CN113087349A - Deep dehydration method for sludge belt - Google Patents
Deep dehydration method for sludge belt Download PDFInfo
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- CN113087349A CN113087349A CN202110578698.5A CN202110578698A CN113087349A CN 113087349 A CN113087349 A CN 113087349A CN 202110578698 A CN202110578698 A CN 202110578698A CN 113087349 A CN113087349 A CN 113087349A
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- belt
- filter
- sludge
- pressure
- filter cloth
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- 239000010802 sludge Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000018044 dehydration Effects 0.000 title description 12
- 238000006297 dehydration reaction Methods 0.000 title description 12
- 239000000463 material Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000004744 fabric Substances 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 31
- 238000003825 pressing Methods 0.000 claims abstract description 15
- 238000004140 cleaning Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims 1
- 239000007787 solid Substances 0.000 abstract description 5
- 239000002002 slurry Substances 0.000 abstract description 4
- 239000003245 coal Substances 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 238000011085 pressure filtration Methods 0.000 abstract 1
- 239000012528 membrane Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000012065 filter cake Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/123—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using belt or band filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention belongs to the technical field of sludge dewatering treatment, and particularly relates to a sludge belt dewatering method which can also be used for deep dewatering of coal slime and dewatering of similar materials. The method comprises the steps of uniformly distributing the hoppers, distributing materials, hydraulically sealing, pressurizing, relieving pressure, cleaning and the like. The filter structure with the filter cloth and the belt bonded integrally has the advantages that the multi-layer belt is high in strength, good in toughness and elasticity, and capable of being well combined with the filter cloth, the compression resistance of the filter cloth is improved, and filtered water can be easily discharged through holes in the belt; three layers of elastic rubber are adopted between the pressure cavity and the material to be pressed, so that the pressure requirement of filter pressing is met; the material in a solid state can be directly subjected to pressure filtration; the traditional feeding mode of the slurry pump is changed; the filter cloth belt realizes online cleaning in the rotating process.
Description
Technical Field
The invention belongs to the technical field of sludge dewatering treatment, and particularly relates to a sludge belt dewatering method which can also be used for deep dewatering of coal slime and dewatering of similar materials.
Background
The water content of the residual sludge in the urban sewage treatment plant is up to more than 95 percent, and the water content of the sludge can be reduced to about 80 percent after the sludge is dehydrated by conventional machinery. No matter what final treatment method is adopted by the sludge, the requirement on the water content of the sludge is generally about 60 percent (or lower). Deep dewatering of sludge is an urgent task in order to properly dispose of the sludge. At present, equipment adopted by domestic sludge dewatering plants lags behind relatively, and under the background condition, efficient deep sludge dewatering equipment needs to be developed as soon as possible so as to form an efficient sludge dewatering process, and thus the difficult problem of sludge dewatering can be effectively solved.
At present, five main sludge mechanical dehydration systems are provided, namely centrifugal dehydration, screw-stacking dehydration, belt-type dehydration, plate-frame filter-pressing dehydration and diaphragm-type filter-pressing dehydration.
The centrifugal dehydrator consists of a transfer conveyor and a spiral conveyor with a hollow rotating shaft, sludge is sent into the rotating drum through the hollow rotating shaft, and is thrown into the cavity of the rotating drum immediately under the centrifugal force generated by high-speed rotation. Due to the different specific gravity, solid-liquid separation is formed. The sludge is conveyed to the conical end of the rotary drum under the pushing of the screw conveyor and is continuously discharged from the outlet; the liquid in the liquid ring layer is discharged to the outside of the rotary drum by gravity through the weir port in a continuous 'overflow' manner.
The spiral-stacked dehydrator is formed by stacking a fixed ring and a movable ring, and a spiral shaft penetrates through a filtering main body formed in the spiral-stacked dehydrator. Full dehydration is realized through gravity concentration and internal pressure effect that mud received the back pressure board to form in advancing process, and the filtrating is discharged from the filter joint that solid fixed ring and activity ring formed, and the mud cake is discharged from the end of dehydration portion.
The belt filter press is characterized in that an upper filter belt and a lower filter belt are tensioned to carry a sludge layer, the sludge layer passes through a series of rolling cylinders which are regularly arranged in an S shape, and the filtering belts form squeezing and shearing force to the sludge layer by means of the tension of the filter belts, so that capillary water in the sludge layer is squeezed out, and sludge dewatering is realized.
The plate-and-frame filter press arranges filter plates with filtrate channels and filter frames in parallel and alternately, filter cloth is clamped between each group of filter plates and filter frames, and the filter plates and the filter frames are pressed by pressing ends, so that 1 filter press chamber is formed between the filter plates. Sludge flows in from the feed inlet, water is discharged from the filtrate outlet through the filter plate, mud cakes are accumulated on filter cloth in the frame, and the mud cakes are easy to peel off after the filter plate and the filter frame are loosened.
