CN110550848A - Horizontal-arranged cathode vacuum electroosmosis sludge dewatering device and method - Google Patents
Horizontal-arranged cathode vacuum electroosmosis sludge dewatering device and method Download PDFInfo
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- CN110550848A CN110550848A CN201910846933.5A CN201910846933A CN110550848A CN 110550848 A CN110550848 A CN 110550848A CN 201910846933 A CN201910846933 A CN 201910846933A CN 110550848 A CN110550848 A CN 110550848A
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
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- Hydrology & Water Resources (AREA)
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- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a horizontally-arranged cathode vacuum electroosmosis sludge dewatering device and a horizontally-arranged cathode vacuum electroosmosis sludge dewatering method, wherein the horizontally-arranged cathode vacuum electroosmosis sludge dewatering device comprises a sludge tank, a filter pipe network is horizontally laid in the sludge tank, a planar cathode is flatly laid above the filter pipe network in a manner of clinging to the ground, the planar cathode and the filter pipe network are both embedded into sludge in the sludge tank, a planar anode is arranged on the upper surface of the sludge in the sludge tank, the planar anode is electrically connected with an anode of a direct-current power supply, and the planar cathode is electrically connected with a cathode of the direct-current power supply; and a water-gas separation device is arranged on the edge of the sludge tank, one end of the water-gas separation device is communicated with the vacuum pump, and the other end of the water-gas separation device is communicated with the filter pipe network. According to the invention, the filter pipe network and the planar cathode are sequentially arranged at the bottom of the sludge tank from bottom to top, and the planar anode is laid on the surface of the sludge, so that the gravity field and the electric field can be fully and effectively utilized, and water in the sludge is separated from the sludge under the combined action of the electric field and the gravity field.
Description
Technical Field
the invention belongs to the technical field of sludge dewatering treatment, and particularly relates to a horizontally-arranged cathode vacuum electroosmosis sludge dewatering device and method.
Background
In the newly-built, widened and desilting projects of inland river channels, navigation channels and lakes, a large amount of black and odorous sludge is inevitably generated, and the harmless treatment of the black and odorous sludge becomes a difficult problem to be researched and solved urgently. Dredged sludge has high water content, high content of sticky particles and poor permeability, and after being stored for one or two years, the surface of the dredged sludge is dried, but the internal structure of the dredged sludge is still in aqueous jelly shape, so that the dredged sludge cannot be beneficially utilized. Therefore, the development of a rapid dehydration technology of a dredging sludge storage yard which is suitable for the requirement of inland lake dredging engineering in China is urgently needed.
after applying a potential to two ends of a soil body with a large water content, cations in the soil move towards the cathode, and the cations simultaneously drag water to enable the water to move towards the cathode to form water flow movement, which is called electroosmosis. The permeability coefficient in the electroosmosis process is the superposition of the electroosmosis coefficient and the hydraulic permeability coefficient. When the traditional electroosmosis method is used for treating soft soil, the electrodes are usually inserted into the soft soil in the vertical direction. However, the method is not suitable for sludge dehydration treatment because the sludge has extremely high water content and extremely large deformation after dehydration, the electrode is exposed due to the sedimentation of the surface of the sludge, and the effective length of the electrode is reduced; the lateral contraction makes the vertical crack wide and blocks the current in the soil body.
Disclosure of Invention
A first object of the present invention is to provide a horizontally arranged cathode vacuum electro-osmotic sludge dewatering device, which addresses the deficiencies in the prior art.
For this reason, the above object of the present invention is achieved by the following technical solutions:
the horizontally arranged cathode vacuum electroosmosis sludge dewatering device is characterized by comprising a sludge tank, wherein a filter pipe network is horizontally laid in the sludge tank, a planar cathode is flatly laid above the filter pipe network in a manner of clinging to the ground, the planar cathode and the filter pipe network are both embedded into sludge in the sludge tank, a planar anode is arranged on the upper surface of the sludge in the sludge tank, the planar anode and the two planes of the planar cathode are arranged in parallel and correspondingly, the planar anode is electrically connected with a positive electrode of a direct-current power supply, and the planar cathode is electrically connected with a negative electrode of the direct-current power supply; and a water-gas separation device is arranged on the edge of the sludge tank, one end of the water-gas separation device is communicated with the vacuum pump, and the other end of the water-gas separation device is communicated with the filter pipe network.
