CN204601712U - Sedimentation basin - Google Patents

Abstract

The utility model provides a sedimentation tank, which comprises a sedimentation tank body and a sludge pump. The walls of the sedimentation tank body are respectively provided with a water inlet and a water outlet. The upper part of the sedimentation tank is a clear water area, and the lower part is a buffer zone. In the sedimentation area, a number of vertically parallel inclined plates are arranged between the clear water area and the buffer sedimentation area; the sludge pump is arranged in the buffer sedimentation area, and the sludge pump is connected with a sludge The sludge pump discharges the sludge deposited in the buffer sedimentation area through the sludge pipe. The sedimentation tank provided by the utility model has good sealing performance, strong adaptability to various ground conditions, acid and alkali resistance, oxidation resistance, no deformation under high temperature and high pressure, fast construction speed, low cost and convenient installation, low energy consumption and long service life.

Description

Sedimentation tank

technical field

The utility model relates to the field of environmental protection water treatment, in particular to a sedimentation tank.

Background technique

China currently has a rural population of about 674 million, more than 2.5 million natural villages, and a daily sewage discharge of more than 30 million tons, accounting for more than 50% of the country's water pollutant discharge. From 2006 to 2013, the national urban sewage treatment rate increased from 55.7% to 99.1%, which is now close to saturation; the county sewage treatment rate increased from 13.6% to 82.6%, and the sewage treatment rate has increased significantly. At present, the village sewage treatment rate is only 7.0%, and only a few developed provinces and cities such as Beijing, Tianjin, Shanghai, Jiangsu, Zhejiang, Guangdong and other rural domestic sewage treatment ratios can reach about 10%; Shanghai reaches 43%, the highest in the country; Most of the other provinces have not fully rolled out, and only conducted pilot projects in some villages and towns.

The "Water Pollution Prevention and Control Action Plan" ("Water Ten Measures") has been issued. According to estimates, the investment demand for the implementation of the "Water Ten Measures" will reach 2 trillion yuan. The investment will involve new construction of sewage treatment facilities, upgrading of existing sewage treatment plants, pipeline network construction and sewage treatment in villages and towns, which are also the key areas of domestic sewage treatment. The rural sewage treatment market will usher in "big opportunities + big challenges". It is predicted that in 2015, my country's rural sewage discharge will be about 14.8 billion tons. Assuming that the treatment rate reaches 20%, the potential market size of rural sewage treatment in 2015 can reach 40.8 billion yuan (excluding the operating market size after the completion of the facilities). The market potential of rural sewage treatment is huge.

Disadvantages of commonly used activated sludge treatment process: large area, complex operation, high investment, high energy consumption, high sludge output, poor effluent quality, low nitrogen and phosphorus removal rate.

Constructed wetlands, stabilizing ponds, and land treatment systems have low construction costs, low energy consumption during operation, and simple management. While protecting the environment, they can improve local landscapes and are suitable for new rural construction. However, there are disadvantages such as unstable effluent quality, large treatment effect affected by the environment, long residence time of sewage, and large land occupation. It is only suitable for rural areas with suitable climate and a large number of low-lying land and idle land.

According to the characteristics of village and town sewage and the country's requirements for building a new type of ecological civilization, the process suitable for my country's village and town sewage treatment should have strong impact load resistance and high removal efficiency; the process is simple and flexible, stable in operation, and convenient in maintenance and management; infrastructure investment Province, low operating costs, obvious energy saving and consumption reduction; it can better adapt to the current standard treatment emission requirements and the changes in the future consideration of recycling needs. In the "Guidelines for the Construction and Investment of Rural Domestic Sewage Treatment Projects" issued by the Ministry of Environmental Protection in November 2013, the treatment processes recommended for rural sewage decentralized treatment projects: small artificial wetlands, land treatment, stabilization ponds, purification biogas digesters, integrated sewage treatment device.

The main problems in my country's sewage treatment are: the relatively lagging pipeline network, the phenomenon of heavy water and light mud is common, the upgrading and transformation are very urgent, the degree of sewage recycling is low, the construction and operation management of sewage treatment plants still needs to be strengthened, and the sewage treatment work has not yet been carried out on a large scale. carry out.

With the rapid increase of my country's population, the demand for water is increasing rapidly. In order to adapt to my country's national conditions, the scale of sewage treatment has developed from large-scale centralized to small and medium-sized decentralized, forming a situation of "mainly large-scale, supplemented by small and medium-sized". This provides a new opportunity for the application and development of integrated water treatment equipment.

