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High-effective composite filter aid for sludge dehydration and method of use thereof

A sludge dehydration and filter aid technology, applied in the direction of dehydration/drying/thickened sludge treatment, etc., can solve the problems of reducing to about 70%, secondary pollution, complex process, etc., to achieve improved dehydration performance, no secondary Pollution, the effect of simple process

Inactive Publication Date: 2008-05-21
天津渤海环保工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, after the flocculant is added, the moisture content of the mechanically dewatered sludge is generally about 70% to 80%, but it is difficult to reduce the moisture content of the sludge to a lower level.
[0007] Shen Yinghua, Wang Bin, Wang Zhizhong and others published the article "Application of Organic Polymer Flocculants in Sludge Dewatering" in "Macromolecular Materials Science and Engineering" 2004.20(9): 55-58, introducing organic polymers The type, molecular weight, anion and cation degree, dosage, and pH value of the flocculant have a significant impact on the sludge dewatering performance, and the cost of the flocculant is very high
[0008] At present, the most commonly used organic polymer flocculant in my country is polyacrylamide (PAM) cationic flocculant, and its disadvantages are: (1) high synthesis cost and complicated process
(2) The moisture content of the sludge treated with PAM can only be reduced to about 70% after mechanical dehydration
(3) During the dehydration process, it can be partially hydrolyzed into toxic monomers such as acrylic acid and organic amines, resulting in secondary pollution in the water treatment process

Method used

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  • High-effective composite filter aid for sludge dehydration and method of use thereof

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Experimental program
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Effect test

Embodiment 1

[0029] The sludge without adding high-efficiency composite filter aid was dehydrated by a belt filter press with a moisture content of 77.8% and a specific resistance of 2.0×10 13 m / kg.

[0030] Add 2% high-efficiency composite filter aid (Al 2 o 3 30%, SiO 2 55%, CaO 2%, bentonite 3%, iron powder 10%), stir evenly to destabilize the sludge. Adjust the sludge supply of the sludge pump, the filter belt speed is 2m / min, and the dehydration tension is 0.3MPa. The washing quality of the filter belt has a great influence on the dehydration effect, and the pressure of the washing water selected in the present invention is 0.7MPa. After dehydration, the moisture content of the sludge is 48%, and the specific resistance is 0.6×10 11 m / kg.

Embodiment 2

[0032] The moisture content of the sludge without adding high-efficiency composite filter aid is 76.5% after dehydration with a centrifugal dehydrator, and the specific resistance is 1.7×10 13 m / kg.

[0033] Add 5% high-efficiency composite filter aid (Al 2 o 3 20%, SiO 2 55%, CaO 8%, bentonite 13%, iron powder 4%), using a centrifugal dehydrator, the centrifuge speed is 2800rpm, and the speed difference is 13rpm. After being dehydrated by a centrifugal dehydrator, the moisture content is 49.5%, and the specific resistance is 0.71×10 11 m / kg.

Embodiment 3

[0035] The moisture content of the sludge without adding high-efficiency composite filter aid is 79.3% after dehydration with a plate and frame filter press, and the specific resistance is 2.1×10 13 m / kg.

[0036] Add 6% high-efficiency composite filter aid (Al 2 o 3 30%, SiO 2 40%, CaO 8%, bentonite 12%, iron powder 10%), using a plate and frame filter press for dehydration, the pressure is 1.2MPa. μXL (distributed control) system. The sludge discharge tank, lifting pump room, thickening tank, dehydration machine room equipment and instrument status are all manually operated and monitored by the CRT (industrial control system) operating station. After dehydration, the moisture content of the sludge is 49.6%, and the specific resistance is 0.89×10 11 m / kg.

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Abstract

The invention discloses a high-efficiency composite filter aid for sludge dewatering. The raw material components and weight percentages are: 20%-30% of Al2O3, 40%-55% of SiO2, 2%-8% of CaO, and 3%-3% of bentonite. 13%, iron powder 4% ~ 10%; on this basis, Fe2O3 3% ~ 10%, MgO 0.6% ~ 2%, K2O 1% ~ 2.5%, Na2O 0.1% ~ 0.7%. Adding the high-efficiency composite filter aid with a mass percentage of 2% to 6% to the precipitated sludge can reduce the water content to 40% to 50%, without using special drying equipment. The invention has high dehydration efficiency, low cost, simple process and no secondary pollution, and is suitable for centralized treatment of sludge in various sewage treatment plants.

Description

technical field [0001] The invention relates to a dewatering agent, in particular to a high-efficiency composite filter aid for sludge dewatering. Background technique [0002] In 2004, the total discharge of wastewater in the country was 48.24 billion tons, including 22.11 billion tons of industrial wastewater, 26.13 billion tons of urban domestic sewage, and 13.392 million tons of COD in wastewater. If 65% of the sewage is treated with biological methods, based on the calculation of 2.7 tons (dry mass) of sludge produced by 10,000 tons of wastewater, the country will produce 8.47 million tons (dry mass) of sludge. If it is equivalent to 80% water content, the sludge will be 4233 It can be seen that the treatment of sludge has become another problem faced by sewage treatment plants. The cost of sludge treatment and disposal mainly includes on-site transportation costs, off-site transportation costs and landfill costs, and the most important factor affecting the cost is the...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 高亮张景辉高建东张曙光狄海燕张国立赵昕哲闫志海王义
Owner 天津渤海环保工程有限公司
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