CN109422442B - Sludge dewatering container and dewatering method using same - Google Patents
Sludge dewatering container and dewatering method using same Download PDFInfo
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- CN109422442B CN109422442B CN201710763611.5A CN201710763611A CN109422442B CN 109422442 B CN109422442 B CN 109422442B CN 201710763611 A CN201710763611 A CN 201710763611A CN 109422442 B CN109422442 B CN 109422442B
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- dewatering
- electrode material
- dehydration
- conductivity
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- 239000010802 sludge Substances 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000007772 electrode material Substances 0.000 claims abstract description 49
- 230000018044 dehydration Effects 0.000 claims abstract description 45
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 239000003513 alkali Substances 0.000 claims abstract description 25
- 238000005370 electroosmosis Methods 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- 238000003825 pressing Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 230000007306 turnover Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 15
- 239000012670 alkaline solution Substances 0.000 abstract description 2
- 208000005156 Dehydration Diseases 0.000 description 37
- 239000000243 solution Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
-
- 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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
- C02F2201/46125—Electrical variables
- C02F2201/4614—Current
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sludge dewatering container and a dewatering method using the same, the sludge dewatering container comprises an insulating container body, the insulating container body comprises a container side wall, a bottom, a top and electrode materials respectively arranged on the bottom and the top, the two electrode materials are respectively arranged in an upper-positive-lower-negative manner, an alkali adding device is further arranged on the insulating container body, the alkali adding device comprises a detection unit for detecting the conductivity of sludge and a liquid outlet for supplying liquid to the electrode materials on the top, the liquid supply of the liquid outlet is controlled by the detection unit, and when the conductivity of the sludge is reduced by a preset value A, the liquid outlet is opened for liquid supply. The alkaline adding device is introduced, the conductivity of the sludge is detected through the detection unit, namely, after electroosmosis is carried out for a period of time, the conductivity of the sludge is reduced, and at the moment, a point of alkaline solution is added on the electrode material at the top, so that the conductivity of the sludge and the electroosmosis dehydration effect can be effectively improved.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a sludge dewatering container and a dewatering method using the same.
Background
Dewatering sludge, and converting the original, concentrated or digested sludge in fluid state into semi-solid or solid sludge block. The sludge produced by sewage treatment has higher water content, and due to the characteristic of combining the water with sludge particles, the mechanical method is adopted to remove the sludge, so that the organic matter content, ash content and especially the addition amount of flocculant in the sludge have important influence on the final solid content. In general, a solids content of 20% -30% can be obtained by mechanical dewatering, and the sludge formed is also called a mud cake.
However, the difficulty and cost of extrusion dewatering are high, and for some difficult sludge, the water content of the sludge after forming a mud cake is still high, and further dewatering treatment such as heat drying and the like are required.
The Chinese patent with the authority bulletin number of CN101224943 and the application date of 2008, 2 and 1, discloses a container type electroosmosis silt soil reconstruction method, which adopts a container as a silt treatment carrier to carry out electroosmosis dehydration, and then a vacuum drainage device, a vacuum pre-pressing device and a static load device can be additionally arranged according to the requirement to assist the electroosmosis dehydration, so that the dehydration efficiency is improved; the structure of the container can be provided with various structures, and the electrodes of the electroosmosis device also have various arrangement modes (such as a middle-negative wall-positive type, an upper-negative-lower-positive type and the like), so that a novel dehydration treatment mode is provided, namely, the electroosmosis is adopted to carry out dehydration treatment on the sludge. It has better sludge dewatering effect, but in use, the dewatering effect on the sludge in the electroosmosis process is found to be gradually reduced, so that the sludge dewatering efficiency is reduced.
Disclosure of Invention
The invention aims to provide a sludge dewatering container which has the effect of improving the sludge dewatering efficiency.
The technical purpose of the invention is realized by the following technical scheme:
the utility model provides a sludge dewatering container, includes the insulating container body, the insulating container body includes container lateral wall, bottom, top and locates the electrode material on bottom and the top respectively, still be provided with on the insulating container body and add alkali device, add alkali device including the detecting element that is used for detecting mud conductivity and the liquid outlet to the electrode material feed liquid at top, the feed liquid of liquid outlet is controlled by detecting element, and the liquid outlet is opened and is supplied the liquid when the electric conductivity of preset value A is reduced to the mud.
