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Inorganic composite conditioner and sludge dewatering method thereof

An inorganic composite and conditioning agent technology, applied in the direction of dehydration/drying/thickened sludge treatment, etc., can solve the problems of complex preparation process and achieve the effect of improving dehydration performance

Inactive Publication Date: 2009-04-01
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its processing object is concentrated sludge, and the composition of composite filter aid includes as many as 9 kinds, and the preparation process is complicated

Method used

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  • Inorganic composite conditioner and sludge dewatering method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The raw material components and percentage weight ratio of the inorganic composite conditioner are: 17% of fly ash and 83% of quicklime.

[0026] The dehydration method is as follows: add 6% inorganic composite conditioner to the remaining sludge in the secondary settling tank and stir to make the conditioner and sludge evenly mixed, then enter the plate and frame filter press through the sludge pump for dehydration, and obtain a sludge with a moisture content of 57.6%. Mud cake. The adjusted sludge specific resistance is 1.33×10 7 S 2 / g.

Embodiment 2

[0028] The raw material components and percentage weight ratio of the inorganic composite conditioner are: 37.5% of fly ash and 62.5% of quicklime.

[0029] The dehydration method is

[0030] Add 8% inorganic composite conditioner to the remaining sludge in the secondary settling tank and stir to make the conditioner and sludge evenly mixed, then enter the sludge dehydrator through the sludge pump for dehydration, and obtain a mud cake with a moisture content of 52.4%. The adjusted sludge specific resistance is 1.3×10 7 S 2 / g.

Embodiment 3

[0032] The raw material components and percentage weight ratio of the inorganic composite conditioner are: 50% of fly ash and 50% of quicklime.

[0033] The dehydration method is:

[0034] Add 10% inorganic composite conditioner to the residual sludge in the secondary settling tank and stir to make the conditioner and sludge evenly mixed, then enter the plate and frame filter press for dehydration through the sludge pump, and obtain a mud cake with a moisture content of 49.25%. The adjusted sludge specific resistance is 5.7×10 6 S 2 / g.

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Abstract

The invention discloses an inorganic composite conditioner and a method for dehydrating the sludge thereof. The inorganic composite conditioner for dehydrating sludge comprises fly ash and calces, wherein, the weight percent of the fly ash is 17-75%, and the left is calces. For the optimized improvement, the weight percent of fly ash is 37.5-64%. The dehydration method comprises the following steps: (1) adjusting quality: the inorganic composite conditioner with right amount is weighted and is added in the sludge for evenly stirring, and the weight percent of the added inorganic composite conditioner is 6-20%; (2) dehydration: the sludge mixing liquid which is stirred evenly after adjusting quality is dehydrated mechanically. The water content rate of mud cake after dehydrating the sludge can be decreased to 45-60%. The specific resistance of the sludge is decreased to 10<6>-10<7>S<2> / g. The beneficial effects of the invention are that the effect of dehydration is good, time of dehydration is short, industrial waste residue can be utilized effectively, after dehydration, the mud cake can be taken as the raw material for preparing construction material.

Description

technical field [0001] The invention belongs to the technical field of urban domestic sewage sludge treatment, and in particular relates to the dehydration treatment of sludge by using an inorganic conditioning agent. Background technique [0002] Sludge is an inevitable product of urban domestic sewage treatment. It contains a large amount of organic matter, has a high moisture content, is perishable, has a strong odor, and also contains harmful substances such as heavy metals, pathogenic bacteria, and pathogenic bacteria. With the popularization and promotion of sewage treatment, the amount of sludge produced is increasing, and the problem of sludge safety and sanitation disposal has become increasingly prominent. The treatment and disposal of sludge has become a bottleneck problem that needs to be solved urgently. [0003] At present, the sludge disposal methods mainly include sanitary landfill, composting for agriculture and incineration. Whether it is incinerated, lan...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 杨家宽梁梅刘万超肖波杨海玉杨自荣杨晓吴莹莹
Owner HUAZHONG UNIV OF SCI & TECH
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