A method and device for enhanced synchronous denitrification and phosphorus removal sewage treatment

Abstract

The invention discloses an enhanced simultaneous phosphorus and nitrogen removal sewage-treatment method and device. According to the method, biofilm-process water treatment is adopted during activated-sludge-process water treatment. According to the device, a biochemical area is divided into three areas, that is, an anaerobic area, an anoxic area and an aerobic area, and a movable biological elastic filler microorganism bed is used for hovering sewage in the various areas by turns. The method and the device disclosed by the invention have the following characteristics: a movable biofilm system is added in an activated sludge system, thus realizing the combined action of an activated sludge process and a biofilm process, increasing a biomass in a reaction tank, enhancing the effects of organic matter removal, and phosphorus and nitrogen removal, of the system, reducing a sludge sedimentation coefficient, suppressing or slowing down the occurrence of sludge bulking, reducing a sludge amount while increasing the treatment efficiency, and improving the stability of the removal effect of the system in case of water quality and amount fluctuation.

Description

technical field [0001] The invention belongs to the field of environmental engineering sewage treatment, and relates to an enhanced synchronous denitrification and phosphorus removal sewage treatment method and device. technical background [0002] There are two most widely used biological treatment technologies in the development of sewage treatment technology: activated sludge method and biofilm method. The activated sludge method utilizes the powerful microbial population living on the activated sludge under the action of metabolism to make the activated sludge have the ability to convert organic matter into inorganic matter. In the activated sludge bacterial micelles, phosphorus accumulating bacteria, denitrification According to the requirements of the environmental conditions (anaerobic, anoxic and aerobic) for the growth of nitrogen and phosphorus removal microorganisms, through various time and space distributions, return methods and positions of sludge and mixed liq...

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Problems solved by technology

The activated sludge method utilizes the powerful microbial population living on the activated sludge under the action of metabolism to make the activated sludge have the ability to convert organic matter into inorganic matter. In the activated sludge bacterial micelles, phosphorus accumulating bacteria, denitrification According to the requirements of the environmental conditions (anaerobic, anoxic and aerobic) for the growth of nitrogen and phosphorus removal microorganisms, through various time and space distributions, return methods and positions of sludge and mixed liquid, The combination and optimization of water intake methods have formed various activated sludge biological denitrification and phosphorus removal processes. However, due to the different requirements of various microorganisms on environmental conditions, nitrifying bacteria and phosphorus accumulating bacteria are inevitably brought about. The competition of different sludge ages and the competition of denitrifying bacteria and phosphorus accumulating bacteria for organic matter make phosphorus removal and nitrification interfere with each other, and the efficiency of simultaneous nitrogen and phosphorus removal is difficult to further improve, and the amount of sludge produced by activated sludge method is relatively large , and worry about sludge bulking

The biofilm method is to make microorganisms such as bacteria and fungi and micro-animals such as protozoa and metazoans attach to the filler carrier to grow and breed, and form a biofilm on it. When the sewage is in contact with the biofilm, the sewage in the sewage The organic matter is ingested by the microorganisms on the biofilm, and the sewage is purified. The biofilm method has strong adaptability to changes in water quality and quantity. The sludge output is small and the sedimentation performance is good. It has good adaptability to low-concentration sewage, although The biofilm process can have the function of denitrification and denitrification through appropriate operation methods, but because the carrier of the biofilm is relatively fixed, it is generally impossible for the microorganisms to obtain an aerobic state and an anaerobic state for excessive intake of phosphorus through space conversion The method of releasing phosphorus, so the general continuous water biofilm process has almost no phosphorus removal effect

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