CN110668673A - Biochemical sludge electroosmosis dewatering device - Google Patents
Biochemical sludge electroosmosis dewatering device Download PDFInfo
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- CN110668673A CN110668673A CN201911161160.3A CN201911161160A CN110668673A CN 110668673 A CN110668673 A CN 110668673A CN 201911161160 A CN201911161160 A CN 201911161160A CN 110668673 A CN110668673 A CN 110668673A
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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
- C02F11/15—Treatment of sludge; Devices therefor by de-watering, drying or thickening by treatment with electric, magnetic or electromagnetic fields; by treatment with ultrasonic waves
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Abstract
An electroosmosis dehydration device for biochemical sludge comprises a power supply, a perforated negative plate connected with the power supply, a flat ceramic membrane closely adjacent to the perforated negative plate, a biochemical sludge storage tank, an anode plate, a vacuum water collecting device, a backwashing device, a purging and aerating device and a conical clamping groove for storing solid matters; the flat ceramic membrane and the negative plate with holes form a cathode membrane together, the upper end of the flat ceramic membrane is connected with a vacuum water collecting device, the vacuum water collecting device is used for collecting collected, electrolyzed and clarified filtrate flowing from the negative plate with holes and the flat ceramic membrane during dehydration operation, and the lower end of the flat ceramic membrane is connected with a backwashing device used for backwashing the flat ceramic membrane to prevent soil particles from being blocked through a pipeline; the flat ceramic membrane, the negative plate with holes and the positive plate form an electroosmosis dehydration structure body, the conical clamping groove for storing the solid matters internally comprises a plurality of groups of electroosmosis dehydration structure bodies, and the arranged electroosmosis dehydration structure bodies gradually extend along the direction of the taper reduction. The invention can reduce the discharge amount of biochemical sludge and reduce environmental pollution.
Description
Technical Field
The invention relates to the field of slurry dehydration, in particular to an electroosmosis dehydration device for biochemical sludge, which is mainly used for treating concentrated biochemical sludge for treating urban domestic sewage, industrial sewage and aquaculture wastewater.
Background
At present, in the deep dehydration of biochemical sludge, the volume reduction of the sludge can be realized by adding medicaments such as lime, ferric chloride and the like for conditioning and plate-frame filter pressing, and the aim of meeting the mechanical requirement of sludge landfill after deep dehydration is fulfilled.
In the past, canned vehicles (biochemical sludge vehicles) are mainly used for outward transportation and the like, but the problems of long treatment period, high cost and the like exist. Currently, a membrane filtration method, a centrifugation method, a screw extrusion method, a rotary extrusion method, an electroosmosis method, and the like are commonly used. Wherein, the membrane filtration method is only generally applicable to biochemical sludge with the solid content less than 1.5 percent; the centrifugal method has large energy consumption, needs to add chemical flocculant, has relatively large noise, expensive accessories and large repair difficulty; the spiral pressure method has small treatment capacity, large occupied space, low solid content after treatment and large chemical flocculating agent amount; the rotary extrusion method only aims at the biochemical sludge with high fiber content, and has good adaptability, low processing capacity and high equipment cost.
The solid content of the supernatant obtained by the mechanical sludge dewatering is high, the blockage of a supernatant return pipe is easily caused, the abrasion of a main machine is serious, and the cleaning is time-consuming and labor-consuming due to the agglomeration and siltation in the pipeline and on the stirrer of the automatic flocculant dosing device.
At present, the electroosmosis dehydration method is immature in technology, relatively high in energy consumption, high in solid content (5-20%) required in sludge treatment, small in treatment amount and high in cost. Furthermore, in existing treatment plants, attention is often paid only to the removal of free water from the sludge, and the treatment of capillary water is neglected.
Disclosure of Invention
The invention provides an electroosmosis dehydration device for biochemical sludge, which utilizes an electrolysis-vacuum combined filtration process to treat free water and capillary water in the sludge so as to achieve the purpose of sludge reduction treatment.
