CN105800891A - Electroosmosis and mechanical filter-pressing coupled sewage sludge dewatering method - Google Patents
Electroosmosis and mechanical filter-pressing coupled sewage sludge dewatering method Download PDFInfo
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- CN105800891A CN105800891A CN201610315491.8A CN201610315491A CN105800891A CN 105800891 A CN105800891 A CN 105800891A CN 201610315491 A CN201610315491 A CN 201610315491A CN 105800891 A CN105800891 A CN 105800891A
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- dewatering
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- sewage sludge
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
Abstract
The invention discloses an electroosmosis and mechanical filter-pressing coupled sewage sludge dewatering method which comprises the following steps: (1) a primary mechanical filter-pressing dewatering stage: the sewage sludge enters a primary filter-pressing dewatering device, and the primary mechanical filter-pressing dewatering is realized in the primary filter-pressing dewatering device; (2) an electroosmosis and mechanical filter-pressing coupled dewatering stage: the anode plate and cathode plate of electroosmosis are arranged in a coupled dewatering cylinder, and a direct-current power supply supplies power to the anode plate and cathode plate of electroosmosis, the anode plate and cathode plate form a press-filtering cavity with the coupled dewatering cylinder, and mechanical filter-pressing between the anode plate and cathode plate is maintained while electroosmosis dewatering is realized; and (3) a high-pressure mechanical filter-pressing dewatering stage: the sludge water content of the anode plate is low; and at the moment, the direct-current power supply is cut off, the electroosmosis dewatering is stopped, and pressure between the anode plate and cathode is increased to realize high-pressure mechanical filter-pressing dewatering. By adopting the method disclosed by the invention, the sludge resistance of the anode layer is increased slowly, the dewatering effect is good, and the water content in the sludge thickness direction is in uniform distribution.
Description
Technical field
The present invention relates to sewage sludge process field, the sewage sludge dewatering that specifically a kind of electro-osmosis couples with mechanism filter-pressing.
Background technology
Mud high-moisture percentage is the bottleneck that govern specific resistance to filtration, the mud that moisture content is high is not only bulky, and contained a large amount of organic, heavy metal and harmful microorganism, easily degenerate or be discharged in environment, cause secondary pollution, the follow-up landfill of mud, burning, recycling etc. are all adversely affected.Therefore, deeply dehydrating sludge minimizing is Treatment of Sludge primary and foremost purpose, and minimizing is the basis realizing mud other " three change ", and mud is more dry, and subsequent treatment is disposed more favourable.
Electroosmotic dewatering technology make use of the special double electrical layers of one that mud exists to realize dehydration.Mud mud granule is electronegative, and hydrone positively charged, under electric field force effect, electronegative mud granule moves toward positive plate, and positively charged hydrone moves toward minus plate.As a kind of solid-liquid separation technique novel, green, efficient, electroosmotic dewatering technology owing to having good dewatering, the advantage such as motility is high, pollution-free, controllability is strong, receive significant attention in recent years, increasing research worker is applied in the middle of sludge dewatering, to reaching mud is carried out the purpose of deep dehydration.
With existing deeply dehydrating sludge technology (heat drying, chemical conditioning+high-pressure compressing method etc.) compare, the advantage that electroosmotic dewatering technology has a series of uniqueness, it is embodied in: good dehydrating effect, in electroosmotic dewatering process, under electrochemical reaction effect, mud cell is subject to electricity irritation, electrolysis water directional strength moves generation Brownian movement, intracellular temperature raises, pressure increases, make membranolysis, in part film, water flows out, electroosmotic dewatering can remove the portion of water that traditional mechanical dehydration can not remove, through electroosmotic dewatering, the moisture content of mud can be reduced to less than 60%；There is certain power savings advantages compared with heat drying, reduce sludge deep and process the expense of mummification；Only to sludge reduction dehydration, do not change the character of mud, composition, do not increase new material, on any one follow-up sludge treating method without impact；Processing procedure cleans, non-secondary pollution.
But, electroosmotic dewatering technology, as an emerging sludge dewatering technology, currently mainly there is also problems with: the final moisture content of (1) dehydrated sludge still has 50%-60%, is difficult to breakthrough 50%, it is difficult to reach the technique effect of the saturating high mass dryness fraction dehydration of sludge electroosmotic；(2) in electro-osmosis process, near anode, the moisture content of mud quickly reduces, and crack occurs in the generation of electrochemical reaction gas and sludge cake, contact area between sludge cake and battery lead plate reduces, causing that mud resistance increases, electric current declines, and dehydrating effect is deteriorated；(3), in dehydration, electric field generation electric current has electric energy and converts heat energy to, makes mud temperature raise, there are in fact energy consumption problem bigger than normal；(4) mud cake porous media in a thickness direction is uneven, and anode layer moisture percentage in sewage sludge is relatively low, and hydrone accumulates in cathode layer and causes that near minus plate, moisture percentage in sewage sludge is higher.
