CN202543020U - Annular electric field and pressure synergized sludge dehydration and granulation device - Google Patents

Annular electric field and pressure synergized sludge dehydration and granulation device Download PDF

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Publication number
CN202543020U
CN202543020U CN2012202005858U CN201220200585U CN202543020U CN 202543020 U CN202543020 U CN 202543020U CN 2012202005858 U CN2012202005858 U CN 2012202005858U CN 201220200585 U CN201220200585 U CN 201220200585U CN 202543020 U CN202543020 U CN 202543020U
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electric field
sludge
mud
granulation
dehydration
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Expired - Fee Related
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CN2012202005858U
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Chinese (zh)
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马德刚
赵娴
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Tianjin University
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Tianjin University
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Abstract

The utility model relates to an annular electric field and pressure synergized sludge dehydration and granulation device. The device is formed by a dehydration cavity body consisting of a sludge inlet, sleeve electrodes, a diversion baffle and a granulation baffle which are arranged concentrically; the sleeve electrodes are two cylinders which are concentrically arranged; the external cylinder is an anode and is connected with the anode of a direct current power supply; the internal cylinder is in a mesh shape, is connected with the cathode of the power supply and is taken as the cathode of an electric field; the two electrodes are arranged into an annular electric field in an insulation way; a cone baffle is arranged at the sludge feeding part of the internal cylinder, wherein the diameter of the cone baffle is the same as the diameter of the internal cylinder, and the cone apex angle of the cone baffle is 60-120 degrees; the granulation baffle is arranged at the sludge outlet; and a sludge discharge port is arranged at the granulation baffle, and the aperture rate is between 30 percent and 80 percent. The mechanical pressure directly acts on the sludge when the sludge is fed, wherein the mechanical pressure is 1000 Pa to 300000 Pa, and the voltage of the dehydration electric field is 10-200 V; the method can be used for overcoming the problem that the conventional mechanical dehydration way is low in efficiency; with the adoption of the device provided by the utility model, the excessive moisture of the sludge can be fast and effectively dehydrated and the granulation function can be realized at the same time, thus, the reduction of the sludge can be favored.