While adopting the technical scheme, the invention can also adopt or combine the following technical scheme:
As a preferred technical scheme of the invention, the planar cathode comprises a plurality of parallel reinforcing steel bars, and the reinforcing steel bars are closely paved above the filter tubes of the filter tube network.
As a preferred technical scheme of the invention, the planar anode is a steel wire mesh.
In a preferred embodiment of the present invention, the water-gas separator is a water-gas separator, and the water and gas sucked out of the filter pipe network by the vacuum pump stay in the water-gas separator, and the gas is then sucked out by the vacuum pump, and the water entrained in the gas is temporarily stored in the water-gas separator.
as a preferable technical scheme of the invention, the filter tube in the filter tube net comprises an outer filter layer and a drainage channel communicating the filter layer with the interior of the filter tube.
In a preferred embodiment of the present invention, a sealing cap is disposed at an end of the filter tube in the filter tube network, where the filter tube contacts with the sludge, and the sealing cap is used to seal the end of the filter tube to prevent the sludge from entering the filter tube.
It is a further object of the present invention to address the deficiencies of the prior art by providing a method for dewatering horizontally disposed cathodic vacuum electroosmotic sludge.
Therefore, the above purpose of the invention is realized by the following technical scheme:
A horizontally arranged cathode vacuum electro-osmotic sludge dewatering method based on the horizontally arranged cathode vacuum electro-osmotic sludge dewatering device described hereinbefore and comprising the steps of:
(1) Building a sludge pond near or at a designated position of a river section involved in the engineering;
(2) Splicing the filter pipes into a filter pipe network according to the size of the sludge tank, and horizontally paving the filter pipe network at the bottom of the sludge tank;
(3) Arranging the steel bars in the planar cathode and the filter tubes in the filter tube network correspondingly, ensuring that at least one filter tube is arranged below the steel bars in the planar cathode, and fixing; the steel bar in the plane cathode is electrically connected with the negative pole of the direct current power supply by a lead;
(4) Stacking the cleared sludge in a sludge tank, and burying a planar cathode and a filter pipe network in the sludge tank into the sludge;
(5) Laying a planar anode on the surface of sludge in the sludge tank, and electrically connecting the planar anode and the anode of the direct-current power supply by using a lead;
(6) And starting the vacuum pump, starting the direct-current power supply, dehydrating the sludge, continuously reducing the distance between the planar anode and the planar cathode along with the continuous sedimentation of the sludge, and continuously increasing the potential gradient, thereby being more beneficial to the water to move towards the planar cathode.
The invention provides a horizontally-arranged cathode vacuum electroosmosis sludge dewatering device and method, which have the following beneficial effects:
(1) in the prior art, electrodes are generally vertically arranged, and the blocking effect of longitudinal cracks in sludge on current is obvious in the sludge dehydration process;
(2) in the prior art, when the electrodes are vertically inserted into the sludge, the vacuum sealing film on the surface of the sludge is easy to puncture, but the electrodes are horizontally arranged in the invention, so that the vacuum sealing film is difficult to puncture;
In addition, the sludge on the upper part of the filter pipe network can isolate air from the filter pipe network at the bottom of the sludge tank, so that a vacuum sealing film does not need to be paved on the surface of the sludge, the engineering quantity is reduced, and the cost is reduced;
(3) the water content of the sludge at the bottom of the river channel is extremely high, the sludge is greatly settled after water is drained, the position of the anode is reduced along with the settlement of the sludge, the distance between the anode and the cathode is continuously reduced, the potential gradient between the anode and the cathode is continuously increased, and the water is favorably transported to the cathode;
(4) according to the invention, the filter pipe network and the planar cathode are sequentially arranged at the bottom of the sludge tank from bottom to top, and the planar anode is laid on the surface of the sludge in the sludge tank, so that a gravitational field and an electric field can be fully and effectively utilized, and water in the sludge is separated from the sludge under the combined action of the electric field and the gravitational field.
