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Sludge high-dry dehydration conditioning method

A sewage treatment plant and sludge technology, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of inability to realize effective utilization of resources, increase sludge treatment costs, and destroy affinity, so as to achieve effective utilization of resources, The effect of reducing secondary pollution, reducing time and pressure

Inactive Publication Date: 2015-07-22
安徽省通源环境节能股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, enterprises mainly use mechanical methods to dehydrate excess sludge, but the solid matter in excess sludge has a certain affinity with water, so the dehydration effect of purely mechanical methods is poor. Add some conditioning agents to the sludge to destroy the affinity between the sludge and water, so that the mechanical dehydration effect of the sludge can be effectively improved
[0003] In the prior art, enterprises mostly use a mixture of ferric chloride and quicklime as a conditioner to add to the sludge. However, in practical applications, it has been found that the mud cake obtained by using this method will be used in subsequent composting, incineration and land use. There are certain limitations in utilization and other aspects, especially in the incineration process, a large amount of dioxin will be produced, so the mud cake obtained by dehydration after conditioning by the above method is mostly disposed of in landfill, which not only cannot realize the effective utilization of resources , and undoubtedly increased the cost of sludge treatment

Method used

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Experimental program
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Effect test

Embodiment 1

[0011] Embodiment 1: the dehydration treatment of sludge

[0012] According to the data disclosed in Table 1, ferric chloride and quicklime were added to the sludge, mixed and stirred, and then the mixture was dehydrated by pressure filtration through a plate-and-frame filter to obtain mud cake 1, wherein, the input of ferric chloride and quicklime The adding ratio is the ratio added to the dry sludge, and the working pressure of the plate and frame filter press is 5.0Mpa.

[0013] Table 1 Experimental data

[0014]

Embodiment 2

[0015] Embodiment 2: the dehydration treatment of sludge

[0016] According to the data disclosed in Table 2, polyferric salt and plant ash are added to the sludge, mixed and stirred, and then the mixture is dehydrated by pressure filtration through a plate and frame filter to obtain mud cake 2, wherein the dosage of polyferric salt and plant ash The working pressure of the plate and frame filter press is 4.0Mpa for the ratio of adding to the dry sludge.

[0017] Table 2 Experimental data

[0018]

[0019] The mud cake 1,2 that obtains in embodiment 1,2 is analyzed and detected, gets the average value of each detection value, specifically as shown in table 3 below, can find out from the table: 1) " polyferric salt+plant ash " as In the conditioner, the calorific value of mud cake 2 increased by 317kcal / kg compared with mud cake 1, and the conditioner of mud cake 2 did not use ferric chloride, which reduced the chlorine content in the mud cake and effectively reduced the am...

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Abstract

The invention discloses a sludge high-dry dehydration conditioning method. The sludge high-dry dehydration conditioning method comprises the following steps: preparing sludge, polymer ferric salt and plant ashes according to a ratio of parts by weight of 1000:(5-7):(30-50), mixing and stirring the materials, and mechanically filter pressing and dehydrating the mixture to obtain mud cakes, wherein the sludge is from a sewage treatment plant, the moisture content of the sludge ranges from 90% to 99%; the ratio of parts by weight of 1000:(5-7):(30-50) is based on the absolute dry weight of the sludge. The polymer ferric salt and the plant ashes are used as conditioning agents to condition and modify the sludge, so that the cost is low; the moisture content of the mud cakes after dehydration is about 50%, and meets the follow-up treatment requirement; furthermore, the aspects of organic content, calorific value and pH value of the mud cakes are improved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a high-dry sludge dehydration conditioning method. Background technique [0002] With the rapid development of social economy and urbanization, the number and scale of construction of urban sewage treatment plants are constantly increasing, which leads to the generation of surplus sludge (that is, the sludge discharged from the primary sedimentation tank) of sewage treatment plants The amount is also increasing, and the moisture content of the remaining sludge is high, so it needs to be dehydrated in depth to reduce the volume of the sludge, thereby reducing the difficulty of subsequent sludge treatment. At present, enterprises mainly use mechanical methods to dehydrate excess sludge, but the solid matter in excess sludge has a certain affinity with water, so the dehydration effect of purely mechanical methods is poor. Add some conditioning agents to the sludge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/14
Inventor 刘帮樑嵇萍杨明周强李波鲍家华叶传德郑杰吴克俞志敏董强
Owner 安徽省通源环境节能股份有限公司
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