So set up, when using electrode material at top and electrode material at low portion to carry out the electro-osmosis to mud, introduce and add alkali device, detect the conductivity of mud through detecting element, promptly after the electro-osmosis is a period, the nearby earth of electrode material at top and electrode material at top can dry, causes mud conductivity to descend, and appropriate addition a bit alkaline solution on electrode material at top this moment can effectual improvement conductive effect to this guarantees the conductivity of mud and the dehydration effect of electro-osmosis.
Further preferred are: the two electrode materials are connected to an intermittent power supply device, and the intermittent power supply device is powered off for 1-4h every 8-15 h.
Although the setting of the alkali adding device can improve the electric conductivity and improve the dehydration efficiency, the phenomenon that the electric conductivity is reduced due to the accumulation of electric charges inevitably occurs, namely the electric conductivity is still continuously reduced, and the reduction speed is faster and faster along with the increase of the electrifying time, therefore, the intermittent power-on and power-off is adopted for the sludge dehydration container by using the intermittent power supply device, so that the sludge dehydration container is powered off for 1-4 hours after 8-12 hours of electrifying to eliminate the accumulation phenomenon of electric charges, in addition, while the electroosmosis is stopped during the power-off, a certain inertia effect exists in the power-off time within 1-4 hours, namely the dehydration effect is far better than the dehydration in the power-off time without the electrifying, the effect gradually disappears after 1-4 hours, and the specific duration depends on the water content of the sludge.
Further preferred are: the electrode material at the top is connected to the top in a sliding manner along the vertical direction, and the top is provided with a pressing device for keeping the electrode material at the top in contact with sludge in the dehydration container.
So set up, keep the electrode material at top and the contact of mud through pushing down the device, avoid the mud volume to break away from with the electrode material at top after reducing in the dehydration process to this guarantees that mud is continuous to be electrified.
Further preferred are: the pressing device comprises a balancing weight and a force application part for applying pressure to the balancing weight, the opening and closing of the force application part is controlled by the conductivity of sludge between the electrode material at the top and the electrode material at the lower part, and when the conductivity of the sludge is lower than a preset value B, the force application part is started to apply pressure to the balancing weight.
In addition, the force application part is combined to apply pressure to the balancing weight, an extrusion effect is generated on the sludge, dehydration is enhanced, the whole electroosmosis process is applied with pressure, the energy consumption is overlarge, the compression of a gap in the sludge is caused, the water flow speed is reduced during electroosmosis dehydration, the preset value B is set, and the force application part is started to apply pressure when the electroosmosis dehydration effect is reduced, so that the whole dehydration efficiency is improved, and the energy consumption is reduced.
Further preferred are: the force application part is a pneumatic cylinder or a lifting rod driven by a rotating motor, and the pressure of the force application part acting on the balancing weight is gradually increased.
So set up, drive through pneumatic cylinder or rotating motor, avoid the too big direct mud compaction of pressure, lead to the fact in the mud water gap too little, influence electroosmosis effect, adopt the incrementally applied pressure, compensate electroosmosis effect decline, reduce the influence to electroosmosis dehydration effect, improve holistic dehydration rate.
Further preferred are: the detection unit is a water content sensor inserted in the sludge or an ammeter sensor arranged in series with the dehydration container.
The water content in the sludge is inversely proportional to the resistance, namely, the higher the water content is, the smaller the resistance is, the larger the current is, and the better the conductivity is, so that the conductivity can be directly obtained by detecting the water content; in addition, the current magnitude directly reflects the conductivity magnitude, so the current sensor can also be used for detection.
Further preferred are: the top of the insulating container body is provided with a mud inlet, the top is a turnover top cover or a piston type top cover capable of closing the mud inlet, and the electrode material at the top is arranged on the top cover.
So set up, advance mud mouth and locate the top in being convenient for add the dehydration container with mud, and when the top cap can be realized opening to convertible or piston formula top cap, realize the setting of balancing weight and application of force spare.
Further preferred are: the bottom of the insulating container body is provided with a mud outlet, the bottom is a turnover bottom cover or a rotary bottom cover capable of closing the mud outlet, a filter screen and a water containing cavity with a water outlet are arranged on the bottom cover, and electrode materials at the lower part are arranged on the bottom cover.
By the arrangement, water removed from the sludge can be discharged from the low end, and meanwhile, the sludge can be discharged through the low end, so that the sludge can be discharged conveniently.
The second object of the present invention is to provide a dewatering method using a sludge dewatering vessel.
