Method for sequencing batch type nitrogen, phosphorus, and COD pollution burthen of high concentration waste water

Abstract

The invention discloses a highly effective denitrification, synchronizing dephosphorize, sterilization disinfection, effectively remove COD contaminant and one-step realize pH discharge disposing method of high concentration septic tank domestic sewage and breeding waste water in environmental engineering technology domain, which comprises the following steps: making calcium oxide as dominant water treatment agent; adjusting pH value of waste water; transforming nitrogen compound to free ammonia; proceeding blending flocculation and chemical precipitation with deposit contaminant; proceeding surface blow-off continually; dissolving free ammonia into absorption liquid; reclaiming. The contaminant clearance is 82.2%-90.3% ammonia nitrogen, 82.0%-90.2% total nitrogen, 84.4%-97.0% total phosphor, 52.5%-78.8% COD, waste water pH<=9, which can realize synchronizing disinfection. The discharging water can discharge directly or proceed future dispose.

Description

Technical field [0001] The invention belongs to the technical field of environmental engineering, relates to a method for treating wastewater containing high pollutant load, especially high-concentration ammonia nitrogen pollutants, and is a process method for strengthening primary wastewater treatment. Background technique [0002] The concentration of pollutants such as nitrogen, phosphorus, and COD in septic tank domestic sewage and aquaculture wastewater is very high. Domestic sewage generally has ammonia nitrogen > 100mg / l, total phosphorus > 15mg / l, and COD > 600mg / l. The concentration of pollutants in aquaculture wastewater is as high as Several times or even dozens of times that of domestic sewage. The discharge of high-concentration domestic sewage and aquaculture wastewater has deteriorated the water environment, and eutrophication of a considerable number of natural water bodies has occurred frequently, resulting in a shortage of water resources including...

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Problems solved by technology

[0003] At present, for the treatment of high-concentration septic tank sewage and aquaculture wastewater, it is difficult to achieve efficient removal of wastewater nitrogen or phosphorus by flocculation sedimentation or biological single technology; the method of combining flocculation sedimentation and biological treatment is complicated in operation and management due to the complexity of the process. It is cumbersome, the treatment cost is high, and the biological treatment is limited by geographical conditions, so the treatment effect is not ideal; generally, the A2 / O (anoxic / aerobic / anaerobic process) method has a better effect of removing nitrogen and phosphorus in wastewater treatment, but for ammonia nitrogen When the concentration reaches 300mg / l and the effluent requirements meet the secondary standard of "Pollutant Discharge Standards for Urban Sewage Treatment Plants--GB 18918-2002", theoretically a wastewater reflux ratio >10 is required. Such a high reflux ratio requirement makes the treatment cost obvious. increase, otherwise the standard discharge cannot be achieved; due to the high nitrogen load in the influent and the poor nitrogen removal effect, a considerable number of wastewater treatment plants cannot operate stably and discharge up to the standard; the calcium oxide treatment tower stripping absorbs high-concentration wastewater for denitrification, and the equipment is complex and High requirements for operation and management, easy clogging of stripping towers, secondary pollution caused by ammonia emissions from stripping, and high costs limit its application; free surface absorption denitrification method occupies too much land resources, cannot efficiently denitrify and significantly reduce other pollutant load

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