CN115057598A - Sludge positive and negative pressure dewatering system and method - Google Patents
Sludge positive and negative pressure dewatering system and method Download PDFInfo
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- CN115057598A CN115057598A CN202210634236.5A CN202210634236A CN115057598A CN 115057598 A CN115057598 A CN 115057598A CN 202210634236 A CN202210634236 A CN 202210634236A CN 115057598 A CN115057598 A CN 115057598A
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- 239000010802 sludge Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000002689 soil Substances 0.000 claims abstract description 20
- 230000018044 dehydration Effects 0.000 claims abstract description 18
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 18
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 239000004746 geotextile Substances 0.000 claims description 20
- 238000012544 monitoring process Methods 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 230000009471 action Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 10
- 239000010865 sewage Substances 0.000 description 6
- 238000007596 consolidation process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000903 blocking 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
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/063—Underpressure, vacuum
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/066—Overpressure, high pressure
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sludge positive and negative pressure dehydration system and a method, wherein the sludge positive and negative pressure dehydration system comprises a positive pressure applying device and a negative pressure drainage device, the positive pressure applying device comprises a sealed box body, a pneumatic valuator and an air compressor, the air compressor is connected with the air compressor through a first pipeline, the pneumatic valuator is arranged on the first pipeline, and a filling soil bag is arranged in the sealed box body; the negative pressure drainage device comprises a vacuum jet pump, a drainage plate assembly, a vacuum water filtering pipe and a water-gas separator, wherein the drainage plate assembly is arranged in the sealed box body and is connected with the vacuum water filtering pipe, the vacuum water filtering pipe is connected with the water-gas separator through a second pipeline, and the water-gas separator is connected with the vacuum jet pump. The invention utilizes the combination of vacuum preloading and forward pressure to continuously solidify the sludge under the action of positive and negative pressure, and the forward pressure applies load larger than atmospheric pressure to make up the problem of limited vacuum preloading pressure, thereby reducing the cost, having good dehydration effect and high efficiency.
Description
Technical Field
The invention relates to a sludge treatment technology, in particular to a sludge positive and negative pressure dehydration system.
Background
The sludge and the bottom mud are polluted soil generated in the urban domestic sewage treatment process and bottom mud dredged in rivers and lakes, have high water content and fine particles, are mainly in a flow plastic state, and contain a large amount of pollutants compared with the common blow-fill sludge. For sludge treatment, the sludge is generally dewatered in sewage plants and then directly backfilled in low-lying positions of landfill sites. However, in sewage plants, due to high dehydration cost, the water content of sludge after general treatment is still very high, unstable sludge landfill sites are easily formed, on one hand, the volume of sludge with high water content is large, and a large amount of storage capacity of the landfill sites is easily occupied, on the other hand, in open landfill sites, the water content of sludge is further increased due to rainfall and the like, and the garbage heap body is easily slipped under the loading of solid garbage. Therefore, the sludge needs to be strengthened urgently.
At present, two modes are mainly adopted for sludge treatment, one mode is dehydration and subsequent solidification treatment in a sewage plant, and the physical and chemical modes are mainly adopted for sludge dehydration and in-situ solidification treatment, so that the treatment method has high cost and low efficiency. The other type mainly adopts the traditional sludge reinforcement treatment method, namely a vacuum preloading mode is adopted, and negative pressure is applied to sludge to accelerate the discharge and consolidation of pore water in the sludge. The method is low in treatment cost, but municipal sludge is different from hydraulic filling sludge in engineering mechanical property, the consolidation coefficient of the municipal sludge reaches 10-5cm2/s and is one order of magnitude smaller than that of common sludge, the water content of the sludge is 500-600% after evaluation, the organic matter content is 70%, the traditional vacuum preloading consolidation effect is uncertain compared with the traditional sludge, and in addition, the dewatering and vacuum preloading consolidation modes are combined simultaneously, namely, preliminary dewatering is carried out in a physical or chemical mode, or modification is carried out in a chemical mode, and then vacuum preloading is carried out. Such a mixing method is complicated in process and high in implementation cost.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a sludge positive and negative pressure dehydration system. The sludge positive and negative pressure dewatering system improves the dewatering effect and has high efficiency.
Meanwhile, the invention also aims to provide a positive and negative pressure sludge dewatering method.
The purpose of the invention is realized by the following technical scheme: the sludge positive-negative pressure dewatering system comprises a positive pressure applying device and a negative pressure drainage device, wherein the positive pressure applying device comprises a sealed box body, a pneumatic valuator and an air compressor, the air compressor is connected with the air compressor through a first pipeline, the pneumatic valuator is arranged on the first pipeline, and a filling soil bag is arranged in the sealed box body; the negative pressure drainage device comprises a vacuum jet pump, a drainage plate assembly, a vacuum filter pipe and a water-gas separator, wherein the drainage plate assembly is arranged in the sealed box body and is connected with the vacuum filter pipe, the vacuum filter pipe is connected with the water-gas separator through a second pipeline, and the water-gas separator is connected with the vacuum jet pump.
