CN112159075A - Sludge freeze dehydration device and sludge dehydration method - Google Patents
Sludge freeze dehydration device and sludge dehydration method Download PDFInfo
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- CN112159075A CN112159075A CN202011033470.XA CN202011033470A CN112159075A CN 112159075 A CN112159075 A CN 112159075A CN 202011033470 A CN202011033470 A CN 202011033470A CN 112159075 A CN112159075 A CN 112159075A
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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
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
- C02F11/20—Treatment of sludge; Devices therefor by thermal conditioning by freezing
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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
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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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
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- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
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- Treatment Of Sludge (AREA)
Abstract
The invention aims to provide a safe, energy-saving, efficient and stable sludge freeze dehydration device and a sludge dehydration method. The sludge freeze dehydration device comprises a feeding device, a freeze treatment device and a spiral extrusion filter, the freeze treatment device comprises a refrigerator and a crushing device, the spiral extrusion filter comprises a sludge transmission channel, and the sludge transmission channel sequentially comprises a crushing treatment section, a heating treatment section and a filtering treatment section from back to front along a sludge transmission path. The invention relates to a sludge freeze dehydration device and a sludge dehydration method, wherein a freeze treatment device is used for freezing and crushing sludge to destroy the cell structure of microorganisms in the sludge, so that water in cells is separated out, and a spiral extrusion filter is used for melting the frozen sludge and then performing solid-liquid separation to obtain the dehydrated sludge with low water content.
Description
Technical Field
The invention relates to the field of sludge treatment, in particular to a sludge freeze dehydration device and a sludge dehydration method.
Background
The activated sludge process or the improved process based thereon is the most common sewage treatment process currently used in China, in which a considerable portion of the pollutants in the sewage are transferred to the activated sludge. In addition, because industrial sewage and domestic sewage in China are often mixed together for treatment, a large amount of toxic and harmful substances such as heavy metals and the like also exist in the activated sludge. In order to prevent secondary pollution caused by sludge and ensure normal operation and sewage treatment effect of a sewage treatment plant, sludge needs to be properly treated.
The water content of sludge generated by sewage plants is generally about 80%, and the conventional sludge treatment processes comprise landfill, composting, drying treatment and the like. Since the sludge contains a large amount of moisture, direct landfill affects the normal operation of a landfill site, occupies a large area, and is prohibited at present. The sludge contains a large amount of toxic and harmful substances such as heavy metals, which causes low market acceptance of sludge compost products and difficult large-scale popularization and application of the technology. The sludge drying technology generally adopts high-temperature high-pressure steam as a heat source, and has higher energy consumption and operation cost; high temperature drying also presents a dust explosion risk; the sludge wall-sticking phenomenon causes the poor operation stability of the equipment.
Disclosure of Invention
The invention aims to provide a high-efficiency, energy-saving, stable and safe sludge freeze dehydration device and a sludge dehydration method, so as to solve the problems of high energy consumption, low safety and poor stability of sludge dehydration in the prior art.
In order to achieve the purpose, the invention provides a sludge freeze dehydration device, which comprises a feeding device and a freeze treatment device with a freeze feeding hole and a freeze discharging hole, and a screw extrusion filter with a filter feed inlet and a filter discharge outlet, wherein the feed device is connected with the freezing feed inlet, the freezing discharge outlet is connected with the filter feed inlet, wherein the freezing treatment device comprises a refrigerator for freezing the sludge and a crushing device for crushing the frozen sludge, the spiral extrusion filter comprises a sludge transmission channel, and the sludge transmission channel sequentially comprises a crushing treatment section for crushing sludge, a heating treatment section for melting frozen sludge and a filtering treatment section for separating sludge from water from back to front along a sludge transmission path.
