Culture method of aerobic granular sludge for simultaneous denitrification and dephosphorization of domestic sewage at low and normal temperature

Abstract

A culture method of aerobic granular sludge for simultaneous denitrification and dephosphorization of domestic sewage at low and normal temperature belongs to the sewage treatment field and is characterized in that: an SBR reactor adopts 2-10 ratio of height to diameter and 50-67 percent of volume exchange rate without regulation and control over water temperature. The precipitation time is 30-50min, and is reduced gradually to 1-3min; or the precipitation time is set as 5-8min, and is reduced gradually to 1-3min. In biochemical reaction process, dissolved oxygen concentration DO, oxidation-reduction potential ORP and pH value are taken as real-time control parameters to control stirring time in real time (denitrification, phosphorus release), aeration time (organic matter oxidation, nitration, denitrification, aerobic phosphorus absorption, denitrifying phosphorus absorption). The method can improve the content of nitrobacteria and phosphate accumulating organisms, realizes the simultaneous denitrification and dephosphorization of low-COD domestic sewage at low and normal temperature through the aerobic granular sludge in anaerobic / aerobic manner, is simple in process, low in sludge yield, high in reaction efficiency, good in sludge precipitation performance and small in the area occupied by the reactor, and solves the problems of low operation efficiency and unstable treatment of nitrogen and phosphorus caused by time programmed control of a sewage treatment system.

Description

technical field [0001] The invention relates to a sewage treatment process and its control device and method, in particular to an aerobic granular sludge process for treating low COD / N / P actual domestic sewage at room temperature and simultaneously denitrification and phosphorus removal process and its intelligent control device and method . Background technique [0002] With the vigorous development of my country's sewage treatment industry, the country's requirements for sewage discharge are becoming more and more stringent. However, the problem of eutrophication caused by nitrogen and phosphorus pollution has not only not been solved, but has become increasingly serious. In 2002, my country's newly promulgated "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) requires that all urban sewage treatment plant effluents be discharged into rivers with small dilution capacity as urban landscape water and general reuse water, etc., Implement the A s...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a cultivation method and its fuzzy control device for treating domestic sewage at room temperature and low temperature while simultaneously denitrifying and dephosphorizing aerobic granular sludge, so as to increase the content of nitrifying bacteria and phosphorus accumulating bacteria, increase the volume load, and solve the problem of low COD / N / P The problem of high-efficiency discharge of nitrogen and phosphorus in normal and low temperature domestic sewage; greatly improve the sedimentation performance of sludge, shorten the sedimentation time, and reduce the occupied area; solve the low operating efficiency and nitrogen and phosphorus caused by the time program control of the existing sewage treatment system Remove unstable issues

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