Sewage treatment method based on A<3>/O-BAF process

Abstract

The invention relates to the technical field of sewage treatment, and discloses a sewage treatment method based on an A<3> / O-BAF process. The method comprises the following main steps: pre-denitrification, hydrolysis acidification, denitrification, aerobic respiration and sludge sedimentation. A filtering function is adopted and improved in order to meet solid-liquid separation requirements of high sludge concentration and subsequent sedimentation in the aerobic respiration; and nitrification liquid reflux and sludge discharge measures are adopted to make the sewage treatment achieve high-efficiency nitrogen and phosphorus removal operation. The sewage treatment method integrates an activated sludge process (A / O) and a biomembrane process (BAF), fully utilizes the advantages of the processes to complement each other, and has the advantages of small occupied area, low cost, low noises, environmental protection, high efficiency and energy saving; and effluent water is superior to grade Astandards of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002).

Description

Technical field [0001] The invention relates to the field of sewage treatment, in particular to a 3 / O-BAF process sewage treatment method. Background technique [0002] With the development of economy and society, water resources are becoming increasingly scarce. How to deal with contaminated water resources has become one of the important ways for countries around the world to alleviate the water crisis. Therefore, the research and development of sewage treatment technology has always been a hot issue of people's attention. [0003] After more than 100 years of development, modern sewage treatment technology has ushered in new challenges and opportunities. The development direction of sewage treatment will also develop in a more in-depth direction in terms of diversification, compactness, sustainability, and adaptability. Applications must also coexist with various technologies. [0004] At present, there are many processes used in urban sewage treatment in my country, but variou...

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Problems solved by technology

[0004] At present, there are many processes used in urban sewage treatment in our country, but each process has many advantages and disadvantages. In particular, many projects do not specifically select processes based on water quality conditions, resulting in substandard effluent water quality or high operating costs. These will be our problems. Urgent

Anaerobic-Anoxic-Aerobic (A 2 / O) process is a typical activated sludge process, and it is also the simplest simultaneous denitrification and phosphorus removal process; but a single A 2 It is difficult to improve the nitrogen and phosphorus removal effect of the / O process, the growth of sludge has a certain limit, and the effluent can only reach the first-class B standard

The biological aerated filter (Biological Aerated Filter, BAF) in the biofilm method integrates the interception and filtration efficiency of the filter layer and the strong oxidative degradation ability of the biofilm. Nitrogen removal and other aspects have shown stable and good treatment efficiency. However, this process also has strict requirements on influent water quality, large head loss, easy blockage and hardening of biological fillers, high energy consumption due to frequent backwashing, and high degree of automation. Require

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