CN112316560A - Dehydration method for treating landfill sludge by utilizing garnet and fiber under vacuum negative pressure - Google Patents
Dehydration method for treating landfill sludge by utilizing garnet and fiber under vacuum negative pressure Download PDFInfo
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- CN112316560A CN112316560A CN202011002641.2A CN202011002641A CN112316560A CN 112316560 A CN112316560 A CN 112316560A CN 202011002641 A CN202011002641 A CN 202011002641A CN 112316560 A CN112316560 A CN 112316560A
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- sludge
- filter plate
- garnet
- composite filter
- landfill
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- 239000010802 sludge Substances 0.000 title claims abstract description 60
- 239000002223 garnet Substances 0.000 title claims abstract description 31
- 239000000835 fiber Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000018044 dehydration Effects 0.000 title claims description 14
- 238000006297 dehydration reaction Methods 0.000 title claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000002131 composite material Substances 0.000 claims abstract description 27
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000003381 stabilizer Substances 0.000 claims description 6
- 229920000742 Cotton Polymers 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 239000003344 environmental pollutant Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 231100000719 pollutant Toxicity 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 239000004579 marble Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 239000002585 base Substances 0.000 claims description 2
- 239000011230 binding agent Substances 0.000 claims description 2
- 238000013329 compounding Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims description 2
- 239000010419 fine particle Substances 0.000 abstract description 2
- 231100000614 poison Toxicity 0.000 abstract description 2
- 239000003440 toxic substance Substances 0.000 abstract description 2
- 208000005156 Dehydration Diseases 0.000 description 12
- 238000002386 leaching Methods 0.000 description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 229910052802 copper Inorganic materials 0.000 description 10
- 239000010949 copper Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 5
- 238000003828 vacuum filtration Methods 0.000 description 5
- 230000007774 longterm Effects 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 231100000419 toxicity Toxicity 0.000 description 4
- 230000001988 toxicity Effects 0.000 description 4
- 239000008187 granular material Substances 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 239000002920 hazardous waste Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005067 remediation Methods 0.000 description 2
- 238000003809 water extraction Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 240000004282 Grewia occidentalis Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1615—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of natural origin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2068—Other inorganic materials, e.g. ceramics
- B01D39/2072—Other inorganic materials, e.g. ceramics the material being particulate or granular
-
- 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
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Geology (AREA)
- Treatment Of Sludge (AREA)
Abstract
According to the invention, the garnet and fiber composite material is used for treating the high-water-content landfill sludge, the composite material filter plate is firstly manufactured, the landfill sludge is placed on the base, the filter plate covers the surface of the landfill sludge, the vacuum pump is used for carrying out vacuum pumping treatment on the water content in the water-containing sludge, fine particles in the sludge can be blocked by the filter plate formed by the composite material, and water molecules pass through the filter plate, so that the treatment cost of subsequent water treatment is greatly reduced, no toxic substances are separated out in the process, and no secondary pollution is generated.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a method for treating landfill sludge by using garnet and fiber composite materials under vacuum negative pressure.
Background
From the current situation of sludge treatment in China, in recent years, in the field of water treatment, domestic environmental protection works have remarkable effect, and the total amount and treatment rate of sewage treatment are rapidly improved. Meanwhile, the process route determines that most of pollutants are transferred into the sludge, and if the sludge treatment link is not strictly controlled, the investment of billions of yuan of sewage treatment in China is only transferred in pollution. At present, over 80% of domestic sludge is not safely treated and flows into the environment, and the sludge problem becomes a bottleneck restricting the development of the sewage industry.
By analyzing the current situation of sludge treatment in China, sanitary landfill of sludge is a treatment method generally adopted in China at present in various sludge treatment modes. However, due to the high water content of the dewatered sludge and the requirement of the landfill site on the shearing force of the sludge, the requirement of the landfill site on the entering of the sludge is higher and higher. In addition, the sludge landfill not only seriously jeopardizes the safety of the landfill, but also seriously pollutes the nearby ecological environment.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for dewatering sludge in a landfill by vacuum negative pressure treatment using garnet.