The working principle of the diaphragm type filter press is as follows: a large amount of sludge enters the machine body through the feeding hole, water is injected into the diaphragm plate of the filter press by the pressure pump at high pressure, and the generated diaphragm tension is used for extruding the sludge, so that the dehydration effect is obtained. After the filtrate is discharged through necessary filter cloth, the remained solid is blocked by the filter cloth and further accumulated to form reliable low-water-content substances. The membrane filter press comprises a filter chamber consisting of a membrane plate and a box-type filter plate, an elastic membrane plate is arranged between the filter plate and filter cloth, after feeding is finished, the filter is treated and separated into solid and liquid in the filter chamber, then gas is introduced into the membrane plate, and the raised membrane presses the filter cake to further reduce the water content of the filter cake.
The five dehydration systems have the defects of large initial investment, high operating cost, large equipment maintenance amount and the like.
Disclosure of Invention
Aiming at the problems of the existing mechanical sludge dewatering method, the invention provides a sludge belt dewatering method. The method has the advantages of low initial investment, low operating cost, small equipment maintenance amount and the like. The apparatus comprises: the device comprises a filter cloth belt conveyor integrated conveyor, an isometric distributor, a hydraulic sealing machine, a water (oil, gas) diaphragm filter press, a stripping receiver and an online high-pressure filter cloth cleaning machine.
In order to achieve the purpose, the invention adopts the following technical scheme.
A sludge belt dewatering method comprises the following steps:
step 1, uniformly distributing 6-10 hoppers on the filter cloth belt conveyor integrated conveyor.
And 2, uniformly distributing the materials in each hopper on a belt through a constant volume feeder to finish the first material distribution process.
And 3, rotating the belt to the position of the filter press, wherein the materials correspond to the upper position and the lower position of the filter press one by one.
And 4, the hydraulic sealing frame falls down, and the material piles are sealed in the sealing frame one by one to carry out hydraulic sealing.
And 5, starting the press machine, pressurizing the material in the sealing frame, and keeping the pressure stably after the pressure reaches the set pressure.
And 6, releasing pressure of the pressure cavity, lifting the sealing frame hydraulically, rotating the belt by 6-10 material pile lengths, unloading mud cakes at the belt turning position, and collecting and transferring the mud cakes by a material-removing receiver to finish a filter pressing cycle.
And 7, rotating the belt to a water collecting tank, and cleaning by using a high-pressure water gun.
Further, the filter cloth and belt integrated conveyor in the step 1 is a belt with holes and a filter cloth bonding body, wherein the belt is uniformly distributed in holes with the diameter of 10mm, the center distance between every two holes is 18mm, and the filter cloth is plate-and-frame filter pressing standard filter cloth.
Furthermore, the tray under the filter press in the step 3 adopts a two-layer grid structure, the first layer is a square hole with the diameter of 50 multiplied by 50 mm, the thickness of the steel plate is 10mm, and the height of the steel plate is 100 mm. The second layer is a stainless steel plate with the thickness of 3 mm, the aperture of 5 mm and the equal spacing of 5 mm, and the compressive strength is more than 50 kg/square centimeter.
Further, the hydraulic sealing pressure in the step 4 is 20-25 MPa.
Further, the press in step 5 is a water, oil or gas press, preferably a water press.
Furthermore, in the step 5, three layers of sealing are adopted between the materials in the sealing frame and the pressurized water (oil and gas), and the main body is elastic rubber.
Further, the pressure is set to be 1.0-2.5MPa in the step 5.
Further, the pressure maintaining time in the step 5 is 8-10 seconds.
Compared with the prior art, the invention has the following advantages and beneficial effects.
1. The filter structure with the filter cloth and the belt bonded integrally is provided, the multi-layer belt is high in strength, good in toughness and elasticity, and capable of being well combined with the filter cloth, the compression resistance of the filter cloth is improved, and filtered water can be easily discharged through holes in the belt.
2. Three layers of elastic rubber are adopted between the water (oil and gas) pressure cavity and the pressed materials, so that the pressure requirement of filter pressing is met.
3. Can be used for directly filter-pressing materials with the water content of 50-80 percent and can be used for directly filter-pressing materials in a solid state.
4. The feeding mode of the traditional slurry pump is changed, the slurry pump needs to dilute the material again in feeding, the conveying condition of the slurry pump is achieved, and the small-handling-capacity and large-sized equipment is caused.
5. The filter cloth belt realizes online cleaning in the rotating process.
Drawings
FIG. 1 is a process flow diagram of a sludge belt dewatering method.
