Sewage treatment device and treatment method thereof for large-scale sewage treatment station

Abstract

The invention discloses a sewage treatment device for a large-scale sewage treatment station. The sewage treatment device comprises a filtering device, a regulating hydrolysis tank, a grade-A biochemical tank, a grade-O biochemical tank, a precipitation tank, an improved coagulation system, a disinfection tank, a sludge thickening tank, oxygenation equipment and a gas stripping device, wherein the filtering device, the regulating hydrolysis tank, the grade-A biochemical tank, the grade-O biochemical tank, the precipitation tank, the improved coagulation system and the disinfection tank are connected with one another in sequence from front to back; the gas stripping device is a pulse gas stripping device which is used for stripping one part of sludge precipitated in the precipitation tank into the sludge thickening tank, and the other part of the sludge precipitated in the precipitation tank into the grade-A biochemical tank; the grade-O biochemical tank is provided with the oxygenation equipment which is a centrifugal blower. The invention also provides a sewage treatment method for the large-scale sewage treatment station. The sewage treatment device disclosed by the invention has the advantages of being full in filtration and high in treatment efficiency of precipitated sludge, saving the floor area, and having an integrated function of regulation and decomposition.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage treatment device of a large sewage treatment station and a treatment method thereof. Background technique [0002] The sewage treatment method under the prior art mainly contains following several kinds: [0003] 1. Pollution blocking facilities [0004] The solid impurity content in the raw water of this project is relatively high. In order to ensure the normal operation of the lifting pump and other equipment and the normal operation of the subsequent treatment structures, it is planned to set up pollution control facilities in the front section of the main treatment process. [0005] 2. Biological treatment [0006] The usual sewage treatment station generally adopts the following biological treatment methods. [0007] A) biological contact oxidation method [0008] The biological contact oxidation method belongs to the biofilm method and has the followin...

AI Technical Summary

Problems solved by technology

[0016] 1) There should be enough soluble and easily degradable substances in the wastewater, as nutrients necessary for microbial physiological activities, the general activated sludge method must regularly add nutrients in a certain ratio, which increases operating costs and management difficulties;

[0017] 2) The mixed solution must contain enough dissolved oxygen, and the activated sludge concentration tank has aerobic protozoa, and the demand for oxygen is relatively large;

[0020] 5) The activated sludge has a long growth cycle and poor adaptability to sudden changes in temperature, water quality and water quantity;

[0022] 7) The treatment efficiency of activated sludge method is low, resulting in an increase in the volume of the facility, and a corresponding increase in civil construction investment

The setting of the hydrolysis tank, on the one hand, takes up a lot of space in the treatment station; on the other hand, it consumes manpower and material resources

[0028] 2) The solid waste filtered by the grid pool is easy to be brought into the conveying device, and the conveying device is stuck, causing the conveying device to not work normally; at the same time, it will also affect the filtration efficiency;

[0029] 3) The wall of the vertical flow sedimentation tank is constructed of reinforced concrete, and the surface is uneven, while the larger the gap between the lower end of the traditional sludge discharge pipe and the wall, the sludge deposited on the wall will be decomposed After floating on the liquid surface, causing secondary pollution;

[0030] 4) The sludge after precipitation is often dehydrated by quicklime and then incinerated, which has the disadvantages of high processing cost and environmental pollution

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