The technical purpose of the invention is realized by the following technical scheme:
the dehydration method adopting the sludge dehydration container comprises the following steps:
s1, filling, namely sealing a sludge outlet of a sludge dewatering container, adding sludge into the sludge dewatering container from the sludge inlet, and sealing the sludge inlet by using a top cover after filling;
s2, electrifying and dehydrating, wherein an electrode material on the top of the top cover is connected with the positive electrode of the intermittent power supply device, an electrode material on the bottom cover is connected with the negative electrode of the intermittent power supply device, and the intermittent power supply device is started to electrify the sludge dehydration container for 8-12h at 10-120V, so that water in sludge moves to the negative electrode, passes through the filter screen, enters the water containing cavity on the bottom cover and is discharged through the water outlet; wherein, the electrode material at the top descends along with the dehydration and compression of the sludge under the action of a pressing device in the electrifying process, and keeps in contact with the sludge;
s3, adding alkali, wherein in the electrifying process of the step S2, the resistivity in the sludge is measured through a water content sensor or the current is measured through an ammeter sensor, and when the electric conductivity of the sludge is detected to be reduced by a preset value A, the alkali adding device starts to open a liquid outlet to drop an alkali solution onto the electrode material at the top, wherein the preset value A is 10% -30% of the initial electric conductivity;
s4, power-off dehydration, and power-off for 1-4 hours after 8-12 hours of power-on;
s5, deep dehydration, and repeating the steps of S2-S4 for 1-4 times;
s6, cleaning, namely opening the bottom cover after sludge dewatering is completed, and continuously pressing the sludge by the pressing device to discharge the sludge from the sludge outlet below.
Further preferred are: in the step S4, the power is cut off, and meanwhile, a force application part is started to apply pressure to the balancing weight, the pressure is increased in an incremental mode, and the pressure is kept at 50-800Kpa/cm after the pressure reaches the maximum 2 Is a pressure of the pressure sensor.
The preset value B is set to be the conductivity when electroosmosis is stopped, so that electroosmosis and filter pressing alternate action is realized, and the integral dehydration effect is improved while the energy consumption and electroosmosis dehydration efficiency are reduced.
In summary, the invention has the following beneficial effects: in the electroosmosis process, the drop of the conductivity is slowed down by dripping alkali liquor, the effective electroosmosis duration is prolonged, in addition, the polarization phenomenon is eliminated by skillfully combining the on-off and alkali adding device, the conductivity of the sludge is recovered to a certain extent, and the overall sludge dewatering efficiency is effectively improved by skillfully combining the pressing device with the on-off time.
Drawings
Fig. 1 is a schematic structural view of the present embodiment;
fig. 2 is a schematic view of the structure of the present embodiment with the top cover and the bottom cover opened;
fig. 3 is an enlarged view of a portion a of fig. 2;
FIG. 4 is a schematic diagram of the alkali adding device in the present embodiment;
FIG. 5 is a schematic diagram of the alkali adding device in the second embodiment.
1. A rim container body; 11. a mud outlet; 12. a mud inlet; 2. a top cover; 21. a connecting column; 3. a bottom cover; 31. a water containing cavity; 32. a filter screen; 33. a grip portion; 34. a water outlet; 4. an electrode material; 5. a telescopic cylinder; 6. lifting a cylinder; 7. an alkali adding device; 71. a solution chamber; 72. a detection unit; 73. a liquid outlet; 74. a plug; 741. a baffle; 75. a control mechanism; 751. a reset member; 752. pushing and pressing the turntable; 7521. a protrusion; 753. a driving motor; 76. a transmission gear.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications which do not creatively contribute to the present embodiment can be made by those skilled in the art after reading the present specification as required, but are protected by patent laws within the protection scope of the present invention.
Example 1: the utility model provides a sludge dewatering container, as shown in fig. 1, including insulating container body 1, insulating container body 1 is cube structure (wherein, not limited to the cube, can be cylindrical, cuboid etc.), insulating container body 1 is including container lateral wall, bottom, top and locate respectively the two electrode material 4 on bottom and the top, two electrode material 4 are connected with positive pole, the negative pole of power and are formed two kinds of situations of going up the negative pole down or going up the negative pole down, wherein, go up the negative pole down the positive and be used for flocculating mud, go up the positive lower negative pole and be used for carrying out the degree of depth dehydration to the mud after the flocculation.
