CN115304235A - Sludge dewatering system and application thereof - Google Patents
Sludge dewatering system and application thereof Download PDFInfo
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- CN115304235A CN115304235A CN202210973220.7A CN202210973220A CN115304235A CN 115304235 A CN115304235 A CN 115304235A CN 202210973220 A CN202210973220 A CN 202210973220A CN 115304235 A CN115304235 A CN 115304235A
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- 239000010802 sludge Substances 0.000 title claims abstract description 247
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000001035 drying Methods 0.000 claims description 58
- 239000010865 sewage Substances 0.000 claims description 21
- 230000018044 dehydration Effects 0.000 claims description 20
- 238000006297 dehydration reaction Methods 0.000 claims description 20
- 239000003814 drug Substances 0.000 claims description 17
- 239000000706 filtrate Substances 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 9
- 230000003139 buffering effect Effects 0.000 claims description 8
- 238000007791 dehumidification Methods 0.000 claims description 8
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 239000008399 tap water Substances 0.000 claims description 5
- 235000020679 tap water Nutrition 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 11
- 238000005265 energy consumption Methods 0.000 abstract 1
- 208000005156 Dehydration Diseases 0.000 description 15
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004332 deodorization Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 206010016807 Fluid retention Diseases 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
-
- 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a sludge dewatering system and application thereof. The system is including folding spiral shell dewatering system, belt dewatering system and low temperature mummification system, folds spiral shell dewatering system and goes out mud and get into belt dewatering system through the middle buffer storehouse of 1#, and belt dewatering system goes out mud and gets into low temperature mummification system through the middle buffer storehouse of 2#, and low temperature mummification system goes out mud and gets into and carry out after doing the mud feed bin and keep in. The sludge inlet can be concentrated tank sludge with the water content of about 99-97% or centrifugally dewatered sludge with the water content of about 80-85%, and the water content of the discharged sludge is adjustable, so that the method has the advantages of flexible process, high adjustability and strong adaptability. The invention can obviously improve the operation flexibility of the sludge treatment device, improve the sludge dewatering efficiency and reduce the operation energy consumption by combining and utilizing the optimal high-efficiency sections of different dewatering systems.
Description
Technical Field
The invention belongs to the technical field of sludge dewatering treatment, and particularly relates to a sludge reduction system and application thereof.
Background
Along with the increase of the discharge amount of urban sewage and the continuous improvement of the sewage treatment rate in China, the sludge output of urban sewage treatment plants is gradually increased. The discharge amount of urban domestic sewage is increased from 510.3 hundred million tons to about 550.5 hundred million tons in 2014-2020. In general, a sewage treatment plant can treat 1 thousand tons of domestic sewage to produce 5 to 8 tons of sludge with water content of 80 percent. The yield is calculated according to the unit yield of 6.5 tons, and the yield of domestic sludge in China is maintained to be more than 3500 million tons in 2014-2020 years.
The water content of the sludge in the concentration tank of the sewage plant is about 98 percent, and the water content of the sludge produced by the common centrifugal dehydration process is about 80 percent. Dewatering sludge to reduce its water content is an effective method for reducing sludge volume and raising sludge heat value.
The stacked screw type sludge dewatering machine is formed by mutually stacking a fixed ring and a movable ring, and a screw shaft penetrates through a filtering main body formed by the fixed ring and the movable ring. When the stacked screw type sludge dewatering machine operates, sludge enters the filter cylinder from the feed inlet and is pushed by the spiral shaft rotary sheets to move towards the discharge port, the screw pitch between the spiral shaft rotary sheets is gradually reduced, so that the pressure applied to the sludge is continuously increased, dewatering is started under the action of pressure difference, filtrate is discharged from filter gaps formed by the fixed ring and the movable ring, and meanwhile, the filter gaps are cleaned to prevent blockage by virtue of a self-cleaning function between the fixed plate and the movable plate, and mud cakes are discharged from the discharge port under the pushing action of the spiral shaft after being fully dewatered.
