CN1948192A - Dewatering technology of mud and its device - Google Patents
Dewatering technology of mud and its device Download PDFInfo
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- CN1948192A CN1948192A CN 200610016350 CN200610016350A CN1948192A CN 1948192 A CN1948192 A CN 1948192A CN 200610016350 CN200610016350 CN 200610016350 CN 200610016350 A CN200610016350 A CN 200610016350A CN 1948192 A CN1948192 A CN 1948192A
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Abstract
The present invention relates to a sludge dehydration process and its equipment. Said equipment includes a mechanical filter pressing device, an ultrasonic quality-improving device, a pressure synergistic electroosmosis dehydration device and an adsorption dehydration material device. The cathode of the pressure synergistic electroosmosis dehydration device is placed at one side of sludge dehydration device, and its anode is placed at another side of sludge. Said ultrasonic quality-improving device is mainly composed of three portions of ultrasonic generator, ultrasonic convertor and ultrasonic contact. Besides, said invention also provides its working principle and concrete operation method and steps.
Description
Technical field
The present invention relates to a kind of dewatering technology of mud and device, belong to the sludge treatment technology of sewage disposal and solid waste process field.
Background technology
Along with The development in society and economy and quickening of urbanization process, town sewage and amount of sludge thereof increase fast.China produces wet mud per year up to 1,200 ten thousand tons, and annual growth rate is between the 10-15%.Because the sludge treatment cost accounts for about 50% of sewage work's processing cost, cost is very high, so the many sewage works of China often only handle sewage and avoided sludge treatment, based on landfill and stacking, causes the serious environmental pollution problem.Therefore, when actively carrying out sewage disposal mud being carried out scientific and reasonable treatment and disposal has been imperative.
Sewage plant sludge is a kind of uneven, complicated dispersed system, and water ratio is up to 95-99%, and volume and quantity are huge, and is easily smelly, therefore, must in time handle, and the decrement of dewatering is beneficial to subsequent processes and disposal.The existence form of moisture is divided four classes usually in the mud: free water, interstitial water, surface adsorption water, cellular water and chemically-bonded water.Free water can be removed by gravity settling; Interstitial water can be removed by strong mechanical force; And cellular water and chemically-bonded water are difficult to remove with mechanical means.In addition, contain a large amount of organic compositions in the mud, containing a large amount of resources.But, no matter be further to handle or resource utilization, all need to reduce water ratio, therefore, reducing water ratio is the necessary operation and the process of sludge treatment.Its method can be divided into heating and non-heating, and generally speaking, heating method is more much higher than the cost of non-heating method, therefore, in the high-moisture percentage section, should adopt non-type of heating.But mud is colloid property, is difficult to dehydration, even add flocculation agent, and, also be difficult to take off, and when water ratio was lower than 80%, the difficulty of filter-press dehydration increased to below 75% through mechanism filter-pressing, and decrease in efficiency, cost significantly increases.
It is one of difficult problem of sewage treatment area that sludge treatment is disposed, the domestic effective treatment craft that do not form as yet, though and developed country has formed complete technology and technical system, but cost is very high, and in non-coal-fired country, the resource utilization difficulty of mud is big, generally based on burning.In this case, many scientific workers also explore the method that reduces the mud generation, and the technology of zero release, but exist huge obstacle aspect cost, are difficult to practical application, and zero release also is difficult to accomplish technically fully.Therefore, innoxious and minimizing remains the main path of sludge treatment.Therefore, the mud of, complicated component huge at output is explored low-cost processes and is disposed, and makes the method for its minimizing, innoxious, high-level efficiency resource utilization, has become the common problem of paying close attention to of China and even whole world environment circle.Since still very high through the moisture percentage in sewage sludge of mechanism filter-pressing, the operation that is absolutely necessary of therefore further dewatering.And in dewatering, add heat drying because big energy-consuming is difficult to popularize and uses.Therefore, mud is significant for sludge treatment and resource utilization of the exploitation of the non-thermal dehydration of high-moisture percentage section (hereinafter to be referred as the physics dehydration) technology and device thereof.
Summary of the invention
The purpose of this invention is to provide a kind of sewage sludge processed technology and device, this technological process cost is low, the dewatering efficiency height, and speed is fast, can reduce the water ratio of dewatered sludge greatly, helps realizing the low-cost target of sludge treatment technique.