Drawings
FIG. 1 is a block diagram of a horizontally arranged cathode vacuum electro-osmotic sludge dewatering device provided by the present invention;
FIG. 2 is a cross-sectional view of a horizontally disposed cathodic vacuum electroosmotic sludge dewatering device;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
in the figure: 1-a sludge tank; 2-a filter pipe network; 210-a filter tube; 211-a filter layer; 212-a drainage channel; 220-sealing cover; 3-a planar cathode; 310-reinforcing steel bars; 4-a planar anode; 5-a direct current power supply; 6-a water-gas separation device; 7-vacuum pump.
Detailed Description
the invention is described in further detail with reference to the figures and specific embodiments.
A cathode vacuum electroosmosis sludge dewatering device arranged horizontally comprises a sludge tank 1, a filter pipe network 2 is horizontally laid in the sludge tank 1, a planar cathode 3 is flatly laid above the filter pipe network 2 in a manner of clinging to the ground, the planar cathode 3 and the filter pipe network 2 are both embedded into sludge in the sludge tank 1, a planar anode 4 is arranged on the upper surface of the sludge in the sludge tank 1, the planar anode 4 is parallel to and correspondingly arranged with two planes of the planar cathode 3, the planar anode 4 is electrically connected with an anode of a direct-current power supply 5, and the planar cathode 3 is electrically connected with a cathode of the direct-current power supply 5; and a water-gas separation device 6 is arranged on the edge of the sludge tank 1, one end of the water-gas separation device 6 is communicated with a vacuum pump 7, and the other end of the water-gas separation device 6 is communicated with the filter pipe network 2.
In this embodiment, the planar cathode 3 comprises a plurality of parallel arranged steel bars 310, the steel bars 310 being laid snugly over the filter tubes 210 of the filter network 2.
In this embodiment, the planar anode 4 is a steel wire mesh.
in this embodiment, the water-gas separating device 6 is a water-gas separating tank, water and gas sucked out from the filter pipe network by a vacuum pump stay in the water-gas separating tank, then the gas is pumped out by the vacuum pump, and the water entrained in the gas is temporarily stored in the water-gas separating tank.
In the present embodiment, the filter tubes 210 in the filter tube network 2 include an outer filter layer 211 and a drainage passage 212 communicating the filter layer 211 with the interior of the filter tubes.
in this embodiment, the end of the filter tube 210 in the filter tube network 2 contacting the sludge is provided with a sealing cap 220, and the sealing cap 220 is used for sealing the end of the filter tube 210 to prevent the sludge from entering the filter tube.
Of course, in other embodiments, the above structure may take other forms and fall within the scope of the present invention.
a horizontally arranged cathode vacuum electroosmotic sludge dewatering method is based on the horizontally arranged cathode vacuum electroosmotic sludge dewatering device and comprises the following steps:
(1) Building a sludge pond near or at a designated position of a river section involved in the engineering;
(2) splicing the filter pipes into a filter pipe network according to the size of the sludge tank, and horizontally paving the filter pipe network at the bottom of the sludge tank;
(3) arranging the steel bars in the planar cathode and the filter tubes in the filter tube network correspondingly, ensuring that at least one filter tube is arranged below the steel bars in the planar cathode, and fixing; the steel bar in the plane cathode is electrically connected with the negative pole of the direct current power supply by a lead;
(4) stacking the cleared sludge in a sludge tank, and burying a planar cathode and a filter pipe network in the sludge tank into the sludge;
(5) laying a planar anode on the surface of sludge in the sludge tank, and electrically connecting the planar anode and the anode of the direct-current power supply by using a lead;
(6) And starting the vacuum pump, starting the direct-current power supply, dehydrating the sludge, continuously reducing the distance between the planar anode and the planar cathode along with the continuous sedimentation of the sludge, and continuously increasing the potential gradient, thereby being more beneficial to the water to move towards the planar cathode.
The above-described embodiments are intended to illustrate the present invention, but not to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit of the present invention and the scope of the claims fall within the scope of the present invention.