The belt type dewatering system mainly comprises the following two steps: (1) sludge modification, namely adding a medicament into a sludge modification mixer through a medicament adding system to be uniformly mixed and reacted with sludge, so as to change the physical and chemical properties of the sludge. In the sludge modification mixer, the sludge and the medicament are quickly and uniformly mixed. The medicament has the functions of destroying cell walls and destabilizing colloid, thereby playing the role of reducing the water retention of the sludge and converting the combined water into destabilized water; the internal porosity of the sludge is improved, and the distribution and dehydration in the subsequent deep dehydration stage are facilitated. (2) And (3) carrying the sludge subjected to sludge dewatering and modification to a belt type deep dewatering machine, and realizing deep dewatering of the sludge under the squeezing action of a high-pressure belt type machine, wherein the sludge subjected to deep dewatering forms a porous flaky mud cake with the thickness of 5-10mm, which is far lower than the mud cake thickness (20-30 mm) of the high-pressure plate-frame type sludge deep dewatering machine.
The low-temperature drying process is to use a dehumidification heat pump to condense, dehumidify and dry the sludge by hot air circulation; the dehumidifying heat pump is used as a power source of the drying machine, and the purpose of energy conservation is achieved without adding an additional heat source. The drying by the dehumidifying heat pump is to utilize a refrigerating system to cool the wet air from the drying chamber, and to dehumidify and simultaneously recover the latent heat of moisture condensation to heat the air by the heat pump principle to achieve the purpose of drying materials. The dehumidifying heat pump combines dehumidifying (dehumidifying and drying) and heating pumps (energy recovery), and energy is recycled in the drying process.
The three main processes have respective optimal dehydration high-efficiency sections, and the invention organically combines the three processes, thereby improving the efficiency of sludge dehydration treatment and reducing the operation cost.
Disclosure of Invention
The invention provides a sludge dewatering system and application thereof, and the system can realize organic combination of technologies such as spiral-stacked dewatering, belt-type dewatering and low-temperature drying dewatering, and achieves the purposes of remarkably improving the treatment efficiency of sludge dewatering and reducing the operation cost.
The technical solution of the present invention is described in detail below.
In order to achieve the purpose of the invention, the invention adopts a technical scheme that:
the invention provides a sludge dewatering system which comprises a centrifugal pump, a homogenizing tank, a wet sludge bin, a screw pump, an integrated dosing system, a screw-stacked dewatering machine, a No. 1 intermediate buffer bin, a conditioner system, a sludge conditioner, a belt dewatering machine, a No. 2 intermediate buffer bin, a low-temperature drying system and a dry sludge bin; the integrated chemical feeding system is connected with the screw-stacking dehydrator through a screw pump, the outlet end of the homogenizing pool is connected with the sludge inlet end of the screw-stacking dehydrator through the screw pump, the sludge outlet end of the screw-stacking dehydrator is connected with the inlet end of a No. 1 middle buffer storage bin, the outlet end of the No. 1 middle buffer storage bin is connected with the sludge inlet end of the sludge conditioner through a screw conveyor, the outlet end of a wet sludge bin is connected with the wet sludge inlet end of the sludge conditioner through the screw pump, a tap water pipeline is connected with a conditioner system, the conditioner outlet end of the conditioner system is connected with the conditioner inlet end of the sludge conditioner, the sludge outlet end of the sludge conditioner is connected with the sludge inlet end of the belt dehydrator, the sludge outlet end of the belt dehydrator is connected with the sludge inlet end of a No. 2 middle buffer storage bin through a lifting scraper conveyor, the sludge outlet end of the No. 2 middle buffer storage bin is connected with the sludge inlet end of the low-temperature drying system through the screw conveyor, and the sludge outlet end of the low-temperature system is connected with the sludge inlet end of the dry sludge bin through the lifting scraper conveyor.
The filter-liquid outlet end of the screw-stacking dehydrator, the filter-liquid outlet end of the belt-type dehydrator and the condensed water discharge end of the low-temperature drying system are respectively connected with a sewage well.
Further preferred scheme is, the centrifugal pump is screw centrifugal pump or open impeller centrifugal pump.