The present invention realized by following technological line,
Sludge dewatering treatment device of the present invention, comprise the mechanism filter-pressing device, ultrasonic wave modifying device and pressure are worked in coordination with the electroosmotic dewatering device, and adsorption dewatering material apparatus, wherein pressure is worked in coordination with dewatering unit one side that the negative electrode in the electroosmotic dewatering device places mud, and anode places the opposing party of mud; The ultrasonic wave modifying device mainly comprises ultrasonic generator, and ultrasonic transducer and ultrasonic contact three parts are formed.
The Sewage Plant thickened sludge is sent into the mechanism filter-pressing device and is carried out press filtration, when sludge moisture content reaches 80-85%, the collaborative electroosmotic dewatering device of trigger pressure carries out sludge dewatering, work in coordination with 60% when following of electroosmotic dewatering speed when the rate of water loss of pressure collaborative osmosis carrying out sludge dewatering is slack-off for its original pressure, stop the collaborative electroosmotic dewatering device of pressure, starting the ultrasonic wave modifying device carries out modified to dewatered sludge, mud after modified adopts the collaborative electroosmotic dewatering device of pressure to carry out sludge dewatering again, pressure is worked in coordination with electroosmotic dewatering DC electric field gradient scope 0.1-3V/mm, the ultrasonic frequency scope is 16-100kHz, the ultrasonic wave specific energy consumption is input as the dried solid of 10-300kW.h/T, sludge filter cake thickness range 2-50mm.
Employing comprises the mechanism filter-pressing device, and ultrasonic wave modifying device and pressure are worked in coordination with the electroosmotic dewatering device, and the adsorption dewatering material apparatus carries out the processed of sewage plant sludge, it is characterized in that comprising following process:
The Sewage Plant thickened sludge is sent into the mechanism filter-pressing device and is carried out press filtration, when sludge dewatering (corresponding sludge moisture content reach 80-85%) comparatively at need, the collaborative electroosmotic dewatering device of trigger pressure carries out sludge dewatering, when the rate of water loss of pressure collaborative osmosis carrying out sludge dewatering slack-off for its original pressure work in coordination with electroosmotic dewatering speed 60% the time, stop the collaborative electroosmotic dewatering device of pressure, start the ultrasonic wave modifying device and dewatered sludge is carried out modified, the mud after modified adopts the collaborative electroosmotic dewatering device of pressure to carry out sludge dewatering again.The target water ratio needs different according to dewatered sludge can repeat that above-mentioned ultrasonic wave is modified, the collaborative electroosmotic dewatering operation of pressure and adsorption dewatering process 1-5 time.
Sewage plant sludge dewatering unit provided by the present invention and technology mainly comprise the modified process of ultrasonic wave under the normal temperature condition of sewage plant sludge, the mechanism filter-pressing dehydration, the adsorption dewatering process of collaborative electroosmotic dewatering process of the pressure under the DC electric field effect and water-absorbing material.
The modified process of ultrasonic wave in this technology, the mechanism filter-pressing dehydration, the method that the adsorption dewatering process of collaborative electroosmotic dewatering process of the pressure under the DC electric field effect and water-absorbing material can adopt each process sequence to arrange is carried out continuous sludge dewatering, also can adopt each operation to concentrate in together and make the modified process of ultrasonic wave, the mechanism filter-pressing dehydration, the overlapping cross action of adsorption dewatering process of collaborative electroosmotic dewatering process of the pressure under the DC electric field effect and water-absorbing material carries out sludge dewatering at intermittence.
Adopt water-absorbing material to carry out the sludge absorption processed at mud water outlet place moisture aggregation zone in the collaborative electroosmotic dewatering process of mechanical pressure or after finishing, accelerate sludge dewatering speed.Each operation can be chosen in mud as required and is heated under the condition and operates temperature range 30-50 ℃ in this technology.The mud heating means can adopt steam or hot blast heating, can also adopt the interior logical hot solution of chuck to heat.