Description

The synergistic sludge dewatering prilling granulator of ring-type electric field and pressure
Technical field
The utility model belongs to the sludge dewatering prilling granulator, the synergistic sludge dewatering prilling granulator of particularly a kind of ring-type electric field and pressure.
Background technology
Mud comprises and contains municipal sewage sludge, waterworks sludge, drainage channel mud, water body dredging silt etc. that it is measured much larger than the domestic waste amount, and municipal sludge contains higher pollutant load.Wherein the organic content of municipal effluent plant excess sludge is 10 times of municipal effluent, and the pathogenic microorganism content in the Sewage Plant dewatered sludge cake is than the high several magnitude of domestic waste.In addition, also possibly contain pollution substances such as heavy metal, hypertoxic organism in the various mud.Therefore, the municipal sludge harm that possibly cause environment is serious.
Mud becomes one type and liquid and all distinguishing waste of solid-state castoff because of the slurry attitude characteristic of its liquid-solid phase mixture.It not only has the characteristic of slurry attitude thing when producing; And its liquid, solid admixture have certain stability; Usually only when applying great applied external force (physics, chemistry), could separate by solid, liquid, therefore, its management all has the characteristic that is different from other wastes with the treatment technology system.
In the logistics characteristic of mud; The water ratio height is notable attribute; Not only can cause problems such as follow-up logistics difficulty of transportation, treatment facility capacity are big, less economical because of sludge volume is huge, and the mud of the overwhelming majority is final handles and utilize process also incompatible with the logistics of crossing high-moisture percentage.Therefore, the dehydration of mud occupies important status in the sludge treatment.
The existence form that removes with its internal moisture of moisture has much relations in the mud.Conventional mechanical dehydration can only be removed free water usually, and residual moisture is looked at as " border moisture ", and border moisture is the theoretical limit of mechanical dehydration.Moisture percentage in sewage sludge behind mechanical dehydration is still up to 75~85%.So high moisturely produced very big difficulty and high economic cost for the mud subsequent disposal, like burning, landfill etc., drying sludge then need consume very big heat energy, and its cost is higher.Therefore, field of sludge treatment is starved of the new mud dewatering method of exploitation, and is economical, deviate from excessive moisture apace, reduces sludge moisture content.
Except that drying, electroosmotic dewatering (claiming electric field dehydration or electro-dewatering again) is a kind of technological method that can realize deep dehydration.This technology is based on the electroosmotic flow that solid particles surface produces under the electric field and the solid-liquid sepn process of carrying out, and promptly utilizes applying direct current electric field to strengthen the water separation capability of material.Owing to the inside and outside surface that dehydration is directly occurred in mud granule, deviate from free water, gap moisture and part surface combined moisture simultaneously, therefore can realize deep dehydration.Electro-dewatering technology early has proposition, but is confined to laboratory study more, industrial application equipment seldom, the difficulty of its application mainly be the electric field form and with the combination of mechanical pressure, mostly the electric field of using at present is twin-roll electric field and the board-like parallel electric field of on-fixed.In application, there is short partially and dewatering efficiency problem of lower of electro-dewatering time in the twin-roll electric field, and the board-like parallel electric field of on-fixed then exists electric field poor stability and the unequal problem of pressure distribution.
In the electro-dewatering method of current application, also exist following problem to be difficult to overcome: (1) mechanical pressure all is to be applied to indirectly on the mud through cylinder or on-fixed plate electrode, problem such as have that pressure distribution is uneven, dry spot and liquid phase are discontinuous; (2) convenient and prevent the electric field short circuit for charging, thick partially filter cloth usually commonly used is to moisture penetration with to remove influence bigger; (3) do not possess the granulation function, the mud behind the electro-dewatering is irregular sheet, is difficult to realize for other particle shapes of subsequent disposal institute special requirement.
In addition; Fixing tabular parallel electric field dehydration prilling process has good effect to addressing the above problem; But it is bigger to exist fixing tabular electric field to advance the mud resistance in using, and be connected difficulty with existing mud pressurization preparation, and machinery pressurization back electric field electrode stress deformation is serious.
In view of the above problems, the operation stability of electro-dewatering equipment and reliability decrease have greatly restricted this The Application of Technology.Therefore, need innovate original electro-dewatering technology, this method can have breakthrough, and obtains widespread use.
Summary of the invention
The utility model provides the granulating integrated device of sludge dewatering under a kind of ring-type electric field and the pressure synergy, concrete technical scheme is following:
The synergistic sludge dewatering prilling granulator of a kind of ring-type electric field and pressure is formed the dehydration cavity jointly by mud inlet, sleeve electrode, distributing damper and the granulation baffle plate of arranged concentric; The sleeve electrode is two cylinder arranged concentric, and outside cylindrical is anode and is connected with dc power anode, and inside cylindrical is netted and is connected with power cathode that as the electric field negative electrode, empire cloth is set to the ring-type electric field between two electrodes; The anodic-cathodic spacing be the thickness of dewatered sludge mud layer between 2mm~20mm, what the cone baffle plate was placed in inside cylindrical advances one section in mud, its diameter is identical with inside cylindrical, its circular cone drift angle is 60 °~120 °; The granulation baffle plate is arranged on the sludge outlet place; The granulation baffle plate is circular, on perforate is arranged as mud discharging mouth, its percentage of open area is 30%-80%.