The invention provides a composite filter plate, which is characterized in that: is made by compounding garnet and fiber;
wherein the mass ratio of the garnet to the fiber is 1: 0.5-1.5;
most preferably, the garnet and the fibers have a volume ratio of 1: 1.
further, the composite filter plate provided by the invention is characterized in that:
the garnet is a garnet crushed particle after grinding treatment;
the average particle diameter of the garnet fragments is 1cm or less. Crushed stone having a particle size of about 1cm is preferably used.
The particle shape of the garnet material is a corner dodecahedron or a four-corner trioctahedron, and the garnet material is multi-corner and sharp. And traditional quartz sand filter material granule is oval, and long-term water washing can make quartz sand filter material granule become more and less, and the porosity of granule diminishes, and the speed that water passes through slows down, and the filter effect worsens, so the garnet effect of chooseing for use can be better to can make the filter dehydration effect more outstanding through adding fibrous material.
Further, the composite filter plate provided by the invention is characterized in that:
the fiber is selected from plant fiber.
Preferably, the fibers are selected from fibers having acid and alkali resistance properties;
the cotton fiber is optimally selected, has low price, is easy to obtain, and has good acid and alkali resistance.
Further, the composite filter plate provided by the invention is characterized in that: the specific manufacturing method is as follows:
step one, garnet and fiber are uniformly mixed, and then an adhesive is added for shaping to manufacture a plate with a specified thickness;
and step two, maintaining the filter plate for at least 1 day.
Further, the composite filter plate provided by the invention is characterized in that:
the binder is used in an amount of 1-5% by weight based on the combined weight of the garnet and the fiber.
Further, the composite filter plate provided by the invention is characterized in that:
the adhesive is selected from marble glue.
Further, the composite filter plate provided by the invention is characterized in that:
used for vacuum filter-press dewatering of sludge and similar wastes/garbage/pollutants.
In addition, the invention also provides a dehydration method for treating the sludge of the landfill by vacuum negative pressure, which is characterized by comprising the following steps:
s1, placing landfill sludge on a base, and covering a composite filter plate according to any one of claims 1-6 on the surface of the landfill sludge;
and S2, vacuum pumping treatment is carried out on the moisture in the water-containing sludge by adopting a vacuum pump.
Further, the invention provides a dehydration method for treating landfill sludge by vacuum negative pressure, which is characterized by comprising the following steps:
adding a metal stabilizer into the dewatered sludge and stirring.
The invention has the beneficial effects that:
1) according to the method for treating the high-water-content landfill sludge by using the garnet and fiber composite material, the composite material filter plate is manufactured firstly, the landfill sludge is placed on the base, the filter plate covers the surface of the landfill sludge, the water in the water-containing sludge is subjected to vacuum pumping treatment by using the vacuum pump, fine particles in the sludge can be blocked by the filter plate formed by the composite material, and water molecules pass through the filter plate, so that the treatment cost of subsequent water treatment is greatly reduced, toxic substances cannot be separated out in the process, and secondary pollution cannot be generated.
2) The conventional vacuum filtration and pressure dehydration effect has a good dehydration effect in the early stage, but the sludge is difficult to reduce to the water content below 50%, the fine gaps on the material can enable the pressure to fully reach the surface of the sludge water so as to better extract the sludge water, the dehydration rate of the method to the sludge with high water content can reach more than 80% (meeting the requirement of landfill sludge entering), and the sludge can be added with a stabilizer for stirring after dehydration treatment, so that the leaching of pollutants is reduced.
3) The method is suitable for sludge of various landfills and is not limited by the water content of the sludge.
4) The fiber material adopted in the method is cotton fiber, is easy to obtain and has low price, and the method is favorable for popularization.