The mechanism filter-pressing machine can be that belt filter press also can be centrifugal, preferred belt filter press.Pressure assembly in the collaborative electroosmotic dewatering device of pressure can have belt and plate and frame etc.Belt pressure helps operate continuously, and negative electrode places the below of belt, and anode places the top, and the following rear mud that the adsorption dewatering device is arranged in cathode side removes the moisture aggregation zone.Sheet frame is suitable for periodical operation, and the DC electric field level applies, and negative electrode is arranged in the rear of dewatering unit, and the adsorption dewatering device is arranged in cathode side mud and removes the moisture aggregation zone.The adsorption dewatering material is a spongy material, and its material can be as polyvinyl alcohol, and urethane etc. have the material of water absorbing properties.
Pressure in this dewatering technology of mud is worked in coordination with electroosmotic dewatering DC electric field gradient scope 0.1-3V/mm, sludge filter cake thickness range 2-50mm.Because in the dehydration, hmc is in continuous attenuation, therefore the volts DS numerical value in the collaborative electroosmotic dewatering operation of pressure in the present invention is basis with the collaborative electroosmotic dewatering operation of pressure hmc originally.Ultrasonic frequency scope in the modified system of ultrasonic wave is 16-100kHz, and the ultrasonic wave specific energy consumption is input as the dried solid of 10-300kW.h/T.Sewage plant sludge in this dewatering technology of mud dehydration target can be set as the case may be as making moisture percentage in sewage sludge less than 70% etc.
One of gordian technique of the present invention is that the ultrasonic wave of sewage plant sludge is modified, change the sewage sludge solid particle property by physical chemistry effects such as hyperacoustic special high temperature, high pressure and jets, change the ratio of various moisture in the mud, thereby help sludge dewatering more, reduce the difficulty that pure mechanical dehydration process middle and later periods dehydration exists.Modified mud is under the collaborative electroosmotic dewatering effect of pressure, and the moisture in the mud main body makes water molecules shift to the mud cathodic area from the positive column of mud fast under electric field action, makes moisture removal in the mud of cathodic area under action of mechanical pressure.The collaborative electroosmotic dewatering technology of pressure makes in the sludge dewatering process in the mud main body moisture content gradient more consistent, helps giving full play to electric field action, quickens rate of water loss, better reduces moisture percentage in sewage sludge.When the collaborative electroosmotic dewatering speed of pressure is slow, pass through the ratio of various moisture in the modified change mud of ultrasonic wave again after, carry out the collaborative electroosmotic dewatering of pressure again moisture percentage in sewage sludge reduced.So interaction reaches high-level efficiency, fully reduces the purpose of moisture percentage in sewage sludge at low cost.
Two of gordian technique of the present invention is that sewage plant sludge adopts water-absorbing material to carry out adsorption dewatering at dewatering unit mud water outlet place moisture aggregation zone in the collaborative electroosmotic dewatering process of pressure or after finishing, thereby accelerate sludge dewatering speed, and make sludge dewatering more abundant easily.
The present invention is its device by the technology of carrying out alternately of modified process of the ultrasonic wave of mud and the collaborative electroosmotic dewatering process of mechanical pressure, low cost, high-level efficiency is carried out sludge dewatering fast, realize the low-water-content of mud, for follow-up mud low-cost processes is laid a good foundation.
Description of drawings
Fig. 1 is the schematic flow sheet of embodiment of the invention 1-4.
Fig. 2 is the schematic flow sheet of embodiment of the invention 5-8.
Fig. 3 is the structural representation of the collaborative electroosmotic dewatering device of belt pressure among the embodiment of the invention 1-2.
Fig. 4 is the structural representation of ultrasonic wave among the embodiment of the invention 3-4, the collaborative electroosmotic dewatering device of belt pressure.
Fig. 5 is the structural representation of the collaborative electroosmotic dewatering device of sheet frame pressure among the embodiment of the invention 5-6.
Fig. 6 is the structural representation of ultrasonic wave among the embodiment of the invention 7-8, the collaborative electroosmotic dewatering device of sheet frame pressure.
Fig. 7 is that the ultrasonic wave modifying device constitutes synoptic diagram among the embodiment of the invention 1-8.
