Sewage treatment process

Abstract

The present invention discloses one kind of Z's ZAAO sewage treating process. Sewage entering from the bottom of the anaerobic tower is treated through anaerobic biochemical reaction inside the anaerobic tower, flowing from the top of the anaerobic tower into the lower part of the anoxia tower, anoxia reaction inside the anoxia tower, flowing from the top of the anoxia tower into the lower part of the aerobic tower together with air, aerobic reaction inside the aerobic tower, addition of coagulant after flowing from the top of the aerobic tower, separation in the separating tower, addition of disinfector after flowing from the separating tower, and filtering inside the filter to become reused water. Meanwhile, methane is led out from the aerobic tower. The present invention completes the sewage treatment in one complete system.

Description

technical field [0001] The invention relates to a sewage treatment process, in particular to a ZAAO sewage treatment process. Background technique [0002] Sewage treatment methods are usually composed of four series: physical method, chemical method, physical chemical method and biochemical method. Most of them can only complete the whole sewage treatment process by two or more methods. Industrial sewage treatment is based on physical method and chemical method. , Physical and chemical methods are the main body, and high-concentration industrial sewage is also treated by biochemical methods, while the mainstream of urban sewage treatment is the combined process of biochemical methods as the main body. Whether it is industrial sewage or urban sewage, it is based on building structures. Mainly, there are problems such as large land occupation, high investment, high operating costs, poor load resistance, backward management, and low efficiency of processing equipment. [0003...

AI Technical Summary

Problems solved by technology

[0002] Sewage treatment methods are usually composed of four series: physical method, chemical method, physical chemical method and biochemical method. Most of them can only complete the whole sewage treatment process by two or more methods. Industrial sewage treatment is based on physical method and chemical method. , Physical and chemical methods are the main body, and high-concentration industrial sewage is also treated by biochemical methods, while the mainstream of urban sewage treatment is the combined process of biochemical methods as the main body. Whether it is industrial sewage or urban sewage, it is based on building structures. Mainly, there are problems of large land occupation, high investment, high operating costs, poor load resistance, backward management, and low efficiency of processing equipment

[0003] At present, the treatment of sewage has been using a similar process route, such as the traditional activated sludge process, developed to the A / O process and A 2 / O process, the essence is to increase the anaerobic biological treatment and anaerobic tank, in the further treatment of BOD 5 、COD cr At the same time as SS and SS, the effect of phosphorus and nitrogen removal is increased, but the investment cost per ton and operating cost will also increase. Moreover, the treated sewage needs advanced treatment to meet the requirements of reclaimed water reuse. There are few equipments, mainly relying on the pool body , so it is impossible to form industrialization and complete sets of sewage treatment, and its reaction efficiency and treatment efficiency have not been fundamentally improved. Therefore, there is a breakthrough reduction in the investment per ton of sewage treatment and the cost per ton of sewage treatment

[0004] A 2 The advantage of the / O sewage treatment process is that anaerobic (A), anoxic (A) and aerobic (O) alternate operations can achieve the purpose of simultaneously removing organic matter, denitrification, and phosphorus removal, and there are few sludge bulking problems. The process is simple, the total hydraulic retention time is less than other similar processes, and no additional carbon source is required. The anoxic and anaerobic sections only perform slow stirring to save energy consumption. The disadvantage is that the phosphorus and nitrogen removal effects cannot meet the ideal requirements. Long hydraulic retention time, low back pressure rate, large investment per ton, long sludge age, high operating costs, sewage reuse requires further treatment, and equipment cannot be integrated

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