Method and device for sewage treatment

Abstract

The invention relates to a method and a device for sewage treatment, and relates to the field of waste water treatment. The invention aims to improve a denitrification effect of secondary effluent of a sewage treatment plant and reduce operating energy consumption. The method comprises the following steps of: introducing sewage into an ozone catalytic oxidation tower to perform catalytic oxidation; introducing water discharged from the ozone catalytic oxidation tower into an anoxia biofilter; and introducing the water treated by the anoxia biofilter into an aerobic biofilter, wherein the injected water is subjected to the degradation of concentration of organic matters and the nitration of ammonia nitrogen by a biomembrane grown on the surface of a porous light filler inside the aerobic biofilter, so that the concentration of the organic matters in the water reaches an effluent discharge index. The invention also provides a device for realizing the method. The device comprises two biofilters, a high-pressure fan and an ozone catalytic oxidation tower. By the method and the device, denitrification can be realized effectively, and secondary pollution can be avoided.

Description

technical field [0001] The invention relates to the field of chemical industry, and in particular designs a sewage treatment technology, especially a sewage treatment method and device thereof. Background technique [0002] Biological aerated filter, referred to as BAF, is a new sewage treatment process developed on the basis of ordinary biological filtration in the 1980s and early 1990s with reference to the water supply filter process. primary treatment, and later developed to be used directly in secondary treatment. Since the first biological aerated filter sewage treatment plant was built in Europe in the 1980s, biological aerated filters have become popular in developed countries such as Europe, America and Japan. The treatment plant adopts this technology, reflecting the compound and integrated development trend of sewage treatment process. [0003] The biological aerated filter has the functions of removing SS, COD, BOD, nitrification, dechlorination and phosphorus ...

AI Technical Summary

Problems solved by technology

[0004] In the 1990s, my country began to develop, research and apply biological aerated filters. In terms of advanced sewage treatment, except for some laboratory research and small-scale research conducted by a few universities and research institutions, there are no large-scale engineering application examples; In the denitrification and phosphorus removal experiments, it is often necessary to add carbon sources to meet the needs of denitrification

However, since only using ozone catalytic oxidation to treat sewage, it is not easy to directly mineralize organic matter, and the operating cost and power consumption are too high, so it is not suitable for advanced sewage treatment.

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