Utility model content

In view of this, the purpose of this utility model is to overcome the deficiencies of the prior art and provide a settling tank that can be used alone or freely combined with other sewage treatment devices.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a sedimentation tank, including a sedimentation tank body and a sludge pump, the wall of the sedimentation tank body is respectively provided with a water inlet and a water outlet, the upper layer of the sedimentation tank Part of it is a clear water area, and the lower part is a buffer sedimentation area. There are several vertically parallel inclined plates arranged between the clear water area and the buffer sedimentation area; the sludge pump is set in the buffer sedimentation area. A sludge pipe is connected to the sludge pump, and the sludge pump discharges the sludge deposited in the buffer and sedimentation area through the sludge pipe.

The sedimentation tank also includes a water inlet pipe, the water inlet pipe is arranged in the body of the sedimentation tank, one end of which communicates with the water inlet, and the other end extends downward to the bottom of the inclined plate.

The cross section of the buffer sedimentation area is V-shaped, and the sludge pump is arranged at the bottom of the V-shaped buffer sedimentation area.

On the pool wall of the clear water area where the water outlet is set, the water outlet is a height-adjustable water outlet weir.

The cross section of the sedimentation tank is circular or oval.

The sedimentation tank body is made of acid and alkali resistant materials.

The acid and alkali resistant material is glass fiber or polypropylene.

The top of the sedimentation tank body is provided with an observation port.

The sedimentation tank body is buried underground.

The settling tank is also equipped with anaerobic biological treatment device and aerobic biological treatment device, and the sludge in the buffer sedimentation area is pumped back to the anaerobic biological treatment device and/or aerobic biological treatment device through the sludge pump. Processing device.

The utility model adopts the above technical scheme, the upper part of the sedimentation tank is a clear water area, and the lower part is a buffer sedimentation area, and several vertically parallel inclined plates are arranged between the clear water area and the buffer sedimentation area; at the same time The sludge pump is arranged in the buffer sedimentation area, and the sludge pump discharges the sludge deposited in the buffer sedimentation area through the sludge pipe. The sedimentation tank provided by the utility model has good sealing performance, strong adaptability to various ground conditions, acid and alkali resistance, oxidation resistance, high and low temperature without deformation, and long service life.

The utility model also has the following advantages:

1) The sedimentation tank is small in size, saves land space, flexible in transportation, saves construction costs, and has low noise during equipment operation. It can be buried in the ground and occupies very little surface area. Influence the reuse of land resources and achieve the perfect combination of equipment and surrounding human settlements;

2) The shape of the sedimentation tank adopts a cylindrical design, which has good compression and deformation resistance; the cross-section design is oval, which can greatly improve the flow state of sewage, reduce short flow and dead angle areas in the process of sewage treatment, and effectively improve the purification of sewage Effect.

3) The sedimentation tank adopts an industrialized modular production method to realize batch, large-scale and standardized production. The production cycle of the equipment is short, and the product quality can be effectively controlled. The on-site installation and construction of the equipment can achieve a short standardized operation cycle and can be put into use quickly; the initial one-time investment is small and the operating cost is low.

4) The settling tank is equipped with a sloping plate, which greatly reduces the time of activated sludge settling and improves the settling efficiency.

5) The outlet weir of the sedimentation tank adopts a combination of a triangular weir and a small circular water outlet hole at the lower part. The discharged clear water has high clarity, uniform and stable outlet water, and there is no sludge run-off phenomenon.

Description of drawings

Fig. 1 is the structural representation of the utility model sedimentation tank;

Fig. 2 is a schematic diagram of the outlet weir structure of the sedimentation tank of the present invention.

In the figure: 1. Water inlet; 2. Return sludge pipeline; 3. Inclined plate; 4. Sludge pump; 5. Water outlet; 6. Sludge discharge pipe; 7. Clear water area; 9. Sludge area; 10. Triangular weir; 11. Outlet weir plate; 12. Outlet hole; 13. Inlet pipe; 14. Observation port.

Detailed ways

As shown in Figure 1, the utility model provides a kind of sedimentation tank, comprising a sedimentation tank body and a sludge pump 4, the wall of the sedimentation tank body is respectively provided with a water inlet 1 and a water outlet 5, on the sedimentation tank The layer part is a clear water area 7, the lower part is a buffer sedimentation area 8, and the bottom part is a sludge area 9, and several vertically parallel inclined plates 3 are arranged between the clear water area 7 and the buffer sedimentation area 8; The sludge pump 4 is arranged in the buffer sedimentation area 8, and a sludge pipe is connected to the sludge pump 4, and the sludge pump 4 discharges the sludge deposited in the buffer sedimentation area through the sludge pipe.

It should be noted that the buffer sedimentation zone 8 described in the utility model includes the sludge zone 9 , therefore, the sludge pump 4 can also be arranged in the sludge zone 9 at the bottom.

It should be noted that the sludge pipe is branched into a return sludge pipeline 2 and a sludge discharge pipeline 6, the sludge passing through the sludge discharge pipeline 6 is directly discharged, and the sludge passing through the return sludge pipeline 2 The mud is pumped back to the aerobic biological treatment device (not shown in the figure) which is provided in a matching manner.

