Process method of MBBR (Moving Bed Biofilm Reactor) for treating urban sewage

Abstract

The invention discloses a process method of an MBBR (Moving Bed Biofilm Reactor) for treating urban sewage. The process method comprises the steps that suspended matters and part of organic matters in the urban sewage which is subjected to primary treatment are removed, then the urban sewage enters into an anaerobic zone, an aerobic zone and an anoxic zone of the MBBR in sequence by an intake sump, and enters into a secondary sedimentation tank through the anoxic zone; carriers are suspended in the anaerobic zone of the MBBR, and the surfaces of the carriers are attached with nitrobacteria, which is conductive to growth of the nitrobacteria with long sludge age, the organic matters can be subjected to degradation treatment by activated sludge in all zones, and phosphorus in the sewage is processed by the activated sludge, so as to realize simultaneous nitrogen and phosphorus removal. The process method disclosed by the invention has the characteristics that the effect of nitrogen and phosphorus removal is good and the utilization rate of organic matters is high, meanwhile, the sludge production is low, the nitrification liquid reflux does not exist, the operation cost is reduced, and the process method is particularly suitable for treating domestic sewage with low ratio of C / N.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an MBBR process method for treating urban sewage. Background technique [0002] Under the new situation where the pressure on the water environment is becoming increasingly prominent, the efficient and stable operation of sewage biological treatment technology can enable the reuse of sewage resources, and can effectively solve the current situation of water resource shortage, water environment pollution, and water ecological destruction that our country is currently facing. , to achieve a healthy and sustainable cycle of water. [0003] Due to the continuous improvement of people's living standards and the gradual increase in the amount of sewage, the current urban domestic sewage gradually shows the nature of low C / N, resulting in a relative shortage of organic carbon sources in the denitrification process and low denitrification efficiency, which contradicts the TN com...

AI Technical Summary

Problems solved by technology

[0003] Due to the continuous improvement of people's living standards and the gradual increase in the amount of sewage, the current urban domestic sewage gradually shows the nature of low C / N, resulting in a relative shortage of organic carbon sources in the denitrification process and low denitrification efficiency, which contradicts the TN compliance of the effluent; On the other hand, the traditional single-sludge biological nitrogen and phosphorus removal process (such as A 2 O) Phosphorus accumulating bacteria, denitrifying bacteria, nitrifying bacteria, etc. coexist in the same activated sludge system, there must be a dispute between nitrifying bacteria and phosphorus accumulating bacteria at different sludge ages (SRT), so that phosphorus removal and nitrification interfere with each other, and because Nitrifying bacteria are autotrophic obligate aerobic microorganisms, denitrifying bacteria and phosphorus accumulating bacteria are heterotrophic facultative bacteria, although the alternating anaerobic / anoxic / aerobic operating conditions of the system are conducive to denitrification and phosphorus removal , but it is unfavorable for the growth of nitrifying bacteria

According to the traditional phosphorus removal theory, the existence of carbon source in the anoxic section or the presence of nitrate in the anaerobic section will lead to competition between denitrifying bacteria and DPB for electron acceptor nitrate nitrogen or carbon source, thereby reducing the selective advantage of DPB , affecting the phosphorus removal effect

Therefore, it is difficult for traditional biotechnology to achieve the performance balance of nitrogen and phosphorus removal in the same system.

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