As shown in fig. 1 and 2, the bottom of the insulating container body 1 is provided with a mud outlet 11 in an opening manner, the bottom is a turnover bottom cover 3 capable of closing the mud outlet 11, one side edge of the bottom cover 3 is hinged to the bottom of the side wall of the container, a telescopic cylinder 5 for controlling the turnover of the bottom cover 3 is connected between the bottom cover 3 and the side wall of the container, one end of the telescopic cylinder 5 is rotatably connected to the side wall of the container, the other end of the telescopic cylinder 5 is rotatably connected to the bottom cover 3, and the rotation of the bottom cover 3 is driven by the telescopic operation of the control cylinder, so that the opening and closing of the mud outlet 11 are controlled.
Wherein, be provided with the sealing washer in the bottom of insulating container body 1 and be used for guaranteeing the leakproofness after bottom 3 seals mud inlet 12.
Referring to fig. 2 and 3, a filter screen 32 and a water containing cavity 31 are disposed on the bottom cover 3, the water containing cavity 31 is communicated with the inside of the insulating container body 1, the filter screen 32 is located between the water containing cavity 31 and the insulating container body 1, water in sludge enters the water containing cavity 31 after being filtered by the filter screen 32, a water outlet 34 penetrating through the side wall of the bottom cover 3 is disposed on the water containing cavity 31, and the water outlet 34 is communicated with a pipeline to discharge water. Wherein the electrode material 4 on the bottom is provided on the bottom cover 3 and is mounted above the filter screen 32.
Referring to fig. 2, a mud inlet 12 is formed at the top of an insulation container body 1 in an opening manner, mud can be filled through pipeline introduction or manual filling, a piston type top cover 2 capable of sealing the mud inlet 12 is arranged at the top, and a pressing device is further arranged on the dehydration container for keeping electrode materials 4 on the top cover 2 in contact with the mud.
The pushing device comprises a balancing weight and a force application member, in this embodiment, the balancing weight is a top cover 2 made of an insulating material, and an electrode material 4 positioned at the top is arranged on the end face of the bottom end of the balancing weight.
Wherein, the top of the top cover 2 is also provided with a vertically arranged lifting cylinder 6 for controlling the lifting and lowering of the top cover 2, the top end face of the balancing weight is provided with a connecting column 21, the piston rod of the lifting cylinder 6 is inserted on the connecting column 21 and forms a telescopic rod structure with the connecting column 21, wherein, the lifting cylinder 6 is the force application part when pushing the balancing weight to press down. The force application part is started to be closed and started to apply pressure to the balancing weight when the conductivity of the sludge is lower than a preset value B and the pressure applied to the balancing weight by the force application part is gradually increased.
As shown in fig. 4 and 5, an alkali adding device 7 is arranged on the balancing weight, the alkali adding device 7 comprises a solution cavity 71, a detection unit 72 and a liquid outlet 73, the solution cavity 71 is arranged above the balancing weight and is used for storing alkali liquor, the detection unit 72 is a water content sensor inserted into sludge, the water content sensor is fixed on the balancing weight, and the protruding electrode material 4 is 1-2 cm, so that the water content sensor is inserted into the sludge in use. The liquid outlet 73 penetrates through the balancing weight, an anti-blocking gate capable of blocking the liquid outlet 73 and keeping the end face of the bottom end of the balancing weight smooth is arranged on the liquid outlet 73, and the anti-blocking gate is controlled by the detection unit 72 to control the liquid outlet 73 to be opened and closed.
The anti-blocking gate comprises a plug 74 and a control mechanism 75, the plug 74 is inserted on the liquid outlet 73, the liquid outlet 73 is divided into two parts with a big upper part and a small lower part, and the diameter of the plug 74 is matched with a section with a small diameter below the liquid outlet 73. The control mechanism 75 includes a restoring member 751, a pushing turntable 752 and a driving member, the restoring member 751 is a compression spring sleeved on the plug 74, a blocking piece 741 is arranged at the top of the plug 74, and two ends of the compression spring are respectively abutted against the balancing weight and the blocking piece 741.
The cross section of the connecting column 21 is cylindrical, the pushing turntable 752 is rotatably connected to the connecting column 21 and is provided with an external gear, a plurality of protrusions 7521 for pressing the plugs 74 to close the liquid outlet 73 are arranged on one end face of the pushing turntable 752, which faces the plugs 74, the protrusions 7521 are arranged around the axis of the pushing turntable 752 in a circle, the pushing turntable 752 is in a wave-shaped structure, the top of the plugs 74 is arc-shaped, and the plugs 74 do reciprocating lifting motion in the rotating process of the pushing turntable 752.