Current also have employing alternating electric field to reduce the sludge drying impact on dehydrating effect, solves above-mentioned technical problem with part.Alternating electric field is exactly after electro-osmosis certain time, electrode reversal connection, and inverse current flows through material bed, it is possible to decrease the resistance in material bed and the electrochemical reaction alleviating electrode, promotes moisture backflow to solve current anode layer sludge drying problem simultaneously.By Glycine max (L.) Merr. experiment is found, adopting electrode reversal connection than continuous operation, electro-osmosis flow can improve more than 40%.Carrying out exchange experiment with white clay, current ratio direct current final dewatering amount increases, but when frequency is higher, dewatering efficiency reduces on the contrary, adopts alternating electric field energy consumption higher, and the more difficult control of frequency.Visible, adopt alternating electric field cannot fundamentally solve the technical problem that above-mentioned electroosmotic dewatering technology exists.
Summary of the invention
In view of this, the present invention is directed to the quick mummification of anode layer mud of above-mentioned prior art existence and cause the problem that costs and poor dehydration results, energy consumption are high, anode layer cathode layer moisture content is unequal, it is provided that the sewage sludge dewatering that a kind of anode layer mud resistance increases slowly, dehydrating effect is good, the uniform electro-osmosis of mud thickness direction porous media couples with mechanism filter-pressing.
The technical solution of the present invention is to provide the sewage sludge dewatering that the electro-osmosis of a kind of following steps couples with mechanism filter-pressing, comprises the following steps:
The preliminary mechanical filter-press dehydration stage: sewage sludge enters in primary filter-press dehydration device, realizes preliminary mechanical filter-press dehydration, moisture percentage in sewage sludge is down to 75% ~ 80% in primary filter-press dehydration device；
Electro-osmosis and mechanism filter-pressing coupling water smoking: through stepAfter process, the positive plate of electro-osmosis and minus plate are arranged in coupling dehydration tube body, adopt DC source that positive plate and the minus plate of electro-osmosis are powered, described positive plate and minus plate constitute filter pressing chamber as the pressing mechanism of mechanism filter-pressing with coupling dehydration cylinder, while realizing electroosmotic dewatering, keep the mechanism filter-pressing between antianode plate and minus plate, so that two-plate contacts well with mud；
The high-pressure machinery filter-press dehydration stage: through stepAfter process, the moisture percentage in sewage sludge of positive plate is low, sludge drying, now disconnect DC source, stop electroosmotic dewatering, and strengthen the pressure between positive plate and minus plate, realizing high-pressure machinery filter-press dehydration, sludge water content is toward minus plate and positive plate two-way flow so that between two-plate, moisture content is uniform.
Adopt above step, the present invention is compared with prior art, have the advantage that by adopting mechanism filter-pressing to combine with electro-osmosis, form three water smokings, and at the pressure of different water smokings control mechanism filter-pressing, in the coupling water smoking, increase battery lead plate and mud closeness of contact, making resistance reduce, electric current increases, and dehydrating effect is better；When mechanism filter-pressing dehydration acts on electroosmotic dewatering simultaneously, as long as adopting low pressure guarantee pole plate to have with mud to be necessarily in close contact, now moisture is all moved from positive plate toward minus plate, carrying out along with dehydration, anode layer mud becomes dry and causes that resistance increases electric current simultaneously and reduces, the driving force making electroosmotic dewatering reduces, if proceeded down, resistance will become very large and make electric field driven power almost without causing that dehydration stops, now, portion of water must be made to be back to anode layer, now stop power supply, regulate device by high-low pressure and be switched to high-pressure machinery high pressure mode, make moisture forced refluence to anode layer, reduce mud resistance and increase electric current, mud thickness direction porous media is uniform, improve next round electro-osmosis driving force.
As preferably, described mechanism filter-pressing is provided power by hydraulic means, regulates, by high-low pressure, the hydraulic pressure that system fading margin hydraulic means provides, to realize the switching of high-low pressure, in stepMiddle employing low pressure provides power, in stepMiddle employing high pressure provides power.The system that regulated by high-low pressure is used for the adjustment of hydraulic power, it is simple to the switching of power so that it is suitable in the corresponding water smoking.