Preferably, the screw extrusion filter comprises a housing having an inner cavity, and a rotating screw rotatably disposed in the inner cavity around its axial line and having a spiral piece at its outer periphery, wherein the length of the rotating screw extends in the same direction as the sludge conveying passage, and the rotating screw penetrates the crushing section, the heating section, and the filtering section along its length.
Preferably, in the crushing treatment section, the casing is tapered such that a cross-sectional area thereof gradually decreases from the rear to the front along the conveyance path, and the flight is gradually decreased from the rear to the front along the conveyance path.
Preferably, the heating treatment section is provided with a heating device, the heating device comprises an electric heating wire, and the rear end of the filtering treatment section is also provided with a thermocouple for detecting whether the sludge reaches a set temperature.
Preferably, the sludge freeze dehydration device further comprises a backwashing device connected with a backwashing pipe, the filtering processing section is provided with a filter screen, the filter screen divides the filtering processing section into a water outlet area and a sludge outlet area which are not communicated with each other, the sludge outlet area is provided with a discharge port of the filter, and the water outlet area is provided with a water outlet of the filter for discharging water and backwashing water separated from the sludge and a backwashing water inlet for connecting the backwashing pipe.
Preferably, the refrigerator has and is used for transmitting the mud after freezing to breaker's freezing transmission band, freezing transmission band has many, every freezing transmission band all includes input port and delivery outlet, and every adjacent two all be equipped with a set ofly between the freezing transmission band breaker, breaker is connected at the previous strip the delivery outlet of freezing transmission band and next strip between the feed inlet of freezing transmission band.
Preferably, each group of the crushing devices comprises a crusher and a sludge conveyor connected to the rear end of the crusher, the crusher comprises a crushing part provided with a spiral-belt type stirrer and a jacket part sleeved outside the crushing part and provided with a water inlet and a water outlet, and the crushing part and the jacket part are not communicated with each other.
The invention also provides a sludge dewatering method, which comprises the following steps:
(1) conveying the pre-dewatered sludge to a refrigerator for freezing;
(2) conveying the frozen sludge obtained in the step (1) to a crushing device for crushing and heating for melting;
(3) conveying the crushed and melted sludge obtained in the step (2) to a refrigerator for freezing again;
(4) conveying the frozen sludge obtained in the step (3) to a screw extrusion filter, sequentially carrying out crushing, melting and filtering treatment, and respectively discharging dehydrated sludge and dehydrated water;
repeating the steps (2) and (3) at least twice before the step (4).
Preferably, the sludge freeze-dehydration device feeds normal-temperature water into the crushing device at the same time of the step (2) to indirectly contact and heat the frozen sludge in the crushing device.
Preferably, the sludge dewatering method is implemented based on the sludge freeze-dewatering device.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention relates to a sludge freeze dehydration device and a sludge dehydration method, wherein a freeze treatment device is used for freezing and crushing sludge to destroy the cell structure of microorganisms in the sludge, so that water in cells is separated out, and a spiral extrusion filter is used for melting the frozen sludge and then performing solid-liquid separation to obtain the dehydrated sludge with low water content. 1. The whole device operates in a low-temperature environment, the odor volatilization rate is low, and the on-site odor is small; 2. the sludge is only required to be cooled to the freezing temperature from room temperature, the temperature difference of the cooled temperature is small, and most of water in the sludge is removed in a mechanical mode, so that compared with drying evaporation, the technology saves a large amount of energy; 3. the sludge is repeatedly frozen and melted for many times, deep crushing and filter pressing are simultaneously carried out on the sludge in the spiral extrusion filter, the wall breaking effect of sludge cells is better, and the finally obtained sludge has low water content. In conclusion, the sludge freeze dehydration device and the sludge dehydration method have the advantages of safety, energy conservation, high efficiency and stability.
