CN104888502A - Segmental sludge high dryness pressing method - Google Patents
Segmental sludge high dryness pressing method Download PDFInfo
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- CN104888502A CN104888502A CN201510249039.1A CN201510249039A CN104888502A CN 104888502 A CN104888502 A CN 104888502A CN 201510249039 A CN201510249039 A CN 201510249039A CN 104888502 A CN104888502 A CN 104888502A
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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
The invention belongs to field of sludge treatment, be specifically related to a kind of segmented sludge high-drying pressing method.
Background technology
In field of sludge treatment, mud after treatment finally needs to carry out high level cadre's dehydration makes dry wet separating substances, so that follow-up landfill or recycling.At present, the high level cadre for mud dewaters and usually adopts filter press to carry out, and in dehydration, produces squeeze pressure, act on the filter plate device of filter sludge by hydraulic jack or other mechanical systems.Due to the effect of pressure, filter plate device chamber portions is reduced, force mud to produce be separated with free water, capillary water, Interstitial Water, finally obtain high level cadre's mud cake of dehydrating and curing.
Existing filtering equipment is main in pressurization adopts continous way boosting method, and the pressure produced by hydraulic jack or other mechanical systems directly acts on filter plate device, and pressure curve is uninterrupted growth pattern continuously.The defect of this kind of continous way boosting method is: first, and the mud mixture in filter plate device is in pressure increase state always, is unfavorable for mud and capillary water, being separated of Interstitial Water, and makes the moisture content of the cake that finally obtains higher; Secondly, in whole pressurization cycle, when entering voltage stabilizing squeezing, squeeze pressure reaches upper pressure limit, is unfavorable for the discharge of mud cake internal moisture; 3rd, in expressing process, hydraulic means is in supercharging duty always, is unfavorable for hydraulic system equalized temperature, easily produces temperature rise comparatively greatly, damages hydraulic component.
Summary of the invention
According to moisture effusion feature in mud, the object of this invention is to provide a kind of segmented sludge high-drying pressing method being conducive to dredging filtrate overflow channel, improve dehydrating effect, effectively reduce moisture content of the cake.
For achieving the above object, the invention provides following technical scheme: a kind of segmented sludge high-drying pressing method, this method adopts filter press to carry out high level cadre's dehydration to the mud obtained after sludge modification process, and described filter press applied pressure value is in time in fluctuation deformation.
Technique effect of the present invention is: by the pressure of fluctuation-type, the mud in filter plate device is made to be that periodicity compresses, relaxation state, be conducive to mud and capillary water, being separated and extruding of Interstitial Water, mud cake moisture content that is inner and outer surface is reached unanimity, improve dehydrating effect, reduce the rear moisture content of the cake of dehydration.
Accompanying drawing explanation
Fig. 1 is the pressure time curve of the embodiment of the present invention 1;
Fig. 2 is the pressure time curve of the embodiment of the present invention 2;
Detailed description of the invention
As shown in Figure 1-2, a kind of segmented sludge high-drying pressing method, this method adopts filter press to carry out high level cadre's dehydration to the mud obtained after sludge modification process, and described filter press applied pressure value P in time t is fluctuation deformation.By the pressure of fluctuation-type, make mud in filter plate device in periodically compressing, relaxation state, be conducive to mud and capillary water, being separated and extruding of Interstitial Water, mud cake moisture content that is inner and outer surface reached unanimity, improve dehydrating effect, reduce the rear moisture content of the cake of dehydration.
Embodiment 1
As shown in Figure 1, whole expressing process is divided into multiple time period t 1-t2, t2-t3, t3-t4 ... average pressure in the same time period is definite value, if the average pressure in the t2-t3 time period is P2, actual pressure value P in this time period t 2-t3 is with the average pressure P2 of this time period for benchmark fluctuates up and down, and its fluctuation range is ± △ P
b; The average pressure P2 of this time period is greater than the average pressure P1 of its previous time period t1-t2, is less than the average pressure P3 of a time period t3-t4 thereafter, i.e. P1 < P2 < P3.
Further, the pressure peak in the described same time period is all equal with valley, and this peak value and valley are greater than peak value and the valley of previous time period, and is less than peak value and the valley of a rear time period.
Preferably, the rising edge mean change speed of pressure oscillation curve is less than trailing edge mean change speed.