As preferably, described sewage sludge dewatering adopts alternately pressure swing type dehydration mode, completes stepAfter, between two-plate, moisture content uniformly becomes uniform, now again sequentially enters stepWith, circulation is until reaching expection moisture percentage in sewage sludge requirement and so forth.Owing to have employed alternately pressure swing type dehydration mode, stepMaking positive plate mud by moisturizing again, the dewatered sludge started become wet mud, can be restored to again electro-osmosis and mechanism filter-pressing coupling water smoking, now high-low pressure regulates system and is switched to low pressure, dehydration common with electro-osmosis.
As preferably, in stepIn, minus plate place is provided with sucker, by promoting sucker deformation so that sucker produces the restoring force of suck-back, with from minus plate adsorption moisture.Characteristic according to electro-osmosis, minus plate place has gathered more moisture, owing to electric field force drives minus plate moisture more weak, in order to accelerate the moisture velocity of discharge and output near minus plate, certain vacuum is produced at minus plate place, minus plate place sludge water content is applied certain suction, forms electric field force and vacuum filters double dehydration effect.
As preferably, described sucker is the hemispherical dome structure that elastomeric material is made, and its outer ring seals and is fixed on the outer edge of minus plate, and the middle and lower part of sucker is connected to thrust mechanism, sucker lower end is connected to drain pipe and electromagnetic switch, and electromagnetic switch controls the opening and closing of drain pipe.Promoting sucker deformation by thrust mechanism, sucker produces the restoring force of vacuum, sucker and minus plate and forms a chamber that can produce vacuum, the moisture sucking-off that minus plate is gathered by its restoring force, and opens electromagnetic switch, and moisture is discharged from drain pipe.
Accompanying drawing explanation
Fig. 1 is the FB(flow block) of the sewage sludge dewatering that electro-osmosis of the present invention couples with mechanism filter-pressing.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
The present invention contains any replacement, amendment, equivalent method and scheme made in the spirit and scope of the present invention.Understand thoroughly to make the public that the present invention to be had, present invention below preferred embodiment describes in detail concrete details, and does not have the description of these details can also understand the present invention completely for a person skilled in the art.Additionally, needs in order to illustrate in the accompanying drawing of the present invention, accurately it be drawn to scale completely, be explained at this.
As it is shown in figure 1, the sewage sludge dewatering that a kind of electro-osmosis of the present invention couples with mechanism filter-pressing, comprise the following steps:
The preliminary mechanical filter-press dehydration stage: sewage sludge enters in primary filter-press dehydration device, realizes preliminary mechanical filter-press dehydration, moisture percentage in sewage sludge is down to 75% ~ 80% in primary filter-press dehydration device；In this water smoking, it is possible to realize sewage sludge minimizing largely, in this stage, adopting the mechanism filter-pressing of mesolow, its pressure is generally 0.1-0.5MPa；
Electro-osmosis and mechanism filter-pressing coupling water smoking: through stepAfter process, the positive plate of electro-osmosis and minus plate are arranged in coupling dehydration tube body, adopt DC source that positive plate and the minus plate of electro-osmosis are powered, described positive plate and minus plate constitute filter pressing chamber as the pressing mechanism of mechanism filter-pressing with coupling dehydration cylinder, while realizing electroosmotic dewatering, keep the mechanism filter-pressing between antianode plate and minus plate, so that two-plate contacts well with mud.DC source both positive and negative polarity electrically connects with positive plate and minus plate respectively, determines supply voltage according to mud handling capacity size (cake thickness), and arranging voltage gradient is 10-30V/cm.After this step process, moisture percentage in sewage sludge can reach 50%-60%
Being enclosed with filter cloth (its material is not limited to tradition cloth, and all materials being capable of filtering all are regarded as filter cloth) on positive plate and minus plate, the filter cloth of parcel minus plate is that stainless steel material is made, and is conducive to improving electroosmotic dewatering effect.Moisture leaches from the filter cloth of positive plate and minus plate.
In stepIn, the pressure of its mechanism filter-pressing is variable range, and along with the carrying out of filter pressing, the sludge quantity between positive plate and minus plate reduces, it is necessary to pressurizeing further, the pressure in this stage is 0.05-0.5MPa.