The technical scheme adopted by the invention for solving the problems is as follows: the electrolysis-vacuum combined slurry filtering dehydration is characterized in that sludge-water separation is realized under the action of an electric field, and the obtained clarified filtrate is recycled, so that the electrodialysis dehydrator mainly comprises a power supply 1, a porous cathode plate 2 connected with the power supply 1, a flat ceramic membrane 3 adjacent to the porous cathode plate 2, a biochemical sludge storage tank 4, an anode plate 5, a vacuum water collecting device 6, a back washing device 7, a purging and aerating device 8 and a solid storage conical clamping groove 9, wherein the porous cathode plate 2 is connected with the negative pole of the power supply 1, and the anode plate 5 is connected with the positive pole of the power supply 1; the flat ceramic membrane 3 and the negative plate with holes form a cathode membrane together, the upper end of the flat ceramic membrane 3 is connected with a vacuum water collecting device 6, the vacuum water collecting device 6 is used for collecting collected electrolytic clarification filtrate flowing from the negative plate with holes 2 and the flat ceramic membrane 3 during dehydration operation, and the lower end of the flat ceramic membrane 3 is connected with a back washing device 7 used for back washing the flat ceramic membrane 3 to prevent soil particles from being blocked through a pipeline; the bottom of the biochemical sludge storage tank 4 is provided with a solid storage conical clamping groove 9 and a purging and aerating device 8, the flat ceramic membrane 3, the porous cathode plate 2 and the anode plate 5 form an electroosmosis dehydration structure, the solid storage conical clamping groove 9 is internally provided with a plurality of groups of electroosmosis dehydration structures, and the arranged electroosmosis dehydration structures extend gradually along the direction of taper reduction.
Alternatively, the positive pole of the power source 1 is connected to the anode plate 5 and the negative pole of the power source 1 is connected to the cathode plate 2.
Alternatively, the anode plate 5 is an iron or aluminum plate, the perforated cathode plate 2 is a perforated iron or aluminum plate, and the perforated cathode plate 2 and the flat ceramic membrane 3 together form a cathode membrane
Alternatively, the perforated cathode plates 2 and anode plates 5 are arranged in an array.
Optionally, a vacuum water collecting device 6 is connected to the flat ceramic membrane 3 through a vacuum pump and a pipeline for collecting the clarified filtrate.
Optionally, a back-flushing device 7 is connected to the lower end of the flat ceramic membrane 3 through a pipe for back-flushing it with fresh water or high-pressure air.
Optionally, the conical clamping groove 9 for storing the solid matters is detachably arranged below the biochemical sludge storage tank 4.
Alternatively, the flat ceramic membrane 3, the perforated cathode plate 2 and the anode plate 5 are all vertically arranged at the bottom of the biochemical sludge storage tank 4.
Optionally, a horizontal-tank type purging aeration device 8 is arranged at the bottom of the biochemical sludge storage tank 4 for generating high-pressure shearing airflow for purging along the section of the perforated cathode plate 2 and the anode plate 5.
Optionally, the electro-osmotic dehydration structure is provided with more than two groups.
Alternatively, the pipe connected to the back-washing unit 7 and the pipe connected to the purge aeration unit 8 are arranged along the wall surface of the cone in a tapered shape.
Optionally, the vacuum water collecting device 6 comprises a vacuum water collecting tank and a vacuum pump which are communicated with the flat ceramic membrane 3 through a pipeline, and the vacuum water collecting tank and the vacuum pump penetrate through the cathode plate 2 with holes to flow into the flat ceramic membrane 3 and finally converge into the vacuum water collecting tank.
Optionally, high-pressure shearing airflow, namely the blowing aeration 8, is introduced to the bottom of the biochemical sludge storage tank 4 along the wall of the tank, so that the slurry is stirred to roll, and pollution of the flat ceramic membrane and the electrode plate is prevented.