The mesh cathode inboard is provided with diversion trench or moisture tripping device, deviates from moisture and leaves through diversion trench or moisture tripping device, and the moisture tripping device is an absorbent material layer, or is provided with Wiper blade, or adopts the swabbing brush.
Mechanical pressure acts directly on when advancing mud on the mud, and pressure is between 1000Pa~300000Pa, and the voltage of dewatering electric field is 10~200V, but pulse power supply, and the import moisture percentage in sewage sludge is 50%~90%.
Specify as follows:
Mud inlet, sleeve electrode, distributing damper and granulation baffle plate by arranged concentric are formed the dehydration cavity jointly.The sleeve electrode is two cylinder arranged concentric, and outside cylindrical is anode and is connected with dc power anode, and inside cylindrical is netted and is connected with power cathode that as the electric field negative electrode, empire cloth is set to the ring-type electric field between two electrodes.Mesh cathode has pervious function, and filter cloth can be set, if the turbidity that removes moisture had relatively high expectations thin filter cloth can be set.Be provided with at the entrance of dewatering electric field cavity and conical baffled mud shunted, mud gets into electric field through pressurization and accomplishes dehydration, behind the granulation baffle plate extruder grain that the electric field outlet is provided with, discharges then.
Mechanical pressure acts directly on when advancing mud on the mud, guarantees that the dehydration cavity internal pressure is evenly distributed, and the ring-type electric field has been alleviated the stress deformation and the too fast problem of current damping of electrode, and filter cloth is very thin or the cancellation filter cloth, and then reduces the moisture movement resistance.Under the acting in conjunction of electric field and mechanical pressure, can remove the moisture in the mud more fast and efficiently; And realize the granulation function synchronously; Further reduce the cost of sludge volume and subsequent disposal, and be that follow-up mummification, burning, compost etc. provide particles of different sizes attitude material.
In dehydration, mud pressurizes after conical baffled branch flows into dewatering electric field, and the electric field both sides are respectively cylindric electrical conductor as anode and cathode.Anode is a metallic cylinder, and negative electrode is metal net shaped cylinder electrode, and both become sleeve-like at arranged concentric, and is connected with the positive and negative electrode of direct supply respectively.Between negative electrode and anode, will form electric field, and be full of mud medium to be drained off in the electric field and closely contact with electrode.Because the particle in the active sludge has negative electricity, the ion in water can form electric two double-layers on the surface, comprise non diffusible ion layer and diffusion ion layer.Under electric field action, relatively sliding will take place in electric two double-layers of particle surface, and electronegative particle or ion (mud granule) anode moves, and the particle or the ion of positively charged move to negative electrode.Moving of mud sometimes can be restricted in, and the kapillary residual moisture in the mud then is moved to negative electrode under positive ion drives.Accumulative moisture has just been realized dehydration after breaking away from negative electrode and mud near the negative electrode.
The utility model is in dehydration, and mud gets into from the pressurization of electric field one end, and the conical baffled shunting to mud of ingress can effectively reduce into mud resistance.Mud granulation baffle plate from the other end after the electric field dehydration is discharged, and annotates the common mechanical pressure size that has determined material dewatering of stopping of mud pressure and granulation baffle plate.Reduce the gap between mud granule through suffered squeeze, make that holding moisture reduces, separate out moisture and see through sludge cake mesh cathode side disengaging mud, reach the dehydration purpose.The circular cone drift angle of cone baffle plate is 60 °-120 °.The granulation baffle plate is circular, on perforate is arranged as mud discharging mouth, its mud discharging mouth size design is decided by that the discharging particle size requires and the material pressure needs, its percentage of open area is 30%-80%, it is oval or square that mud discharging mouth is shaped as circle.
The electrode that adopts in the utility model requires to have conducting function, and anode is cylindric, and negative electrode is netted.If negative electrode does not possess filtering function, promptly can not moisture be separated with mud granule, then need between negative electrode and mud, filtering material be set.Can adopt filter cloth double as electrode with conducting function, as wire cloth is implanted in the filter cloth, also can be with the electrode that has hole and filter cloth realization conduction compressed together and filtering function.
Under the acting in conjunction of electric field and mechanical pressure; The motion of mud internal moisture also accumulates in cathode side and the filtration medium surface; Gravity by means of moisture can break away from filtration medium and realize centrifugation; The inboard diversion trench of negative electrode helps moisture to separate, and perhaps adopts special moisture tripping device to separate.The moisture tripping device has following several kinds of forms: separate moisture build op through scraper plate, perhaps adopt catchment branchs and realize centrifugation of brush segregation, perhaps adopt water-absorbing material to inhale and go to move and next moisture.
The used electric field of the utility model is provided by direct supply or pulsed power supplies, and its supply mode is continuous mode or pulse mode.Pulse power supply mode in the variety of way can be made power supply with the simplest commercial power, and pulse waveform has no special requirements, and dutycycle (power-on time) can be regulated according to particular case.Certainly, also can realize pulse electrifying with the mode of direct current interval break-make, promptly in section energising sometime, the mode of section outage sometime.