Preferably, the moisture separator is provided with a water level monitoring scale for monitoring the water level in real time, a vacuum pressure test meter for monitoring the applied vacuum degree and a drain valve for draining water.
Preferably, the drainage plate assembly comprises a plurality of drainage plates which are uniformly distributed in a row in the sealed box body; the drain bar includes filter membrane section and separation section, the separation section is connected with the rear end of filter membrane section, the front end of filter membrane section is connected with the vacuum strainer through connecting.
Preferably, the vacuum water filter pipes comprise inner connecting pipes with the same number of outer connecting pipes and water discharging plates, joints of the water discharging plates are connected with one ends of the corresponding inner connecting pipes, the other ends of the inner connecting pipes are connected with the outer connecting pipes, and the outer connecting pipes are connected with the water-gas separator through second pipelines; the inner connecting pipe is provided with a one-way valve.
Preferably, the filling geotextile bags have two layers, and the drainage plate assembly is arranged between the two layers of the filling geotextile bags.
Preferably, a flat car for bearing the filled geotextile bags is arranged in the sealed box body.
Preferably, the top cover of the sealed box body is provided with a pressure sensor for monitoring the pressure in the box.
The positive and negative pressure sludge dewatering method adopts the positive and negative pressure sludge dewatering system and comprises the following steps:
s1, filling the sludge into the filling geotextile bags, and filling the filling geotextile bags filled with the sludge into a sealed box body;
s2, starting the vacuum jet pump, and vacuumizing the sealed box body through the drainage plate assembly to accelerate the discharge of water in the sludge filled in the geotextile bags;
s3, keeping the vacuum jet pump running and intermittently running the air compressor;
s4, after dewatering the sludge in the sealed box, taking out the sealed box and filling the soil engineering bags, and repeating the steps S1-S3.
Preferably, when the air compressor operates intermittently, the pressure value in the sealed box body is 0-500 kPa.
Compared with the prior art, the invention has the following advantages:
1. the sludge positive and negative pressure dewatering system mainly comprises a positive pressure applying device and a negative pressure drainage device, and is used for dewatering sludge in a positive pressure and negative pressure combined mode, namely, the sludge is continuously solidified under the action of positive and negative pressure by combining vacuum preloading with positive pressure, and positive pressure application is greater than atmospheric pressure load, so that the problem of vacuum preloading pressure limitation is solved, the cost is reduced, the dewatering effect is good, and the efficiency is high.
3. The sludge positive and negative pressure dehydration system adopts the filling soil engineering bags to contain the sludge, and the water in the sludge can conveniently permeate into the drain pipe in the dehydration process due to the high strength, good toughness and good water permeability of the soil engineering pipe bags. And after the dehydration is finished, the geotextile tube bags are convenient to transport and can be used for bagging cofferdams or garbage dam materials.
4. According to the sludge positive-negative pressure dehydration system, the drainage plate assembly is arranged between the filling soil bags, pressure can be applied by the self weight of the filling soil bags, a relatively sealed space is provided for vacuum negative pressure, and the drainage plates in the drainage plate assembly can be reused and are not easy to block.
Drawings
FIG. 1 is a schematic diagram showing the structure of a sludge positive-negative pressure dewatering system according to the present invention.
Fig. 2 is a cross-sectional view at a-a in fig. 1.
Fig. 3 is a schematic structural view of the drain board of the present invention.
Fig. 4 is a schematic view of the vacuum strainer of the present invention.
Wherein, 1 is sealed box, 2 is pneumatic valuator, 3 is air compressor, 4 is first pipeline, 5 is for filling geotechnological bag, 6 is the vacuum jet pump, 7 is drain bar subassembly, 71 is the filter membrane section, 72 is the separation section, 73 is the joint, 8 is the vacuum strainer, 81 is outer connecting pipe, 82 is the interconnection pipe, 83 is the check valve, 9 is water gas separator, 91 is the water level monitoring scale, 92 is the vacuum pressure test table, 93 is the drain valve, 10 second pipelines.
Detailed Description
The invention is further illustrated by the following figures and examples.