Among the figure: 1-mud; 2-mechanism filter-pressing device; 3-pressure is worked in coordination with the electroosmotic dewatering device; 4-ultrasonic wave modifying device; The 5-anode metal rolls band; 6-cathodic metal with holes rolls band; The 7-water-absorbing material; The 8-direct supply; The 9-roll shaft; The 10-plate-and-frame filter press; 11-mud water outlet orifice plate; The 12-positive plate; 13-negative plate with holes; The 14-ultrasonic generator; The 15-ultrasonic transducer; The ultrasonic contact of 16-
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments:
Embodiment 1.
As shown in Figure 1, with water ratio is that 95% the spissated sewage plant sludge 1 of flocculation is sent into and carried out the mechanism filter-pressing dehydration in the belt filter press 2, when the mud mechanism filter-pressing is dewatered comparatively difficult, behind the rate of water loss slack-off (moisture percentage in sewage sludge is 82%), enter the collaborative electroosmotic dewatering device 3 of homemade belt pressure and carry out fast dewatering.The structural representation of device 3 as shown in Figure 3, dewatered sludge 1 enters from installing an end of 3, rotary action by roll shaft 9, anode metal roll with 5 and cathodic metal with holes roll with 6 drive under mud carry out to device 3 end, and by anode metal roll with 5 and cathodic metal with holes roll with 6 squeezing action sludge dewatering, and when starting direct supply 8 anode metal roll with 5 and cathodic metal with holes roll and form DC electric field between being with 6, thereby realize the acceleration dehydration to mud, wherein DC electric field intensity is 0.1V/mm.By regulating the transfer rate of travelling belt, control mud when leaving its dewatering speed be about and just enter 60% of the collaborative electroosmotic dewatering speed of belt pressure, mud leaves behind the collaborative electroosmotic dewatering device of homemade belt pressure and to enter by travelling belt that to carry out mud in the ultrasonic wave modifying device 4 modified.The ultrasonic wave modifying device is mainly by ultrasonic generator 14, and ultrasonic transducer 15 and ultrasonic contact 16 constitute (structural representation as shown in Figure 7).Ultrasonic contact 16 entered and carries out modified effect in the mud when mud was modified, ultrasonic frequency is 16kHz, specific power is input as the dried solid of 300kWh/T, mud after modified is sent into the collaborative electroosmotic dewatering device 3 of homemade mechanical tape type pressure once more from the ultrasonic wave modifying device and is carried out the collaborative electroosmotic dewatering of mechanical pressure, stop sludge dewatering more at need until sludge dewatering speed, this moment, moisture percentage in sewage sludge was 69.5%, filter cake thickness 50mm.Dewatered sludge is put into mud by transport unit and is deposited the pond, and mud removes moisture and collects sewage and deposit in the pond.
Technical process and device are as embodiment 1, different is: the following rear portion sludge water content aggregation zone of the cathode side of the collaborative electroosmotic dewatering device 3 of homemade belt pressure adopts urethane water-absorbing material 7 to carry out adsorption dewatering and handles (as shown in Figure 3), mud in collaborative electroosmotic dewatering processing of pressure and the ultrasonic wave mud modifier treatment operation adopts the hot blast heating, temperature is 50 ℃, volts DS gradient during the collaborative electroosmotic dewatering of pressure is handled is 3V/mm, ultrasonic frequency is 100kHz, specific power is input as the dried solid of 20kWh/T, ultrasonic wave is modified to be that the collaborative electroosmotic dewatering operation of pressure repeats 5 times, moisture percentage in sewage sludge after sludge dewatering finishes is 61.9%, filter cake thickness 2mm.
Technical process such as embodiment 2, different is: compare in this technology with the collaborative electroosmotic dewatering device of the pressure among the embodiment 2 with embodiment 1 and combine ultrasonic contact 16 in the collaborative electroosmotic dewatering device of pressure, ultrasonic contact 16 enters mud from the mud anode side and carries out ultrasonic modifiedly, and structural representation as shown in Figure 4.This device has been realized the ultrasonic wave upgrading, has been pressed the stack of considering with DC electric field osmosis three aspect effects.Mud heats with hot blast, Heating temperature is 40 ℃, the volts DS gradient is 1.5V/mm, ultrasonic frequency is 60kHz, specific power is input as the dried solid of 30kWh/T, ultrasonic wave is modified to be repeated 3 times with ultrasonic wave, the collaborative electroosmotic dewatering operation of pressure, and the moisture percentage in sewage sludge after sludge dewatering finishes is 65.9%, filter cake thickness 6mm.
