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Sludge dry powder and preparation method thereof

A technology of sludge dry powder and water sludge, applied in the field of environmental science, can solve the problems of difficult urban sludge treatment and so on

Inactive Publication Date: 2010-01-06
WUHAN GLT ENERGY & ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a kind of sludge dry powder and its preparation method aiming at the defects of existing sludge treatment methods, which solves the difficult problem of urban sludge treatment, realizes the purpose of waste utilization and environmental improvement

Method used

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  • Sludge dry powder and preparation method thereof
  • Sludge dry powder and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The digested sludge was taken from a domestic sewage treatment plant with a moisture content of 80.4%wt; the rice husk ash was taken from the ash after burning rice husks in an industrial boiler. Mix the sludge containing domestic water, rice husk ash and calcium oxide, a deodorizing fungicide, in proportion, and then dry it naturally. The drying method is: drying: drying on the cement floor, the thickness of the mixture is about 10cm, at the highest temperature of 27 ℃, drying on a sunny day for 10 hours, turning once every hour. Flue gas waste heat: 180 ℃ flue gas waste heat drying for 1h. A tunnel-type 12kw microwave dryer was used for 4min irradiation. The specific data are shown in Table 1.

[0017] Table 1

[0018] Sludge volume

Embodiment 2

[0020] The sludge was taken from a paper mill after sewage treatment with a moisture content of 67.3%wt. Mix the papermaking sludge, conditioner and deodorant and bactericide calcium oxide evenly in proportion, and then dry it naturally. The types and specific proportions of conditioners are shown in Table 2. The drying conditions are as follows: drying on the cement floor, the thickness of the mixture is about 10cm, at the highest temperature of 28 ℃, drying on a sunny day for 10 hours, and turning it every hour.

[0021] Table 2

[0022]

Embodiment 3

[0024] The sludge after sewage treatment was taken from a printing and dyeing enterprise with a moisture content of 70.4%wt. Mix the papermaking sludge, rice husk ash and deodorant bactericide evenly in proportion, and then dry to obtain dry sludge powder. The drying conditions are: drying on the cement floor, the thickness of the mixture is about 10cm, at the highest temperature of 27°C, drying for 10 hours on sunny days, and turning once every hour. 140℃ boiler waste heat drying for 1h. A tunnel-type 12kw microwave dryer was used for 4min irradiation. The specific data are shown in Table 3.

[0025] table 3

[0026]

[0027]

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Abstract

The invention discloses a method for preparing dry powder by sludge, which comprises the following steps: uniformly mixing the following components in percentage by weight: 50-85 percent of sludge containing 40-98 percent of water, 14-40 percent of conditioner and 1-10 percent of deodorizing bactericide at room temperature; and then, drying the mixture through airing or afterheat and the like to acquire the sludge dry powder. The invention solves the problem of difficult municipal sludge treatment, greatly reduces the cost for sludge dehydration and drying, and prepares the sludge into dry powder. The sludge dry powder can be used for land utilization, used as solid fuel with a low combustion value, used as the raw material for producing clay or bricks or concrete and also used for direct sanitary landfills.

Description

technical field [0001] The invention relates to a sludge treatment method in the field of environmental science and technology, in particular to a sludge dry powder and a preparation method thereof. Background technique [0002] Sludge wet solid precipitation material produced in the process of sewage treatment, containing a large amount of water, inorganic ash and organic volatiles. With the rapid development of social economy and urbanization, my country's urban sewage treatment capacity has been continuously enhanced, and the amount of sludge produced has increased sharply. If not properly disposed of, it will not only occupy a large amount of land, but also cause secondary pollution to the environment and become a major public hazard affecting urban environmental sanitation. How to deal with and dispose of sludge scientifically and properly has become a key problem that must be solved in urban development. Combining domestic and foreign sludge processing technologies, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 余国贤吴宏观
Owner WUHAN GLT ENERGY & ENVIRONMENTAL TECH CO LTD
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