Double-circulation double-sedimentation-tank integrated biological treatment device and double-circulation double-sedimentation-tank integrated biological treatment method

Abstract

The invention belongs to the technical field of sewage treatment, and discloses a double-circulation double-sedimentation-tank integrated biological treatment device and method. The upper end of a first-stage aeration tank is communicated with a second-stage aeration tank through a channel opening formed in a partition plate; the right side of the second-stage aeration tank is an inclined wall surface, the first-stage sedimentation tank is arranged above the inclined wall surface of the second-stage aeration tank, and the second-stage sedimentation tank is arranged on the right side of the first-stage sedimentation tank; the bottom of the primary sedimentation tank is communicated with a first sludge return area, settled sludge returns to the secondary aeration tank, the lower end of the secondary sedimentation tank is communicated with a second sludge return area, and settled sludge returns to the first aeration tank. According to the invention, the removal efficiency of the reaction tanks is improved, the number of the reaction tanks is reduced, the occupied area of the reaction tanks is reduced, the electric energy consumption of stirring in the medium-oxygen and low-oxygen areas is reduced, the two-stage aeration tank has stronger adaptive capacity to inlet water, the utilization efficiency of oxygen and the nitrogen and phosphorus removal capacity are improved, the sludge yield can be reduced by decomposing activated sludge through the two-stage aeration tank, and the energy consumption is reduced. The operation management cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an integrated biological treatment device and method of double circulation and double sedimentation tanks. Background technique [0002] At present, the demand for sewage treatment in townships is increasing year by year: With the acceleration of urbanization in China, the total population and unit density of townships are increasing year by year. This change promotes the development of township economy and also leads to an increase in the output of domestic sewage and industrial wastewater in townships. In stark contrast to the demand for sewage treatment, the current volume of sewage treatment in my country's townships is relatively low. The treatment rate of sewage in small towns in my country is only 10%. Establishing a complete township sewage treatment system has become an important development direction in the field of sewage treatment. [0003] Town...

AI Technical Summary

Problems solved by technology

[0006] Through the above analysis, the existing problems and defects of the existing technology are: most of the existing integrated devices for the biological treatment of township sewage are based on the original anaerobic pool, anoxic pool and aerobic pool, and a simple combination design is carried out. There are many structures and the operation is complicated

The effect of single-stage biological treatment is limited, and the impact resistance is insufficient, so it is difficult to meet the characteristic needs of township sewage water quality changes

A large amount of equipment investment consumes a lot of energy. For the weak economic foundation in rural areas, it is difficult to maintain for a long time

[0007] The existing township sewage treatment equipment has low nitrogen and phosphorus removal capabilities, weak ability to resist water quality fluctuations, high turbidity of effluent, and high operation and maintenance costs

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