Technical process such as embodiment 3, different is: ultrasonic contact 16 enters mud from the mud cathode side and carries out modified operation in the collaborative electroosmotic dewatering device of ultrasonic wave, belt pressure, the mud Heating temperature is 30 ℃, DC electric field gradient during ultrasonic wave, the collaborative electroosmotic dewatering of pressure are handled is 2V/mm, ultrasonic frequency is 40kHz, specific power is input as the dried solid of 200kWh/T, ultrasonic wave is modified only carries out 1 time with ultrasonic wave, the collaborative electroosmotic dewatering operation of pressure, moisture percentage in sewage sludge after sludge dewatering finishes is 67.6%, filter cake thickness 10mm.
As shown in Figure 2, with water ratio is that 97.5% concentrated sewage plant sludge is sent into and carried out press filtration in the plate and frame filter-pressing device 2, stop the mechanism filter-pressing dehydration when moisture percentage in sewage sludge is 83%, mud is sent into subsequent processing and is carried out carrying out the sludge dewatering operation in the collaborative electroosmotic dewatering device 3 of plate and frame mechanical pressure.Pressure is worked in coordination with osmosis device 3 structural representations as shown in Figure 5, and 10 is filter press equipment, and 11 is bottom mud water outlet orifice plate, and 12 is positive plate, and 13 is negative plate with holes.Dewatered sludge enters this device back and carry out mechanical dehydration under the effect of machinery pressure worry 10, after connecting direct supply 8, between positive plate 12 and negative plate 13, form DC electric field, mud is carried out electroosmotic dewatering, sludge dewatering moisture spills from the perforated plate 11 and the negative plate 13 of device bottom, when the collaborative electroosmotic dewatering speed of mud pressure for its initial rate of water loss 60% the time stop this operation, carry out the adsorption dewatering operation with urethane water-absorbing material 7 anticathode side moisture aggregation zones, mud leaves the adsorption dewatering operation and enters the modified operation 4 of ultrasonic wave after Sludge Surface moisture fully adsorbs.The ultrasonic wave modifying device constitutes with embodiment 1-4.Enter after mud is modified in the collaborative electroosmotic dewatering device of pressure and carry out sludge dewatering, carry out the sludge absorption dehydration after dehydration finishes again, carry out once more after the adsorption dewatering operation that ultrasonic wave is modified, the collaborative electroosmotic dewatering operation of mechanical pressure.Mud is heated to 30 ℃ in this technology under the hot blast effect, and the dewatered sludge water ratio during end is 65.4%.DC electric field intensity is 2.0V/mm in this technology, and ultrasonic frequency is 40kHz, and specific power is input as the dried solid of 30kW.h/T, filter cake thickness 8mm.
Device and flow process are with embodiment 5.Different is local as follows: DC electric field intensity is 1.5V/mm, ultrasonic frequency is 60kHz, the ultrasonic wave specific power is input as the dried solid of 100kW.h/T, the repetition ultrasonic wave is modified works in coordination with electroosmotic dewatering 2 times with pressure, 35 ℃ of mud temperature, the final water ratio of dewatered sludge is 66.5%, filter cake thickness 15mm.
Technical process such as embodiment 5.Difference is as follows: add the modified function of ultrasonic wave in the collaborative electroosmotic dewatering device of pressure, realized the ultrasonic wave upgrading, pressed the stack of considering with DC electric field osmosis three aspect effects; Its structure as shown in Figure 6, ultrasonic contact 16 enters mud from the mud cathode side and carries out modified; DC electric field intensity is 2.5V/mm, ultrasonic frequency is 60kHz, the ultrasonic wave specific power is input as the dried solid of 150kW.h/T, do not carry out the modified and ultrasonic wave of repetition ultrasonic wave, the collaborative electroosmotic dewatering operation of pressure, 40 ℃ of mud temperature, the final water ratio of dewatered sludge is 66.9%, filter cake thickness 25mm.