Further preferred scheme is, on vertical arrangement, fold spiral shell hydroextractor and arrange the upper strata in belt dewatering machine shop, fold spiral shell hydroextractor ejection of compact and can utilize gravity to flow automatically and get into the middle buffering storehouse of 1 #.
The belt type dehydrator is further preferably provided with a flushing system and an air compressor system, and the water used by the flushing system is plant area reuse water; the air compressor system is mainly used for tensioning and rectifying the filter belt; the low-temperature drying system is provided with a circulating cooling system, and cooling water is plant area reuse water.
Further preferred scheme is, it all sets up the sealed cowling to fold spiral shell hydroextractor, belt dewaterer, low temperature mummification system, wet sludge storage bin and dry sludge storage bin, the sealed cowling is connected negative pressure air exhaust device, carries out the negative pressure deodorization of bleeding.
Further, the invention provides an application of the sludge dewatering system, the sludge dewatering system is adopted to treat sludge with the water content of 99-97% by mass, and the method comprises the following steps:
s1: sludge with the water content of 99-97 percent from the concentration tank enters a homogenizing tank, and enters a screw-stacking dehydrator from an outlet end of the homogenizing tank through a screw pump; running water and a medicament enter a screw-stacked dehydrator through a screw pump, sludge and the medicament are fully mixed in a mixing box in the screw-stacked dehydrator, and the mixed substances are pushed and extruded by a screw shaft rotating sheet of the screw-stacked dehydrator to obtain sludge with the water content of about 80 percent by mass and enter a No. 1 middle buffer bin;
s2: sludge with the water content of about 80% in the No. 1 intermediate buffering bin is conveyed to a sludge conditioner through a screw conveyor, a medicament from a conditioner system enters the sludge conditioner, the sludge and the medicament are mixed and then enter a belt type dehydrator to be dehydrated under the squeezing action of the high-pressure belt type dehydrator, and the sludge discharged from the belt type dehydrating system enters the No. 2 intermediate buffering bin through a lifting scraper conveyor;
s3:2# intermediate buffer storage bin sludge enters a low-temperature drying system through screw conveying, a dehumidification heat pump is used for condensing, dehumidifying and drying the sludge through hot air circulation, sludge with a certain water content is obtained after dehydration, and the sludge enters a dry sludge bin through a lifting scraper conveyor and is temporarily stored and then transported outside.
Further preferably, a spiral centrifugal pump or an open impeller centrifugal pump is adopted to convey the sludge in the concentration tank with the water mass fraction of 99-97% into the homogenizing tank.
The filter liquid discharged by the screw-overlapping dehydrator and the belt dehydrator is respectively sent to a sewage well, and the condensed water discharged by the low-temperature drying system is sent to the sewage well.
In a further preferable scheme, in the low-temperature drying system, the dehumidification heat pump is used for condensing, dehumidifying and drying the sludge by adopting hot air circulation, and the mass fraction of the water content in the sludge obtained after dehydration is 50-10%. The mass fraction of the water content of the sludge discharged from the belt type dewatering system is 68-72% so as to be beneficial to the slicing and forming of the sludge of the low-temperature drying system.
Further, the invention also provides another application of the sludge dewatering system, and the sludge dewatering system is used for treating sludge with the water content of 80-85% by mass, and comprises the following steps:
s1: sludge with the water content of 80-85% enters a wet sludge bin for temporary storage, is conveyed to a sludge conditioner through a sludge screw pump and is mixed with a medicament from a conditioner system, and then enters a belt type dehydrator to be dehydrated under the squeezing action of a high-pressure belt type machine, and sludge discharged from the belt type dehydrating system is conveyed to enter a No. 2 intermediate buffer bin through a lifting scraper conveyor;
s2: sludge from the No. 2 intermediate buffer bin enters a low-temperature drying system through a screw, and a dehumidification heat pump is used for condensing, dehumidifying and drying the sludge by adopting hot air circulation to finish sludge dewatering; sludge with certain water content is obtained after dehydration, and then enters a dry sludge bin through a lifting scraper conveyor for temporary storage and then is transported outside.