The vacuum water collecting device 6 is connected with the bottom of the flat ceramic membrane 3 through a pipeline, and clear filtrate is collected by utilizing negative pressure generated by vacuumizing. The anode plate 5 gathers soil particles in the electrolytic process, and a solid object storage conical clamping groove 9 for detachably storing the soil particles is arranged at the bottom of the anode plate, so that the soil particles can be periodically removed.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method is suitable for treating the biochemical sludge in the concentration tank in the treatment process of urban domestic sewage, industrial sewage and aquaculture wastewater, not only saves the operation cost, but also can reduce the discharge amount of the biochemical sludge and reduce the environmental pollution.
(2) By the combined filtering process of electrolysis and vacuum, capillary water and free water in the biochemical sludge are removed simultaneously, the biochemical sludge is subjected to reduction treatment, the efficiency of biochemical sludge treatment is improved, and the effect of reduction treatment is enhanced.
(3) The biochemical sludge with high solid content (5-20%) can be treated, sludge drying procedures such as plate-frame filter pressing, screw stacking machines and the like are simplified, and energy consumption is low.
(4) Because the array is arranged, the treatment capacity is large by designing along with the size of the concentration tank.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic view of an overall apparatus;
FIG. 2 is a schematic view of an electrode array arrangement;
fig. 3 is a schematic view of a tapered slot for storing solids for storing slurry.
Reference numerals: 1. a power source; 2. a negative plate with holes; 3. a flat ceramic membrane; 4. a biochemical sludge storage tank; 5. an anode plate; 6. a vacuum water collection device; 7. a backwashing device; 8. purging the aeration device; 9. a conical clamping groove for storing solid objects; 91. a sludge pump; 92. sludge discharge pipes.
Detailed Description
The invention provides a simple, effective and low-cost electroosmosis dehydration device for biochemical sludge, wherein the electrolysis-vacuum combined slurry filtration dehydration is actually to realize sludge-water separation under the action of an electric field, and the obtained clarified filtrate is recycled, so that the electroosmosis dehydration device mainly comprises a power supply 1, a porous cathode plate 2 connected with the power supply 1, a flat ceramic membrane 3 adjacent to the porous cathode plate 2, a biochemical sludge storage tank 4, an anode plate 5, a vacuum water collecting device 6, a backwashing device 7, a purging aeration device 8 and a solid storage conical clamping groove 9, wherein the porous cathode plate 2 is connected with the cathode of the power supply 1, and the anode plate 5 is connected with the anode of the power supply 1; the flat ceramic membrane 3 and the negative plate with holes form a cathode membrane together, the upper end of the flat ceramic membrane 3 is connected with a vacuum water collecting device 6, the vacuum water collecting device 6 is used for collecting collected electrolytic clarification filtrate flowing from the negative plate with holes 2 and the flat ceramic membrane 3 during dehydration operation, and the lower end of the flat ceramic membrane 3 is connected with a back washing device 7 used for back washing the flat ceramic membrane 3 to prevent soil particles from being blocked through a pipeline; the bottom of the biochemical sludge storage tank 4 is provided with a solid storage conical clamping groove 9 and a purging and aerating device 8, the solid storage conical clamping groove 9 is used for collecting positive ion soil particles which are stored near the anode plate 5 during dehydration, and the purging and aerating device 8 is used for blowing high-pressure gas to stir slurry to roll; the electroosmosis dehydration structure body is composed of the flat ceramic membrane 3, the negative plate 2 with holes and the positive plate 5, the conical clamping groove 9 for storing the solid matters is internally provided with a plurality of groups of electroosmosis dehydration structure bodies, the arranged electroosmosis dehydration structure bodies extend gradually along the direction that the cone reduces, the area of the plate electrode can be effectively increased through the structure, and the biochemical sludge dehydration efficiency is further improved.
