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Method for harmlessly recycling sludge

A recycling and sludge technology, which is applied in the direction of chemical instruments and methods, combustion methods, sludge treatment, etc., can solve the problems of low incineration heat energy recovery, high management requirements, and large infrastructure investment, so as to achieve small investment and avoid secondary Effects of pollution and energy saving

Active Publication Date: 2011-06-01
湖南骏泰生物质发电有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The incineration method requires huge equipment, large infrastructure investment, high management requirements, and little recovery of incineration heat energy. If the sludge organic matter content is low and the moisture content is high, it is difficult to maintain spontaneous combustion, and fuel such as oil needs to be added, and the cost in the production process is high.

Method used

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  • Method for harmlessly recycling sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The mixed sludge from the primary sedimentation tank, oxidation ditch and advanced treatment air flotation tank with a moisture content of 98.5% enters the sludge concentration tank, and the sludge is concentrated to a moisture content of 94% through the sludge concentration tank; the sludge concentration tank has a moisture content of 94% The sludge is transported to the belt sludge dehydrator for dehydration treatment through pipelines. In the sludge conveying pipeline, the 3Add 25g of polyacrylamide flocculant to the sludge, and the water content of the dehydrated sludge will drop to 75%; the sludge with a water content of 75% will be sent to the sludge screw press for drying and dehydration treatment, and at the same time, it will be sent to the sludge screw press The hollow cavity of the screw blade of the press is fed with lime kiln flue gas at a temperature of 220°C. The moisture content of the sludge gradually decreases to 57% under the action of continuous compr...

Embodiment 2

[0024] The mixed sludge from the primary sedimentation tank, oxidation ditch and advanced treatment air flotation tank with a moisture content of 99% enters the sludge concentration tank, and the sludge is concentrated to a moisture content of 95% through the sludge concentration tank; the sludge concentration tank has a moisture content of 95% The sludge is transported to the belt sludge dehydrator for dehydration treatment through pipelines. In the sludge conveying pipeline, the 3 Add 20g of polyacrylamide flocculant to the sludge, and the water content of the dehydrated sludge will drop to 80%; the sludge with a water content of 80% will be sent to the sludge screw press for drying and dehydration treatment, and at the same time, it will be sent to the sludge screw press The hollow cavity of the screw blade of the press is fed with lime kiln flue gas at a temperature of 200°C. The moisture content of the sludge gradually decreases to 59% under the action of continuous compr...

Embodiment 3

[0026] The mixed sludge from the primary sedimentation tank, oxidation ditch and advanced treatment air flotation tank with a moisture content of 99.5% enters the sludge concentration tank, and the sludge is concentrated to a moisture content of 96% through the sludge concentration tank; the sludge concentration tank has a moisture content of 96% The sludge is transported to the belt sludge dehydrator for dehydration treatment through pipelines. In the sludge conveying pipeline, the 3 Add 35g of polyacrylamide flocculant to the sludge, and the water content of the dehydrated sludge will drop to 85%; the sludge with a water content of 85% will be sent to the sludge screw press for drying and dehydration treatment, and at the same time, it will be sent to the sludge screw press The hollow cavity of the screw blade of the press is fed with lime kiln flue gas at a temperature of 180°C. The moisture content of the sludge gradually decreases to 60% under the action of continuous com...

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Abstract

The invention relates to a method for harmlessly recycling sludge, comprising the following steps of: concentrating and dehydrating the sludge with a moisture content of 94%-96% to ensure that the moisture content is reduced to 75%-85%; desiccating and dehydrating the concentrated and dehydrated sludge to ensure that the moisture content is reduced to be not higher than 60%; mixing the desiccated and dehydrated sludge with biomass waste; and delivering the mixture into a circulating fluidized-bed biomass boiler for burning. The method is beneficial to the maintaining of spontaneous combustion of the sludge and can be used for recovering heat energy produced in the combustion process of the sludge in the mean time, and therefore, costs of sludge transportation and landfill are saved, the heat energy produced in the combustion process of the sludge can be recovered to produce steam so as to save energy, and the secondary pollution to environment, caused by landfill, can be avoided.

Description

technical field [0001] The invention relates to a method for harmless resource utilization of waste, in particular to a method for harmless resource utilization of sludge. Background technique [0002] With the continuous improvement of the domestic sewage treatment rate, the corresponding amount of sludge is also increasing. Each sewage treatment plant must discharge hundreds or even tens of thousands of tons of sludge with a moisture content of about 99% every day. The large amount of sludge produced has caused increasing Severe secondary pollution, sludge treatment technology has become the bottleneck of the sewage treatment industry, sludge treatment technology includes three aspects of sludge concentration, dehydration and drying technology. At present, after the sludge is concentrated and dehydrated, the water content can only be reduced to about 80%, which is inconvenient for incineration and composting, and it is difficult to achieve harmless resource utilization. A...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/12F23G5/46F23G5/00
Inventor 周鲲鹏陈敏吴健吴望
Owner 湖南骏泰生物质发电有限责任公司
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