Technical process such as embodiment 7.Difference is: ultrasonic wave is sent out contact 16 from the anode side of mud rather than enter mud from cathode side and carry out the mud upgrading in ultrasonic wave in this technology, the collaborative electroosmotic dewatering device of pressure, DC electric field intensity is 3V/mm, filter cake thickness 20mm, moisture percentage in sewage sludge are 66.4%.
Open and the dewatering technology of mud that proposes of the present invention, those skilled in the art can be by using for reference this paper content, and links such as appropriate change operational path and parameter realize.Method of the present invention is described by preferred embodiment, and person skilled obviously can be changed or suitably change and combination method as herein described in not breaking away from content of the present invention, spirit and scope, realizes the technology of the present invention.Special needs to be pointed out is, the replacement that all are similar and change apparent to those skilled in the artly, they are regarded as being included in spirit of the present invention, scope and the content.
Claims (6)
1. sludge dewatering treatment device, comprise the mechanism filter-pressing device, ultrasonic wave modifying device and pressure are worked in coordination with the electroosmotic dewatering device, and adsorption dewatering material apparatus, it is characterized in that: dewatering unit one side that the negative electrode in the collaborative electroosmotic dewatering device of pressure places mud, anode places the opposing party of mud; The ultrasonic wave modifying device mainly comprises ultrasonic generator, and ultrasonic transducer and ultrasonic contact three parts are formed.
2. the treatment process of sludge dewatering treatment device as claimed in claim 1, it is characterized in that, the Sewage Plant thickened sludge is sent into the mechanism filter-pressing device and is carried out press filtration, when sludge moisture content reaches 80-85%, the collaborative electroosmotic dewatering device of trigger pressure carries out sludge dewatering, work in coordination with 60% when following of electroosmotic dewatering speed when the rate of water loss of pressure collaborative osmosis carrying out sludge dewatering is slack-off for its original pressure, stop the collaborative electroosmotic dewatering device of pressure, starting the ultrasonic wave modifying device carries out modified to dewatered sludge, mud after modified adopts the collaborative electroosmotic dewatering device of pressure to carry out sludge dewatering again, pressure is worked in coordination with electroosmotic dewatering DC electric field gradient scope 0.1-3V/mm, the ultrasonic frequency scope is 16-100kHz, the ultrasonic wave specific energy consumption is input as the dried solid of 10-300kW.h/T, sludge filter cake thickness range 2-50mm.
3. sewage sludge processed technology as claimed in claim 2 is characterized in that, described ultrasonic wave is modified, pressure is worked in coordination with the electroosmotic dewatering operation and the adsorption dewatering process repeats 1-5 time.
4. sewage sludge processed technology as claimed in claim 2, it is characterized in that, the modified process of described ultrasonic wave, the mechanism filter-pressing dehydration, the method that the adsorption dewatering process of collaborative electroosmotic dewatering process of the pressure under the DC electric field effect and water-absorbing material adopts each process sequence to arrange is carried out continuous sludge dewatering, or adopt each operation to concentrate in together to make the modified process of ultrasonic wave, the mechanism filter-pressing dehydration, the overlapping cross action of adsorption dewatering process of collaborative electroosmotic dewatering process of the pressure under the DC electric field effect and water-absorbing material carries out sludge dewatering at intermittence.
5. sewage sludge processed technology as claimed in claim 2 is characterized in that described mud is heated under the condition and operates, temperature range 30-50 ℃.
6. sewage sludge processed technology as claimed in claim 2, it is characterized in that, in the described sewage sludge processed technology, mud adopts water-absorbing material to carry out adsorption dewatering at dewatering unit mud water outlet place moisture aggregation zone in the collaborative electroosmotic dewatering process of pressure or after finishing, thereby accelerate sludge dewatering speed, and make sludge dewatering more abundant easily.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100163502A CN100542652C (en) | 2006-10-30 | 2006-10-30 | Dewatering technology of mud and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100163502A CN100542652C (en) | 2006-10-30 | 2006-10-30 | Dewatering technology of mud and device |
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| CN1948192A true CN1948192A (en) | 2007-04-18 |
| CN100542652C CN100542652C (en) | 2009-09-23 |
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| 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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2006
- 2006-10-30 CN CNB2006100163502A patent/CN100542652C/en not_active Expired - Fee Related
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