CN110743212A - Efficient sludge discharge sedimentation tank - Google Patents

Abstract

The invention discloses a high-efficiency sludge discharge sedimentation tank, comprising a multi-layer sedimentation tank located on both sides and a central sludge removal tank. A bottom sludge scraper is arranged at the bottom of each layer of sedimentation tank. The bottom sludge is scraped to the central sludge discharge tank. The liquid level of the central sludge discharge tank is lower than that of the sedimentation tank to ensure that the water flow direction flows from the sedimentation tanks on both sides to the central sludge discharge tank. The supernatant liquid return pipe is set above the sludge discharge tank to return to the sedimentation tank. The pool is filled with water, a concentrated sludge scraping device is set at the bottom of the sludge discharge tank, and a sludge discharge pipe is set below the sludge discharge tank to connect to the sludge dewatering device. The invention is mainly used in the water treatment sedimentation process. The sludge discharge path and frequency of the sedimentation tank are shortened by lateral sludge discharge. Combined with the supernatant liquid return system in the sludge discharge area, automatic and continuous hydraulic sludge discharge can be realized, and the separation of mud and water can be quickly realized, which is conducive to improving the Sedimentation efficiency and sediment concentration.

Description

A high-efficiency sludge sedimentation tank

technical field

The invention relates to a high-efficiency sludge discharge sedimentation tank. The system is mainly used in the water treatment sedimentation process. By setting a sludge discharge area in the center of the multi-layer sedimentation tank, the efficiency of the sludge discharge system can be improved, and the subsequent sludge treatment process can be simplified, saving the floor space and engineering construction costs.

Background technique

The sedimentation tank is a large-scale structure in the water treatment plant, and the multi-layer sedimentation tank saves the area of the sedimentation tank by improving the sedimentation efficiency per unit area, and is widely used. According to the "shallow pond theory", once the sediment in the sedimentation tank has settled to the bottom of the tank, it can be removed by the sedimentation process. However, in actual operation, it is found that if the sludge that settles to the bottom of the tank cannot be removed in time, the sediment will accumulate more and more, which will eventually lead to the re-floating of the sediment and affect the treatment effect of the sedimentation process.

The number of layers in the traditional multi-layer sedimentation tank cannot be increased, mainly because of the limitation of the sludge discharge system. On the one hand, the traditional longitudinal sludge discharge leads to a long sludge discharge distance, and the distribution gap of the sediment in each area is too large. If the sludge discharge speed is too slow, the amount of sludge in the front section of the sedimentation tank will be too much. The sediment is disturbed and floated up. On the other hand, the traditional sediment discharge direction is opposite to the water flow direction, and the sediment needs to overcome the reverse movement of the water flow direction, which is easy to generate vortex flow and increase the probability of sediment floating. main factor.

In addition to the sedimentation tank itself affecting the water plant land, the subsequent sludge treatment process of the sedimentation process also greatly affects the water plant land. Usually, the sludge drainage water in the sedimentation process needs to be stored in the sludge drainage tank. In some processes, it is necessary to consider recycling the supernatant to save water resources. The sludge in the sludge drainage tank or recovery tank is then lifted to the concentration tank, and then discharged to the balance tank after being concentrated. Dehydration through the dehydration room. The above sludge treatment process not only greatly occupies land resources, but also increases the energy consumption of sludge water treatment and indirectly increases the cost of water production.

In order to solve this problem, it is necessary to study a high-efficiency sludge discharge process. By building the sludge discharge tank together with the multi-layer sedimentation tank, the sludge discharge system of the sedimentation tank and the subsequent sludge treatment process are simplified, thereby saving the water plant as a whole. The overall floor space and construction costs are reduced, and the cost of water production is reduced.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a high-efficiency sludge discharge sedimentation tank, which simplifies the sludge discharge system of the sedimentation tank and the subsequent sludge treatment process by building the sludge discharge tank together with the multi-layer sedimentation tank, and saves the overall floor space and cost of the water plant. Construction costs are reduced, and water production costs are reduced.