The main working principle of the invention is as follows: under the action of an external direct current electric field, free water and bound water (cell water) in the sludge are concentrated on the surface of the sludge under the influence of the electric field force; the sludge particles are negatively charged, and the free water and the bound water are positively charged; the two charges respectively move towards the anode and the cathode in a directional way (electrophoresis principle); water molecules pass through the cathode membrane, so that mud and water are separated (electrodialysis effect), sludge particles are concentrated at the anode, and dehydration is realized.
The biochemical sludge dewatering device provided by the invention utilizes the triple effects of electrophoresis, electrodialysis and vacuum, and no medicament is required to be added in the dewatering process, so that further dewatering and volume reduction of sludge are realized, the quality of the sludge after re-dewatering is ensured to be unchanged, and the adverse effect on subsequent treatment and disposal is reduced.
More specifically, the flat ceramic membrane 3, the perforated cathode plate 2 and the anode plate 5 are all vertically fixed at the bottom of the biochemical sludge storage tank 4, and are connected with corresponding pipelines and a vacuum water collecting device 6.
Alternatively, the power supply 1 may be a dc power supply connected to a battery, or may be an ac rectified dc power supply, and is configured according to the actual situation of the construction site.
Alternatively, the positive pole of the power source 1 is connected to the anode plate 5 and the negative pole of the power source 1 is connected to the cathode plate 2.
Alternatively, the anode plate 5 is an iron or aluminum plate, the perforated cathode plate 2 is a perforated iron or aluminum plate, and the perforated cathode plate 2 and the flat ceramic membrane 3 together constitute a cathode membrane.
Alternatively, the perforated cathode plates 2 and anode plates 5 are arranged in an array.
Optionally, a vacuum water collecting device 6 is connected to the flat ceramic membrane 3 through a vacuum pump and a pipeline for collecting the clarified filtrate.
Optionally, the backwashing device 7 is connected to the lower end of the flat ceramic membrane 3 through a pipeline for backwashing with clean water or high-pressure air to prevent sludge from contaminating or clogging the flat ceramic membrane.
Optionally, the conical clamping groove 9 for storing the solid matters is detachably arranged below the biochemical sludge storage tank 4.
Alternatively, the flat ceramic membrane 3, the perforated cathode plate 2 and the anode plate 5 are all vertically arranged at the bottom of the biochemical sludge storage tank 4.
Optionally, a horizontal-tank type purging aeration device 8 is arranged at the bottom of the biochemical sludge storage tank 4 for generating high-pressure shearing airflow for purging along the section of the perforated cathode plate 2 and the anode plate 5.
Optionally, the electro-osmotic dehydration structure is provided with more than two groups.
The pipeline connected with the back washing device 7 and the pipeline connected with the sweeping aeration device 8 are both arranged along the wall surface of the cone in a conical shape. Through the structural form, the electroosmosis dewatering structure can be well matched with the electroosmosis dewatering structure, the functions of backwashing and sweeping aeration can be better realized, meanwhile, the spaces among the backwashing device 7, the sweeping aeration device 8, the electrode plate and the flat ceramic membrane are fully utilized, the area of the electrode plate array is increased, and the electroosmosis dewatering efficiency is higher.
Optionally, the vacuum water collecting device 6 comprises a vacuum water collecting tank and a vacuum pump which are communicated with the flat ceramic membrane 3 through a pipeline, and the vacuum water collecting tank and the vacuum pump penetrate through the cathode plate 2 with holes to flow into the flat ceramic membrane 3 and finally converge into the vacuum water collecting tank.
Optionally, high-pressure shearing airflow, namely the blowing aeration 8, is introduced to the bottom of the biochemical sludge storage tank 4 along the wall of the tank, so that the slurry is stirred to roll, and pollution of the flat ceramic membrane and the electrode plate is prevented.