Further preferably, the filtrate discharged by the belt type dewatering machine is sent to a sewage well, and the condensed water discharged by the low-temperature drying system is sent to the sewage well.
Further preferably, in the low-temperature drying system, the dehumidifying heat pump is used for condensing, dehumidifying and drying the sludge by adopting hot air circulation, and the dewatered sludge contains 50-10% of water by mass. The mass fraction of the water content of the sludge discharged from the belt type dewatering system is 68-72% so as to be beneficial to the slicing and forming of the sludge of the low-temperature drying system.
Compared with the prior art, the invention has the beneficial effects that:
(1) The sludge dewatering system provided by the invention comprises a centrifugal pump, a wet sludge bin, a sludge conveying screw pump, an integrated dosing system, a screw-stacking dewatering machine, a No. 1 intermediate buffer bin, a conditioner system, a sludge conditioning machine, a belt dewatering machine, a No. 2 intermediate buffer bin, a low-temperature drying system, a dry sludge bin and the like, and technologies such as screw-stacking dewatering, belt dewatering, low-temperature drying dewatering and the like are organically combined to be in respective process high-efficiency sections, so that the sludge dewatering treatment efficiency can be effectively improved, and the operation cost can be reduced;
(2) The sludge dewatering system provided by the invention adopts the spiral or open impeller centrifugal pump to convey the concentrated sludge, so that the problem of easy blockage in the sludge conveying process is solved;
(3) According to the sludge dewatering system provided by the invention, in order to ensure that the three processes are connected tightly, the intermediate cache bins are arranged between the process sections, so that the problem that the processing capacities of the running equipment cannot be matched well is solved;
(4) The application of the sludge dewatering system provided by the invention can preferably control the mass fraction of the discharged sludge of the belt type dewatering machine to be about 70% in order to ensure that the low-temperature drying process section sludge slitting forming machine is favorable for operation, and the problem of uneven slitting forming of the low-temperature drying process section sludge is solved;
(5) In order to ensure that the odor of the sludge can be effectively controlled in the dehydration process, the sludge dehydration system provided by the invention adopts the steps of covering or sealing equipment such as the screw-overlapping dehydration machine, the belt-type dehydration machine, the low-temperature drying system, the sludge bin and the like and then performing negative-pressure air extraction, so that the problem of odor overflow in the sludge treatment process is solved;
(6) The sludge dewatering system and the application thereof provided by the invention can effectively treat municipal sludge, and compared with the traditional single sludge dewatering mode, the sludge dewatering system can obviously improve the operation flexibility of the system and enhance the adaptability of the process system to the water content of the incoming sludge.
Drawings
FIG. 1 is a schematic view of a sludge dewatering system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the concept of the invention. All falling within the scope of the present invention.
Example (b):
referring to fig. 1, a sludge dewatering system comprises a centrifugal pump, a homogenizing tank, a wet sludge bin, a screw pump, an integrated dosing system, a screw-stacked dewatering machine, a No. 1 intermediate buffer bin, a conditioner system, a sludge conditioner, a belt dewatering machine, a No. 2 intermediate buffer bin, a low-temperature drying system, a dry sludge bin and the like.
The integrated chemical feeding system is connected with the screw-stacking dehydrator through a screw pump, the outlet end of the homogenizing pool is connected with the sludge inlet end of the screw-stacking dehydrator through the screw pump, the sludge outlet end of the screw-stacking dehydrator is connected with the inlet end of a No. 1 middle buffer bin, the outlet end of the No. 1 middle buffer bin is connected with the sludge inlet end of the sludge conditioner through a screw conveyer, the outlet end of a wet sludge bin is connected with the wet sludge inlet end of the sludge conditioner through the screw pump, a tap water pipeline is connected with a conditioner system, the conditioner outlet end of the conditioner system is connected with the conditioner inlet end of the sludge conditioner, the sludge outlet end of the sludge conditioner is connected with the sludge inlet end of a belt dehydrator, the sludge outlet end of the belt dehydrator is connected with the sludge inlet end of a No. 2 middle buffer bin through a lifting scraper conveyer, the sludge outlet end of the No. 2 middle buffer bin is connected with the sludge inlet end of a low-temperature drying system through the screw conveyer, and the sludge outlet end of the low-temperature system is connected with the sludge inlet end of a dry sludge bin through the lifting scraper conveyer; the filtrate outlet end of the spiral-stacked dehydrator, the filtrate outlet end of the belt-type dehydrator and the condensed water discharge end of the low-temperature drying system are respectively connected with the sewage well.