The anodic-cathodic spacing is that the thickness of dewatered sludge mud cake is between 2mm~20mm, according to decisions such as dehydration needs time, sludge characteristics, product water content requirement in the utility model.Hmc increases dewatering time than senior general, as shorten dewatering time then the product water ratio will increase.For guaranteeing mud moving smoothly in electric field, the import moisture percentage in sewage sludge is controlled between 50%~90%.The voltage control of electric field is between 10~200V, and higher voltage can increase the motion-promotion force of mud internal moisture, shortens dewatering time, reduces the product water ratio, but has also increased the consumption of electric field electric energy simultaneously, and can aggravate the formation of anode dry spot.Sludge dewatering needs electric field and pressure synergy to accomplish in the utility model; The mechanical pressure difference that is applied on the mud cake is controlled between 1000Pa~300000Pa; As far as certain thickness mud cake and certain voltage of electric field; There is an optimum value in the mechanical pressure difference, less than the time and the effect that perhaps all can influence sludge dewatering greater than this optimum value.
Utilize this method can overcome the low difficulty of traditional mechanical dewatering type dehydration rate, deviate from the mud excessive moisture fast and efficiently and realize the granulation function simultaneously.This method is compared with board-like electro-dewatering, has that resistance is little, current damping speed waits advantage slowly, can reduce mud resistance of motion 10%-30%, and moisture percentage in sewage sludge is reduced to 40%-70%, and volume reduces 17%-70%.
Description of drawings
Fig. 1: embodiment 1 synoptic diagram;
Fig. 2: embodiment 2 synoptic diagram;
Fig. 3: embodiment 3 synoptic diagram;
Fig. 4: embodiment 4 synoptic diagram;
1. anode 2. mud 3. negative electrodes 4. mud inlets 5. conical baffled 6. granulation baffle plates, 7. direct supplys, 8. filter clothes, 9. scraper plates, 10. brushes, 11. water-absorbing materials
Embodiment
Embodiment 1:
As shown in Figure 1, metallic cylinder anode 1 becomes sleeve with netted cylinder negative electrode 3 arranged concentric, spacing 5mm, and be connected with direct supply 7 positive and negative electrode respectively.Be covered with filter cloth 8 between mesh cathode 3 and the mud 2.Water ratio is that 85% mud to be drained off 2 injects from mud inlet 4 behind pressurization 100000Pa; After conical baffled 5 shuntings of 60 ° of circular cone drift angles, get into the ring-type electric field; Under electric field action, move to outlet in the dehydration, the moisture in the mud is scraped from the back by scraper plate 9 with negative electrode 3 backs through filter cloth 8 and is accomplished dehydration.Mud after the dehydration is discharged after granulation baffle plate 6 is squeezed into particle, and mud discharging mouth is shaped as circle, and percentage of open area is 50%.DC power supply adopts continuous voltage regulation way, and service voltage is 50V ± 10V.Mud water ratio after dewatering can be reduced to 70%, and volume reduces 50%.Compare with tabular electro-dewatering, the mud resistance of motion reduces 20%.
Embodiment 2:
As shown in Figure 2, metallic cylinder anode 1 becomes sleeve with netted cylinder negative electrode 3 arranged concentric, spacing 2mm, and be connected with direct supply 7 positive and negative electrode respectively.Mesh cathode 3 self has filtering function.Water ratio is that 90% mud to be drained off 2 injects from mud inlet 4 behind pressurization 1000Pa; After conical baffled 5 shuntings of 60 ° of circular cone drift angles, get into the ring-type electric field; Under electric field action, move to outlet in the dehydration, the moisture in the mud is accomplished dehydration by brush 10 brushes from the back through negative electrode 3 backs.Mud after the dehydration is discharged after granulation baffle plate 6 is squeezed into particle, and mud discharging mouth is shaped as ellipse, and percentage of open area is 80%.DC power supply adopts continuous voltage regulation way, and service voltage is 10V.Mud water ratio after dewatering can be reduced to 67%, and volume reduces 70%.Compare with tabular electro-dewatering, the mud resistance of motion reduces 30%.
Embodiment 3:
As shown in Figure 3, metallic cylinder anode 1 becomes sleeve with netted cylinder negative electrode 3 arranged concentric, spacing 20mm, and be connected with direct supply 7 positive and negative electrode respectively.Mesh cathode 3 self has filtering function.Water ratio is that 50% mud to be drained off 2 injects from mud inlet 4 behind pressurization 300000Pa; After conical baffled 5 shuntings of 120 ° of circular cone drift angles, get into the ring-type electric field; Under electric field action, move to outlet in the dehydration, the moisture in the mud is separated the back through negative electrode 3 backs by water-absorbing material 11 and accomplishes dehydration.Mud after the dehydration is discharged after granulation baffle plate 6 is squeezed into particle, and mud discharging mouth is shaped as square, and percentage of open area is 30%.Direct supply adopts the pulse power supply mode, and service voltage is 150~200V, and each power-up period power-on time accounts for 80%.Mud water ratio after dewatering can be reduced to 40%, and volume reduces 17%.Compare with tabular electro-dewatering, the mud resistance of motion reduces 10%.
Embodiment 4:
As shown in Figure 4, metallic cylinder anode 1 becomes sleeve with netted cylinder negative electrode 3 arranged concentric, spacing 10mm, and be connected with direct supply 7 positive and negative electrode respectively.Mesh cathode 3 self has filtering function, and the inboard has diversion trench and strengthens flowing of separation moisture.Water ratio is that 80% mud to be drained off 2 injects from mud inlet 4 behind pressurization 100000Pa; After conical baffled 5 shuntings of 90 ° of circular cone drift angles, get into the ring-type electric field; Under electric field action, move to outlet in the dehydration, the moisture in the mud compiles outflow through behind the negative electrode 3 through diversion trench.Mud after the dehydration is discharged after granulation baffle plate 6 is squeezed into particle, and mud discharging mouth is shaped as circle, and percentage of open area is 50%.Direct supply adopts continuous voltage regulation way, and service voltage is 80~100V.Mud water ratio after dewatering can be reduced to 60%, and volume reduces 50%.Compare with tabular electro-dewatering, the mud resistance of motion reduces 15%.