The high-pressure machinery filter-press dehydration stage: through stepAfter process, the moisture percentage in sewage sludge of positive plate is low, sludge drying, now disconnect DC source, stop electroosmotic dewatering, and strengthen the pressure between positive plate and minus plate, realizing high-pressure machinery filter-press dehydration, sludge water content is toward minus plate and positive plate two-way flow so that between two-plate, moisture content is uniform.This water smoking is high press-dehydrating, it is provided that be 3-5MPa to the pressure of mud.
In the middle of above-mentioned steps, it is possible to realize by corresponding device, and the description according to above step, those of ordinary skill in the art know the embodiment of the related device basic structure that disclosure satisfy that the present invention uses.
Described mechanism filter-pressing is provided power by hydraulic means, regulates, by high-low pressure, the hydraulic pressure that system fading margin hydraulic means provides, to realize the switching of high-low pressure, in stepMiddle employing low pressure provides power, in stepMiddle employing high pressure provides power.The system that regulated by high-low pressure is used for the adjustment of hydraulic power, it is simple to the switching of power so that it is suitable in the corresponding water smoking.High-low pressure is regulated system and is realized by parts such as motor, hydraulic pump, hydraulic valve and pipelines, and its way of realization has multiple, does not just illustrate at this.
Described sewage sludge dewatering adopts alternately pressure swing type dehydration mode, completes stepAfter, between two-plate, moisture content uniformly becomes uniform, now again sequentially enters stepWith, circulation is until reaching expection moisture percentage in sewage sludge requirement and so forth.Moisture percentage in sewage sludge reaches less than 50%.Alternately pressure swing type dehydration mode refers to stepWithCoupling dehydration and high pressure filter-press dehydration alternately, the two required pressure is different, therefore is called transformation.Above procedure can substantially be illustrated in FIG, although in step in Fig. 1Rear increase by step, but this step actually step increased, therefore, both it is believed that be to revert to step, it is possible to how refer to a step and stepIdentical step, its essence is consistent.For owing to have employed alternately pressure swing type dehydration mode, stepMaking positive plate mud by moisturizing again, the dewatered sludge started become wet mud, can be restored to again electro-osmosis and mechanism filter-pressing coupling water smoking, now high-low pressure regulates system and is switched to low pressure, dehydration common with electro-osmosis.
In stepIn, minus plate place is provided with sucker, by promoting sucker deformation so that sucker produces the restoring force of suck-back, with from minus plate adsorption moisture.Its principle is similar to " water pulls out son ".Characteristic according to electro-osmosis, minus plate place has gathered more moisture, owing to electric field force drives minus plate moisture more weak, in order to accelerate the moisture velocity of discharge and output near minus plate, certain vacuum is produced at minus plate place, minus plate place sludge water content is applied certain suction, forms electric field force and vacuum filters double dehydration effect.
Described sucker is the hemispherical dome structure that elastomeric material is made, and its outer ring seals and is fixed on the outer edge of minus plate, and the middle and lower part of sucker is connected to thrust mechanism, and sucker lower end is connected to drain pipe and electromagnetic switch, and electromagnetic switch controls the opening and closing of drain pipe.Promoting sucker deformation by thrust mechanism, sucker produces the restoring force of vacuum, sucker and minus plate and forms a chamber that can produce vacuum, the moisture sucking-off that minus plate is gathered by its restoring force, and opens electromagnetic switch, and moisture is discharged from drain pipe.
It is described as far as preferred embodiment of the present invention above, but is not to be construed as limitations on claims.The present invention is not only limited to above example, and its concrete structure allows to change.In a word, all various changes made in the protection domain of independent claims of the present invention are all in protection scope of the present invention.
Claims (5)
1. the sewage sludge dewatering that an electro-osmosis couples with mechanism filter-pressing, it is characterised in that: comprise the following steps:
The preliminary mechanical filter-press dehydration stage: sewage sludge enters in primary filter-press dehydration device, realizes preliminary mechanical filter-press dehydration, moisture percentage in sewage sludge is down to 75% ~ 80% in primary filter-press dehydration device；
Electro-osmosis and mechanism filter-pressing coupling water smoking: through stepAfter process, the positive plate of electro-osmosis and minus plate are arranged in coupling dehydration tube body, adopt DC source that positive plate and the minus plate of electro-osmosis are powered, described positive plate and minus plate constitute filter pressing chamber as the pressing mechanism of mechanism filter-pressing with coupling dehydration cylinder, while realizing electroosmotic dewatering, keep the mechanism filter-pressing between antianode plate and minus plate, so that two-plate contacts well with mud；
The high-pressure machinery filter-press dehydration stage: through stepAfter process, the moisture percentage in sewage sludge of positive plate is low, sludge drying, now disconnect DC source, stop electroosmotic dewatering, and strengthen the pressure between positive plate and minus plate, realizing high-pressure machinery filter-press dehydration, sludge water content is toward minus plate and positive plate two-way flow so that between two-plate, moisture content is uniform.