The sludge dewatering system is arranged vertically, and the screw-overlapping dewatering machine is arranged in a workshop on the upper layer of the belt-type dewatering machine. The belt type dehydrator is provided with a flushing system, and the water used by the flushing system is plant reuse water. The low-temperature drying system is provided with a circulating cooling system, and cooling water is plant area reuse water. The spiral-stacked dehydrator, the belt dehydrator, the low-temperature drying system, the wet sludge bin and the dry sludge bin are all provided with a negative-pressure air-exhaust sealing cover, and negative-pressure air-exhaust deodorization can be carried out. The buffer volumes of the 1# intermediate buffer bin and the 2# intermediate buffer bin are designed to be effectively connected with a subsequent processing system.
The application 1, adopting the sludge dewatering system of the invention to treat the sludge with the water content of 98 percent by mass, comprises the following steps:
s1: fold spiral dewatering system: sludge with the water mass fraction of about 98% from the concentration tank enters a homogenizing tank through a screw centrifugal pump or an open impeller centrifugal pump, and enters a screw-stacking dehydrator through a screw pump from an outlet end of the homogenizing tank; tap water and a medicament (PAM, the mass concentration is 0.1 percent, the dosing amount is 3-5 per thousand in mass percentage) enter a spiral shell stacking dehydrator through a screw pump, sludge and the medicament are fully mixed in a mixing box in the spiral shell stacking dehydrator, the mixed substances are pushed and extruded by a spiral shaft blade of the spiral shell stacking dehydrator to obtain sludge with the water content of about 80 percent in mass percentage, and the sludge enters a No. 1 middle buffer bin. And respectively sending filtrate discharged by the spiral-stacked dehydrator to a sewage well.
S2: a belt dewatering system: sludge with the water content of about 80% in the No. 1 intermediate buffering bin is conveyed to a sludge conditioner through a screw conveyor, agents (combined salts, the mass concentration is 20% -30%, and the adding amount is 1.5%) from a conditioner system enter the sludge conditioner through a diaphragm metering pump, the sludge and the agents are mixed and then enter a belt type dehydrator, dehydration is carried out under the squeezing action of a high-pressure belt type machine, the water content of the dehydrated sludge is about 70%, and the sludge enters the No. 2 intermediate buffering bin through a lifting scraper conveyor. And sending the filtrate discharged by the belt type dehydrator to a sewage well.
S3: a low-temperature drying and dewatering system: sludge with the moisture content of 70% in the No. 2 intermediate buffering bin enters a low-temperature drying system through spiral conveying, a dehumidifying heat pump is used for dehumidifying and drying the sludge through hot air circulation condensation (the standard drying return air temperature is 45-56 ℃, the air supply temperature is 60-75 ℃), the sludge with the moisture content of about 50% (the moisture content of the discharged sludge is adjustable) is obtained after dehydration, and the sludge enters a dry sludge bin through a lifting scraper conveyor and is transported out after temporary storage. And sending the condensed water discharged by the low-temperature drying system to a sewage well.
The application 2 of the sludge dewatering system provided by the invention for treating sludge with water content of 80-85% by mass comprises the following steps:
s1: a belt dewatering system: the sludge with the water content of 80-85% enters a wet sludge bin for temporary storage, is conveyed to a sludge conditioner through a sludge screw pump and is mixed with a medicament (combined salt, the mass concentration is 20-30%, and the dosage mass fraction is 1.5%) from a conditioner system, then enters a belt type dehydrator, is dehydrated under the squeezing action of a high-pressure belt type machine, the water content of the dehydrated sludge is about 70%, and then is conveyed into a No. 2 intermediate buffer bin through a lifting scraper conveyor. And sending the filtrate discharged by the belt type dehydrator to a sewage well.
