Method for treating municipal sewage by adopting millipore FBR (Filter Bio-reactor)

Abstract

The invention discloses a method for treating municipal sewage by adopting a millipore FBR (Filter Bio-reactor), belonging to the technical field of resources and environments. The municipal sewage can be treated by adopting a mode of combining aerobic denitrification with a dual-layer millipore filter tank in the method, thus pollutants, such as NH3-N, TN (Total N), COD, SS, TP (Total Phosphorus) and the like, in the municipal sewage can be greatly effectively reduced, the treated discharge water can reach the national earth surface IV class water standard, wherein CODCr is not more than 30mg/l, NH3-N is not more than 1.5mg/l, the total N (lake, reservoir, in the terms of N) is not more than 1.5mg/l, the total phosphorus (in the terms of P) is not more than 0.3mg/l, and the potassium permanganate index is not more than 10. The discharge water can be directly discharged in an earth surface riverway so as to reduce the environment pollution and meet the requirement on the increasingly improved municipal sewage emission standard. The invention can be applied to building municipal sewage treatment plants and modifying and reconstructing the traditional sewage treatment plants.

Description

technical field [0001] The invention relates to an urban sewage treatment method in the technical field of resources and environment. The microporous filtration bioreactor-FBR (Filter bio-reactor) combined with aerobic denitrification and double-layer microporous filter tanks is used for urban sewage treatment, which can greatly remove NH in urban sewage 3 -N, TN, COD, SS, TP and other pollutants, the treated effluent can meet the national surface water standard IV, can be directly discharged into surface rivers, reduce environmental pollution, and meet the increasing requirements of urban sewage discharge standards. It can be applied to urban sewage and other water source treatment similar to urban sewage water quality. Background technique [0002] With the severe situation of my country's water environment, urban sewage treatment is facing a situation of gradually increasing standards. Beijing's urban sewage treatment and drainage standard has been raised to the nationa...

AI Technical Summary

Problems solved by technology

[0007] The traditional biological denitrification process generally has the following problems: in the presence of a large amount of organic matter, the competition ability of autotrophic nitrifying bacteria for oxygen and nutrients is not as strong as that of decarburizing aerobic heterotrophic bacteria, which leads to the dominance of heterotrophic bacteria; denitrification Need to provide appropriate electron donors, usually organic matter; nitrification reaction and denitrification reaction have very different mass concentration requirements for DO

This has caused two problems, one is that the flux of treated water is limited, more membrane modules are needed to complete the water treatment, and the investment must be high; the other is that water must overcome the resistance of the membrane to pass through the membrane, resulting in Higher energy consumption; at the same time, because the pore size is small and easy to block, it is necessary to use a large air flow rate for aeration, so that the mixed liquid flows upward with the air flow and generates shear force on the membrane surface. Only when the membrane is forced to leave the surface of the membrane can it delay the clogging of the membrane, increase the power consumption, and also lead to the problem of short service life of the membrane. Generally speaking, the average use time of the membrane is 2 to 3 years, and the cleaning and maintenance costs are very high.

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