Enhanced sludge dewatering system

Abstract

The utility model discloses an enhanced sludge dewatering system, which comprises a sludge storage tank provided with a sludge outlet, and is characterized in that the sludge outlet is connected with a feed pipe of a sludge pump, an outlet of the sludge pump is connected with an inlet of a primary cavitation device, an outlet of the primary cavitation device is connected with an inlet of a secondary cavitation device, and the secondary cavitation device is connected with an outlet of the sludge pump. The first-stage cavitation device and the second-stage cavitation device are both Venturi tubes, and the pipe diameter of a throat pipe of the first-stage cavitation device is larger than that of a throat pipe of the second-stage cavitation device. Design is reasonable and structure is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to an enhanced sludge dewatering system. Background Art

[0002] At present, belt filter presses are mostly used for large-scale sludge dewatering, which can reduce the water content of sludge to 80-85%. The dewatering effect is not very good, resulting in a large amount of final sludge and high transportation and treatment costs.

[0003] The water in sludge is free water, interstitial water and intracellular water.

[0004] Among them, free water can be pressed out relatively easily. Interstitial water is the water wrapped between sludge particles, and part of it can be removed through the filter press, but intracellular water is very difficult to be removed through the filter press. For large sewage treatment plants that have already invested in belt filter presses, replacing the filter press will undoubtedly result in a large cost investment. Therefore, it is hoped to improve the dewatering effect and reduce costs without replacing the filter press.

[0005] At present, as disclosed in CN 209039311 U, an automatic dosing reaction control device for sludge dewatering is provided, including a Venturi pipe mixer, a three-way interface, a multi-stage stirring paddle, a flocculant dosing pipe, a flocculant supply pipe, a sludge inlet pipe, a flocculant dosing pump and a control unit. The sludge inlet pipe is connected to the upper port of the three-way interface, the right port of the three-way interface is connected to the inlet section of the Venturi pipe mixer, the multi-stage stirring paddle is horizontally placed inside the Venturi pipe mixer, one end of the flocculant dosing pipe is connected to the throat of the Venturi pipe mixer, the flocculant dosing pump is installed on the flocculant supply pipe, and the control unit is connected to the flocculant dosing pump. The control unit of the utility model real-time monitors the readings of the pH meter, sludge flow meter, sludge concentration meter and flocculant concentration, and calculates the theoretical dosing amount of the flocculant, so that the actual dosing amount of the flocculant is equal to the theoretical dosing amount, thereby realizing the accurate and timely dosing control of the flocculant. Small treatment plants use spiral sludge dewatering machines, and the dewatering effect is better. This method also involves the addition of chemicals. Content of the Utility Model

[0006] In order to solve the above technical problems, the utility model provides another enhanced sludge dewatering system, which is reasonably designed and has a simple structure. On the existing basis, it can reduce the water content of sludge.

[0007] To achieve the above object, the utility model is realized by the following technical solutions: A strengthened sludge dewatering system includes a sludge storage tank, and a sludge outlet is arranged on the sludge storage tank. It is characterized in that: the sludge outlet is connected to the feed pipe of a sludge pump, the outlet of the sludge pump is connected to the inlet of a primary cavitation device, the outlet of the primary cavitation device is connected to the inlet of a secondary cavitation device, both the primary cavitation device and the secondary cavitation device are Venturi tubes, and the diameter of the throat of the primary cavitation device is larger than that of the throat of the secondary cavitation device. The outlet of the secondary cavitation device is connected to a belt filter press.

[0008] In the above solution: an air inlet pipe is arranged on the feed pipe of the sludge pump, and an air inlet valve is arranged on the air inlet pipe. By arranging the air inlet pipe and sucking air through the negative pressure of the pump, the three-phase turbulent agitation of solid, liquid and gas is realized, so that the cell wall breaking effect is better and it is more beneficial to remove the intracellular water.

[0009] In the above solution: the air inlet pipe is an L-shaped elbow pipe, which extends from the sludge outlet of the sludge storage tank along the tank wall of the sludge storage tank into the feed pipe of the sludge pump. The upper end of the air inlet pipe extends outside the sludge storage tank, and the outer diameter of the air inlet pipe is smaller than the inner diameter of the feed pipe. It is directly fixed in the sludge storage tank, and the air inlet pipe is inserted, and the negative pressure of the pump can be used to suck air, which is convenient for installation.

[0010] In the above solution: the air inlet pipe is fixed on the tank wall of the sludge storage tank through a fixing device.

[0011] In the above solution: there are at least two secondary cavitation devices, and all the secondary cavitation devices are connected in parallel. Two are connected in parallel and processed simultaneously. The processing efficiency is improved.

[0012] In the above solution, the diameter of the throat of the primary cavitation device is 4-5 mm, and the diameter of the throat of the secondary cavitation device is 2-3 mm.

