Effect of Temperature on Nitrification of Activated Sludge
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 artificial 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 nitrification 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 nitrification rate reached the maximum,reaching 4.3 mgNO3-N/(gMLVSS·h).With the decrease of water temperature,the nitrification reaction rate decreased,and the nitrification reaction rate was only 0.3 mgNO3-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.
万方数据
维普