Drawings
FIG. 1 is a schematic view of the overall structure of a sludge freeze-dehydration apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a screw extrusion filter in this embodiment;
FIG. 3 is two schematic structural views of the baffle plate in the embodiment;
wherein: 1. a feeding device; 11. a screw pump; 12. a granulator;
2. a freezer; 21. a freezing feed port; 22. freezing a discharge hole; 23. a freezing conveyor belt; 231. a first conveyor belt; 232. a second conveyor belt; 233. a third conveyor belt; 24. an air inlet; 25. an air outlet;
3. a crushing device; 31. a crusher; 311. a crushing section; 3111. a ribbon blender; 312. a jacket portion; 32. a sludge conveyor;
4. a screw extrusion filter; 41. a feed inlet of the filter; 42. a discharge port of the filter; 43. rotating the screw; 431. a spiral sheet; 44. a crushing treatment section; 45. a heat treatment section; 451. a heating device; 46. a filtration treatment section; 461. filtering with a screen; 462. a water outlet area; 463. a mud discharging area; 464. a water outlet of the filter; 465. backwashing the water inlet; 466. a baffle plate; 4661. a circular hole; 47. a housing.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the specific embodiments.
Referring to fig. 1, the sludge freeze dehydration device comprises a feeding device 1, a freezing treatment device and a screw extrusion filter 4, wherein the feeding device 1 specifically comprises a screw pump 11 and a granulator 12 connected at the rear end of the screw pump, the freezing treatment device comprises a refrigerator 2 and a crushing device 3, and the crushing device 3 comprises a crusher 31 and a sludge conveyor 32 connected at the rear end of the crusher.
The refrigerator 2 has the freezing feed inlet 21 of connecting granulator 12, and the freezing discharge gate 22 of connecting spiral extrusion filter 4, in this embodiment, be equipped with three freezing transmission band 23 in the refrigerator 2, be first transmission band 231, second transmission band 232 and third transmission band 233 along mud transmission direction in proper order, three freezing transmission band 23 parallel operation, every freezing transmission band 23 all includes input port and delivery outlet, all be equipped with a set of breaker 3 between every two adjacent freezing transmission bands 23, breaker 3 is connected between the delivery outlet of the freezing transmission band 23 of previous and the input port of the freezing transmission band 23 of next.
In this embodiment, air is used as cooling gas in the refrigerator 2, sludge is frozen by direct contact, an air inlet 24 for inputting cooling gas is provided at the bottom of the refrigerator 2, an air outlet 25 for outputting cooling gas is provided at the top of the refrigerator 2, and the heated cooling gas is discharged from the air outlet 25, cooled by a heat pump (not shown) provided outside the refrigerator 2, and input into the air inlet 24 again for recycling.
As shown in fig. 1, the crusher 31 includes a crushing portion 311 and a jacket portion 312 that is sleeved outside the crushing portion 311, and the crushing portion 311 and the jacket portion 312 are not communicated with each other. The crushing portion 311 has a sludge inlet and a sludge outlet, the sludge inlet receives the sludge fed from the freezing conveyor belt 23, the sludge outlet transmits the crushed sludge to the sludge conveyor 32, and a helical agitator 3111 for crushing the sludge is further provided in the crushing portion 311. The jacket portion 312 has a water inlet and a water outlet, and is used for introducing normal temperature water to heat and melt the frozen sludge in the crushing portion 311. The sludge crushed and melted in the crusher 31 is conveyed to the input port of the next freezing conveyor 23 via the sludge conveyor 32.
The sludge discharged from the first conveyor belt 231 and the second conveyor belt 232 is processed by a set of crushing devices 3 and conveyed to the next freezing conveyor belt 23, and the sludge in the third conveyor belt 233 is discharged from the freezing discharge port 22 and enters the screw extrusion filter 4.
As shown in figure 2, the screw extrusion filter 4 comprises a shell 47 with an inner cavity, a sludge transmission channel is arranged in the inner cavity, the sludge transmission channel sequentially comprises a crushing treatment section 44, a heating treatment section 45 and a filtering treatment section 46 from back to front along a sludge transmission path, the crushing treatment section 44 is communicated with a filter feeding hole 41, and the filtering treatment section 46 is communicated with a filter discharging hole 42.
