ALOAO double-sludge circulation synchronic denitrification and phosphorus removing process, operation method thereof, and employed biological reaction tank

Abstract

The invention relates to an ALOAO double-sludge circulation synchronic denitrification and phosphorus removing process. According to the invention, first, pre-treated sludge is delivered into an anaerobic tank; sludge-water separation is carried out in a first sedimentation tank; an obtained supernatant is delivered into a hypoxic reaction tank; sludge obtained by sedimentation in the first sedimentation tank is directly delivered into an anoxic tank, and is mixed with the liquid discharged from the hypoxic reaction tank; the mixture is delivered into a short-time aerobic tank, and is than delivered into a second sedimentation tank; an obtained supernatant is discharged, and a part of the sludge obtained by sedimentation is delivered back to the anaerobic tank; and the rest of the sludge is discharged as residual waste sludge. According to the invention, mixed liquid reflux is designed on the path from the short-time aerobic tank to the hypoxic reaction tank, and the reflux ratio is set according to requirements. The process and the operation control method provided by the invention have relatively broad adaptability to sewage qualities. The method can be used for removing nitrogen and phosphorus with low carbon source and low consumption on oxygen. Therefore, the method is suitable for the reformation and construction of municipal wastewater treatment plants with requirements on nitrogen and phosphorus removing.

Description

Technical field: [0001] The invention belongs to the technical field of environmental engineering, and particularly relates to an ALOAO dual-sludge cycle synchronous denitrification and phosphorus removal process, which is suitable for the removal of nitrogen and phosphorus in urban sewage, especially the removal of nitrogen and phosphorus under low-carbon source conditions, so as to obtain the requirements of << The effluent of the pollutant discharge standard of urban sewage treatment plant "Class A or higher discharge standard. 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 and implemented in 2002 put forwar...

AI Technical Summary

Problems solved by technology

However, there are some problems in the practical application of this process: 1. Relying entirely on denitrification for phosphorus removal

The current process obviously cannot adapt; 3. The high dissolved oxygen in the biofilm reactor will affect the denitrification and phosphorus removal in the anoxic tank, DO is preferentially used by phosphorus accumulating bacteria, and the removal of nitrogen is affected

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