CN110743212A

CN110743212A - Efficient sludge discharge sedimentation tank

Info

Publication number: CN110743212A
Application number: CN201911054850.9A
Authority: CN
Inventors: 周易
Original assignee: Shanghai Water Design Engineering Co Ltd
Current assignee: Shanghai Water Design Engineering Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-02-04

Abstract

The invention discloses a high-efficiency sludge discharge sedimentation tank which comprises a plurality of layers of sedimentation tanks and a central sludge discharge tank, wherein the sedimentation tanks are positioned on two sides, a bottom sludge scraper is arranged at the bottom of each layer of sedimentation tank, the bottom sludge of the plurality of layers of sedimentation tanks on the two sides is scraped to the central sludge discharge tank through the bottom sludge scraper, the liquid level of the central sludge discharge tank is lower than that of the sedimentation tank, the water flow direction is ensured to flow from the sedimentation tanks on the two sides to the central sludge discharge tank, a supernatant backflow pipe is arranged above the sludge discharge tank and flows back to the sedimentation tank for water inlet, a concentrated sludge scraping device is arranged at the bottom of the sludge discharge tank, and a sludge discharge pipe is arranged below the sludge. The invention is mainly applied to a water treatment sedimentation process, shortens the sludge discharge path and frequency of the sedimentation tank by transversely discharging sludge, and can realize automatic and continuous hydraulic sludge discharge and quick sludge-water separation by combining a supernatant liquid reflux system in a sludge discharge area, thereby being beneficial to improving the sedimentation efficiency and the bottom sludge concentration effect.

Description

Efficient sludge discharge sedimentation tank

Technical Field

The invention relates to a high-efficiency sludge discharge sedimentation tank. The system is mainly applied to a water treatment sedimentation process, and can improve the efficiency of a sludge discharge system, simplify the subsequent sludge treatment process and save the occupied area and the engineering construction cost by arranging the sludge discharge area in the center of the multilayer sedimentation tank.

Background

The sedimentation tank is a large occupied area structure of a water treatment plant, and the multilayer sedimentation tank saves the occupied area of the sedimentation tank by improving the sedimentation efficiency of unit area, so that the application is wide. According to the "shallow pond theory", the sediment in the sedimentation tank can be removed by the sedimentation process once the sediment sinks to the bottom of the tank. However, in actual operation, if sludge deposited to the bottom of the tank cannot be removed in time, the more the sludge is deposited, the more the sludge floats up again, and the treatment effect of the precipitation process is affected.

The number of layers of the traditional multilayer sedimentation tank cannot be increased mainly due to the limitation of a sludge discharge system. On the one hand, the traditional vertical mud discharging results in the mud discharging distance being too long, the bottom mud distribution difference of each region is too large, the mud discharging speed is too slow, the front-section mud accumulation amount of the sedimentation tank is too much, and the mud discharging speed is too fast, so that the bottom mud at the rear section of the sedimentation tank is disturbed and floated. On the other hand, the traditional sludge discharge direction is opposite to the water flow direction, the bottom sludge needs to overcome the reverse movement of the water flow movement direction, the vortex flow is easy to generate, the floating probability of the bottom sludge is increased, and the main factor that the single-layer height of the multilayer sedimentation tank is generally not less than 2m is also limited.

Besides the influence of the sedimentation tank on the land of the water plant, the subsequent sludge treatment process of the sedimentation process also greatly influences the land of the water plant. In general, sludge water in a precipitation process needs to be stored in a sludge discharge tank, part of processes need to consider recovering supernatant so as to save water resources, bottom sludge of the sludge discharge tank or the recovery tank is lifted to a concentration tank, and the concentrated bottom sludge is discharged to a balance tank and finally dewatered by a dewatering machine room. The sludge treatment process not only greatly occupies land resources, but also increases the sludge water treatment energy consumption, and indirectly increases the water production cost.

In order to solve the problem, a high-efficiency sludge discharge process needs to be researched, and a sludge discharge system and a subsequent sludge treatment process of a sedimentation tank are simplified by building the sludge discharge tank and a multilayer sedimentation tank together, so that the total occupied area and the construction cost of a water plant are saved on the whole, and the water production cost is reduced.

Disclosure of Invention

The invention aims to provide an efficient sludge discharge sedimentation tank, which simplifies a sludge discharge system of the sedimentation tank and a subsequent sludge treatment process, saves the total occupied area and construction cost of a water plant and reduces the water production cost by building the sludge discharge sedimentation tank and a plurality of layers of sedimentation tanks together.

In order to achieve the purpose, the technical scheme of the invention is as follows: 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.

Furthermore, the settling zone and the sludge discharge zone are separated by a partition wall.

Furthermore, the mud scraper is provided with a backflow prevention device on one side close to the central mud discharge pool, so that the mud in the mud discharge area is prevented from flowing back to each layer of sedimentation area.

