Wastewater deep treatment system and method

Abstract

The invention discloses a wastewater deep treatment system and method. The system comprises an AA/O oxidation ditch, a secondary sedimentation tank, and a powdered-activated-carbon immersed ultrafiltration-membrane reactor, the AA/O oxidation ditch consists of an anaerobic tank, an anoxic tank and an aerobic tank, and the powdered-activated-carbon immersed ultrafiltration-membrane(CUF) reactor consists of a carbon water premixing tank and an immersed ultrafiltration-membrane separation tank. Wastewater of a wastewater treatment plant is treated by a pretreatment device and enters the AA/O oxidation ditch through guide pipes; discharged water of the AA/O oxidation ditch is introduced to the secondary sedimentation tank through pipes and is subjected to solid liquid separation; obtained clear water after the solid liquid separation is introduced to the powdered-activated-carbon immersed ultrafiltration-membrane reactor through guide pipes; and obtained clear water after areaction in the powdered-activated-carbon immersed-ultrafiltration membrane reactor is discharged through guide pipes. The wastewater deep treatment system and method provided by the invention employ a wastewater deep treatment technology combining ''reinforced nitrification and denitrification denitrogenation process'', '' biological activated carbon'' and ''CUF'', so that water quality of the discharged water of the wastewater deep treatment system is stable and can stably reach the discharge standard A of the first grade standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant, and thus the standard improving of wastewater treatment plants is realized.

Description

technical field [0001] The invention belongs to the technical field of advanced sewage treatment, and in particular relates to a system and method for improving the standard of a sewage treatment plant, in particular to a submerged ultrafiltration membrane reactor (CUF) that adopts an enhanced denitrification process, biological activated carbon, and powdered activated carbon. A system and method for standard upgrading and transformation of sewage treatment plants combining the above-mentioned technologies. Background technique [0002] During the "Thirteenth Five-Year Plan" period, most sewage treatment plants in my country are facing the problem of upgrading standards. The concentration of organic matter in the sewage of some urban sewage treatment plants is low, but the content of total nitrogen is relatively high. Total nitrogen is the main indicator reflecting the eutrophication of water bodies, and the control of total nitrogen has gradually been included in the contro...

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Problems solved by technology

[0007] In the AA / O oxidation ditch, adjusting the concentration of DO (dissolved oxygen) in the aerobic zone below 2.0mg / L can promote the formation of anoxic and aerobic alternation in the area, which is conducive to the progress of nitrification and denitrification and the realization of total nitrogen. However, due to the decrease of DO concentration, the degradation efficiency of organic pollutants in the aerobic zone decreases, and the concentration of COD and ammonia nitrogen in the effluent cannot reach the treatment effect of complete aeration (DO>2.5mg / L) under the same conditions

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