Capacity expansion system for sewage treatment plant

Abstract

A capacity expansion system for a sewage treatment plant, comprising a pretreatment tank (1), a biochemical tank (2), a secondary sedimentation tank (3), a first deep treatment tank (4), and a disinfection tank (5). An MBR curtain type membrane (6) is provided in the biochemical tank (2), and a water outlet pipe of the MBR curtain type membrane (6) is communicated with the disinfection tank (5). The biochemical tank (2) is an oxidation ditch. The MBR process and the oxidation ditch process are effectively combined, there is no need to add a treatment unit having a large size, the advantage of endless circulation of the oxidation ditch is fully exerted, and the risk of MBR membrane clogging is reduced, thereby improving the treatment efficiency of a system, and reducing the operation and maintenance cost.

Description

A sewage treatment plant expansion system Technical Field

[0001] The utility model relates to the field of sewage, in particular to a sewage treatment plant expansion system. Background Art

[0002] The expansion of a sewage treatment plant means that the water treatment volume of the existing sewage treatment plant has reached the original designed water volume, but the water intake is still increasing, and the capacity of the existing treatment equipment can no longer meet the requirements, requiring technical transformation and expansion.

[0003] Building a new sewage treatment plant or expanding the capacity of an existing municipal sewage treatment plant. The former is technically simpler but economically expensive. The latter fully utilizes existing equipment, taps potential through renovation, and adopts new advanced technologies, minimizing the need for new treatment equipment and reducing construction and operating costs. This is economically sound and should be the preferred option. However, due to various limitations of existing sewage treatment plants, particularly the limited land area of ​​the original sewage treatment plant, expansion presents significant challenges.

[0004] Patent No. "200510096196.X" discloses a "method for expanding the capacity of a sewage treatment plant using an A / O type biological aeration filter." However, this patent still requires the addition of an A / O type biological aeration filter behind the outlet section of the secondary sedimentation tank. Therefore, this method is not feasible when the sewage treatment plant does not have room for expansion. Utility Model Content

[0005] The purpose of the utility model is to provide a sewage treatment plant expansion system.

[0006] The innovation of this utility model is that it does not need to add large-scale equipment outside the existing equipment, and the existing sewage treatment plant does not need to stop production. It effectively combines the MBR process with the oxidation ditch process, does not need to add a large-scale treatment unit, and gives full play to the advantage of the oxidation ditch without terminal circulation, reduces the risk of MBR membrane clogging, thereby improving the system treatment efficiency and reducing operation and maintenance costs.

[0007] In order to achieve the above-mentioned purpose of the utility model, the technical solution of the utility model is: a sewage treatment plant expansion system, including a pretreatment tank, a biochemical tank, a secondary sedimentation tank, a No. 1 deep treatment tank, and a disinfection tank. The biochemical tank is equipped with an MBR curtain membrane, and the outlet pipe of the MBR curtain membrane is connected to the disinfection tank.

[0008] Furthermore, a second deep treatment tank is provided between the MBR curtain membrane water outlet and the disinfection tank water inlet.

[0009] Furthermore, the biochemical pool is an oxidation ditch. The MBR curtain membrane and the oxidation ditch are used in combination. Since there is an aeration structure under the MBR curtain membrane, the curtain membrane is always shaking and is not easy to be blocked. In addition, since the curtain membrane is looser than the flat membrane, the sludge is not easy to clump.

[0010] Furthermore, the pretreatment tank is a cyclone sand settling tank.

[0011] Furthermore, the No. 1 deep treatment tank and the No. 2 deep treatment tank are both magnetic coagulation sedimentation tanks.

[0012] Furthermore, a sand filter tank is provided between the No. 1 deep treatment tank and the disinfection tank.

[0013] The beneficial effects of the utility model are:

[0014] 1. The expansion and reconstruction structure in the present invention does not require the sewage treatment plant to stop production and will not affect the economic benefits of the existing sewage treatment plant.

[0015] 2. In the utility model, there is no need to increase the floor space outside the existing sewage equipment. It is only necessary to set up an MBR curtain membrane in the biochemical pool, which effectively combines the MBR process with the oxidation ditch process. There is no need to add a large-sized treatment unit, and the advantage of the oxidation ditch without terminal circulation is fully utilized, which reduces the risk of MBR membrane clogging, thereby improving the system treatment efficiency and reducing operation and maintenance costs.

[0016] 3. The amount of civil engineering in this utility model is small, so the construction period is greatly shortened, the installation is convenient, and the flexibility is high, saving investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic structural diagram of the present utility model. Implementation Method

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0019] Example 1: A sewage treatment plant expansion system includes a pretreatment tank 1, a biochemical tank 2, a secondary sedimentation tank 3, a No. 1 deep treatment tank 4, and a disinfection tank 5. The pretreatment tank 1 is a cyclone grit chamber, and the biochemical tank 2 is an oxidation ditch. An MBR curtain membrane 6 is provided within the biochemical tank 2, and the outlet pipe of the MBR curtain membrane 6 is connected to the disinfection tank 5. A No. 2 deep treatment tank 7 is provided between the outlet of the MBR curtain membrane 6 and the inlet of the disinfection tank 5. Both the No. 1 deep treatment tank 4 and the No. 2 deep treatment tank 7 are magnetic coagulation sedimentation tanks. A sand filter 8 is also provided between the No. 1 deep treatment tank 4 and the disinfection tank 5.

[0020] During operation, in addition to the conventional water outlet route, there is an additional branch water outlet route from the MBR curtain membrane 6 in the biochemical pool 2; the original system and the new system operate in parallel.

[0021] The embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A sewage treatment plant expansion system, comprising a pretreatment tank, a biochemical tank, a secondary sedimentation tank, a No. 1 deep treatment tank, and a disinfection tank, characterized in that: An MBR curtain membrane is arranged in the biochemical pool, and a water outlet pipe of the MBR curtain membrane is connected with the disinfection pool.

2. The sewage treatment plant expansion system according to claim 1, characterized in that: A second deep treatment tank is provided between the MBR curtain membrane water outlet and the disinfection tank water inlet.

3. The sewage treatment plant expansion system according to claim 1, characterized in that: The biochemical pool is an oxidation ditch.

4. The sewage treatment plant expansion system according to claim 1, characterized in that: The pretreatment tank is a cyclone sand settling tank.

5. The sewage treatment plant expansion system according to claim 2, characterized in that: The No. 1 deep treatment tank and the No. 2 deep treatment tank are both magnetic coagulation sedimentation tanks.

6. The sewage treatment plant expansion system according to claim 1, characterized in that: A sand filter tank is also provided between the No. 1 deep treatment tank and the disinfection tank.

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