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Sludge dry powder and preparation method thereof

A technology of sludge dry powder and sludge, applied in the field of environmental science, can solve problems such as difficulty in urban sludge treatment

Inactive Publication Date: 2012-03-21
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

Examples

Experimental program
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Effect test

Embodiment 1

[0016] The digested sludge obtained from a domestic sewage treatment plant has a moisture content of 80.4%wt; the rice husk ash is obtained from the ash after burning rice husk in an industrial boiler. Mix the sludge containing domestic water, rice husk ash and deodorizing bactericide calcium oxide according to the proportion, and then dry naturally. The drying method is as follows: drying: drying on the concrete floor, the thickness of the mixture is about 10cm, at the highest temperature of 27 ℃, drying for 10 hours on a sunny day, turning once an hour. Flue gas residual heat: Dry the flue gas with residual heat at 180°C for 1 hour. A tunnel-type 12kw microwave dryer was used to irradiate for 4 minutes. See Table 1 for specific data.

[0017] Table 1

[0018] sludge volume

Embodiment 2

[0020] Sludge taken from a paper mill after sewage treatment had a moisture content of 67.3% wt. Mix the paper-making sludge, conditioning agent and deodorizing bactericide calcium oxide uniformly according to the proportion, and then dry naturally. The types and specific ratios of conditioning agents are shown in Table 2. The drying conditions are as follows: drying on the concrete floor, the thickness of the mixture is about 10cm, at the highest temperature of 28°C, drying for 10 hours on a sunny day, turning once an hour.

[0021] Table 2

[0022]

Embodiment 3

[0024] The sludge after sewage treatment from a printing and dyeing enterprise has a moisture content of 70.4%wt. The paper-making sludge, rice husk ash and deodorizing bactericide are mixed evenly in proportion, and then dried to obtain sludge dry powder. The drying conditions are: dry on the concrete floor, the thickness of the mixture is about 10cm, at the highest temperature of 27 ℃, dry for 10 hours on a sunny day, and turn it once an hour. 140 ℃ boiler waste heat drying for 1h. A tunnel-type 12kw microwave dryer was used to irradiate for 4 minutes. See Table 3 for specific data.

[0025] table 3

[0026]

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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 directsanitary 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 is the solid sediment produced during the sewage treatment process, which contains 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 it is not properly disposed of, it will not only occupy a large amount of land, but also cause secondary pollution to the environment, becoming a major public hazard affecting urban environmental sanitation. How to scientifically and properly treat and dispose of sludge has become a key issue that must be solved for urban development. Comprehensive domestic and foreign sludge processing technologies, mo...

Claims

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Application Information

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Patent Type & Authority Patents(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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