Deep treatment and recycling method for municipal sewage on basis of biochemical and electrolytic technologies

Abstract

The invention discloses a deep treatment and recycling method for municipal sewage on the basis of biochemical and electrolytic technologies. The deep treatment and recycling method comprises the following steps: (1) anaerobic treatment; (2) anoxic and aerobic treatment; (3) secondary precipitation; (4) nano-catalytic electrolysis (NCE); (5) flocculating precipitation or coagulating precipitation; and (6) filtering. The deep treatment and recycling method comprises the detailed steps of firstly adopting anaerobic treatment for the sewage, then carrying out anoxic and aerobic alternative treatment and secondary precipitation, and then adopting a combined process of electrolysis, flocculating precipitation or coagulating precipitation and filtering to lead the municipal sewage to be treated and reach surface fourth-type or third-type water quality standard. The deep treatment and recycling method disclosed by the invention has the advantages that COD (Chemical Oxygen Demand), BOD (Biochemical Oxygen Demand), chromaticity, ammonia nitrogen and total nitrogen are removed by electrolysis; the COD, petroleum and vegetable oil are removed by flocculating precipitation or coagulating precipitation, and simultaneously phosphorus, partial organic matters and total nitrogen are removed; and solid particulate matters (SS) are removed by filtering, and the filtered water reaches the surface fourth-type or third-type water quality standard.

Description

technical field [0001] The invention belongs to the field of water pollution control of environmental engineering, and more specifically relates to a method for advanced treatment of municipal sewage to make it reach the water quality of Class 4 or Class 3 on the surface so as to meet the recycling requirements. Background technique [0002] In order to strengthen sewage treatment management and control water pollution, in 2002 the state promulgated the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002). In 2006, the former State Environmental Protection Administration adjusted the implementation objects of the first-level A standard and the first-level B standard in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), requiring that the effluent of urban sewage treatment plants be discharged into the country When the key river basins and lakes, reservoirs and other closed and semi-closed waters determined by the...

AI Technical Summary

Problems solved by technology

[0008] These two processes not only require large investment and high operating costs, but also the discharged water after treatment can only meet the first-level A standard effluent indicators of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), and should be used as reclaimed water. Advanced treatment is required to meet the water quality standards of reclaimed water. Therefore, there is an urgent need for an economical and practical method for advanced sewage treatment and recycling.

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