Sludge composite conditioner and conditioning method using same

A conditioner and sludge technology, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of failing to meet the requirements of resource utilization, difficulty in removing organic cells, and expensive conditioning costs, so as to reduce sludge dehydration Cost, good dehydration effect, low price effect

Inactive Publication Date: 2014-03-12
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sludge often contains a large amount of organic matter, and it is difficult for such agents to remove the surface-bound water and internal water of organic matter cells, resulting in the water content of the mud cake after sludge dehydration is still 75% to 80%, which is difficult to further reduce, and the conditioning cost is expensive
According to my country's relevant sludge standards and technical policies, although the moisture content of sludge reduced to 80% can meet the requirements of sludge from urban sewage treatment plants, it is far from landfill (moisture content <60%), self-sustaining incineration (moisture content) <50%), agricultural use (moisture content <60%), land improvement (moisture content <65%) and other disposal or resource utilization requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Taking the sludge in the sludge concentration tank of a sewage treatment plant as the conditioning object, the analysis shows that the moisture content of the sludge is 97.2%, and the organic matter (VSS) content of the dry sludge is 42.9%. The experimental results show that according to the ratio of 1.2 mmol of conditioner A, 1.6 mmol of conditioner B and 1.8 mmol of conditioner C per gram of VSS, calculate and weigh / measure conditioners A, B and C respectively, and add them to the sludge , mechanically stirred for 5 min, and centrifuged for dehydration. The moisture content of the mud cake was measured to be 55.6%.

Embodiment 2

[0013] Taking the filter press sludge in the sludge dewatering workshop of a sewage treatment plant as the conditioning object, the analysis shows that the moisture content of the sludge is 78.6%, and the organic matter (VSS) content of the dry sludge is 35.2%. During the experiment, first add deionized water to the sludge and stir evenly to prepare sludge with a water content of 99%. The experimental results show that according to the ratio of 2.6 mmol of conditioner A, 2.5 mmol of conditioner B and 1.8 mmol of conditioner C per gram of VSS, calculate and weigh / measure conditioners A, B and C respectively, and add them to the sludge After mechanical stirring for 2 min, the moisture content of the mud cake was measured to be 50.1% after vacuum filtration.

Embodiment 3

[0015] Taking the oily sludge of a factory as the conditioning object, the analysis shows that the moisture content of the sludge is 84.0%, and the organic matter (VSS) content of the dry sludge is 77.3%. The experimental results show that according to the ratio of 2.8 mmol of conditioner A, 2.7 mmol of conditioner B and 2.9 mmol of conditioner C per gram of VSS, the conditioners A, B and C were calculated and weighed / measured, and mechanically stirred for 9 minutes. After centrifugal dehydration, the moisture content of the mud cake was measured to be 58.9%.

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Abstract

The invention belongs to the technical field of sludge treatment devices and particularly relates to a sludge composite conditioner and a conditioning method using the same. The sludge composite conditioner disclosed by the invention consists of conditioners A, B and C, wherein major components of the conditioners A, B and C are respectively hydrogen peroxide, ferrite and persulfate. The specific conditioning method comprises the following steps: (1), analyzing content of volatile suspended solid (VSS) in sludge, and calculating and respectively weighing/measuring a certain amount of the conditioners A, B and C according to a rule that every gram of VSS needs 1mmol-3mmol of the conditioner A, 1mmol-3mmol of the conditioner B and 1mmol-3mmol of the conditioner C; (2), adding the weighed/measured conditioners A, B and C into the sludge, and carrying out mechanical dehydrating operation onto the sludge after stirring for 1 minute-10 minutes. The method disclosed by the invention is simple, dosage of conditioners is less, cost is low, dehydrating effect is obvious, and sludge moisture content can be lowered to less than 60% from 97%-99%; after being dehydrated, the sludge can be directly filled and buried, applied in agriculture or used for producing building materials, and the like.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and disposal, and relates to a sludge composite conditioner and a conditioning method thereof. Background technique [0002] In recent years, with the improvement of various sewage and wastewater treatment rates and the increase of treatment depth in our country, the sludge production is increasing. According to incomplete statistics, in 2012, the sludge (calculated with a water content of 80%) produced by my country's urban sewage treatment plants alone exceeded 25 million tons, and the annual growth rate was greater than 10%. Sludge often contains a large amount of organic matter, high moisture content, and poor dehydration performance, which seriously affects the subsequent treatment and disposal of sludge. Sludge conditioning can improve the dewatering performance of sludge, and it is the most important pretreatment process to improve the treatment and disposal effect and resource ut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 蒋家超沈森源毛缜商晓甫甄广印赵由才
Owner CHINA UNIV OF MINING & TECH
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