Device and method for maintaining stable operation of short-cut nitrification/anaerobic ammonia oxidation integrated treatment of urban sewage

Abstract

The invention relates to a device and a method for maintaining stable operation of short-cut nitrification / anaerobic ammonia oxidation integrated treatment of urban sewage, and belongs to the technical field of sewage biological treatment. Shortcut nitrification / anaerobic ammonia oxidation is a research hotspot in the technical field of sewage treatment. How to maintain stable operation is one ofthe problems that it is widely used in urban sewage treatment plants. The activity of nitrite oxidizing bacteria NOB is inhibited by hydroxylamine adding combined with multistage A / O operation, short-cut nitrification is started quickly, and after inoculating of anaerobic ammonia oxidation floc sludge, flocculant ferric trichloride is added to promote rapid formation of granular sludge and stabilize the operation of the reactor. Compared with the traditional biological denitrification of the sewage, the device has the advantages of low consumption and high efficiency, simple reaction device, strong operability, stable operation and the like.

Description

technical field [0001] The invention relates to a device and method for maintaining stable operation of short-range nitrification / anammox integrated treatment of urban sewage, belongs to the technical field of sewage biological treatment, and is suitable for high-efficiency denitrification of urban sewage with low carbon-to-nitrogen ratio. Background technique [0002] With the continuous improvement of people's living standards, the requirements for the quality of the living environment are getting higher and higher, and the condition of the water environment is closely related to people's daily life, so how to protect the water environment is an eternal problem. Due to the low carbon-to-nitrogen ratio of urban sewage, the carbon source in the denitrification stage is insufficient, making denitrification difficult. Generally, urban sewage treatment plants solve this problem by adding additional carbon sources, but this will not only greatly increase the cost of sewage treatm...

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Problems solved by technology

[0005] Although short-cut nitrification / anammox has advantages that cannot be ignored, it is currently only widely used in the treatment of high ammonia nitrogen wastewater, and its application to mainstream denitrification in urban sewage treatment plants still faces many problems. The most prominent problem is It is difficult to maintain short-term nitrification stability, once aeration occurs, it is easy to be destroyed, and the water quality of urban sewage fluctuates greatly, which is a great challenge for the actual operation of sewage treatment plants; in addition, sewage biological treatment reaction The population of microorganisms in the container is relatively rich, and the abundance and activity of anammox bacteria are easily affected by NOB and denitrifying bacteria. Studies have shown that in the case of low ammonia nitrogen and low nitrite nitrogen concentrations, NOB has no effect on nitrite It has a higher affinity. Therefore, when applying the anammox process, the NOB activity must be reduced as much as possible under the mainstream conditions. This is the basis for ensuring the normal operation of the anammox process and is directly related to its treatment effect. The ammox bacteria are autotrophic bacteria, and the COD contained in the sewage helps the growth of the heterotrophic denitrifying bacteria and inhibits the anammox process. Only when the COD is consumed to a low level, the anammox process can It may be dominant; temperature is also an important factor affecting the activity of anammox bacteria. Studies have shown that 35°C is the optimum temperature for the fastest biological metabolism and the shortest generation cycle of anammox bacteria. However, most actual urban sewage The water temperature is low, especially in northern China, where the wastewater temperature is often lower than 10°C, which is also a major bottleneck for the promotion and application of anammox; finally, how to retain anammox bacteria to the maximum is also a problem we need to solve

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