Water body deep purification system and method

Abstract

The invention discloses a water body deep purification system and method. The water body deep purification system comprises a pretreatment device, a coagulation device, an electrolysis denitrificationdevice, an aerobic device, a deep phosphorus removal device and a sludge treatment device. After polluted water is treated by the pretreatment device, the coagulation device, the electrolytic denitrification device, the aerobic device and the deep phosphorus removal device in sequence, 80-95% of COD in the water can be removed, and the COD of effluent is smaller than or equal to 20 mg / L; 95-99% of BOD is removed, so that the BOD of effluent is less than or equal to 4mg / L; 60-98% of total phosphorus is removed, so that the total phosphorus of effluent is less than or equal to 0.1 mg / L; 95 to 99.99% of ammonia nitrogen is removed; the ammonia nitrogen content of the effluent is less than or equal to 1.0 mg / L, and the removal rate of total nitrogen is 95-99.00%; the total nitrogen content ofthe effluent is less than or equal to 2mg / L, the chroma is removed by 80-95%, and the dissolved oxygen content of the water body is increased to 7mg / L or above, so that the purified water body reaches the III or IV type water quality standard of Environmental Quality Standards for Surface Water (GB3838-2002), and sewage and wastewater are changed into water resources.

Description

Technical field [0001] The invention relates to the technical field of water purification, in particular to a water deep purification system and method integrating coagulation precipitation dephosphorization, electrolytic denitrification, aerobic biochemical, and deep dephosphorization and other devices. Background technique [0002] Urban domestic sewage is a polluted water body produced during people’s lives. The usual physical and chemical indicators are COD≤800mg / L, BOD≤350mg / L, SS≤400mg / L, ammonia nitrogen≤50mg / L, total nitrogen≤70mg / L, total phosphorus ≤10mg / L, pH7-9. At present, domestic and international pollution treatment is divided into primary treatment, secondary treatment and advanced treatment. The main treatment process of primary treatment includes sewage collection, coarse grid filtration, fine grid filtration to aeration sedimentation tank and primary sedimentation tank. The main application processes of secondary treatment include activated sludge treatment ...

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Problems solved by technology

[0003] The invention provides a deep purification treatment device and method for sewage and polluted water bodies with short process flow, low operating cost, strong adaptability to water quality and good continuous effect. Water purification technology has the disadvantages of poor effluent quality, large investment, long purification cycle, and large land occupation, making the effluent of sewage treatment plants meet the water quality standards of Class IV or even III of the "Surface Water Environmental Quality Standards" (GB3838-2002), making water bodies Improve water quality, restore water ecosystems, and realize the reconstruction and healthy and sustainable development of river and lake ecosystems

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