Description of reference numerals:
1. a cloth-belt integrated conveyor; 2. an isovolumetric distributing machine; 3. feeding a hopper; 4. material before filter pressing (75% water content); 5. a hydraulic seal cylinder; 6. hydraulic (gas, oil) cylinders; 7. material (60% water) after filter pressing; 8. a stripping receiver; 9. a water collection tank; 10. cleaning a water gun; 11. a high pressure water pump.
Detailed Description
The following describes in detail specific embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A sludge belt dewatering method comprises the following steps:
step 1, uniformly distributing 6-10 hoppers on the filter cloth belt conveyor integrated conveyor.
And 2, uniformly distributing the materials in each hopper on a belt through a constant volume feeder to finish the first material distribution process.
And 3, rotating the belt to the position of the filter press, wherein the materials correspond to the upper position and the lower position of the filter press one by one.
And 4, the hydraulic sealing frame falls down, and the material piles are sealed in the sealing frame one by one to carry out hydraulic sealing.
And 5, starting the press machine, pressurizing the material in the sealing frame, and keeping the pressure stably after the pressure reaches the set pressure.
And 6, releasing pressure of the pressure cavity, lifting the sealing frame hydraulically, rotating the belt by 6-10 material pile lengths, unloading mud cakes at the belt turning position, and collecting and transferring the mud cakes by a material-removing receiver to finish a filter pressing cycle.
And 7, rotating the belt to a water collecting tank, and cleaning by using a high-pressure water gun.
Further, the filter cloth and belt integrated conveyor in the step 1 is a belt with holes and a filter cloth bonding body, wherein the belt is uniformly distributed in holes with the diameter of 10mm, the center distance between every two holes is 18mm, and the filter cloth is plate-and-frame filter pressing standard filter cloth.
Furthermore, the tray under the filter press in the step 3 adopts a two-layer grid structure, the first layer is a square hole with the diameter of 50 multiplied by 50 mm, the thickness of the steel plate is 10mm, and the height of the steel plate is 100 mm. The second layer is a stainless steel plate with the thickness of 3 mm, the aperture of 5 mm and the equal spacing of 5 mm, and the compressive strength is more than 50 kg/square centimeter.
Further, the hydraulic sealing pressure in the step 4 is 20-25 MPa.
Further, the press in step 5 is a water, oil or gas press, preferably a water press.
Furthermore, in the step 5, three layers of sealing are adopted between the materials in the sealing frame and the pressurized water (oil and gas), and the main body is elastic rubber.
Further, the pressure is set to be 1.0-2.5MPa in the step 5.
Further, the pressure maintaining time in the step 5 is 8-10 seconds.
Example 1.
Step 1, uniformly distributing 6 hoppers on the filter cloth belt conveyor integrated conveyor.
And 2, uniformly distributing the materials in each hopper on a belt through a constant volume feeder to finish the first material distribution process.
And 3, rotating the belt to the position of the filter press, wherein the materials correspond to the upper position and the lower position of the filter press one by one.
And 4, dropping the hydraulic sealing frame, sealing the material piles in the sealing frame one by one, and performing hydraulic sealing under the pressure of 20 MPa.
And 5, starting the water press machine, pressurizing the material in the sealing frame, and stably maintaining the pressure for 10 seconds after the set pressure is 1.0 MPa.
And 6, releasing pressure of the water pressure cavity, lifting the sealing frame hydraulically, rotating the belt by the length of 6 material piles, unloading mud cakes at the folded position of the belt, and collecting and transferring the mud cakes by a material-removing receiver to finish a filter pressing cycle.
And 7, rotating the belt to a water collecting tank, and cleaning by using a high-pressure water gun.
The water content of the mud cake is 60 percent.
The equipment adopted by the invention is that the front end of the upper part of the filter cloth belt conveyor integrated conveyor is provided with a hopper and a material distributor, the rear end of the upper part is provided with a filter press, the side surface is provided with a stripping receiver, and the lower part is provided with a water collecting tank, a cleaning water gun and a high-pressure water pump.
Table 1 comparison of the different dewatering process technologies.
Claims (8)
1. A sludge belt dewatering method comprises the following steps:
step 1, uniformly distributing 6-10 hoppers on a filter cloth belt conveyor integrated conveyor;
step 2, uniformly distributing the materials in each hopper on a belt through a constant-volume feeder to finish a first material distribution process;
step 3, rotating the belt to the position of the filter press, wherein the materials correspond to the upper position and the lower position of the filter press one by one;
step 4, the hydraulic sealing frame falls down, and the material piles are sealed in the sealing frame one by one to carry out hydraulic sealing;
step 5, starting a press machine, pressurizing the material in the sealing frame, and stably maintaining the pressure after the pressure reaches a set pressure;
step 6, pressure cavity decompression, hydraulic lifting of the sealing frame, belt rotation of 6-10 material stack length positions, belt turning at the same time to unload the mud cake, and material removal receiver collection and transfer, completing a filter pressing cycle;
and 7, rotating the belt to a water collecting tank, and cleaning by using a high-pressure water gun.