S2: a low-temperature drying and dewatering system: sludge with the water content of 70 percent by mass from the No. 2 intermediate buffer bin enters a low-temperature drying system through a screw, and the sludge is subjected to hot air circulating condensation, dehumidification and drying by a dehumidification heat pump (the standard drying return air temperature is 45-56 ℃, and the air supply temperature is 60-75 ℃) to complete sludge dehydration. And dewatering to obtain sludge with water content of 50 wt% (adjustable water content of sludge), and conveying to dry sludge bin via lifting scraper conveyer for temporary storage. And sending the condensed water discharged by the low-temperature drying system to a sewage well.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (12)
1. A sludge dewatering system is characterized by comprising a centrifugal pump, a homogenizing tank, a wet sludge bin, a screw pump, an integrated dosing system, a screw-stacked dewatering machine, a No. 1 intermediate buffer bin, a conditioner system, a sludge conditioner, a belt type dewatering machine, a No. 2 intermediate buffer bin, a low-temperature drying system and a dry sludge bin; the integrated dosing system is connected with a screw-stacked dewatering machine through a screw pump, a sludge outlet end of a concentration tank is connected with an inlet end of a homogenizing tank through a centrifugal pump, an outlet end of the homogenizing tank is connected with a sludge inlet end of the screw-stacked dewatering machine through the screw pump, a sludge outlet end of the screw-stacked dewatering machine is connected with an inlet end of a No. 1 middle buffer storage bin, an outlet end of the No. 1 middle buffer storage bin is connected with a sludge inlet end of a sludge conditioner through a screw conveyor, an outlet end of a wet sludge storage bin is connected with a wet sludge inlet end of the sludge conditioner through the screw pump, a tap water pipeline is connected with a conditioner system, a conditioner outlet end of the conditioner system is connected with a conditioner inlet end of the sludge conditioner, a sludge outlet end of the sludge conditioner is connected with a sludge inlet end of the belt dewatering machine, a sludge outlet end of the belt dewatering machine is connected with a sludge inlet end of the No. 2 middle buffer storage bin through a lifting scraper conveyor, a sludge outlet end of the No. 2 middle buffer storage bin is connected with a sludge inlet end of a low-temperature drying system through the screw conveyor, and a sludge outlet end of the low-temperature drying system is connected with a sludge inlet end of a lifting scraper conveyor.
2. The sludge dewatering system of claim 1, wherein a filtrate outlet end of the spiral-stacked dewaterer, a filtrate outlet end of the belt dewaterer and a condensate water discharge end of the low-temperature drying system are respectively connected with an inlet end of a sewage well.
3. The sludge dewatering system of claim 1, wherein the centrifugal pump is a screw centrifugal pump or an open impeller centrifugal pump.
4. The sludge dewatering system of claim 1, wherein the screw-stack dewaterer is arranged on an upper level of the belt dewatering plant in a vertical arrangement.
5. The sludge dewatering system according to claim 1, wherein the belt dewaterer is provided with a flushing system and an air compressor system, and the water used by the flushing system is plant area reuse water; the low-temperature drying system is provided with a circulating cooling system, and a cooling water source is plant reuse water.
6. The sludge dewatering system of claim 1, wherein the spiral-wound water extractor, the belt water extractor, the low-temperature drying system, the wet sludge bin and the dry sludge bin are provided with sealing covers, and the sealing covers are connected with a negative pressure air extractor.
