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Method for processing sludge employing biocide-coupled quick lime

A biocide and quicklime technology, which can be used in sludge treatment, special treatment targets, chemical instruments and methods, etc., can solve the problems of large sludge volume, difficult sludge dewatering, and inability to meet the requirements of sludge treatment. Sludge dewatering rate, preventing sludge from clogging filter cloth, preventing secondary pollution of sludge

Active Publication Date: 2015-03-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong hydrophilicity of the bacteria colloidal polymer of the sludge, it is difficult to dewater the sludge. After conventional dehydration, the sludge is bulky, which brings great difficulties to the transportation of the sludge from the factory.
[0004] At present, the mechanical dehydration method used by domestic sewage treatment plants can only reduce the moisture content of sludge to about 80wt.%, which cannot meet the requirements of subsequent sludge treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Add the biocide isothiazolinone to the dewatered sludge (water content 80wt.%) of the urban sewage plant, and the addition amount is 0.4wt.% of the dry weight of the sludge;

[0023] ② Add quicklime powder to the above sludge and stir evenly. The amount of quicklime added is 8% of the dry weight of the sludge base. React the sludge with the biocide and quicklime for 1 hour to obtain press-filtered sludge;

[0024] ③ Wrap the press filter sludge with double-layer filter cloth, the inner layer is 90-mesh nylon filter cloth, and the outer layer is polyester filter cloth;

[0025] ④Put a filter bag wrapped in sludge into the filter press cylinder, use the filter press assembled with AEEF-AC three-phase motor and ZK HP MODEL MOB50×300 hydraulic cylinder to press filter, the pressure is 0.4Mpa, and the filter press time is 1.5h.

[0026] ⑤ After drying at 105°C to constant weight, the moisture content of the sludge was measured to be 56.3wt.%, and the calorific value was ...

Embodiment 2

[0028] 1. Add the biocide isothiazolinone to the river bottom mud (water content 60wt.%), and the addition amount is 0.4wt.% of the dry weight of the sludge base;

[0029] ② Add quicklime powder to the above sludge and stir evenly. The amount of quicklime added is 8% of the dry weight of the sludge base. React the sludge with the biocide and quicklime for 1 hour to obtain press-filtered sludge;

[0030] ③The filter press treatment sludge is wrapped with double-layer filter cloth, the inner layer is 80-mesh nylon filter cloth, and the outer layer is polyester filter cloth; it is used as a filter bag;

[0031] ④Put a filter bag wrapped in sludge into the filter press cylinder, use the filter press assembled with AEEF-AC three-phase motor and ZK HP MODEL MOB50×300 hydraulic cylinder to press filter, the pressure is 0.4Mpa, and the filter press time is 1.5h.

[0032] ⑤After drying at 105°C to constant weight, the moisture content of the sludge was measured to be 40.1wt.%, and the...

Embodiment 3

[0034] ①Add the biocide isothiazolinone to the dewatered sludge (water content 75wt.%) of the urban sewage plant, and the addition amount is 0.6% of the dry weight of the sludge base;

[0035] ② Add quicklime powder to the above sludge and stir evenly. The amount of quicklime added is 12% of the dry weight of the sludge base. React the sludge with the biocide and quicklime for 2 hours to obtain press-filtered sludge;

[0036] ③ Wrap the press filter sludge with double-layer filter cloth, the inner layer is 100-mesh nylon filter cloth, and the outer layer is polyester filter cloth;

[0037] ④Put 3 filter bags wrapped in sludge into the filter press cylinder, and press filter with the filter press assembled with AEEF-AC three-phase motor and ZK HP MODEL MOB50×300 hydraulic cylinder. The pressure per unit area of ​​the mud cake is 0.4Mpa, The filter press time is 1h.

[0038] ⑤After drying at 105°C to constant weight, the moisture content of the sludge was measured to be 55.5wt....

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Abstract

The invention discloses a method for processing sludge employing biocide-coupled quick lime, and belongs to the technical field of sludge treatment. A lot of microorganism flocs are contained in sludge, a zoogloea structure is destroyed by adding a biocide and quick lime to release internal water, and the target of depth dehydration of the sludge can be achieved by adopting a filter press technology. The moisture content of a mud cake is 40-60wt% after the mud cake is treated with the method so that treatment requirements of the sludge can be met.

Description

technical field [0001] The invention relates to pretreatment of biochemical sludge with biocide and quicklime, and adopts filter press dewatering technology to realize deep dehydration of sludge, belonging to the technical field of sludge treatment. Background technique [0002] In recent years, with the continuous improvement of my country's urban sewage treatment rate, the surplus sludge output of urban sewage treatment plants has increased sharply, and more than 30 million tons of sludge with a moisture content of about 80wt.% are produced every year. At present, the total effective treatment and disposal rate of sludge in my country is only 5% to 10%, and most of the rest have not undergone standardized treatment and disposal. Common sludge treatment methods mainly include sanitary landfill, land use, thermal drying and incineration. These treatment methods have certain requirements on the moisture content of sludge. The lower the moisture content, the lower the cost of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/14
CPCC02F11/122C02F11/14C02F2303/04
Inventor 孙承林于杨蒋文天卫皇曌余丽刘培娟赵颖
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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