Further, multilayer sedimentation tank inboard sets up the partition wall, and there is the intercommunication mouth partition wall bottom, and height 0.3 meters to 0.5 meters for the bed mud that the mud scraper scraped falls to the mud discharging district from this intercommunication mouth, and anti-return device is for setting up in partition wall intercommunication mouth department, and keeps apart the brush with the rubber that the mud scraper cooperation set up for thoroughly clear away adnexed mud on the mud scraper.

Furthermore, a sludge collecting pit is arranged at the tail end of the central sludge discharge pond, the depth of the sludge collecting pit is larger than 2m, and the sludge concentration is mainly improved.

Furthermore, the mud scrapers are arranged side by side, and the running speed of the mud scrapers is adjusted according to the mud accumulation condition of the sedimentation tank, so that the running speed of the mud scrapers at the inlet is high, and the running speed of the mud scrapers at the outlet is low.

Furthermore, the mud scrapers of the multi-layer sedimentation tanks connected in parallel on each layer can adopt a uniform driving mode at the same position, and the sedimentation zones on each layer can adopt the same mud scraping speed at the same position, so that the control and management are convenient.

The efficient sludge discharge sedimentation tank disclosed by the invention utilizes the liquid level difference between the sedimentation tank and the sludge discharge tank to realize full gravity sludge discharge, does not need any lifting device, saves energy consumption, and can save sludge treatment structures such as the sludge discharge tank, a recovery tank, a concentration tank, a balance tank and the like. And each layer of sedimentation tank shares a sludge discharge area, so that the sludge discharge efficiency is improved, and the occupied area is saved. Meanwhile, by adopting a supernatant liquid discharge measure, the distance of supernatant liquid backflow is shortened, and the positive hydraulic flow state of a sludge inlet at the bottom of the sludge discharge tank is realized by utilizing the supernatant liquid backflow, so that the sludge in the sludge discharge tank is prevented from entering the sedimentation tank again.

Drawings

Fig. 1 is a plan view of a novel efficient sludge discharge sedimentation tank.

Fig. 2 is a section view A-A of a novel efficient sludge discharge sedimentation tank.

FIG. 3 is a B-B sectional view of a novel efficient sludge discharge sedimentation tank.

FIG. 4 is a C-C section view of a novel efficient sludge discharge sedimentation tank.

Detailed Description

The invention is further described below with reference to the figures and examples.

The embodiment of the invention relates to a novel efficient sludge discharge sedimentation tank which mainly comprises a plurality of layers of sedimentation tanks and a central sludge discharge tank.

The multilayer sedimentation tank is arranged on two sides, and the center is separated by the sludge discharge tank. And a bottom mud scraper is adopted in each settling zone of the multilayer settling pond, the mud scrapers can adopt a reciprocating type, a chain type or other types, but the mud scraping direction is that mud is scraped towards the middle from two sides, and finally the bottom mud is scraped to the central mud discharge pond. Because the function of the central sludge discharge area is to receive bottom sludge of each layer, the sludge discharge process of each layer of sedimentation tank 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 the two sides are a combined tank, the sludge discharge tank is positioned between the two sedimentation tanks, and the sludge discharge tank and the two sedimentation tanks adopt a unified bottom plate structure. The width of the sludge discharge tank is 2-6 m, and the elevation of the bottom of the sludge discharge tank is at least 2-4 m lower than the elevation in the sedimentation tank. And a mud scraper is adopted at the bottom of the mud discharging pool, mud is scraped to a mud collecting pit at the terminal of the mud discharging pool, and finally the mud is discharged into a subsequent sludge treatment facility. The top of the sludge discharge tank adopts a perforated pipe or an effluent weir, and the like, and supernatant is discharged or lifted by a lift pump to flow back to the water inlet pipe of the sedimentation tank.

The mud scraper 1 in the settling zone is laid at the bottom of each layer of settling pond, the length of the mud scraper is the same as the width of the settling pond, the width of the mud scraper can be 10-20 m generally, and the mud scraper is determined according to the total length of the settling pond and the number of the mud scrapers. The mud scraper 1 can adopt various forms such as a chain type or a reciprocating type, and has the main function of scraping the bottom of the sedimentation areas at two sides to deposit mud to the central mud discharge area.

The mud scraper 2 in the mud discharging area is mainly used for concentrating and scraping the mud accumulated at the bottom of the mud discharging area to the mud collecting area of the mud discharging area and finally discharging the mud into a mud dewatering system.

Supernatant discharge system 3 adopts the perforated pipe, also can adopt other water forms such as play mill weir, and the primary function is the discharge mud district supernatant of arranging, or the backward flow supernatant is intake to the sedimentation tank, and supernatant discharge system should guarantee that the mud district surface of water liquid level of arranging is less than sedimentation zone surface of water liquid level simultaneously, makes rivers direction flow to the mud pond always between sedimentation tank and the mud pond of arranging, avoids mud pond mud backward flow to the sedimentation tank, causes the bed mud come-up.