The driving member is a driving motor 753, the driving motor 753 is meshed with the pushing turntable 752 through a transmission gear 76 to drive the pushing turntable 752 to rotate, and the rotation of the driving member is controlled by the detecting unit 72.
The two electrode materials 4 on the dehydration vessel are connected to an intermittent power supply device through which intermittent power is supplied.
Example 2: a dehydration method of a dehydration vessel comprising the steps of:
s1, filling, namely sealing a sludge outlet 11 of a sludge dewatering container, adding sludge into the sludge dewatering container from a sludge inlet 12, and sealing the sludge outlet 11 by using a top cover 2 after filling;
s2, electrifying and dehydrating, controlling the lifting air cylinder 6 to continue to stretch so that the balancing weight is in conflict with the sludge, at the moment, continuously controlling the lifting air cylinder 6 to stretch so that the telescopic rod is contracted, and relieving the tension of the lifting air cylinder 6 to the balancing weight.
The electrode material 4 on the top cover 2 is connected with the positive electrode of the intermittent power supply device, the electrode material 4 on the bottom cover 3 is connected with the negative electrode of the intermittent power supply device, the intermittent power supply device is started to electrify the sludge dewatering container for 10h with the voltage of 80V, so that the water in the sludge moves to the negative electrode, passes through the filter screen 32, enters the water containing cavity 31 on the bottom cover 3, and is discharged through the water outlet 34; wherein, the electrode material 4 at the top descends along with the dehydration and compression of the sludge under the action of a pressing device in the electrifying process, and keeps in contact with the sludge;
s3, adding alkali, wherein in the electrifying process of the step S2, the resistivity in the sludge is measured through a water content sensor or the current is measured through an ammeter sensor, and when the conductivity of the sludge is detected to be reduced by a preset value A, the alkali adding device 7 starts to open a liquid outlet 73 to drop alkali solution onto the electrode material 4 at the top, wherein the preset value A is 20% of the initial conductivity;
s4, power-off dehydration, namely power-off for 3 hours after 10 hours of power-on, and power-off simultaneouslyStarting the force application part to apply pressure to the balancing weight, increasing the pressure incrementally, and keeping at 800Kpa/cm when the pressure reaches the maximum 2 Is a pressure of (2);
s5, deep dehydration, and repeating the steps S2-S4 for 3 times;
s6, cleaning, namely opening the bottom cover 3 after sludge dewatering is completed, and continuously pressing the sludge by the pressing device to discharge the sludge from the sludge outlet 11 below.
Claims (10)
1. A method for dewatering sludge, comprising the steps of:
s1, filling, namely sealing a sludge outlet (11) of a sludge dewatering container, adding sludge into the sludge dewatering container from a sludge inlet (12), and sealing the sludge inlet (12) by using a top cover (2) after filling;
s2, electrifying and dehydrating, wherein an electrode material (4) on a top cover (2) is connected with the positive electrode of the intermittent power supply device, an electrode material (4) on the bottom of a bottom cover (3) is connected with the negative electrode of the intermittent power supply device, and the intermittent power supply device is started to electrify a sludge dehydration container for 8-12h at a voltage of 10-120V, so that water in sludge moves to the negative electrode, passes through a filter screen (32) and enters a water containing cavity (31) on the bottom cover (3) and is discharged through a water outlet (34); wherein, the electrode material (4) at the top descends along with the dehydration and compression of the sludge under the action of a pressing device in the electrifying process, and keeps contact with the sludge;
s3, adding alkali, wherein in the electrifying process of the step S2, the resistivity in the sludge is measured through a water content sensor or the current is measured through an ammeter sensor, and when the electric conductivity of the sludge is detected to be reduced by a preset value A, an alkali adding device (7) starts to open a liquid outlet (73) to drop an alkali solution onto an electrode material (4) at the top, wherein the preset value A is 10% -30% of the initial electric conductivity;
s4, power-off dehydration, and power-off for 1-4 hours after 8-12 hours of power-on;
s5, deep dehydration, and repeating the steps of S2-S4 for 1-4 times;
s6, cleaning, namely opening the bottom cover (3) after sludge dewatering is completed, and continuously pressing the sludge by the pressing device to discharge the sludge from the sludge outlet (11) below.