The inner cavity of the screw extrusion filter 4 is provided with a rotating screw 43 rotating around the self axial lead, the periphery of the rotating screw 43 is provided with a spiral sheet 431, the length extending direction of the rotating screw 433 is consistent with the extending direction of the sludge conveying channel, and the rotating screw 43 penetrates through the crushing treatment section 44, the heating treatment section 45 and the filtering treatment section 46 along the self length direction.
Specifically, in the crushing treatment section 44, the outer shell 47 is tapered such that the cross-sectional area thereof gradually decreases from the rear to the front along the conveyance path, and the spiral piece 431 provided in the crushing treatment section 44 gradually decreases from the rear to the front along the conveyance path.
The heating treatment section 45 is provided with a heating device 451 with an electric heating wire, and the rear end of the filtering treatment section 46 is also provided with a thermocouple (not shown in the figure) for detecting the temperature of the sludge and controlling the start, stop and operation of the heating device 451.
The filtering section 46 is provided with a cylindrical filter screen 461 along the inner circumference of the housing 47, the filter screen 461 divides the filtering section 46 into a mud discharging area 463 and a water discharging area 462 which are not communicated with each other inside and outside, the mud discharging area 463 at the inner side is provided with a discharge port 42 of the filter, and the water discharging area 462 at the outer side is provided with a water outlet 464 of the filter. The sludge freeze-drying device further includes a back-washing unit (not shown) connected to a back-washing pipe for back-washing the filter screen 461 when the flow rate of the filtered water is significantly reduced to restore the filtering capability of the filter screen 461. The outlet section 462 also has a backwash inlet 465 connected to a backwash pipe, which likewise exits the filter outlet 464.
As shown in figure 3, a baffle 466 is arranged at the discharge port 42 of the filter, one or more round holes 4661 are arranged on the baffle 466, and the pressure in the screw extrusion filter 4 can be controlled by the number of the holes and the rotating speed of the rotating screw 43. When the spiral extrusion filter 4 is back flushed, a blind plate (not shown in the figure) for shielding is also arranged on the discharge hole 42 of the filter.
The working process of the sludge freeze dehydration device in the embodiment is specifically described as follows:
as shown in FIG. 1, when the sludge is used, the sludge which is pre-dewatered at room temperature and has a water content of about 80% and is generated in a sewage treatment plant is first conveyed to a granulator 12 by a screw pump 11 for granulation, and then the granulated sludge is introduced into a first conveyor belt 231 in a freezer 2 through a freezing inlet 21 for freezing treatment. Cooling air with the temperature of about-20 ℃ enters the refrigerating machine 2 from the air inlet 24, is in direct contact with sludge on each freezing transmission belt 23, freezes the sludge to the temperature of minus 5 ℃ to minus 10 ℃, and water in the sludge is converted from liquid state to solid state to generate phase change, the volume of a main component of the sludge, namely microorganisms, is expanded, cell walls are broken, and cell structures are damaged. The cooling air discharged from the air outlet 25 is about-10 deg.c, and is delivered to the heat pump to cool to about-20 deg.c and then delivered to the air inlet 24 again.
The frozen sludge discharged from the first conveyor 231 enters a set of crushing devices 3, and the sludge structure in a frozen state is further destroyed by stirring and pressing by a ribbon stirrer 3111 in the crushing section 311; meanwhile, normal temperature water of about 25 ℃ is introduced into the jacket part 312 to heat the sludge in the crushing part 311, and friction heat generated by stirring is added, so that the sludge in the crushing part 311 is melted into liquid.
The melted sludge is transferred to the second transfer belt 232 by the sludge transfer machine 32, and the freezing-crushing-melting process in the first transfer belt 231 and the crushing device 3 is repeated, and then transferred to the third transfer belt 233 for the final freezing process.