Claims (7)
1. the horizontally arranged cathode vacuum electroosmosis sludge dewatering device is characterized by comprising a sludge tank, wherein a filter pipe network is horizontally laid in the sludge tank, a planar cathode is flatly laid above the filter pipe network in a manner of clinging to the ground, the planar cathode and the filter pipe network are both embedded into sludge in the sludge tank, a planar anode is arranged on the upper surface of the sludge in the sludge tank, the planar anode and the two planes of the planar cathode are arranged in parallel and correspondingly, the planar anode is electrically connected with a positive electrode of a direct-current power supply, and the planar cathode is electrically connected with a negative electrode of the direct-current power supply; and a water-gas separation device is arranged on the edge of the sludge tank, one end of the water-gas separation device is communicated with the vacuum pump, and the other end of the water-gas separation device is communicated with the filter pipe network.
2. The horizontally arranged cathode vacuum electro-osmotic sludge dewatering apparatus according to claim 1, wherein the planar cathode comprises a plurality of parallel arranged steel bars, the steel bars being laid snugly over the filter tubes of the filter screen network.
3. the horizontally arranged cathode vacuum electro-osmotic sludge dewatering apparatus according to claim 1, wherein the planar anode is a steel mesh.
4. The horizontally arranged cathode vacuum electro-osmotic sludge dewatering apparatus according to claim 1, wherein the water-gas separation device is a water-gas separation tank.
5. the horizontally arranged cathode vacuum electro-osmotic sludge dewatering apparatus according to claim 1, wherein the filter tubes in the filter tube network include an outer filter layer and a drainage channel communicating the filter layer with the interior of the filter tubes.
6. the horizontally arranged cathode vacuum electro-osmotic sludge dewatering apparatus according to claim 1, wherein the ends of the filter tubes in the filter tube network that contact the sludge are provided with a sealing cap.
7. A horizontally arranged cathode vacuum electroosmotic sludge dewatering method, characterized in that it is based on the horizontally arranged cathode vacuum electroosmotic sludge dewatering device of claim 1 and comprises the steps of:
(1) Building a sludge pond near or at a designated position of a river section involved in the engineering;
(2) Splicing the filter pipes into a filter pipe network according to the size of the sludge tank, and horizontally paving the filter pipe network at the bottom of the sludge tank;
(3) Arranging the steel bars in the planar cathode and the filter tubes in the filter tube network correspondingly, ensuring that at least one filter tube is arranged below the steel bars in the planar cathode, and fixing; the steel bar in the plane cathode is electrically connected with the negative pole of the direct current power supply by a lead;
(4) stacking the cleared sludge in a sludge tank, and burying a planar cathode and a filter pipe network in the sludge tank into the sludge;
(5) laying a planar anode on the surface of sludge in the sludge tank, and electrically connecting the planar anode and the anode of the direct-current power supply by using a lead;
(6) And starting the vacuum pump, starting the direct-current power supply, dehydrating the sludge, continuously reducing the distance between the planar anode and the planar cathode along with the continuous sedimentation of the sludge, and continuously increasing the potential gradient, thereby being more beneficial to the water to move towards the planar cathode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910846933.5A CN110550848A (en) | 2019-09-09 | 2019-09-09 | Horizontal-arranged cathode vacuum electroosmosis sludge dewatering device and method |
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| CN201910846933.5A CN110550848A (en) | 2019-09-09 | 2019-09-09 | Horizontal-arranged cathode vacuum electroosmosis sludge dewatering device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111809605A (en) * | 2020-04-14 | 2020-10-23 | 温州市铁路与轨道交通投资集团有限公司 | Horizontal drainage plate-vacuum preloading combined electroosmosis system and sludge treatment method thereof |
| CN113529691A (en) * | 2021-07-06 | 2021-10-22 | 江苏科技大学 | Device for solidifying river sludge on site and construction method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111809605A (en) * | 2020-04-14 | 2020-10-23 | 温州市铁路与轨道交通投资集团有限公司 | Horizontal drainage plate-vacuum preloading combined electroosmosis system and sludge treatment method thereof |
| CN111809605B (en) * | 2020-04-14 | 2022-01-07 | 温州市铁路与轨道交通投资集团有限公司 | Horizontal drainage plate-vacuum preloading combined electroosmosis system and sludge treatment method thereof |
| CN113529691A (en) * | 2021-07-06 | 2021-10-22 | 江苏科技大学 | Device for solidifying river sludge on site and construction method |
| CN113529691B (en) * | 2021-07-06 | 2022-05-10 | 江苏科技大学 | Device for solidifying river sludge on site and construction method |
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Application publication date: 20191210 |