2. Sludge according to claim 1The dehydration method is characterized in that: in the step S4, the power is cut off, and meanwhile, a force application part is started to apply pressure to the balancing weight, the pressure is increased in an incremental mode, and the pressure is kept at 50-800Kpa/cm after the pressure reaches the maximum 2 Is a pressure of the pressure sensor.
3. The sludge dewatering method according to claim 1 or 2, characterized in that: the sludge dewatering container that sludge dewatering method adopted includes insulating container body (1), insulating container body (1) include container lateral wall, bottom, top and locate electrode material (4) on bottom and the top respectively, two electrode material (4) are respectively for going up positive lower yin setting, still be provided with on insulating container body (1) and add alkali device (7), add alkali device (7) including detecting element (72) that are used for detecting the mud conductivity and liquid outlet (73) to the positive pole material feed liquid, the feed liquid of liquid outlet (73) is controlled by detecting element (72), and liquid outlet (73) are opened and are supplied liquid when the electric conductivity of preset value A is reduced to the mud each time.
4. A sludge dewatering method as claimed in claim 3, wherein: the two electrode materials (4) are connected to an intermittent power supply device, and the intermittent power supply device is powered off for 1-4 hours every 8-15 hours.
5. The method for dewatering sludge according to claim 4, wherein: the electrode material (4) at the top is connected to the top in a sliding manner along the vertical direction, and the top is provided with a pressing device for keeping the electrode material (4) at the top in contact with sludge in the dehydration container.
6. The method for dewatering sludge according to claim 5, wherein: the pushing device comprises a balancing weight and a force application part for applying pressure to the balancing weight, the opening and closing of the force application part is controlled by the conductivity of sludge between an electrode material (4) at the top and an electrode material (4) at the bottom, and when the conductivity of the sludge is lower than a preset value B, the force application part is started to apply pressure to the balancing weight, wherein the preset value B is set to be the conductivity when electroosmosis is stopped.
7. The method for dewatering sludge according to claim 6, wherein: the force application part is a pneumatic cylinder or a lifting rod driven by a rotating motor, and the pressure of the force application part acting on the balancing weight is gradually increased.
8. The method for dewatering sludge according to claim 3 or 4 or 5 or 6, characterized in that: the detection unit (72) is a water content sensor inserted in the sludge or an ammeter sensor arranged in series with the dehydration container.
9. A sludge dewatering method as claimed in claim 3, wherein: the top of the insulating container body (1) is provided with a mud inlet (12), the top is a turnover top cover (2) or a piston type top cover (2) capable of closing the mud inlet (12), and an electrode material (4) at the top is arranged on the top cover (2).
10. The sludge dewatering method as claimed in claim 3 or 4, wherein: the bottom of insulating container body (1) is provided with out mud mouth (11), the bottom is can seal out the bottom (3) or the rotary type bottom (3) of upset of mud mouth (11), be provided with filter screen (32) and be equipped with water appearance chamber (31) of delivery port (34) on bottom (3), electrode material (4) of bottom are located on bottom (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| JPS60114315A (en) * | 1983-11-26 | 1985-06-20 | Shinko Fuaudoraa Kk | Dehydrating method of organic sludge |
| CN201817307U (en) * | 2010-09-26 | 2011-05-04 | 上海交通大学 | Integral nitrogen and phosphorus removal electrolysis unit |
| CN206396038U (en) * | 2017-01-13 | 2017-08-11 | 河南工程学院 | Microwave cooperating electro-osmosis advanced oxidation deeply dehydrating sludge experimental provision |
| CN207193094U (en) * | 2017-08-30 | 2018-04-06 | 杭州渗源环境科技有限公司 | Sludge dewatering container |
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| WO2003068691A1 (en) * | 2002-02-12 | 2003-08-21 | Les Technologies Elcotech Inc. | Method for the treatment of slurries by the combined action of pressure and electro-osmosis |
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| JPS60114315A (en) * | 1983-11-26 | 1985-06-20 | Shinko Fuaudoraa Kk | Dehydrating method of organic sludge |
| CN201817307U (en) * | 2010-09-26 | 2011-05-04 | 上海交通大学 | Integral nitrogen and phosphorus removal electrolysis unit |
| CN206396038U (en) * | 2017-01-13 | 2017-08-11 | 河南工程学院 | Microwave cooperating electro-osmosis advanced oxidation deeply dehydrating sludge experimental provision |
| CN207193094U (en) * | 2017-08-30 | 2018-04-06 | 杭州渗源环境科技有限公司 | Sludge dewatering container |
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