2. the sewage sludge dewatering that electro-osmosis according to claim 1 couples with mechanism filter-pressing, it is characterized in that: described mechanism filter-pressing is provided power by hydraulic means, the hydraulic pressure that system fading margin hydraulic means provides is regulated, to realize the switching of high-low pressure, in step by high-low pressureMiddle employing low pressure provides power, in stepMiddle employing high pressure provides power.
3. the sewage sludge dewatering that electro-osmosis according to claim 1 and 2 couples with mechanism filter-pressing, it is characterised in that: described sewage sludge dewatering adopts alternately pressure swing type dehydration mode, completes stepAfter, between two-plate, moisture content uniformly becomes uniform, now again sequentially enters stepWith, circulation is until reaching expection moisture percentage in sewage sludge requirement and so forth.
4. the sewage sludge dewatering that electro-osmosis according to claim 1 couples with mechanism filter-pressing, it is characterised in that: in stepIn, minus plate place is provided with sucker, by promoting sucker deformation so that sucker produces the restoring force of suck-back, with from minus plate adsorption moisture.
5. the sewage sludge dewatering that electro-osmosis according to claim 1 couples with mechanism filter-pressing, it is characterized in that: described sucker is the hemispherical dome structure that elastomeric material is made, its outer ring seals and is fixed on the outer edge of minus plate, the middle and lower part of sucker is connected to thrust mechanism, sucker lower end is connected to drain pipe and electromagnetic switch, and electromagnetic switch controls the opening and closing of drain pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610315491.8A CN105800891B (en) | 2016-05-15 | 2016-05-15 | The sewage sludge dewatering that electro-osmosis is coupled with mechanism filter-pressing |
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| CN201610315491.8A CN105800891B (en) | 2016-05-15 | 2016-05-15 | The sewage sludge dewatering that electro-osmosis is coupled with mechanism filter-pressing |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109485235A (en) * | 2018-12-29 | 2019-03-19 | 启迪桑德环境资源股份有限公司 | A kind of saturating Bidirectional water outlet of sludge electroosmotic and double it is electrically coupled high level cadre's dewatering system and method |
| CN110240388A (en) * | 2019-06-06 | 2019-09-17 | 河南工程学院 | Exchange electrode electro-osmosis sludge dewatering system and method based on voltage hierarchical detection |
| CN111138050A (en) * | 2020-01-08 | 2020-05-12 | 肇庆学院 | Electroosmosis sludge dewatering board |
| CN112851058A (en) * | 2020-12-24 | 2021-05-28 | 大地绿源环保科技(北京)有限公司 | Alternating-current voltage auxiliary belt type filter pressing equipment and sludge high-dryness dewatering method |
| CN113860702A (en) * | 2021-05-12 | 2021-12-31 | 中国计量大学 | Multi-field coupling automatic dewatering method for sewage sludge |
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| JPH054100A (en) * | 1991-06-26 | 1993-01-14 | Shinko Pantec Co Ltd | Electroosmosis dehydrating method for sludge |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109485235A (en) * | 2018-12-29 | 2019-03-19 | 启迪桑德环境资源股份有限公司 | A kind of saturating Bidirectional water outlet of sludge electroosmotic and double it is electrically coupled high level cadre's dewatering system and method |
| CN110240388A (en) * | 2019-06-06 | 2019-09-17 | 河南工程学院 | Exchange electrode electro-osmosis sludge dewatering system and method based on voltage hierarchical detection |
| CN110240388B (en) * | 2019-06-06 | 2023-09-12 | 河南工程学院 | Exchange electrode electroosmosis sludge dewatering system and method based on voltage grading detection |
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| CN112851058A (en) * | 2020-12-24 | 2021-05-28 | 大地绿源环保科技(北京)有限公司 | Alternating-current voltage auxiliary belt type filter pressing equipment and sludge high-dryness dewatering method |
| CN113860702A (en) * | 2021-05-12 | 2021-12-31 | 中国计量大学 | Multi-field coupling automatic dewatering method for sewage sludge |
| CN113860702B (en) * | 2021-05-12 | 2023-09-19 | 中国计量大学 | Multi-field coupling automatic sewage sludge dehydration method |
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