Method and system for treating sewage by adopting biological phase coupling aerobiotic FBC technology

Abstract

The invention provides a method and system for treating sewage by adopting a biological phase coupling aerobiotic FBC technology. The method comprises the steps that pretreated raw water is conveyed to a first-stage anaerobic tank, a second-stage anaerobic tank, an anoxic tank and an aerobiotic FBC tank in sequence for treatment of a nitrogen and phosphorus removal technology to obtain a mixed liquid; the mixed liquid is subjected to flow division, a part of mixed liquid is conveyed back to the anoxic tank through an oxygen elimination tank, and the other part of the mixed liquid is conveyed to a final sedimentation tank for treatment to obtain sludge and sewage; the sewage is discharged into a deep sewage removal treatment unit for subsequent treatment; the sludge is subjected to flow division, a part of sludge is directly conveyed to the anaerobic tanks, and the other part of sludge is conveyed to a deep sludge treatment unit for subsequent treatment. According to the method and system for treating the sewage, energy utilization, reclamation, short-cut nitrification and denitrification and anaerobic ammonia oxidation of a main technology for town sewage are ingeniously integrated; perfect energy conservation and carbon saving of the system are achieved, and the method and system for treating the sewage can be widely popularized in upgrading and reconstruction of sewage treatment plants and the market of reclaimed water utilization on a national scale.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method and a system for treating sewage with biological and phase-coupling aerobic FBC technology. Background technique [0002] At present, more than 50% of the eight major watersheds in my country have a COD (chemical oxygen demand) lower than 150mg / L, and there is a situation of low COD and high total nitrogen, which increases the difficulty of sewage treatment. For low-concentration COD and low carbon-to-nitrogen ratio sewage, in order to ensure the effect of nitrogen and phosphorus removal, it is necessary to supplement carbon sources into the sewage. At present, the upgrading and upgrading technology of urban sewage is very difficult. How to achieve a high nitrogen and phosphorus removal rate in low-carbon sewage and meet the effluent standard of Class IV on the surface is still a real problem in front of us. Contents of the invention [0003] The object of th...

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Problems solved by technology

At present, the upgrading and upgrading technology of urban sewage is very difficult. How to achieve a high nitrogen and phosphorus removal rate for low-carbon sewage and meet the effluent standard of Class IV on the surface is still a practical problem in front of us.

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