The frozen sludge discharged from the third conveyor 233 passes through the frozen discharge port 22 and the filter feed port 41, enters the crushing treatment section 44 of the screw extrusion filter 4, and is continuously conveyed forward by the surface friction action of the inner wall of the body and the rotating screw 43. The conical structure of the crushing treatment section 44 can generate strong shearing, stirring, friction and extrusion effects, so that the frozen solid sludge is crushed, particles become small, and the cell structure is further damaged; in the process, the temperature of the sludge is gradually increased, and the moisture in the sludge is gradually converted into liquid. When the sludge enters the heating treatment section 45, the heating device 451 is electrically heated to ensure that the sludge is completely converted into liquid; the thermocouple provided at the rear end of the filtration treatment section 46 is used to monitor whether the sludge temperature reaches a set temperature, and when the sludge temperature is lower than the set temperature, the control circuit connected to the thermocouple can turn on the heating device 451 to heat the sludge. Finally, the sludge enters the filtering treatment section 46, under the pressure action of the rotating screw 43, the water in the sludge is separated from the filter screen 461 to the water outlet area 462 and is discharged, the water content of the sludge is obviously reduced, and a sludge filter cake with the water content of about 50 percent is obtained from the discharge port 42 of the filter.
So, the mud freeze-dehydration device of this embodiment is through freezing, breakage, the processing of melting repeatedly to mud, has realized the broken wall of efficient mud microorganism for the effective separation of mud and moisture, final mud moisture content is low, is a safe, energy-conserving, high-efficient, stable mud freeze-dehydration device.
The above-mentioned embodiments are merely illustrative of the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (10)
1. The utility model provides a mud freeze dehydration device which characterized in that: including feed arrangement, have freezing processing apparatus of freezing feed inlet and freezing discharge gate to and the screw extrusion filter of filter feed inlet and filter discharge gate has, feed arrangement with freezing feed inlet is connected, freezing discharge gate is connected the filter feed inlet, wherein, freezing processing apparatus is including being used for carrying out the refrigerator of freezing processing to mud to and be used for carrying out the breaker of breaker to mud after freezing, screw extrusion filter includes mud transmission path, mud transmission path is followed the transmission path of mud and is followed the back and is included the broken handle section that is used for broken mud forward in proper order, be used for melting the thermal treatment section of freezing mud to and be used for carrying out the filter treatment section mud freeze dewatering device that separates mud and moisture.
2. The sludge freeze-dehydration apparatus according to claim 1, characterized in that: the spiral extrusion filter comprises a shell with an inner cavity and a rotating screw rod which is rotatably arranged in the inner cavity around the axis of the rotating screw rod, wherein spiral sheets are arranged on the periphery of the rotating screw rod, the length extension direction of the rotating screw rod is consistent with the extension direction of the sludge transmission channel, and the rotating screw rod penetrates through the crushing treatment section, the heating treatment section and the filtering treatment section along the length direction of the rotating screw rod.
3. The sludge freeze-dehydration apparatus according to claim 2, characterized in that: in the crushing treatment section, the housing is tapered such that a cross-sectional area thereof gradually decreases from the rear to the front along the conveyance path, and the flight is gradually decreased from the rear to the front along the conveyance path.
4. The sludge freeze-dehydration apparatus according to claim 1, characterized in that: the heating treatment section is provided with a heating device, the heating device comprises an electric heating wire, and the rear end of the filtering treatment section is also provided with a thermocouple for detecting whether the sludge reaches a set temperature.
5. The sludge freeze-dehydration apparatus according to claim 1, characterized in that: the sludge freeze dehydration device further comprises a backwashing device connected with a backwashing pipe, the filtering treatment section is provided with a filter screen, the filter screen divides the filtering treatment section into a water outlet area and a sludge outlet area which are not communicated with each other, the sludge outlet area is provided with a discharge port of the filter, and the water outlet area is provided with a water outlet of the filter for discharging water and backwashing water separated from sludge and a backwashing water inlet for connecting the backwashing pipe.