[0013] In the above solution, a filter screen with a pore diameter of 2-3 mm is arranged at the inlet of the feed pipe of the sludge pump. It is used to intercept sundries such as hair.

[0014] Beneficial effects: The utility model uses two-stage cavitation devices. Through the pressurization, strengthening, turbulent flow, jet flow and other effects of the Venturi tube, the two-stage Venturi tubes realize double pulses, which ultimately cause cell rupture, release intracellular water, and make the wrapped polymer loose, which is beneficial to the removal of the wrapped water. The sludge coming out of the secondary cavitation device then enters the belt filter press for dewatering. On the existing basis, the moisture content of the sludge can be reduced by 7-10% (for example, the original belt filter press can reduce the moisture content of the sludge to 80%, and after adding our equipment, the moisture content can reach 70%-73%). By adding air, the moisture content can be further reduced by 2-5% (explained as above). The structure is simple, the design is reasonable, and the modification cost is low. Description of the Drawings

[0015] Figure 1 This is a schematic structural diagram of the present utility model. Specific embodiments

[0016] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] Embodiment 1

[0018] As Figure 1 shown, the enhanced sludge dewatering system includes a sludge storage tank 1. A sludge outlet is provided on the sludge storage tank 1, and the sludge outlet is connected to the feed pipe of a sludge pump 2. Preferably, a filter screen with a pore diameter of 2 - 3 mm is provided at the inlet of the feed pipe of the sludge pump 2 for intercepting hair and the like. The outlet of the sludge pump 2 is connected to the inlet of a primary cavitation device 3, the outlet of the primary cavitation device 3 is connected to the inlet of a secondary cavitation device 4, and the outlet of the secondary cavitation device is connected to a traditional belt filter press. Both the primary cavitation device 3 and the secondary cavitation device 4 are Venturi tubes. The Venturi tube is a prior art, and the inlet is at the flared end. The diameter of the throat of the primary cavitation device 3 is larger than the diameter of the throat of the secondary cavitation device 4. Specifically, the diameter of the throat of the primary cavitation device 3 is 4 - 5 mm, and the diameter of the throat of the secondary cavitation device 4 is 2 - 3 mm. Specifically, in order to improve the treatment efficiency, there are at least two secondary cavitation devices 4, and all the secondary cavitation devices 4 are connected in parallel. Only two are drawn in the figure. In order to further reduce the moisture content, an air inlet pipe 5 is provided on the feed pipe of the sludge pump 2, and an air inlet valve 6 is provided on the air inlet pipe 5. Preferably, the air inlet pipe 5 is an L-shaped elbow, which extends from the sludge outlet of the sludge storage tank 1 along the tank wall of the sludge storage tank 1 into the feed pipe of the sludge pump. The upper end of the air inlet pipe 5 extends outside the sludge storage tank 1, and the outer diameter of the air inlet pipe 5 is smaller than the inner diameter of the feed pipe. The air inlet pipe 5 is fixed to the tank wall of the sludge storage tank 1 through a fixing device.

[0019] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An enhanced sludge dewatering system, comprising a sludge storage tank, wherein the sludge storage tank is provided with a sludge outlet, characterized in that: The sludge outlet is connected to the feed pipe of the sludge pump, the outlet of the sludge pump is connected to the inlet of the primary cavitation device, the outlet of the primary cavitation device is connected to the inlet of the secondary cavitation device, the primary cavitation device and the secondary cavitation device are both Venturi tubes, and the diameter of the throat of the primary cavitation device is larger than the diameter of the throat of the secondary cavitation device.

2. The enhanced sludge dewatering system according to claim 1, characterized in that: An air intake pipe is arranged on the feed pipe of the sludge pump, and an air intake valve is arranged on the air intake pipe.

3. The enhanced sludge dewatering system according to claim 2, characterized in that: The air inlet pipe is an L-shaped curved pipe, extending along the wall of the sludge storage tank from the sludge outlet of the sludge storage tank to the feed pipe of the sludge pump, the upper end of the air inlet pipe extends outside the sludge storage tank, and the outer diameter of the air inlet pipe is smaller than the inner diameter of the feed pipe.

4. The enhanced sludge dewatering system according to claim 3, characterized in that: The air intake pipe is fixed to the tank wall of the mud storage tank through a fixing device.

5. The enhanced sludge dewatering system according to claim 1, characterized in that: There are at least two secondary cavitation devices, and all the secondary cavitation devices are connected in parallel.

6. The enhanced sludge dewatering system according to any one of claims 1 to 5, characterized in that: The diameter of the throat of the primary cavitation device is 4-5 mm, and the diameter of the throat of the secondary cavitation device is 2-3 mm.

7. The enhanced sludge dewatering system according to claim 6, characterized in that: The inlet of the feed pipe of the sludge pump is provided with a filter screen with a pore size of 2-3 mm.

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