The vacuum water collecting device 6 is connected with the bottom of the flat ceramic membrane 3 through a pipeline, and clear filtrate is collected by utilizing negative pressure generated by vacuumizing. The anode plate 5 gathers soil particles in the electrolytic process, and a solid object storage conical clamping groove 9 for detachably storing the soil particles is arranged at the bottom of the anode plate, so that the soil particles can be periodically removed.
When the equipment starts to operate, the power supply 1 is switched on, an electric field is formed between the cathode plate 2 with holes and the anode plate 5, capillary water and free water in slurry can flow to the cathode plate 2 with holes under the action of the electric field, and slurry particles and soil particles are gathered on the anode plate 5. The negative plate 2 with holes is a plate with holes, clarified filtrate gathered near the cathode is started, a vacuum pump is started to enable the inner cavity of the flat ceramic membrane 3 to generate negative pressure, and the clarified filtrate close to the flat ceramic membrane group 3 enters the vacuum water collecting device 6 along the ceramic membrane holes under the filter pressing effect. The soil particles can be periodically cleaned, treated, maintained and the like through the disassembly of the conical clamping groove 9 for storing the solid matters.
The horizontal-groove type purging and aerating device 8 is arranged at the bottom of the biochemical sludge storage tank 4, so that high-pressure shearing airflow can be purged along the tangent planes of the porous cathode plate 2 and the porous anode plate 5, mud is stirred to roll, and the flat ceramic membrane 3, the porous cathode plate 2 and the porous anode plate 5 are prevented from being polluted. The purging and aerating device 8 is arranged below the flat ceramic membrane 3, the porous cathode plate 2 and the porous anode plate 5.
And (3) starting the backwashing device 7 from time to time, and periodically backwashing the flat ceramic membrane group 3 by using clean water or high-pressure airflow to prevent slurry from polluting or blocking the ceramic membrane. And continuously starting the purging aeration device 8, purging the high-pressure shearing airflow along the tangent plane of the porous cathode plate 2, the porous anode plate 5 and the porous ceramic membrane 3, stirring slurry to roll, and preventing the pollution of the porous cathode plate 2, the porous anode plate 5 and the porous ceramic membrane 3. The dewatered sludge can be discharged from the sludge discharge pipe 92 after the suction of the sludge pump 91 is started, and the conical clamping groove 9 for storing solid matters is detached for periodic cleaning treatment, equipment maintenance and the like.
The working principle of the invention is as follows: under the action of an external direct current electric field, free water and bound water in the slurry are densely gathered on the surface of the slurry under the influence of the electric field force; the slurry particles are negatively charged, and the free water and the bound water are positively charged; the two charges respectively move towards the anode plate and the cathode plate in a directional manner; water molecules pass through the cathode plate membrane, so that mud and water are separated, mud particles are concentrated at the anode plate, and mud dehydration is realized.
The anode and cathode of the electrode are both hollow aluminum or iron plates with holes, and after direct current is introduced and a direct current generator or a direct current welding machine is adopted, soil particles with negative charges move to the anode plate, namely electrophoresis is performed, and water with positive charges is concentrated to the cathode plate, so that an electroosmosis phenomenon is generated. Under the double action of electroosmosis and vacuum in the porous hollow plate, water in the clay is forced to be rapidly discharged from the porous hollow plate, and the porous hollow plate continuously pumps water, so that the dehydration of the slurry is realized.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention can be implemented by the prior art.