In order to achieve the above-mentioned purpose, the technical scheme of the present invention is: a high-efficiency sludge discharge sedimentation tank, including a multi-layer sedimentation tank and a central sludge discharge tank located on both sides, and a bottom sludge scraper is provided at the bottom of each layer of sedimentation tank. The mud machine scrapes the bottom mud of the multi-layer sedimentation tanks on both sides to the central sludge discharge tank. The liquid level of the central sludge discharge tank is lower than that of the sedimentation tank to ensure that the water flow direction flows from the two sides of the sedimentation tanks to the central sludge discharge tank. The supernatant return pipe is returned to the sedimentation tank inlet water, a concentrated sludge scraping device is set at the bottom of the sludge discharge tank, and a sludge discharge pipe is set below the sludge discharge tank to connect to the sludge dewatering device.

Further, a partition wall is used to separate the sedimentation zone and the sludge discharge zone.

Further, a backflow prevention device is provided on the side of the mud scraper close to the central mud discharge tank to prevent the backflow of sludge from the mud discharge area to the sedimentation areas of each layer.

Further, the inner side of the multi-layer sedimentation tank is provided with a partition wall, and the bottom of the partition wall is provided with a communication port with a height of 0.3 to 0.5 meters. The device is a rubber isolation brush arranged at the communication port of the partition wall and matched with the mud scraper, which is used to completely remove the sludge attached to the mud scraper.

Further, a mud collecting pit is set at the end of the central sludge discharge tank, and the depth of the mud collecting pit should be greater than 2m, the main purpose is to increase the sludge concentration.

Further, the scrapers are arranged side by side, and the running speed of the scrapers is adjusted according to the sludge accumulation in the sedimentation tank, so that the scraper at the inlet runs fast and the scraper at the outlet runs slowly.

Further, in the multi-layer sedimentation tank with each layer in parallel, the mud scraper can be driven in a unified manner at the same position, and the same mud scraping speed can be adopted for each layer of sedimentation zone at the same position, which is convenient for control and management.

The high-efficiency sludge discharge sedimentation tank of the present invention utilizes the liquid level difference between the sedimentation tank and the sludge discharge tank to realize full gravity sludge discharge without any lifting device, saves energy consumption, and can save the sludge discharge tank, recovery tank, concentration tank, Sludge treatment structures such as balance tanks. The sedimentation tank of each layer shares the sludge discharge area, which improves the sludge discharge efficiency and saves the floor space. At the same time, the use of supernatant discharge measures not only shortens the distance of supernatant backflow, but also uses supernatant backflow to realize the positive hydraulic flow state of the mud inlet at the bottom of the sludge discharge tank, preventing the sludge in the sludge discharge tank from entering the sedimentation tank again. .

Description of drawings

Figure 1 is a plan view of a new type of high-efficiency sludge sedimentation tank.

Figure 2 is a cross-sectional view A-A of a new type of high-efficiency sludge sedimentation tank.

Figure 3 is a B-B sectional view of a new type of high-efficiency sludge sedimentation tank.

Figure 4 is a C-C sectional view of a new type of high-efficiency sludge discharge sedimentation tank.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

This embodiment of the present invention is a novel high-efficiency sludge discharge sedimentation tank, which is mainly composed of a multi-layer sedimentation tank and a central sludge removal tank.

The multi-layer sedimentation tanks are arranged on both sides, and the center is separated by a sludge discharge tank. Each sedimentation area of the multi-layer sedimentation tank adopts a bottom scraper. The scraper can be reciprocating, chain or other types, but the scraping direction is to scrape the sludge from both sides to the middle, and finally scrape the bottom sludge to the central sludge discharge tank. Since the function of the central sludge discharge area is to receive the bottom sludge of each layer, the sludge discharge process of each layer of sedimentation tanks does not affect the normal operation of other layers of sedimentation tanks.