5) The filter plate manufactured by the invention can be repeatedly used and can be directly recycled after being simply cleaned.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the efficacy of the present invention easy to understand, the following examples specifically illustrate the method for treating high water content landfill sludge by using garnet and fiber composite material of the present invention, and the following embodiments are specific examples of the present invention and are not intended to limit the protection scope of the present invention.
The embodiment provides a method for vacuum negative pressure dehydration by using garnet to water-containing sludge, which comprises the following steps:
step one, selecting 35kg of ground garnet crushed materials (with the particle size of 1cm) and 1kg of cotton fibers according to the volume ratio of 1: 1 proportion (the application is selected according to the difference of the application requirements of the filter plate, the mass ratio of garnet to fiber can be in the range of 1: 0.5-1.5), 1kg of marble glue is added (in the application, according to the difference of the components in the filter plate, adhesives with different proportions such as 1-5% of the total weight of garnet crushed aggregates and cotton fibers can be adopted), and then the mixture is shaped to be made into a square plate with the thickness of 1cm, the side length is 1 meter, and the square plate is used as a dehydration filter plate.
And step two, maintaining the filter plate for at least 1 day.
Use example:
step one, taking 1 cubic meter of landfill sludge (the water content is 85 percent, and the heavy metal copper exceeds the standard), placing the landfill sludge in a 1 cubic meter container (plastic), and covering a composite filter plate.
And step two, sealing the composite filter plate and the periphery of the container, connecting the surface layer of the filter plate with a vacuum negative pressure power source device of a vacuum pump to apply vacuum negative pressure to the sludge treatment tank, and preparing for water extraction. Two batches were withdrawn separately.
And step three, adjusting the vacuum pump to a proper pressure, and performing vacuum negative pressure water pumping for 10 minutes, 30 minutes and 60 minutes. Pumping water in the sludge into a temporary wastewater storage device for subsequent treatment
And step four, adding 10kg of sludge polluted by heavy metal copper with a copper metal stabilizer (quicklime, cement and the like) by the addition ratio of 1%, and carrying out stabilization treatment.
And step five, pouring out the dewatered sludge, detecting the water content and maintaining.
Analyzing and detecting: and under the condition of ensuring that the maintenance condition is not changed, samples are taken every 7d, 1 month and 3 months for corresponding analysis and detection, and the samples are not taken out for continuous maintenance.
The toxicity (copper) leaching test is carried out on the stabilized soil by referring to HJ/T299-2007 solid waste-leaching toxicity leaching method-sulfuric acid-nitric acid method, and the copper leaching concentration is determined according to the standard GB5085.3-2007 hazardous waste identification standard-leaching toxicity identification.
Meanwhile, in order to further detect the long-term stability of the stabilizing effect, a long-term leaching experiment is carried out on the copper-polluted soil treated by the stabilizing agent by adopting a repeated leaching experiment for many times, the leaching concentration of copper is less than or equal to 35.2mg/L through determination, and the treated polluted soil is non-dangerous waste according to the copper identification standard in hazardous waste identification standard-leaching toxicity identification (GB 5085.3-2007).
< comparative example (conventional vacuum Filter-pressing Equipment model LDD1000S8W) >
By conventional vacuum filtration operation (not outlined here)
TABLE 1 Water content test results (Water extraction Length and Water content) of the inventive examples
| Serial number | Time length (minutes) | Water content (%) |
| 1 | 10 | 48.3 |
| 2 | 30 | 40.9 |
| 3 | 60 | 35.1 |
TABLE 2 moisture content test results (length of water draw and moisture content) of conventional vacuum filter press (belt filter press)
| Serial number | Time length (minutes) | Water content (%) |
| 1 | 10 | 65.2 |
| 2 | 30 | 63.1 |
| 3 | 60 | 61.5 |
TABLE 3 moisture content test results of single garnet vacuum filter press (Water pumping duration and moisture content)
| Serial number | Time length (minutes) | Water content (%) |
| 1 | 10 | 70.2 |
| 2 | 30 | 68.1 |
| 3 | 60 | 66.5 |
As can be seen from tables 1 and 2, the water content of the sludge with the water content of 85 percent can reach the standard of sludge entering a common landfill site after the sludge is subjected to vacuum treatment for 30 minutes by the material and the process used by the invention. And the water content can not be reduced to below 60% by the conventional vacuum filtration pressure. As can be seen from table 3, the vacuum filtration of the mono-garnet material can provide a certain dewatering effect, but the treatment effect is lower than that of the composite material. Therefore, the invention is superior to the conventional vacuum filtration and compression dehydration effect.
