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Segmental sludge high dryness pressing method

A segmented, sludge technology, applied in separation methods, chemical instruments and methods, filtration and separation, etc., can solve problems such as damage to hydraulic components, unfavorable discharge of mud cake moisture, unfavorable hydraulic system temperature balance, etc. Moisture content, the effect of improving the dehydration effect

Inactive Publication Date: 2015-09-09
安徽省通源环境节能股份有限公司
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this continuous pressurization method are: firstly, the mud-water mixture in the filter plate device is always in a state of increasing pressure, which is not conducive to the separation of sludge from capillary water and interstitial water, so that the moisture content of the final mud cake is relatively high ; secondly, during the entire pressurization cycle, when entering the steady pressure press, the press pressure has reached the pressure limit, which is not conducive to the discharge of water inside the mud cake; thirdly, during the press process, the hydraulic device is always in pressurized working state, It is not conducive to the temperature balance of the hydraulic system, and it is easy to cause a large temperature rise and damage the hydraulic components

Method used

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Experimental program
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Effect test

Embodiment 1

[0011] Such as figure 1 As shown, the entire pressing process is divided into multiple time periods t1-t2, t2-t3, t3-t4..., the average pressure in the same time period is a constant value, such as the average pressure in the t2-t3 time period is P2, the The actual pressure value P within the time period t2-t3 fluctuates up and down based on the average pressure P2 of this time period, and its fluctuation range is ±△P b ; The average pressure P2 of this period is greater than the average pressure P1 of the previous period t1-t2, and less than the average pressure P3 of the subsequent period t3-t4, that is, P1

[0012] Further, the peak value and valley value of the pressure in the same time period are equal, and the peak value and valley value are greater than the peak value and valley value of the previous time period, and smaller than the peak value and valley value of the subsequent time period.

[0013] Preferably, the average rate of change of the rising edge of t...

Embodiment 2

[0016] Such as figure 2 As shown, the pressure P changes intermittently, and when the pressure P is between the peak and / or valley and / or peak valley, a certain holding time t', t" is reserved to facilitate the redistribution or overflow of water Provide enough time.

[0017] In addition to the linear waves used in the above-mentioned embodiments 1 and 2, the present invention can also use nonlinear waves, such as sine waves, exponential function waves, and the like.

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Abstract

Belonging to the field of sludge treatment, the invention in particular relates to a segmental sludge high dryness pressing method. The method adopts a filter press to conduct high dryness dehydration on the slurry obtained by modification treatment of sludge, and the pressure value applied by the filter press shows fluctuating change over time. By means of the fluctuating pressure change, the sludge in a filter plate device is in a periodic compressed and relaxed state, thus being conducive to separation and extrusion of sludge and capillary water, interstitial water. The moisture content in the mud cake and the moisture content on the outer surface can tend to be uniform, and the mud cake moisture content can be reduced.

Description

technical field [0001] The invention belongs to the field of sludge treatment, and in particular relates to a segmented sludge high-dry pressing method. Background technique [0002] In the field of sludge treatment, the treated sludge needs to be dehydrated to separate dry and wet substances for subsequent landfill or recycling. At present, the high-dry dehydration of sludge is usually carried out by a filter press. During the dehydration process, hydraulic cylinders or other mechanical methods generate squeezing pressure, which acts on the filter plate device for filtering sludge. Due to the effect of pressure, the volume of the inner cavity of the filter plate device is reduced, forcing the sludge to separate from free water, capillary water, and interstitial water, and finally a dehydrated and solidified high-dry mud cake is obtained. [0003] Existing filter press equipment mainly adopts a continuous pressurization method during the pressurization process. The pressure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D25/12
Inventor 刘帮樑嵇萍杨明夏劲松周强李波鲍家华叶传德叶翠云吴克俞志敏
Owner 安徽省通源环境节能股份有限公司
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