AALOO multipoint water feeding synchronization denitrification and dephosphorization process, operation method thereof, and used biological reaction tank

Abstract

The invention provides an AALOO multipoint water feeding synchronization denitrification and dephosphorization process. All pretreated wastewater Q1 enters an anaerobic tank, then flows through an anoxic tank, a low oxygen tank, a short-term aerobic tank and a precipitation tank sequentially, and then is discharged from the precipitation tank. Partial pretreated wastewater Q2 directly enters the low oxygen reaction tank, then flows through the short-term aerobic tank and the precipitation tank sequentially, and then is discharged from the precipitation tank. One part of precipitated sludge flows back to the anaerobic tank, and the other part of the precipitated sludge is discharged from the precipitation tank as excess sludge. Mixed liquid return channels are arranged between the low oxygen reaction tank and the anoxic tank, and the mixed liquid return channels are also arranged between the short-term aerobic tank and the low oxygen reaction tank. A returned sludge contact reaction region is arranged on the front end of the anaerobic tank, and water feeding points are arranged both on the front end region and the rear end region of the anaerobic tank. The method has a simple flow, and is adaptable to wastewater quality change, and is capable of removing nitrogen and phosphorus from wastewater with low carbon source and low oxygen consumption. The method is applicable to rebuilding or building of a municipal wastewater treatment plant which has nitrogen and phosphorus removing requirements.

Description

Technical field: [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a bioreaction tank used in an AALOO multi-point water inflow synchronous denitrification and dephosphorization process and operation method. The method is suitable for the removal of nitrogen and phosphorus in urban sewage, especially under low-carbon source conditions Nitrogen and phosphorus removal to obtain effluent that meets the first-class A or higher discharge standard of the Pollutant Discharge Standard for Urban Sewage Treatment Plants. Background technique: [0002] In order to prevent and control water pollution and improve the water environment, my country has successively issued a number of policies, regulations and standards in the past ten years, and the requirements for sewage treatment and its discharge have become more and more stringent. The "Pollutant Discharge Standards for Urban Sewage Treatment Plants" GB18918-2002 promulgated...

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Problems solved by technology

Although a relatively stable effluent quality with extremely low TP and TN (TP<0.2mg / L, TN<0.5mg / L) can be obtained, the process flow is more complicated, and there are three mixed liquor refluxes in addition to the sludge reflux (Two internal refluxes are added compared to the UCT process), and there is also a bypass precipitation chemical phosphorus removal unit, which increases the operation management and operation difficulty of the process

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