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Acid solution, device and process for cleaning sludge plate and frame dewatering filter cloth

A plate and frame filter press and plate and frame technology, applied in the field of plate and frame filter press, can solve the problems of non-adjustable cleaning liquid concentration, limited scope of application, and secondary pollution of the environment, so as to promote sludge conditioning and dehydration and realize environmental protection Utilization, equipment corrosion effect is small

Active Publication Date: 2018-08-03
WUXI HUAGUANG BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrochloric acid solution with a mass concentration of 3~3.5% is circulated in the system composed of the cleaning pipeline and the filter press through the acid-resistant pump. However, the concentration of the cleaning solution cannot be adjusted, and the scope of application is limited. Using hydrochloric acid as the cleaning solution is easy to cause chloride ions Residues, causing secondary pollution to the environment

Method used

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  • Acid solution, device and process for cleaning sludge plate and frame dewatering filter cloth

Examples

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Effect test

specific Embodiment 1

[0048] Specific embodiment 1: A certain sludge deep dewatering project has two diaphragm plate and frame filter presses, the filter plate size of the plate and frame filter press is 2m*2m, and there are 115 filter plates. After using for a period of time, the filter cloth has obvious scale, the filter cloth hardens, the feed pressure rises rapidly to above 1.0MPa and the injection volume decreases obviously, indicating that the filter cloth of the table frame needs to be cleaned. The mass percentages of scale components are as follows: 32.5% calcium carbonate, 17.9% calcium hydroxide, 6.5% magnesium hydroxide, 21.6% iron hydroxide, 14.2% magnesium hydrogen phosphate, and 7.3% with unknown ingredients. The PLC controller starts the acid mixing process, and the acid liquid tank is injected with 0.3 t of acetic acid (acetic acid content ≥ 99.5%), 0.2 t of oxalic acid (oxalic acid content ≥ 99%), and 0.1 t of citric acid (citric acid content ≥ 99%) through the delivery device. Aft...

specific Embodiment 2

[0049] Specific embodiment 2: A certain sludge deep dewatering project has two diaphragm plate and frame filter presses, the filter plate size of the plate and frame filter press is 1.5m*1.5m, and there are 110 filter plates. After using for a period of time, the filter cloth has obvious scale, the filter cloth hardens, the feed pressure rises rapidly to above 1.0MPa and the injection volume decreases obviously, indicating that the filter cloth of the table frame needs to be cleaned. The mass percentages of scale components were determined to be 30.8% calcium carbonate, 16.6% calcium hydroxide, 6.4% magnesium hydroxide, 23.8% iron hydroxide, 12.5% ​​magnesium hydrogen phosphate, and 9.9% with unknown ingredients. The PLC controller starts the acid mixing process, and the acid liquid tank is injected with 0.4 t of acetic acid (acetic acid content ≥ 99.5%), 0.28 t of oxalic acid (oxalic acid content ≥ 99%), and 0.12 t of citric acid (citric acid content ≥ 99%) through the deliver...

specific Embodiment 3

[0050] Specific embodiment 3: A certain sludge deep dewatering project has two diaphragm plate and frame filter presses, the filter plate size of the plate and frame filter press is 1.5m*1.5m, and there are 110 filter plates. After using for a period of time, the filter cloth has obvious scale, the filter cloth hardens, the feed pressure rises rapidly to above 1.0MPa and the injection volume decreases obviously, indicating that the filter cloth of the table frame needs to be cleaned. After testing, the ingredients of the scale were calcium carbonate 31.6%, calcium hydroxide 17.1%, magnesium hydroxide 6.8%, iron hydroxide 22.8%, magnesium hydrogen phosphate 13.5%, and 8.2% unknown. The PLC controller starts the acid mixing process, and the acid liquid tank is injected with 0.32 t of acetic acid (acetic acid content ≥ 99.5%), 0.24 t of oxalic acid (oxalic acid content ≥ 99%), and 0.08 t of citric acid (citric acid content ≥ 99%) through the delivery device. After diluting with w...

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Abstract

The invention provides acid solution, device and process for cleaning sludge plate-frame dewatering filter cloth.The acid solution for cleaning sludge plate-frame dewatering filter cloth is environmental friendly and can effectively remove scales on the filter cloth with low damage to the same.The device for cleaning sludge plate-frame dewatering filter cloth comprises an acid solution tank, a dilute acid return tank, at least two plate-frame pressure filters, an acid injection pump, a dilute acid reflux pump, a supernatant acid reflux pump and an acid storage compartment; in the acid storage compartment, the acid solution is prepared by dissolving acetic acid, oxalic acid and citric acid according to the mass ratio of 3:2:1-4:3:1 in water, and acid concentration of the acid solution is less than or equal to 10%; a sludge scraper is arranged at the bottom of the dilute acid reflux tank, an alkali feed inlet is arranged on the dilute acid reflux tank which is further connected with a sludge quenching and tempering tank.The device for cleaning sludge plate-frame dewatering filter cloth has the advantages of short time for cleaning, good cleaning effect, capability of producing and running continuously, no discharge of waste liquid and no secondary pollution.

Description

technical field [0001] The invention relates to the technical field of plate and frame filter press, in particular to an acid solution, a device and a process for cleaning sludge plate and frame dewatering filter cloth. Background technique [0002] Plate and frame filter press is a common method for deep sludge dewatering. During the filtration process, the solid particles in the fluid collide with the filter cloth hole wall, and the particles are captured and retained by the filter cloth, so that they are separated from the fluid and achieve solid-liquid separation. For the purpose of deep dehydration of sludge, it is necessary to add a large amount of calcium, magnesium, iron, and aluminum conditioning agents. Some of the tiny flocs formed by these agents and sludge are easily accumulated on the filter cloth yarn under strong pressure. In the pores between the threads and the gaps between the fibers, at the same time, because the added coagulant agents mostly exist in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11D7/26C11D7/60B01D25/32
CPCB01D25/325B01D2201/085C11D7/265C11D11/0017
Inventor 何艳华蒋志坚王红军薛一帆张蕾徐宇灏章旭
Owner WUXI HUAGUANG BOILER
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