As shown in the figure, the central sludge discharge tank and the multi-layer sedimentation tanks on both sides of the present invention are a combined tank, and the sludge discharge tank is located in the middle of the two sedimentation tanks, and adopts a unified floor structure with the two sedimentation tanks. The width of the sludge discharge tank is 2 to 6 meters, and the inner bottom elevation of the sludge removal tank must be at least 2 to 4 meters lower than the inner elevation of the sedimentation tank. A mud scraper is used at the bottom of the sludge discharge tank to scrape the sludge to the sludge collection pit at the terminal of the sludge discharge tank, and finally discharge it into the subsequent sludge treatment facilities. The top of the sludge discharge tank adopts a perforated pipe or an outlet weir, etc., to discharge the supernatant or lift the supernatant through a lift pump and return it to the water inlet pipe of the sedimentation tank.

The sludge scraper 1 in the sedimentation area is laid at the bottom of each layer of sedimentation tank. The length of the sludge scraper is the same as the width of the sedimentation tank. The width of the sludge scraper is usually 10 meters to 20 meters, which should be determined according to the total length of the sedimentation tank and the number of sludge scrapers. The mud scraper 1 can adopt various forms such as chain type or reciprocating type.

The main function of the sludge scraper 2 in the sludge discharge area is to concentrate and scrape the sludge accumulated at the bottom of the sludge discharge area to the sludge collection area of the sludge discharge area, and finally discharge it into the sludge dewatering system.

The supernatant discharge system 3 adopts perforated pipe, and can also use other water outlet forms such as outlet weirs. The water surface level in the sludge discharge area is lower than the water surface level in the sedimentation area, so that the direction of water flow between the sedimentation tank and the sludge discharge tank will always flow to the sludge discharge tank, so as to avoid the sludge from the sludge discharge tank returning to the sedimentation tank and causing the bottom sludge to float.

The sludge discharge pipe 4 uses an electric flow regulating valve to control the sludge discharge speed, and a sludge concentration meter is installed. When the concentration is lower than 1%, the sludge discharge is stopped.

The mud collecting pit 5 is the end of the central mud discharging pool, and the depth of the pit should be greater than 2m. The main purpose is to increase the sludge concentration.

The inner side of the multi-layer sedimentation tank is provided with a partition wall, and the bottom of the partition wall has a communication port with a height of 0.3 to 0.5 meters.

The anti-return device 6 is a rubber isolation brush arranged at the communication port of the partition wall and matched with the scraper. It is used to completely remove the sludge attached to the scraper and prevent the discharged sludge from returning to the sedimentation area again. , affecting the precipitation effect. The backflow prevention device 6 also has the function of cleaning the mud scraper 1 to avoid the sludge adsorption caused by the long-term operation of the mud scraper 1 .

It is different from the existing technology in that:

1. Compared with the separate construction of the traditional multi-layer sedimentation tank and the sludge discharge tank, the present invention adopts the form of the combined construction of the multi-layer sedimentation tank and the sludge discharge tank, which shortens the distance of sludge discharge and supernatant backflow, and reduces the overall water plant. The number of structures saves floor space.

2. Compared with the traditional multi-layer sedimentation tank discharging method, the present invention adopts an independent sludge discharging area, which avoids the influence on other layers of sedimentation tanks during the sludge discharging process of each layer of sedimentation tanks, and also greatly improves the space utilization rate. Both layers of sedimentation tanks can share the sludge discharge area, which saves land, improves the effect of sludge adsorption and sweeping, and improves the sediment concentration effect in the sludge discharge area.

3. Compared with the vertical scraping method of the traditional advection sedimentation tank, the sedimentation tank on both sides of the present invention adopts the method of scraping the sludge from both sides to the center, which can greatly shorten the scraping stroke and reduce the sediment retention time.