The sedimentation tank provided in this embodiment also includes a frame (not shown in the figure), which is fixed inside the sedimentation tank and is used for installing inclined plates 4 arranged in parallel vertically.

The sedimentation tank also includes a water inlet pipe 13 , the water inlet pipe 13 is arranged in the body of the sedimentation tank, one end of which communicates with the water inlet 1 , and the other end extends downward to the bottom of the inclined plate 3 .

In this embodiment, the high-efficiency sedimentation tank has the integrated function of coagulation-flocculation-sedimentation, and the biochemical effluent flows into the high-efficiency sedimentation tank through the central pipe by itself, and the flow rate of the central pipe inlet water is not greater than 30mm/s.

The cross section of the buffer sedimentation area is V-shaped, and the sludge pump 4 is arranged at the bottom of the V-shaped buffer sedimentation area. The cross section of the sedimentation tank is circular or oval.

On the pool wall of the clear water area 7 where the water outlet 5 is set, the water outlet 5 is a water outlet weir with adjustable height. The clear liquid in the clear water area enters the MBR membrane biological reaction tank through the triangular outlet weir for advanced treatment.

MBR (Membrane Bio-Reactor) is a new type of wastewater treatment system that organically combines membrane separation technology and biological treatment technology.

As shown in Figure 2, the height-adjustable water outlet weir includes a triangular weir 10, a water outlet weir plate 11 and a water outlet hole 12;

The body of the sedimentation tank described in this embodiment is made of acid and alkali resistant materials. The acid and alkali resistant material is glass fiber or polypropylene. An observation port 14 is provided on the top of the sedimentation tank body. The sedimentation tank body is buried underground.

The settling tank is also equipped with anaerobic biological treatment device and aerobic biological treatment device, and the sludge in the buffer sedimentation area is pumped back to the anaerobic biological treatment device and/or aerobic biological treatment device through the sludge pump 4. Biological treatment unit. It should be noted that the sewage treated by the aerobic biological treatment device flows into the sedimentation tank by itself through the water outlet 5 . In order to maintain the concentration of microorganisms in the reactor, the purpose of dephosphorization and denitrification can be achieved at the same time. The remaining activated sludge can be composted or reused as bacteria. The quality of the clarified effluent from the sedimentation tank has continuously and stably reached the national urban sewage discharge standard.

The utility model is not limited to the above-mentioned best implementation mode, anyone can draw other various forms of products under the enlightenment of the utility model, but no matter make any changes in its shape or structure, all have the same features as the application Or similar technical schemes all fall within the protection scope of the present utility model.

Claims (10)

1. A settling tank, characterized in that: comprise a settling tank body and a sludge pump, the wall of the settling tank body is respectively provided with a water inlet and a water outlet, the upper part of the settling tank is a clear water area, and the lower part In order to buffer the sedimentation area, several inclined plates arranged in parallel vertically are arranged between the clear water area and the buffer sedimentation area; the sludge pump is arranged in the buffer sedimentation area, and the sludge pump is connected with A sludge pipe, through which the sludge pump discharges the sludge deposited in the buffer sedimentation area. 2. A kind of sedimentation tank according to claim 1, characterized in that: the sedimentation tank also includes a water inlet pipe, the water inlet pipe is arranged in the sedimentation tank body, and one end thereof communicates with the water inlet, The other end extends downward to below the inclined plate. 3. A sedimentation tank according to claim 1, characterized in that: the cross section of the buffer sedimentation area is V-shaped, and the sludge pump is arranged at the bottom of the V-shaped buffer sedimentation area. 4. A sedimentation tank according to claim 1, characterized in that: the water outlet is set on the wall of the clear water area, and the water outlet is a height-adjustable outlet weir. 5. A sedimentation tank according to claim 1, characterized in that: the cross section of the sedimentation tank is circular or elliptical. 6. A sedimentation tank according to any one of claims 1 to 5, characterized in that: the body of the sedimentation tank is made of acid and alkali resistant materials. 7. A sedimentation tank according to claim 6, characterized in that: said acid and alkali resistant material is glass fiber or polypropylene. 8. A sedimentation tank according to any one of claims 1 to 5, characterized in that: the top of the sedimentation tank body is provided with an observation port. 9. A sedimentation tank according to any one of claims 1 to 5, characterized in that the body of the sedimentation tank is buried underground. 10. A sedimentation tank according to any one of claims 1 to 5, characterized in that: the sedimentation tank is also equipped with an anaerobic biological treatment device and an aerobic biological treatment device, and through the sludge pump The sludge in the buffer sedimentation area is pumped back to the anaerobic biological treatment device and/or the aerobic biological treatment device.