The sludge positive-negative pressure dewatering system shown in fig. 1 comprises a positive pressure applying device and a negative pressure drainage device, wherein the positive pressure applying device comprises a sealed box body, a pneumatic valuator and an air compressor, the air compressor is connected with the air compressor through a first pipeline, the pneumatic valuator is arranged on the first pipeline, and a filling geotextile bag is arranged in the sealed box body; the negative pressure drainage device comprises a vacuum jet pump, a drainage plate assembly, a vacuum filter pipe and a water-gas separator, wherein the drainage plate assembly is arranged in the sealed box body and is connected with the vacuum filter pipe, the vacuum filter pipe is connected with the water-gas separator through a second pipeline, and the water-gas separator is connected with the vacuum jet pump. Specifically, the sealed box body is made of steel, and the side face of the sealed box body is provided with an openable side door so as to be convenient to take out or fill the filled geotechnical bags; meanwhile, the bottom of the sealed box body is provided with universal wheels for convenient movement. The pneumatic valuator can ensure that the air compressor applies accurate positive pressure to the sealed box body so as to improve the dehydration effect and the dehydration efficiency. The water-gas separator is used for stabilizing vacuum pressure and storing sewage, so that the vacuum pumping work of the vacuum jet pump is ensured, and sewage discharged from the sealed box body can be received. When the device works, the vacuum jet pump is sequentially connected with the water-gas separator, the vacuum water filter pipe and the drainage plate assembly, and when the vacuum jet pump runs, negative load is applied, negative pressure is uniformly transmitted into the sealing box body, so that water in the geotechnical pipe bag is accelerated to flow to the drainage plate for continuous drainage.
The water-gas separator is provided with a water level monitoring scale for monitoring the water level in real time, a vacuum pressure test meter for monitoring the applied vacuum degree and a drain valve for draining water. The structure is simple, and the water-gas separator can further work effectively.
The drainage plate assembly comprises a plurality of drainage plates which are uniformly distributed in a row in the sealed box body; the drain bar includes filter membrane section and separation section, the separation section is connected with the rear end of filter membrane section, the front end of filter membrane section is connected with the vacuum strainer through connecting. Specifically, as shown in fig. 1 and 2, a plurality of drainage plates are arranged in a row and are uniformly distributed between two layers of filling geotextile bags, wherein the filter membrane section is used as a drainage channel and transmits vacuum pressure; the separation section is used for separating vacuum pressure, and the vacuum pressure is prevented from diffusing from the rear end, so that the vacuum degree is reduced. The drainage plates are uniformly arranged between the two layers of the filling soil engineering bags, and water drained from the filling soil engineering bags can be sufficiently drained out of the sealed box body
The vacuum water filter pipe comprises inner connecting pipes with the same number of outer connecting pipes and water discharging plates, the joint of each water discharging plate is connected with one end of the corresponding inner connecting pipe, the other end of each inner connecting pipe is connected with the outer connecting pipe, and the outer connecting pipe is connected with the water-gas separator through a second pipeline; the inner connecting pipe is provided with a one-way valve. The joint of the drainage plate is connected with the inner connecting pipe of the vacuum water filtering pipe through an internal thread, and the outer connecting pipe of the vacuum water filtering pipe is connected with the water-gas separator so as to ensure the connection tightness of the components.
The filling geotextile bags are provided with two layers, and the drainage plate component is arranged between the two layers of filling geotextile bags. The drainage plate is arranged between the two layers of the filling soil engineering bags, and the filling soil engineering pipe bags can be compressed to form a sealed space when being full of the filling soil engineering pipe bags, so that vacuum suction is formed, and the drainage of moisture is further accelerated.
And a flat car for bearing the filling geotextile bag is arranged in the sealing box body. Specifically, the flatbed is provided with on the bottom plate in the seal box body, flatbed and bottom plate sliding connection to the geotechnological bag that fills that will put on the flatbed takes out conveniently.
And a pressure sensor for monitoring the pressure in the box is arranged on the top cover of the sealed box body. The pressure sensor can monitor the pressure value in the sealed box body in real time, so that the pressure in the sealed box body is further accurately controlled.
The positive and negative sludge pressure dewatering method adopts the positive and negative sludge pressure dewatering system and comprises the following steps:
s1, filling the sludge into the filling geotextile bags, and filling the filling geotextile bags filled with the sludge into a sealed box body; specifically, after the whole sludge positive-negative pressure dehydration system is transported to the site, a side door of a sealed box body is opened, a filling geotechnical bag to be filled is placed on a pulled flat car, and the filling geotechnical bag is filled with sludge through a filling opening; placing a drainage plate assembly on the surface layer of the first layer of the filling geotechnical pipe bag, wherein the drainage plate assembly is connected with a water-gas separator through a vacuum filter pipe and a first pipeline; then placing the second layer of the filling soil engineering pipe bags, and filling the second layer of the filling soil engineering pipe bags with sludge;
s2, starting the vacuum jet pump, and vacuumizing the sealed box body through the drainage plate assembly to accelerate the discharge of water in the sludge filled in the geotextile bags;
s3, keeping the vacuum jet pump running and intermittently running the air compressor; specifically, positive pressure is intermittently applied through the air compressor, positive and negative staggering can be formed with continuous negative pressure, moisture in the reinforced soil body is promoted to be discharged in an accelerated mode, and dehydration time is shortened. Wherein the intermittent time is determined according to the soil property. .