Claims (10)
1. The electroosmosis dehydration device for biochemical sludge is characterized in that: comprises a power supply (1), a negative plate (2) with holes connected with the power supply (1), a flat ceramic membrane (3) adjacent to the negative plate (2) with holes, a biochemical sludge storage tank (4), a positive plate (5), a vacuum water collecting device (6), a back washing device (7), a purging aeration device (8) and a conical clamping groove (9) for storing solid matters; the flat ceramic membrane (3) and the negative plate (2) with holes form a cathode membrane together, the upper end of the flat ceramic membrane (3) is connected with a vacuum water collecting device (6), the vacuum water collecting device (6) is used for collecting collected electrolytic clarified filtrate flowing from the negative plate (2) with holes and the flat ceramic membrane (3) during dehydration operation, the lower end of the flat ceramic membrane (3) is connected with a back washing device (7) used for performing back washing on the flat ceramic membrane (3) to prevent soil particle blockage, and the bottom of the biochemical sludge storage tank (4) is provided with a conical clamping groove (9) for storing solid matters and a purging and aerating device (8); the electroosmosis dehydration structure body is composed of a flat ceramic membrane (3), a negative plate (2) with holes and a positive plate (5), a plurality of groups of electroosmosis dehydration structure bodies are arranged in the conical clamping groove (9) for storing the solid matters, and the arranged electroosmosis dehydration structure bodies gradually extend along the direction of the taper.
2. The electroosmotic dewatering device for biochemical sludge according to claim 1, wherein: the positive pole of the power supply (1) is connected with the positive plate (5), and the negative pole of the power supply (1) is connected with the negative plate (2).
3. The electroosmotic dewatering device for biochemical sludge according to claim 1, wherein: the anode plate (5) is an iron or aluminum plate, the cathode plate (2) with holes is an iron or aluminum plate with holes, and the cathode plate (2) with holes and the flat ceramic membrane (3) form a cathode membrane together.
4. The electroosmotic dewatering device for biochemical sludge according to claim 1, wherein: the perforated cathode plates (2) and the perforated anode plates (5) are arranged in an array.
5. The electroosmotic dewatering device for biochemical sludge according to claim 1, wherein: the vacuum water collecting device (6) is connected with the flat ceramic membrane (3) through a vacuum pump and a pipeline and is used for collecting clear filtrate.
6. The electroosmotic dewatering device for biochemical sludge according to claim 1, wherein: the back washing device (7) is connected with the lower end of the flat ceramic membrane (3) through a pipeline and is used for back washing the flat ceramic membrane by adopting clean water or high-pressure airflow.
7. The electroosmotic dewatering device for biochemical sludge according to claim 1, wherein: the conical clamping groove (9) for storing the solid matters is detachably arranged below the biochemical sludge storage groove (4).
8. The electroosmotic dewatering device for biochemical sludge according to claim 1, wherein: the flat ceramic membrane (3), the porous cathode plate (2) and the anode plate (5) are all vertically arranged at the bottom of the biochemical sludge storage tank (4).
9. The electroosmotic dewatering device for biochemical sludge according to claim 1, wherein: a horizontal-groove type purging and aerating device (8) is arranged at the bottom of the biochemical sludge storage tank (4) and used for generating high-pressure shearing airflow for purging along the tangent planes of the perforated cathode plate (2) and the anode plate (5).
10. An electroosmotic dewatering device for biochemical sludge according to claims 1-9, wherein: the pipeline connected with the back washing device (7) and the pipeline connected with the sweeping aeration device (8) are arranged along the wall surface of the cone in a conical shape.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911161160.3A CN110668673A (en) | 2019-11-24 | 2019-11-24 | Biochemical sludge electroosmosis dewatering device |
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| CN201911161160.3A CN110668673A (en) | 2019-11-24 | 2019-11-24 | Biochemical sludge electroosmosis dewatering device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111450705A (en) * | 2020-05-11 | 2020-07-28 | 江门市崖门新财富环保工业有限公司 | Immersed membrane module ultrafiltration filter device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110422956A (en) * | 2019-07-15 | 2019-11-08 | 湖南大学 | A kind of shield slurry dehydration device |
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- 2019-11-24 CN CN201911161160.3A patent/CN110668673A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110422956A (en) * | 2019-07-15 | 2019-11-08 | 湖南大学 | A kind of shield slurry dehydration device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111450705A (en) * | 2020-05-11 | 2020-07-28 | 江门市崖门新财富环保工业有限公司 | Immersed membrane module ultrafiltration filter device |
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