This curve realizes by PLC program or other control methods, and setting value in a program comprises: the single squeezing cycle; Each segmentation squeezing time t
2-t
1, t
3-t
2, t
4-t
3average squeeze pressure (P in each segmentation
1, P
2, P
3p
m); Fluctuation squeeze pressure scope △ P in each segmentation
a, △ P
b, △ P
c△ P
n; The undulating manner of each period of waves linearly fluctuates, nonlinear wave; The rising edge of each period of waves and trailing edge speed.
Embodiment 2
As shown in Figure 2, described pressure P is intermittent change, leaves certain dwell time t ＇, t when pressure P is between crest and/or trough and/or peak valley " provide time enough so that redistribute for moisture or overflow.
Except the linear wave that above-described embodiment 1,2 adopts, the present invention can also adopt nonlinear wave, as sine wave, exponential function ripple etc.
Claims (5)
1. a segmented sludge high-drying pressing method, this method adopts filter press to carry out high level cadre's dehydration to the mud obtained after sludge modification process, it is characterized in that: described filter press applied pressure value is in time in fluctuation deformation.
2. segmented sludge high-drying pressing method according to claim 1, it is characterized in that: whole expressing process is divided into multiple time period, average pressure in the same time period is definite value, the actual pressure in this time period with the average pressure of this time period for benchmark fluctuates up and down; The average pressure of a time period is greater than the average pressure of its previous time period, is less than the average pressure of a time period thereafter.
3. segmented sludge high-drying pressing method according to claim 2, it is characterized in that: the pressure peak in the described same time period is all equal with valley, this peak value and valley are greater than peak value and the valley of previous time period, and are less than peak value and the valley of a rear time period.
4. segmented sludge high-drying pressing method according to claim 3, is characterized in that: the rising edge mean change speed of pressure oscillation curve is less than trailing edge mean change speed.
5. segmented sludge high-drying pressing method according to claim 4, is characterized in that: described pressure is intermittent change, leaves certain dwell time when pressure is between crest and/or trough and/or peak valley.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510249039.1A CN104888502A (en) | 2015-05-15 | 2015-05-15 | Segmental sludge high dryness pressing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510249039.1A CN104888502A (en) | 2015-05-15 | 2015-05-15 | Segmental sludge high dryness pressing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104888502A true CN104888502A (en) | 2015-09-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510249039.1A Pending CN104888502A (en) | 2015-05-15 | 2015-05-15 | Segmental sludge high dryness pressing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105561645A (en) * | 2016-01-25 | 2016-05-11 | 佛山市金凯地过滤设备有限公司 | Toothed pressure-maintaining filter-pressing method and equipment |
| CN106587563A (en) * | 2016-12-14 | 2017-04-26 | 安徽省通源环保科技有限公司 | High-dryness squeezing method for sludge |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2016942A (en) * | 1977-11-09 | 1979-10-03 | Kuebler H | A method of and an apparatus for expressing liquid from clarifying sludges |
| EP0027910B1 (en) * | 1979-10-03 | 1984-07-04 | Hans Kübler | Process for squeezing sewage sludges by means of a chamber filter press |
| CN101367599A (en) * | 2008-09-17 | 2009-02-18 | 广州绿由工业弃置废物回收处理有限公司 | Surfactant for sludge dewatering and sludge dewatering method |
| CN102225258A (en) * | 2011-05-13 | 2011-10-26 | 黄建宏 | Dynamic balancing filter-pressing method |
-
2015
- 2015-05-15 CN CN201510249039.1A patent/CN104888502A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2016942A (en) * | 1977-11-09 | 1979-10-03 | Kuebler H | A method of and an apparatus for expressing liquid from clarifying sludges |
| EP0027910B1 (en) * | 1979-10-03 | 1984-07-04 | Hans Kübler | Process for squeezing sewage sludges by means of a chamber filter press |
| CN101367599A (en) * | 2008-09-17 | 2009-02-18 | 广州绿由工业弃置废物回收处理有限公司 | Surfactant for sludge dewatering and sludge dewatering method |
| CN102225258A (en) * | 2011-05-13 | 2011-10-26 | 黄建宏 | Dynamic balancing filter-pressing method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105561645A (en) * | 2016-01-25 | 2016-05-11 | 佛山市金凯地过滤设备有限公司 | Toothed pressure-maintaining filter-pressing method and equipment |
| CN106587563A (en) * | 2016-12-14 | 2017-04-26 | 安徽省通源环保科技有限公司 | High-dryness squeezing method for sludge |
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| C06 | Publication | ||
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| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150909 |
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| RJ01 | Rejection of invention patent application after publication |