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Method for drying sludge

A technology of sludge drying and sludge, which is applied in the direction of sludge drying, preliminary treatment of promoting the drying of solid materials, drying of solid materials, etc., can solve problems such as large sites, and achieve energy saving, water reduction, and The effect of energy consumption

Active Publication Date: 2008-07-23
SWISON CREATIVE ENVIRONMENTAL SOLUTIONS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aerobic maturation of this technical method requires a large site, and the sludge moisture content of 20-25% through natural drying is greatly affected by climate conditions.

Method used

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  • Method for drying sludge
  • Method for drying sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The sludge filter cake unloaded from the plate-and-frame filter press (sludge after press filter dehydration), with a water content of 65%, is transported to the stirring and mixing device by a screw conveyor, and is transported from the dry material bin to the stirring and mixing device. Dry sludge with a moisture content of 1.8% was mixed. The conveying speed of dry sludge is 14kg / min, the dry-wet ratio is set to 1.15:1, the conveying speed of wet (after dehydration) sludge is 12kg / min, and the water content of the mixed sludge discharged from the mixing device after mixing is 31%. . Part of the mixed sludge is used as a carrier for sludge drying to continue drying; the other part is used as a finished product package after drying, and the moisture content of the finished sludge after drying is 31%.

Embodiment 2

[0058] The sludge filter cake unloaded from the plate-and-frame filter press (sludge after press filter dehydration), with a moisture content of 51%, is transported to the mixing device by a screw conveyor, and is transported from the dry material bin to the mixing device. The dried sludge with a moisture content of 2.1% was mixed. The conveying speed of the dry sludge is 14kg / min, the dry-wet ratio is set to 0.8:1, the conveying speed of the wet sludge is about 17.5kg / min, and the moisture content of the mixed sludge discharged from the stirring and mixing device is 29%. Part of the mixed sludge is used as a carrier for sludge drying to continue drying; the other part is used as a finished product package after drying, and the moisture content of the finished sludge after drying is 29%.

Embodiment 3

[0060] The sludge filter cake unloaded from the plate-and-frame filter press (sludge after press filtration and dehydration), with a moisture content of 58%, is transported to the stirring and mixing device by a screw conveyor, and is transported from the dry material bin to the stirring and mixing device. The dried sludge with a moisture content of 2.5% was mixed. The conveying speed of dry sludge is 12kg / min, the dry-wet ratio is set to 0.9:1, the conveying speed of wet sludge is about 13.3kg / min, and the moisture content of the mixed sludge discharged from the stirring and mixing device is 32%. Part of the mixed sludge is used as a carrier for sludge drying to continue drying; the other part is used as a finished product package after drying, and the moisture content of the finished sludge after drying is 32%.

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Abstract

The invention discloses a sludge drying method for treating sludge with different water content, which includes the following steps: (1) dry the dewatered sludge to be used as a dry support of the sludge; (2) transfer the dry support of the sludge and the dewatered sludge to be dried to a stirring and mixing device respectively for carrying out stirring and mixing to obtain mixed sludge; (3) transfer the mixed sludge to a drying device to be dried; (4) repeat step (2) and step (3); the invention is characterized in that the mixed sludge output from the stirring and mixing device in step (4) is taken out and transferred to the drying device to be dried according to the needed amount of sludge carrier when drying is carried out and becomes the dry support of the sludge; the residual part becomes the finished product. The invention provides a sludge drying method that is high in drying efficiency, low in energy consumption, short in drying time and low in investment and operation cost.

Description

technical field [0001] The invention belongs to the field of sludge treatment methods, and in particular relates to a sludge drying method capable of treating sludge with different water contents and reusing the treated sludge. Background technique [0002] At present, the method of sludge drying treatment is generally used at home and abroad to directly dry the dewatered sludge that has been dehydrated to a moisture content of 85-80% by centrifugal dehydration or dehydrated to a moisture content of 75-70% by plate and frame filtration: Method 1, The specific steps are as follows: first break up or extrude the dehydrated sludge into noodles, and then transport it to the drying device for drying. After drying through the drying device, the final product of drying - dried sludge, is generally dried. The moisture content of the sludge is about 10%; the second method, the specific steps are as follows: first transport the dehydrated sludge to the sludge drying device to break up...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/12
CPCC02F11/12F26B1/00F26B2200/18C02F11/13
Inventor 钟环声吴学伟孙志民李雷吴嘉聪杨海英
Owner SWISON CREATIVE ENVIRONMENTAL SOLUTIONS CO LTD
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