An Improved Oxidation Ditch Process for Up to Standard Surface Water ⅳ

Abstract

The invention discloses an improved oxidation ditch process for obtaining standard IV-class surface water. The process includes the following steps that pretreatment is carried out, pretreated wastewater is discharged into an anaerobic tank, an anoxic tank, a surface aeration oxidation ditch, a tail-end anoxic zone and an end aerobic zone in sequence; solid-liquid separation is carried out through a secondary sedimentation tank; supernatant liquid discharged out of the secondary sedimentation tank enters a coagulation reaction tank, and outlet water from the coagulation reaction tank enters a denitrification filter tank; the water is discharged after being disinfected. According to the process, the anaerobic tank is arranged at the front end of the surface aeration oxidation ditch and used for biological phosphorus removal, and the anoxic tank is used for backflow of nitrate nitrogen mixed liquid contained in the tail end of the surface aeration oxidation ditch for denitrification nitrogen removal; the anoxic zone is arranged at the rear end of the surface aeration oxidation ditch, and an external carbon source is added and used for further removing nitrate nitrogen contained in outlet water from the oxidation ditch; the aerobic zone is arranged behind the anoxic zone and used for consuming residual excess organic matter; a raw water carbon source is fully utilized for pre-denitrification nitrogen removal in the oxidation ditch process, and it can be guaranteed that the outlet water standard of IV-class water is stably met.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to an improved oxidation ditch process for surface water up to Class IV. Background technique [0002] With the increasingly prominent problem of water pollution in our country, the improvement of urban sewage treatment and discharge standards has become the general trend. Judging from the current requirements for improving the quality of the water environment, the effluent treated by many urban sewage treatment plants is often discharged into urban rivers and becomes the water body of the river. The discharge standards of the existing sewage treatment plants in my country refer to Class A in the "GB 18918-2002 Pollutant Discharge Standards for Urban Sewage Treatment Plants". However, for the first-class A standard, its water quality is only equivalent to the inferior V-class water of surface water. This kind of water is discharged into the water body environment with l...

AI Technical Summary

Problems solved by technology

This kind of water quality is discharged into the water body environment with little self-purification ability, resulting in the water body not only not being repaired, but polluted instead, so the phenomenon of "the more it is treated, the more dirty it is" appears

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