S4, after the dehydration of the sludge in the sealed box body is finished, taking out the sludge and filling the soil engineering bags, and repeating the steps S1-S3.
When the air compressor runs intermittently, the pressure value in the sealed box body is 0-500 kPa, and the pressure value is selected according to soil texture and expected reinforcement effect during specific implementation.
The dewatered bagged sludge can be refilled into a landfill, or used as dam body materials of a separation dam, a garbage blocking dam and the like of the landfill, or used as bank protection and embankment filling materials.
The above detailed description is a preferred embodiment of the present invention, and is not intended to limit the present invention, and any other modifications or equivalent substitutions that do not depart from the spirit of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. Sludge positive negative pressure's dewatering system, its characterized in that: the device comprises a positive pressure applying device and a negative pressure drainage device, wherein the positive pressure applying device comprises a sealed box body, a pneumatic valuator and an air compressor, the air compressor is connected with the air compressor through a first pipeline, the pneumatic valuator is arranged on the first pipeline, and a filling geotextile bag is arranged in the sealed box body; the negative pressure drainage device comprises a vacuum jet pump, a drainage plate assembly, a vacuum filter pipe and a water-gas separator, wherein the drainage plate assembly is arranged in the sealed box body and is connected with the vacuum filter pipe, the vacuum filter pipe is connected with the water-gas separator through a second pipeline, and the water-gas separator is connected with the vacuum jet pump.
2. The sludge positive and negative pressure dewatering system according to claim 1, wherein: the water-gas separator is provided with a water level monitoring scale for monitoring the water level in real time, a vacuum pressure test meter for monitoring the applied vacuum degree and a drain valve for draining water.
3. The sludge positive and negative pressure dewatering system according to claim 1, wherein: the drainage plate assembly comprises a plurality of drainage plates which are uniformly distributed in a row in the sealed box body; the drain bar includes filter membrane section and separation section, the separation section is connected with the rear end of filter membrane section, the front end of filter membrane section is connected with the vacuum strainer through connecting.
4. The sludge positive and negative pressure dewatering system according to claim 3, wherein: the vacuum water filtering pipes comprise inner connecting pipes with the same number of outer connecting pipes and water discharging plates, joints of the water discharging plates are connected with one ends of the corresponding inner connecting pipes, the other ends of the inner connecting pipes are connected with the outer connecting pipes, and the outer connecting pipes are connected with the water-gas separator through second pipelines; the inner connecting pipe is provided with a one-way valve.
5. The sludge positive and negative pressure dewatering system according to claim 1, wherein: the filling geotextile bags are provided with two layers, and the drainage plate component is arranged between the two layers of filling geotextile bags.
6. The sludge positive and negative pressure dewatering system according to claim 1, wherein: and a flat car for bearing the filling geotextile bag is arranged in the sealing box body.
7. The sludge positive and negative pressure dewatering system according to claim 1, wherein: and a pressure sensor for monitoring the pressure in the box is arranged on the top cover of the sealed box body.
8. The method for dehydrating the sludge under positive and negative pressure is characterized in that the system for dehydrating the sludge under positive and negative pressure, which is disclosed by any one of claims 1 to 7, is adopted, and comprises the following steps:
s1, filling the sludge into the filling geotechnical bags, and filling the filling geotechnical bags filled with the sludge into a sealed box body;
s2, starting the vacuum jet pump, and vacuumizing the sealed box body through the drainage plate assembly to accelerate the discharge of water in the sludge filled in the geotextile bags;
s3, keeping the vacuum jet pump running and intermittently running the air compressor;
s4, after the dehydration of the sludge in the sealed box body is finished, taking out the sludge and filling the soil engineering bags, and repeating the steps S1-S3.
9. The method for dehydrating sludge under positive and negative pressure according to claim 8, wherein: when the air compressor runs intermittently, the pressure value in the sealed box body is 0-500 kPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210634236.5A CN115057598A (en) | 2022-06-07 | 2022-06-07 | Sludge positive and negative pressure dewatering system and method |
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| CN202210634236.5A CN115057598A (en) | 2022-06-07 | 2022-06-07 | Sludge positive and negative pressure dewatering system and method |
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