TABLE 4 test results (copper leaching concentration and repairing efficiency) of examples
As can be seen from Table 4, the addition of the copper heavy metal stabilizer after the dehydration of the copper-containing sludge can achieve a good remediation effect and has long-term stability.
Claims (9)
1. A composite filter plate is characterized in that: is made by compounding garnet and fiber;
wherein the mass ratio of garnet to fiber is 1: 0.5-1.5.
2. A composite filter plate according to claim 1 wherein:
the garnet is garnet particles after grinding treatment;
the average particle diameter of the garnet crushed grains is 1cm or less.
3. A composite filter plate according to claim 1 wherein:
the fibers are selected from plant fibers;
preferably, the fibers are selected from fibers having acid and alkali resistance properties;
most preferably, the fibers are selected from cotton fibers.
4. The composite filter plate of claim 1, wherein the specific manufacturing method is as follows:
step one, garnet and fiber are uniformly mixed, and then an adhesive is added for shaping to manufacture a plate with a specified thickness;
and step two, maintaining the filter plate for at least 1 day.
5. A composite filter plate according to claim 4 wherein:
the binder is used in an amount of 1-5% by weight based on the combined weight of garnet and fiber.
6. A composite filter plate according to claim 4 wherein:
the adhesive is selected from marble glue.
7. A composite filter plate according to any one of claims 1 to 6, wherein:
used for vacuum filter-press dewatering of sludge and similar wastes/garbage/pollutants.
8. A dehydration method for treating landfill sludge by vacuum negative pressure is characterized by comprising the following steps:
s1, placing landfill sludge on a base, and covering a composite filter plate according to any one of claims 1-6 on the surface of the landfill sludge;
and S2, vacuum pumping treatment is carried out on the moisture in the water-containing sludge by adopting a vacuum pump.
9. The method for dewatering vacuum negative pressure landfill sludge according to claim 8, wherein the method comprises the following steps:
adding a metal stabilizer into the dewatered sludge and stirring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011002641.2A CN112316560A (en) | 2020-09-22 | 2020-09-22 | Dehydration method for treating landfill sludge by utilizing garnet and fiber under vacuum negative pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011002641.2A CN112316560A (en) | 2020-09-22 | 2020-09-22 | Dehydration method for treating landfill sludge by utilizing garnet and fiber under vacuum negative pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112316560A true CN112316560A (en) | 2021-02-05 |
Family
ID=74303511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011002641.2A Pending CN112316560A (en) | 2020-09-22 | 2020-09-22 | Dehydration method for treating landfill sludge by utilizing garnet and fiber under vacuum negative pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112316560A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3042157A1 (en) * | 1980-11-08 | 1982-05-19 | Franz 2000 Hamburg Prymelski | Dimensionally stable filter plate free from asbestos - based on magnesia cement, cellulose fibre, wood filler and inorganic filler |
| US4382863A (en) * | 1979-11-30 | 1983-05-10 | International Sludge Reduction Company | Sludge dewatering system |
