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Step-by-step filter pressing method for sludge dewatering

A sludge dehydration and sludge technology, which is applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problems of long equipment maintenance time, low diaphragm pump pressure, low sludge dehydration rate, etc. problems, to achieve the effect of improving equipment utilization, reducing wear and tear, and increasing dehydration rate

Inactive Publication Date: 2020-06-12
上海安美特铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the deficiencies of the prior art, the present invention provides a step-by-step filter press method for sludge dewatering, on the one hand, it solves the problems that the screw pump transports the flow-through parts for a long time and is easy to wear, the maintenance time of the equipment is long, and the maintenance cost is high. On the other hand, it also solves the problem of relatively low pressure of the diaphragm pump and relatively low sludge dewatering rate, and achieves the effect of significantly improving the equipment utilization rate and sludge dewatering rate

Method used

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  • Step-by-step filter pressing method for sludge dewatering

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Embodiment 1

[0031] A step-by-step filter press method for sludge dewatering, using equipment such as figure 1 As shown, it includes a plate and frame filter press 1, a screw pump 2, and a diaphragm pump 3. After the screw pump 2 and the diaphragm pump 3 are connected in parallel, they are connected to the inlet of the plate and frame filter press 1. On the plate and frame filter press 1, An electric contact pressure gauge 4 for detecting pressure is also connected. Described step-by-step pressure method specifically comprises the following steps:

[0032] A. Use a diaphragm pump (flow rate of 12m) to concentrate the sludge (water content 70%) 3 / h) transported to the plate and frame filter press for press filtration, when the pressure in the plate and frame filter press is higher than the set high pressure of 0.55MPa, the diaphragm pump stops working;

[0033] B. When the pressure in the plate and frame filter press drops to the set low pressure of 0.3MPa, the sludge is sent to the plat...

Embodiment 2

[0039] A step-by-step filter press method for sludge dewatering, using equipment such as figure 1 As shown, it includes a plate and frame filter press 1, a screw pump 2, and a diaphragm pump 3. After the screw pump 2 and the diaphragm pump 3 are connected in parallel, they are connected to the inlet of the plate and frame filter press 1. On the plate and frame filter press 1, An electric contact pressure gauge 4 for detecting pressure is also connected. Described step-by-step pressure method specifically comprises the following steps:

[0040] A. Use a diaphragm pump (flow rate of 12m) to concentrate the sludge (water content 80%) 3 / h) transported to the plate and frame filter press for press filtration, when the pressure in the plate and frame filter press is higher than the set high pressure 0.6MPa, the diaphragm pump stops working;

[0041] B. When the pressure in the plate and frame filter press drops to the set low pressure of 0.3MPa, the sludge is sent to the plate an...

Embodiment 3

[0047] A step-by-step filter press method for sludge dewatering, using equipment such as figure 1 As shown, it includes a plate and frame filter press 1, a screw pump 2, and a diaphragm pump 3. After the screw pump 2 and the diaphragm pump 3 are connected in parallel, they are connected to the inlet of the plate and frame filter press 1. On the plate and frame filter press 1, An electric contact pressure gauge 4 for detecting pressure is also connected. Described step-by-step pressure method specifically comprises the following steps:

[0048] A. Use a diaphragm pump (flow rate of 12m) to concentrate the sludge (water content 60%) 3 / h) transported to the plate and frame filter press for press filtration, when the pressure in the plate and frame filter press is higher than the set high pressure 0.6MPa, the diaphragm pump stops working;

[0049] B. When the pressure in the plate and frame filter press drops to the set low pressure of 0.3MPa, the sludge is sent to the plate an...

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Abstract

The invention discloses a step-by-step filter pressing method for sludge dewatering. The step-by-step filter pressing method comprises the following steps: A, conveying sludge into a plate-and-frame filter press by using a diaphragm pump for filter pressing, and stopping the diaphragm pump when the pressure in the plate-and-frame filter press is higher than a set high pressure; B, when the pressure in the plate-and-frame filter press is reduced to a set low pressure, pumping the sludge into the plate-and-frame filter press by using a screw rod; C, when the pressure in the plate-and-frame filter press is higher than the set high pressure, the screw pump stops working; D, when the pressure in the plate-and-frame filter press is reduced to a set low pressure, conveying the sludge into the plate-and-frame filter press by using a screw pump; and E, repeating the steps C and D until the pressure is not reduced any more, thereby obtaining the dewatered sludge. First-stage conveying is carriedout by utilizing the characteristic of high flow of the diaphragm pump so that the conveying time of the first stage is shortened, and the efficiency is improved; in the second stage, the screw pumpis used for conveying, and the pressure is higher and thus water in the sludge mixed solution is easier to extrude out and the dehydration rate is improved.

Description

technical field [0001] The invention relates to the technical field of sludge dewatering, in particular to a step-by-step filter press method for sludge dewatering. Background technique [0002] With the rapid development of the global social economy and the gradual improvement of people's living standards, environmental problems have gradually increased. Among them, the problem of sewage and sludge is becoming more and more serious, the amount of sewage discharge and treatment is gradually increasing, and the corresponding amount of sludge generation is also increasing. Therefore, how to effectively treat urban sludge and realize the harmless, resourceful and high-value sludge has become an urgent problem that must be solved in our country. In order to effectively treat sludge, the state has set strict requirements on the moisture content of various sludge disposal methods. For example, landfill requires that the moisture content of sludge should be less than 60%, and the ...

Claims

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Application Information

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IPC IPC(8): C02F11/122
CPCC02F11/122
Inventor 李凡李立群
Owner 上海安美特铝业有限公司