The sludge discharge pipe 4 adopts an electric flow regulating valve to control the sludge discharge speed, and is provided with a sludge concentration meter, and the sludge discharge is stopped when the concentration is lower than 1 percent.

The sludge collecting pit 5 is the tail end of the central sludge discharge pool, the depth of the pit is more than 2m, and the main purpose is to improve the sludge concentration.

The multilayer sedimentation tank is inboard to be set up the partition wall, and there is the intercommunication mouth partition wall bottom, and height 0.3 meters to 0.5 meters for the bed mud that the mud scraper scraped falls to the mud discharging area from this intercommunication mouth.

The anti-backflow device 6 is arranged at the communication port of the partition wall, and is matched with the mud scraper to be arranged on the rubber isolation brush, so that the attached mud on the mud scraper is thoroughly cleared, and the phenomenon that the discharged mud returns to the device in the settling area again to influence the settling effect is prevented. The backflow prevention device 6 also has the function of cleaning the mud scraper 1, and the sludge adsorption condition caused by long-time operation of the mud scraper 1 is avoided.

It is distinguished from the prior art in that:

1. compared with the traditional form of separately building the multilayer sedimentation tank and the sludge discharge tank, the invention adopts the form of jointly building the multilayer sedimentation tank and the sludge discharge tank, shortens the backflow distance of sludge discharge and supernatant, reduces the total number of structures of a water plant, and saves the occupied area.

2. Compared with the traditional sludge discharge mode of the multilayer sedimentation tank, the sludge discharge device adopts the independent sludge discharge area, avoids the influence on other layers of sedimentation tanks in the sludge discharge process of each layer of sedimentation tank, greatly improves the space utilization rate, can share the sludge discharge area of each layer of sedimentation tank, saves land, improves the sludge adsorption and rolling effect and improves the bottom sludge concentration effect of the sludge discharge area.

3. Compared with the traditional longitudinal mud scraping mode of the horizontal sedimentation tank, the two-side sedimentation tank adopts the mode of scraping mud from two sides to the center, so that the mud scraping stroke can be greatly shortened, and the bottom mud retention time is shortened.

4. Compared with a constant-speed mud scraping mode of a horizontal sedimentation tank, the invention can arrange a plurality of mud scrapers in the length direction of the sedimentation tank, the running speed of the mud scrapers close to the inlet of the sedimentation tank is high, and the running speed of the mud scrapers close to the outlet of the sedimentation tank is low. The variable speed mud scraping mode is suitable for the characteristics of more sludge at the inlet and less sludge at the outlet of the sedimentation tank. On the one hand, a large amount of sludge at the inlet can be scraped away in time through the quick operation of the inlet mud scraper, and on the other hand, the low-speed operation of the outlet mud scraper avoids the over-high mud scraping speed to disturb the light and small bottom flocs to float upwards again. Because the invention adopts the parallel connection mode of the sedimentation tanks of each layer, under the condition of ensuring the uniform water inlet end, the mud amount at the bottom of the sedimentation tanks of the upper and lower layers is very close, the sedimentation tanks of the upper and lower layers can share the mud scraper, namely, the sedimentation tanks of each layer at the same position adopt the same mud scraping speed, thereby reducing the control difficulty.

5. Compared with the traditional horizontal flow sedimentation tank sludge discharge mode, the horizontal flow sedimentation tank sludge discharge device disclosed by the invention fully utilizes the liquid level difference of the sedimentation tank, the sludge discharge water in the sludge discharge tank is not required to be lifted by a water pump, the gravity sludge discharge can be realized by directly depending on the higher liquid level of the sludge discharge tank, and the energy consumption is saved.

6. Compared with the traditional horizontal sedimentation tank, the invention has the advantages that the height difference of the liquid levels of the sedimentation zone and the sludge discharge zone is very small, and the energy consumption of supernatant liquid reflux is very low, so that the high-flow reflux of the supernatant liquid can be realized. The method is favorable for improving the floc removal efficiency, on one hand, the large flocs are discharged into a sludge discharge area as early as possible for concentration, and on the other hand, the small flocs are refluxed through supernatant liquid to form the large flocs.

7. Compared with the traditional horizontal sedimentation tank, the invention realizes the rapid separation of the bottom mud and the sedimentation raw water, and simultaneously the supernatant liquid flows back. The measures of discharging the sludge water and the like also ensure that the communication port from the sedimentation tank to the sludge discharge tank is always in a water flow positive inflow state, and the unfavorable phenomena that the bottom sludge of the sludge discharge tank flows back to the sedimentation tank to cause the bottom sludge to float upwards and the like are eliminated. The characteristic also avoids the condition that the sludge discharged from the upper sedimentation tank can flow back to the lower sedimentation tank.

Claims

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.