ication reaction rate was only 0.3 mgNO_(3)-N/(gMLVSS·h)at 1℃.The research results can provide a theoretical basis for optimizing the operation of sewage treatment plants in low-temperature areas and improving the effect of nitrogen removal.