Improved SBR wastewater treatment process for obtaining standard IV-class surface water

Abstract

The invention discloses an improved SBR wastewater treatment process for obtaining standard IV-class surface water. The process includes the following steps that wastewater is pretreated to remove SS in the wastewater; pretreated outlet water enters an SBR tank, 60 min of stirring, 60-80 min of first-time aeration, carbon source addition, 30 min of stirring, 10 min of second-time aeration, 40 min of precipitation and 60 min of drainage are carried out in sequence, and then a next period of treatment is carried out; supernatant liquid drained out of the SBR tank enters a coagulation reaction tank for chemical phosphorus removal; outlet water from the coagulation reaction tank enters a denitrification filter tank to further remove residual nitrate nitrogen; outlet water from the denitrification filter tank enters a disinfection tank, and after being disinfected, the water is drained. The steps of inlet water stirring, first-time aeration, carbon source addition and stirring, second-time aeration, precipitation and drainage are carried out in sequence in the SBR reaction tank, advanced nitrogen removal is carried out in combination with the post-denitrification filter tank, an advanced chemical phosphorus removal process is adopted, and thus a good nitrogen and phosphorus removal effect is achieved.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to an improved SBR sewage treatment 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. For the effluent of my country's existing sewage treatment plants, the discharge standards mostly refer to Class I A in the "GB18918-2002 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 wat...

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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