2. The sludge belt dewatering method according to claim 1, wherein the filter cloth and belt integrated conveyor in step 1 is a belt with holes and a filter cloth bonding body, wherein the belt is uniformly distributed in holes with the diameter of 10mm, the center distance between the holes is 18mm, and the filter cloth is a plate-and-frame filter press standard filter cloth.
3. The sludge belt dewatering method as claimed in claim 1, wherein the tray under the filter press in step 3 is of a two-layer grid structure, the first layer is a square hole 50 x 50 mm, the thickness of the steel plate is 10mm, and the height of the steel plate is 100 mm; the second layer is a stainless steel plate with the thickness of 3 mm, the aperture of 5 mm and the equal spacing of 5 mm, and the compressive strength is more than 50 kg/square centimeter.
4. The sludge belt dewatering method of claim 1, wherein the hydraulic sealing pressure in step 4 is 20-25 MPa.
5. The sludge belt dewatering method of claim 1, wherein the press in step 5 is a water, oil or gas press, preferably a water press.
6. The sludge belt dewatering method as claimed in claim 1, wherein in step 5, three layers of seals are used between the materials in the sealing frame and the pressurized water (oil, gas), and the main body is elastic rubber.
7. The sludge belt dewatering method of claim 1, wherein the set pressure in step 5 is 1.0-2.5 MPa.
8. The sludge belt dewatering method of claim 1, wherein the hold pressure time in step 5 is 8-10 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110578698.5A CN113087349A (en) | 2021-05-26 | 2021-05-26 | Deep dehydration method for sludge belt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110578698.5A CN113087349A (en) | 2021-05-26 | 2021-05-26 | Deep dehydration method for sludge belt |
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| CN113087349A true CN113087349A (en) | 2021-07-09 |
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| CN202110578698.5A Pending CN113087349A (en) | 2021-05-26 | 2021-05-26 | Deep dehydration method for sludge belt |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114163092A (en) * | 2021-12-08 | 2022-03-11 | 深圳大学 | Sludge dewatering system and sludge dewatering method |
| CN114560613A (en) * | 2022-03-21 | 2022-05-31 | 太原市润民环保节能有限公司 | Plate frame mud pressing system and method for stabilizing water content of mud cakes |
| CN115093091A (en) * | 2022-03-18 | 2022-09-23 | 日铭电脑配件(上海)有限公司 | Industrial sewage separation device and method facilitating sludge discharge |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1329427A2 (en) * | 2002-01-22 | 2003-07-23 | Karl Kraus | Sludge dewatering device and process |
| JP2014144428A (en) * | 2013-01-29 | 2014-08-14 | Metawater Co Ltd | Sludge dehydrating system |
| CN204428942U (en) * | 2015-01-09 | 2015-07-01 | 陈苹 | A kind of sludge dewatering belt filter press |
| CN110903000A (en) * | 2019-12-25 | 2020-03-24 | 高双柱 | Sludge dewatering pressure filter for environmental protection |
| CN112607995A (en) * | 2020-12-24 | 2021-04-06 | 大地绿源环保科技(北京)有限公司 | Continuous dewatering system of mud |
-
2021
- 2021-05-26 CN CN202110578698.5A patent/CN113087349A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1329427A2 (en) * | 2002-01-22 | 2003-07-23 | Karl Kraus | Sludge dewatering device and process |
| JP2014144428A (en) * | 2013-01-29 | 2014-08-14 | Metawater Co Ltd | Sludge dehydrating system |
| CN204428942U (en) * | 2015-01-09 | 2015-07-01 | 陈苹 | A kind of sludge dewatering belt filter press |
| CN110903000A (en) * | 2019-12-25 | 2020-03-24 | 高双柱 | Sludge dewatering pressure filter for environmental protection |
| CN112607995A (en) * | 2020-12-24 | 2021-04-06 | 大地绿源环保科技(北京)有限公司 | Continuous dewatering system of mud |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114163092A (en) * | 2021-12-08 | 2022-03-11 | 深圳大学 | Sludge dewatering system and sludge dewatering method |
| CN115093091A (en) * | 2022-03-18 | 2022-09-23 | 日铭电脑配件(上海)有限公司 | Industrial sewage separation device and method facilitating sludge discharge |
| CN115093091B (en) * | 2022-03-18 | 2023-11-07 | 日铭电脑配件(上海)有限公司 | Industrial sewage separation device and method convenient for discharging sludge |
| CN114560613A (en) * | 2022-03-21 | 2022-05-31 | 太原市润民环保节能有限公司 | Plate frame mud pressing system and method for stabilizing water content of mud cakes |
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Application publication date: 20210709 |