6. The sludge freeze-dewatering device according to any one of claims 1 to 5, characterized in that: the refrigerator has and is used for transmitting the mud after freezing extremely breaker's freezing transmission band, freezing transmission band has many, every freezing transmission band all includes input port and delivery outlet, and every adjacent two all be equipped with a set ofly between the freezing transmission band breaker, breaker connects the previous one the delivery outlet of freezing transmission band and back one between the feed inlet of freezing transmission band.
7. The sludge freeze-dehydration apparatus according to claim 6, characterized in that: each group of crushing devices comprises a crusher and a sludge conveyor connected to the rear end of the crusher, each crusher comprises a crushing part provided with a spiral-belt type stirrer and a jacket part sleeved outside the crushing part and provided with a water inlet and a water outlet, and the crushing part and the jacket part are not communicated with each other.
8. A sludge dewatering method is characterized in that: the method comprises the following steps:
(1) conveying the pre-dewatered sludge to a refrigerator for freezing;
(2) conveying the frozen sludge obtained in the step (1) to a crushing device for crushing and heating for melting;
(3) conveying the crushed and melted sludge obtained in the step (2) to a refrigerator for freezing again;
(4) conveying the frozen sludge obtained in the step (3) to a screw extrusion filter, sequentially carrying out crushing, melting and filtering treatment, and respectively discharging dehydrated sludge and dehydrated water;
repeating the steps (2) and (3) at least twice before the step (4).
9. The sludge dewatering method according to claim 8, characterized in that: and (3) introducing normal-temperature water into the crushing device at the same time of the step (2), and carrying out indirect contact heating on the frozen sludge in the crushing device.
10. The sludge dewatering method according to any one of claims 8 or 9, characterized in that: the sludge dewatering method is carried out based on the sludge freeze-dewatering device according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011033470.XA CN112159075A (en) | 2020-09-27 | 2020-09-27 | Sludge freeze dehydration device and sludge dehydration method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011033470.XA CN112159075A (en) | 2020-09-27 | 2020-09-27 | Sludge freeze dehydration device and sludge dehydration method |
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| CN112159075A true CN112159075A (en) | 2021-01-01 |
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| CN202011033470.XA Pending CN112159075A (en) | 2020-09-27 | 2020-09-27 | Sludge freeze dehydration device and sludge dehydration method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113003916A (en) * | 2021-02-09 | 2021-06-22 | 杭州国泰环保科技股份有限公司 | Nested formula sludge low temperature mummification prilling granulator |
| CN114195358A (en) * | 2021-12-08 | 2022-03-18 | 江苏中顺节能科技有限公司 | Activated sludge freeze-thawing drying device and drying method |
| CN114751618A (en) * | 2022-02-25 | 2022-07-15 | 上海固雅环境科技有限公司 | Sludge low-temperature drying system and drying method |
| CN115057606A (en) * | 2022-06-20 | 2022-09-16 | 刘艳菊 | Sludge dewatering method |
-
2020
- 2020-09-27 CN CN202011033470.XA patent/CN112159075A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113003916A (en) * | 2021-02-09 | 2021-06-22 | 杭州国泰环保科技股份有限公司 | Nested formula sludge low temperature mummification prilling granulator |
| CN114195358A (en) * | 2021-12-08 | 2022-03-18 | 江苏中顺节能科技有限公司 | Activated sludge freeze-thawing drying device and drying method |
| CN114751618A (en) * | 2022-02-25 | 2022-07-15 | 上海固雅环境科技有限公司 | Sludge low-temperature drying system and drying method |
| CN115057606A (en) * | 2022-06-20 | 2022-09-16 | 刘艳菊 | Sludge dewatering method |
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