Urban sludge chemical curing method

A technology of urban sludge and solidification method, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of urban sludge environmental pollution, etc., and achieve the effect of reducing landfill area, low treatment cost, and reducing amount of treatment.

Inactive Publication Date: 2009-06-17
深圳市津港环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to solve the above-mentioned problems in the existing municipal sludge treatment methods, to provide a method that can effectively dispose of municipal sludge, realize the harmless and reduced disposal of sludge, and solve the problem of urban sludge environment. Municipal Sludge Chemical Solidification Method for Pollution Problems

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  • Urban sludge chemical curing method

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Embodiment 1

[0040] The municipal sludge chemical solidification method of the present embodiment is as follows:

[0041]The water content of the municipal sludge in this embodiment is 80%, and the contents of heavy metals such as copper and nickel are shown in Table 2. The urban sludge sludge cake is transported to the sludge physical and chemical disposal workshop through a closed tanker, poured into the sludge hopper, and starts the screw conveyor at the lower part of the sludge hopper, adjusts the screw conveyor motor speed, and controls the sludge discharge speed. The municipal sludge continuously flows into the closed twin-shaft mixer; at the same time, the quicklime powder with an activity index of 250 is continuously transported from the storage tank to the closed twin-shaft mixer through a screw metering device and mixed with the municipal sludge evenly. The amount of urban sludge added to the closed twin-shaft mixer is 5 tons, and the amount of quicklime powder added is 0.35 tons...

Embodiment 2

[0050] The municipal sludge chemical solidification method of the present embodiment is as follows:

[0051] The water content of the municipal sludge in this embodiment is 80%, and the contents of heavy metals such as copper and nickel are shown in Table 2. The urban sludge sludge cake is transported to the sludge physical and chemical disposal workshop through a closed tanker, poured into the sludge hopper, and starts the screw conveyor at the lower part of the sludge hopper, adjusts the screw conveyor motor speed, and controls the sludge discharge speed. The municipal sludge is continuously flowed into the closed twin-shaft mixer; at the same time, the quicklime powder crystals with an activity index of 250 are measured by the screw metering device and continuously transported from the storage tank to the closed twin-shaft mixer to mix with the municipal sludge evenly. The amount of urban sludge added to the closed twin-shaft mixer is 5 tons, and the amount of quicklime pow...

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Abstract

The invention relates to a method for curing urban sludge by a chemical method. The method comprises the following steps: quicklime powder is added into the urban sludge to destroy a micelle structure of the urban sludge, reduce moisture content of the sludge and realize sterilization, deodorization and dehydration of the urban sludge; stable materialized sludge is obtained; the materialized sludge is subjected to a stacking, airing or drying process; the water content is reduced to 10 to 20 percent to realize further dehydration of the sludge; the dehydrated sludge is broken into granular or powdery sludge; the PH value of the sludge is regulated; and the sludge is compacted and buried. The method can effectively treat the urban sludge, realize harmless and reducing treatment of the sludge, solve the problem of environmental pollution of the urban sludge and meet requirement of sustainable development concept of the environmental protection industry.

Description

technical field [0001] The invention relates to a treatment method of municipal sludge. Background technique [0002] Municipal sludge is solid waste generated during the treatment of sewage by municipal sewage treatment plants. These substances not only have high water content (70-80%), are perishable, and produce stench, but also contain a large number of pathogenic bacteria, parasite eggs, heavy metal substances (zinc, copper, nickel, lead, chromium, mercury, etc.) and polychlorinated biphenyls, Dioxins and other toxic and harmful carcinogens that are difficult to degrade. If it is discharged without treatment, the sludge will be soaked, eroded and leaked by rainwater, which will easily cause secondary pollution to groundwater, soil, etc., and directly endanger human health. [0003] With the continuous improvement of urban sewage treatment rate, the construction of sewage treatment plants is increasing, the output of urban sludge is increasing, and many cities have slu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 李兴章乃千林旭生卢归周良宏周世清江仁斌
Owner 深圳市津港环保技术有限公司
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