| US4452698A (en) * | 1981-08-27 | 1984-06-05 | U.S. Environmental Products, Inc. | Rigid filter plate and process for manufacture of the same |
| JPS6121799A (en) * | 1984-07-09 | 1986-01-30 | Mitsui Petrochem Ind Ltd | Dehydration treatment of water-containing sludge |
| US4783261A (en) * | 1987-07-24 | 1988-11-08 | Lingle E Arnold | Rigid filter plate and method for producing same |
| CN202010459U (en) * | 2010-12-31 | 2011-10-19 | 杭州兴源过滤科技股份有限公司 | Special nanometer mixing layer filter plate for filter press |
| US20120171465A1 (en) * | 2009-09-11 | 2012-07-05 | Peter Barend Hopperus-Buma | Tough, water-permeable paver |
| US20140291224A1 (en) * | 2011-10-03 | 2014-10-02 | Ishigaki Company Limited | Indefinite form filter medium layer and filter device provided with same |
| CN104667631A (en) * | 2015-01-23 | 2015-06-03 | 湖北步洲环保科技有限公司 | Novel composite filtering material and preparation method thereof |
| US20160360745A1 (en) * | 2015-06-13 | 2016-12-15 | A Better Life Worldwide, Llc | Compositions for Purification |
| CN206262177U (en) * | 2016-11-17 | 2017-06-20 | 濮阳市中原石化实业有限公司 | A kind of more medium filter |
| US20170247265A1 (en) * | 2014-07-30 | 2017-08-31 | Mitsubishi Materials Corporation | Filter medium, method for producing filter medium, water treatment module, and water treatment device |
| CN210544272U (en) * | 2019-04-22 | 2020-05-19 | 江苏民生特种设备集团有限公司 | High-efficient desulfurizing tower is used in industry environmental protection |
-
2020
- 2020-09-22 CN CN202011002641.2A patent/CN112316560A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4382863A (en) * | 1979-11-30 | 1983-05-10 | International Sludge Reduction Company | Sludge dewatering system |
| DE3042157A1 (en) * | 1980-11-08 | 1982-05-19 | Franz 2000 Hamburg Prymelski | Dimensionally stable filter plate free from asbestos - based on magnesia cement, cellulose fibre, wood filler and inorganic filler |
| US4452698A (en) * | 1981-08-27 | 1984-06-05 | U.S. Environmental Products, Inc. | Rigid filter plate and process for manufacture of the same |
| JPS6121799A (en) * | 1984-07-09 | 1986-01-30 | Mitsui Petrochem Ind Ltd | Dehydration treatment of water-containing sludge |
| US4783261A (en) * | 1987-07-24 | 1988-11-08 | Lingle E Arnold | Rigid filter plate and method for producing same |
| US20120171465A1 (en) * | 2009-09-11 | 2012-07-05 | Peter Barend Hopperus-Buma | Tough, water-permeable paver |
| CN202010459U (en) * | 2010-12-31 | 2011-10-19 | 杭州兴源过滤科技股份有限公司 | Special nanometer mixing layer filter plate for filter press |
| US20140291224A1 (en) * | 2011-10-03 | 2014-10-02 | Ishigaki Company Limited | Indefinite form filter medium layer and filter device provided with same |
| US20170247265A1 (en) * | 2014-07-30 | 2017-08-31 | Mitsubishi Materials Corporation | Filter medium, method for producing filter medium, water treatment module, and water treatment device |
| CN104667631A (en) * | 2015-01-23 | 2015-06-03 | 湖北步洲环保科技有限公司 | Novel composite filtering material and preparation method thereof |
| US20160360745A1 (en) * | 2015-06-13 | 2016-12-15 | A Better Life Worldwide, Llc | Compositions for Purification |
| CN206262177U (en) * | 2016-11-17 | 2017-06-20 | 濮阳市中原石化实业有限公司 | A kind of more medium filter |
| CN210544272U (en) * | 2019-04-22 | 2020-05-19 | 江苏民生特种设备集团有限公司 | High-efficient desulfurizing tower is used in industry environmental protection |
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Application publication date: 20210205 |