Sludge biological dehydration system

Abstract

The utility model discloses a sludge biological dehydration system, which is characterized by comprising an anaerobic jar, an outlet of the anaerobic jar is connected with a sludge storage tank, an outlet of the sludge storage tank is connected with a feed pipe of a sludge pump, an outlet of the sludge pump is connected with an inlet of a cavitation device, the cavitation device is a Venturi tube, and the inlet of the cavitation device is connected with the feed pipe of the sludge pump. The inlet of the cavitation device is located at the flaring end of the Venturi tube, the outlet of the cavitation device is connected with the circulating tank, the circulating tank is connected with the sludge storage tank through the circulating pump, and the circulating tank is further connected to a subsequent filter press. After anaerobic strengthening, through pressurization at the front end of the venturi tube, pressure release at the rear end of the venturi tube and the turbulent flow effect of the venturi tube, cells are finally broken, intracellular water is released, a wrapping polymer is loosened, removal of wrapping water is facilitated, the structure is simple, the design is reasonable, and the modification cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a sludge biological dehydration system. Background Art

[0002] At present, most large-scale sludge dewatering adopts belt filter presses, which can dewater the sludge to a moisture content of 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 the 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 and sludge, and part of it can be removed by the filter press, but intracellular water is very difficult to be removed by the filter press. For large sewage treatment plants, belt filter presses have been put into use. If the filter press is replaced, it 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, for example, CN 209039311 U discloses a reagent automatic dosing reaction control device for sludge dewatering, 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 a pH meter, a sludge flow meter, a sludge concentration meter and a 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 adopt spiral sludge dewatering machines, and the dewatering effect is better. This method also involves the addition of reagents. Content of the Utility Model

[0006] In order to solve the above technical problems, the utility model provides another sludge biological dehydration system, which is reasonably designed and has a simple structure. On the existing basis, it can reduce the moisture content of the sludge by 7% - 10% without adding reagents such as flocculants.

[0007] To achieve the above object, the utility model is realized by the following technical solutions: A sludge biological dehydration system, characterized in that: it includes an anaerobic tank, the outlet of the anaerobic tank is connected to a sludge storage tank, the outlet of the sludge storage tank is connected to the feed pipe of a sludge pump, the outlet of the sludge pump is connected to the inlet of a cavitation device, the cavitation device is a Venturi tube, and the inlet is located at the flared end of the Venturi tube. The outlet of the cavitation device is connected to a circulation tank, the circulation tank is connected to the sludge storage tank through a circulation pump, and the circulation tank is also connected to a subsequent filter press.

[0008] In the above solution: The inlet of the feed pipe of the sludge pump is provided with a filter screen with a pore diameter of 2-3 mm.

[0009] In the above solution: A methane collection pipe is provided at the upper part of the anaerobic tank, and a branch pipe of the methane collection pipe is connected to the bottom air inlet of the anaerobic tank. Through the reflux of methane, on the one hand, it promotes the release of gas in the anaerobic tank and strengthens dehydration. On the other hand, it increases the anaerobic effect during the gas production process and improves the anaerobic efficiency. It is beneficial to the loosening of the encapsulated polymer and the rupture and death of cells, thereby releasing intracellular water and interstitial water.

[0010] In the above solution: The diameter of the throat of the cavitation device is 4-5 mm. Valves are provided on the methane collection pipe and its branch pipe.

[0011] Beneficial effects: After anaerobic strengthening of the utility model, through the front-end pressurization and rear-end pressure release of the Venturi tube, as well as the turbulent flow effect of the Venturi tube, it finally causes cell rupture, releases intracellular water, and makes the encapsulated polymer loose, which is beneficial to the removal of encapsulated water. It can reduce the sludge moisture content by 7%-10% (for example, the original belt filter press can reduce the sludge moisture content to 80%, and after adding our equipment, the moisture content can reach 70%-73%). There is no need to add flocculants and other chemicals. The structure is simple, the design is reasonable, and the modification cost is low. Description of the Drawings

[0012] Figure 1 It is a structural schematic diagram of the utility model. Detailed Embodiments

[0013] The following further describes the utility model with reference to the drawings and embodiments.

[0014] Embodiment 1

[0015] As Figure 1 shown, the sludge biological dehydration system includes a sealed anaerobic tank 1, a sludge pipe is provided on the anaerobic tank, the outlet of the anaerobic tank 1 is connected to a sludge storage tank 2 through a pump, a methane collection pipe 7 is provided at the upper part of the anaerobic tank 1, and a branch pipe of the methane collection pipe 7 is connected to the bottom air inlet of the anaerobic tank 1. Valves are provided on the methane collection pipe 7 and its branch pipe.

[0016] The outlet of the sludge storage tank 2 is connected to the feed pipe of the sludge pump 3. A filter screen with a pore diameter of 2 - 3 mm (not shown in the figure) is provided at the inlet of the feed pipe of the sludge pump 3, which can be used to intercept sundries such as hair. The outlet of the sludge pump 3 is connected to the inlet of the cavitation device 4. The cavitation device is a Venturi tube, and the structure of the Venturi tube is prior art. The inlet is located at the flared end of the Venturi tube, and the diameter of the throat of the cavitation device is 4 - 5 mm. The outlet of the cavitation device is connected to the circulation tank 5. The circulation tank 5 is connected to the sludge storage tank 2 through the circulation pump 6, and the circulation tank 5 is also connected to the subsequent belt filter press. When the dehydration effect is not ideal, the sludge can be returned from the circulation tank to the sludge storage tank 2 again, and through the pressurization and decompression and turbulent flow effects of the Venturi tube again, the moisture content can be reduced.

[0017] Although the embodiments of the present invention 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 principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sludge biological dehydration system, characterized in that: The invention comprises an anaerobic tank, the outlet of which is connected to a sludge storage tank, the outlet of which is connected to a feed pipe of a sludge pump, the outlet of which is connected to an inlet of a cavitation device, the cavitation device is a venturi tube, the inlet of which is located at the flared end of the venturi tube, the outlet of the cavitation device is connected to a circulation tank, the circulation tank is connected to the sludge storage tank through a circulation pump, and the circulation tank is also connected to a subsequent filter press; a filter screen with a pore size of 2-3 mm is arranged at the inlet of the feed pipe of the sludge pump; a methane collecting pipe is arranged at the top of the anaerobic tank, a branch pipe of which is connected to the bottom air inlet of the anaerobic tank; the diameter of the throat of the cavitation device is 4-5 mm.

2. The sludge biological dehydration system according to claim 1, characterized in that: The methane collecting pipe and its branch pipes are provided with valves.

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