4. Compared with the constant-speed mud scraping method of the advection sedimentation tank, the present invention can set up multiple mud scrapers in the length direction of the sedimentation tank. The machine runs slowly. This variable-speed mud scraping method adapts to the characteristics of more sludge at the entrance of the sedimentation tank and less sludge at the exit. On the one hand, a large amount of sludge at the entrance can be scraped off in time by the fast operation of the mud scraper at the entrance, and on the other hand, the slow operation of the mud scraper at the outlet can prevent the mud scraping speed from being too fast and disturbing the light and small flocs at the bottom to float again. Since the present invention adopts the parallel connection mode of each layer of sedimentation tanks, and under the condition that the water inlet end is uniform, the amount of sediment in the upper and lower layers of sedimentation tanks is very close, and the upper and lower layers of sedimentation tanks can share the mud scraper, that is, the sedimentation layers in the same position The pool adopts the same scraping speed to reduce the difficulty of control.

5. Compared with the traditional advection sedimentation tank discharging method, the present invention makes full use of the liquid level difference in the sedimentation tank, and the sludge water in the sludge discharging tank does not need to be lifted by a pump, and can directly rely on the higher liquid level in the sludge discharging tank to realize gravity sludge discharge, saving energy. energy consumption.

6. Compared with the traditional advection sedimentation tank, the liquid level difference between the sedimentation area and the sludge discharge area of the present invention is very small, and the energy consumption of the supernatant liquid backflow is extremely low, so the supernatant liquid backflow can be realized with a large flow. This is beneficial to improve the floc removal efficiency. On the one hand, the large flocs are discharged into the sludge discharge area for concentration as soon as possible, and on the other hand, the small flocs are re-flocculated through the backflow of the supernatant to form large flocs.

7. Compared with the traditional advection sedimentation tank, the present invention realizes the rapid separation of the bottom sludge and the precipitation raw water, and the supernatant liquid is refluxed at the same time. The measures such as the discharge of sludge water also ensure that the communication port from the sedimentation tank to the sludge discharge tank is always in the state of positive flow of water, which eliminates the unfavorable phenomenon of the bottom sludge from the sludge discharge tank returning to the sedimentation tank and causing the bottom sludge to float. This feature also avoids the situation that the sludge discharged from the upper sedimentation tank may flow back to the lower sedimentation tank.

Claims (6)

1. The utility model provides a high-efficient row's mud sedimentation tank, is including the multilayer sedimentation tank and the central row's mud pond that are located both sides, and every layer of sedimentation tank bottom all establishes the bottom and scrapes the mud machine, scrapes the mud pond to central row with both sides multilayer sedimentation tank bottom mud through the bottom, central row's mud pond liquid level is less than the sedimentation tank, guarantees the rivers direction by both sides sedimentation tank flow direction central row's mud pond, row's mud pond top sets up the supernatant back flow and flows back to the sedimentation tank and intake, row's mud bottom of the pool portion sets up the concentrated mud device of scraping, row's mud pond below sets up row's mud union coupling to sludge dewatering device.

2. The high-efficiency sludge discharge sedimentation tank as claimed in claim 1, wherein the sedimentation zone and the sludge discharge zone are separated by a partition wall.

3. The efficient sludge discharging and settling tank as claimed in claim 1, wherein a backflow preventing device is disposed on one side of the sludge scraper close to the central sludge discharging tank to prevent sludge in the sludge discharging zone from flowing back to each settling zone.

4. A high efficiency sludge discharging and settling pond as claimed in claim 3, wherein a partition wall is provided inside the multi-layer settling pond, the bottom of the partition wall has a communication opening, the height of the partition wall is 0.3 m to 0.5 m, bottom sludge scraped by the sludge scraper falls from the communication opening to the sludge discharging area, the backflow preventing device is a rubber isolation brush provided at the communication opening of the partition wall and cooperating with the sludge scraper for thoroughly removing sludge attached to the sludge scraper.

5. The efficient sludge discharging and settling pond as claimed in claim 1, wherein a sludge collecting pit is arranged at the end of the central sludge discharging pond, and the depth of the sludge collecting pit is greater than 2 m.

6. The efficient sludge discharging sedimentation tank as claimed in claim 1, wherein the sludge scrapers are arranged side by side, and the operation speed of the sludge scrapers is adjusted according to the sludge accumulation condition of the sedimentation tank, so that the operation speed of the sludge scrapers at the inlet is high, and the operation speed of the sludge scrapers at the outlet is low.

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