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Discussion on the reformation of aeration process of municipal sewage oxidation ditch

Time : 2020-04-07

Source : Making Green Environment Technology (Shanghai) Co., Ltd.

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Discussion on the reformation of aeration process of municipal sewage oxidation ditch

  At present, about 60% to 70% of the domestic municipal sewage treatment process is the oxidation ditch process, especially in the northern region. The oxidation ditch process accounts for a relatively large amount, and the oxidation ditch process is also in many forms. Oxygen 2000, Shuanggou, etc., the oxidation ditch process has the advantages of low organic load, strong impact resistance, land saving, and operating cost savings. However, due to the age of the design and the improvement of people ’s living standards, the original design effluent standard has been unable to meet Existing sewage discharge standards.


  Solving this kind of problem is nothing more than transforming the original process. According to the impact of factors such as site restrictions, renovation funds, and the introduction of new technologies, the content of the renovation can be divided into two categories: expansion and technical improvement. Capacity expansion, as the name implies, is to add sewage treatment facilities on the basis of the original facilities, and use the method of extending the hydraulic retention time to make up for the design defects of the original process. . According to the characteristics of biochemical reactions, the technical transformation is divided into technical transformation schemes to increase the reactants, that is, to improve the aeration system, increase the oxygenation rate of the sewage, and strengthen the system's oxidation of pollutants; The metabolic capacity of organisms to assimilate pollutants in water. The two can also be used in combination.


  Through the analysis of specific cases, due to insufficient design capacity, the system's denitrification effect is poor. Most of the system problems are in the oxidation of nitrogen species. Targeted strengthening and increasing the population of nitrifying and denitrifying bacteria can strengthen the system's denitrification Nitrogen effect. However, the oxygenation capacity of the oxidation ditch is limited. Under high biomass (MLSS = 4-6g / L), it cannot provide sufficient oxygen. Therefore, it is necessary to add an aeration system to strengthen DO in water and provide conditions for the growth and reproduction of nitrifying bacteria.


  According to the specific requirements of user groups, Mianjin Environmental Protection Technology (Shanghai) Co., Ltd. provides specific transformation technology packages for customers with different requirements. Do one factory and one policy to solve customer specific problems. The liftable aeration process is adopted, and the modified process has:


  Ø Unique structural design and diversified connection methods to ensure construction during system operation;

  Ø Microporous gas distribution mode, the system runs more stable;

  Ø Unique diaphragm fastening method, easy to install;

  Ø The diaphragm is processed with original imported materials and advanced technology, with stable physical and chemical properties and long service life;

  Ø Anti-clogging design, suitable for the actual operation of various sewage treatment processes, avoiding the worry of sewage backflow and sludge clogging;

  Ø Low running resistance, high oxygenation efficiency and remarkable energy saving effect;

  Ø Oxidation ditch turntable oxygenation is changed to bottom aerator oxygenation, which has heat preservation function under low temperature in winter.

 


  This process is compared with other current aeration processes:

       

  Transformation case:

  In a municipal sewage treatment plant, after continuous water renovation, the effluent data COD, ammonia nitrogen, and TP meet the requirements of surface water category V, and TN meets the Grade A discharge standard of "Emission Standard for Pollutants in Urban Wastewater Treatment Plants" GB 18918-2002.