7. The application of the sludge dewatering system according to claim 1, wherein the sludge dewatering system is used for treating sludge with water content of 99% -97% by mass, and the application comprises the following steps:
s1: sludge with the water content of 99-97 percent from the concentration tank enters a homogenizing tank, and enters a screw-stacking dehydrator from an outlet end of the homogenizing tank through a screw pump; tap water and a medicament enter a spiral shell stacking dehydrator through a screw pump, sludge and the medicament are fully mixed in a mixing box in the spiral shell stacking dehydrator, and the mixed substances are pushed and extruded by a spiral plate of the spiral shell stacking dehydrator to obtain sludge with the water content of about 80 percent and enter a No. 1 middle buffer bin;
s2: sludge with the water content of about 80% by mass in the No. 1 intermediate buffering bin is conveyed to a sludge conditioner through a screw conveyor, a medicament from a conditioner system enters the sludge conditioner, the sludge and the medicament are mixed and then enter a belt type dehydrator, dehydration is carried out under the squeezing action of a high-pressure belt type machine, and sludge discharged from the belt type dehydration system enters the No. 2 intermediate buffering bin through a lifting scraper conveyor;
s3:2# intermediate buffer storage bin sludge enters a low-temperature drying system through screw conveying, a dehumidification heat pump is used for condensing, dehumidifying and drying the sludge through hot air circulation, sludge with a certain water content is obtained after dehydration, and the sludge enters a dry sludge bin through a lifting scraper conveyor and is temporarily stored and transported outside.
8. The application of the sludge dewatering system according to claim 1, wherein the sludge dewatering system is used for treating sludge with water content of 80-85% by mass, and the application comprises the following steps:
s1: sludge with the water content of 80-85% by mass enters a wet sludge bin for temporary storage, is conveyed to a sludge conditioner through a sludge screw pump and is mixed with a medicament from a conditioner system, then enters a belt type dehydrator, dehydration is completed under the squeezing action of a high-pressure belt type machine, sludge discharged from the belt type dehydrator is conveyed through a lifting scraper conveyor and enters a No. 2 intermediate buffer bin;
s2: sludge from the No. 2 intermediate buffer bin enters a low-temperature drying system through a screw, and a dehumidification heat pump is used for condensing, dehumidifying and drying the sludge by adopting hot air circulation to finish sludge dewatering; sludge with certain water content is obtained after dehydration, and then enters a dry sludge bin through a lifting scraper conveyor for temporary storage and then is transported outside.
9. The use of the sludge dewatering system according to claim 7, wherein the filtrates from the screw-stacked dewatering machine and the belt-type dewatering machine are delivered to a sewage well, and the condensed water from the low-temperature drying system is delivered to the sewage well.
10. The use of a sludge dewatering system according to claim 8, characterised in that filtrate from the belt dewaterer is sent to a bilge well and condensate from the low temperature drying system is sent to the bilge well.
11. The application of the sludge dewatering system according to claim 7 or 8, wherein the low-temperature drying system is characterized in that a dehumidifying heat pump is used for condensing, dehumidifying and drying the sludge by adopting hot air circulation, and the mass fraction of the water content of the sludge obtained after dewatering is 50-10%.
12. Use of a sludge dewatering system according to claim 7 or 8, characterised in that the mass fraction of water content of the sludge from the belt dewatering system is 68-72%.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210973220.7A CN115304235A (en) | 2022-08-15 | 2022-08-15 | Sludge dewatering system and application thereof |
| PCT/CN2023/112514 WO2024037444A1 (en) | 2022-08-15 | 2023-08-11 | Sludge dewatering system and use thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210973220.7A CN115304235A (en) | 2022-08-15 | 2022-08-15 | Sludge dewatering system and application thereof |
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| CN115304235A true CN115304235A (en) | 2022-11-08 |
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| CN202210973220.7A Pending CN115304235A (en) | 2022-08-15 | 2022-08-15 | Sludge dewatering system and application thereof |
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| WO (1) | WO2024037444A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024037444A1 (en) * | 2022-08-15 | 2024-02-22 | 上海市政工程设计研究总院（集团）有限公司 | Sludge dewatering system and use thereof |
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| CN115304235A (en) * | 2022-08-15 | 2022-11-08 | 上海市政工程设计研究总院（集团）有限公司 | Sludge dewatering system and application thereof |
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- 2022-08-15 CN CN202210973220.7A patent/CN115304235A/en active Pending
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