Claims (2)

1. ring-type electric field and the synergistic sludge dewatering prilling granulator of pressure is characterized in that forming the dehydration cavity jointly by mud inlet, sleeve electrode, distributing damper and the granulation baffle plate of arranged concentric; The sleeve electrode is two cylinder arranged concentric, and outside cylindrical is anode and is connected with dc power anode, and inside cylindrical is netted and is connected with power cathode that as the electric field negative electrode, empire cloth is set to the ring-type electric field between two electrodes; The anodic-cathodic spacing be the thickness of dewatered sludge mud layer between 2mm~20mm, what the cone baffle plate was placed in inside cylindrical advances one section in mud, its diameter is identical with inside cylindrical, its circular cone drift angle is 60 °~120 °; The granulation baffle plate is arranged on the sludge outlet place; The granulation baffle plate is circular, on perforate is arranged as mud discharging mouth, its percentage of open area is 30%~80%.
2. the synergistic sludge dewatering prilling granulator of ring-type electric field as claimed in claim 1 and pressure; It is characterized in that; The mesh cathode inboard is provided with diversion trench or moisture tripping device, deviates from moisture and leaves through diversion trench or moisture tripping device, and the moisture tripping device is an absorbent material layer; Or be provided with Wiper blade, or adopt the swabbing brush.
CN2012202005858U 2012-05-07 2012-05-07 Annular electric field and pressure synergized sludge dehydration and granulation device Expired - Fee Related CN202543020U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102674654A (en) * 2012-05-07 2012-09-19 天津大学 Sludge dewatering and granulating device and method with synergic effect of annular electric field and pressure
CN104108849A (en) * 2014-06-11 2014-10-22 北京林业大学 Sludge dehydrating method and device therefor
CN105923976A (en) * 2016-06-21 2016-09-07 陈铭鸿 Sludge dehydrating device
CN109695264A (en) * 2019-01-21 2019-04-30 大连理工大学 A kind of suction type cylindrical foundation sinks cylinder correction and bracing means and its construction method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102674654A (en) * 2012-05-07 2012-09-19 天津大学 Sludge dewatering and granulating device and method with synergic effect of annular electric field and pressure
CN104108849A (en) * 2014-06-11 2014-10-22 北京林业大学 Sludge dehydrating method and device therefor
CN104108849B (en) * 2014-06-11 2015-10-28 北京林业大学 A kind of method of sludge dewatering and equipment thereof
CN105923976A (en) * 2016-06-21 2016-09-07 陈铭鸿 Sludge dehydrating device
CN109695264A (en) * 2019-01-21 2019-04-30 大连理工大学 A kind of suction type cylindrical foundation sinks cylinder correction and bracing means and its construction method
CN109695264B (en) * 2019-01-21 2023-09-19 大连理工大学 Suction type cylindrical foundation sinking cylinder rectifying and reinforcing device and construction method thereof

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Granted publication date: 20121121

Termination date: 20150507

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