CN111908766A - Rapid residual sludge dewatering and drying system - Google Patents
Rapid residual sludge dewatering and drying system Download PDFInfo
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- CN111908766A CN111908766A CN202010636717.0A CN202010636717A CN111908766A CN 111908766 A CN111908766 A CN 111908766A CN 202010636717 A CN202010636717 A CN 202010636717A CN 111908766 A CN111908766 A CN 111908766A
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- tank
- mud scraping
- pressure
- drying
- excess sludge
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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
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
- C02F11/131—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating using electromagnetic or ultrasonic waves
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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
- C02F11/004—Sludge detoxification
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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
Abstract
The invention discloses a rapid dewatering and drying system for excess sludge, wherein after the cell structure in the excess sludge is subjected to steam modulation, high temperature and high pressure, pressure release and bursting, due to protein denaturation and cell structure rupture, the sludge drying is realized, and meanwhile, the harmful microorganisms or viruses can be effectively killed.
Description
Technical Field
The invention belongs to the field of sludge treatment, and particularly relates to a rapid residual sludge dewatering and drying system.
Background
The water content of the excess sludge is high (generally more than 95 percent), the volume is large, the excess sludge is not beneficial to storage, transportation and consumption, the reduction is very important, the volume of the biological sludge is greatly reduced along with the reduction of the water content, the sludge with the water content of more than 85 percent can be conveyed by a pump, the sludge with the water content of 70-75 percent is in a soft mud state, the sludge with the water content of 60-65 percent is almost in a solid state, the sludge with the water content of 35-40 percent is in a discrete state, and the sludge with the water content of 10-15 percent is in a powder state.
The sludge contains a large amount of pathogenic bacteria, parasitic ova and viruses, so that the disease transmission is easily caused, most of the existing means can not effectively kill the harmful microorganisms or viruses, and the disease transmission is easily caused. The sludge in the sewage treatment plant in China is directly used for agriculture without treatment to a great extent, and even the sewage treatment plant provided with the digestion tank is only used for agriculture after slight dehydration, so that the sludge does not meet the sludge agricultural sanitary standard. Some cities are piled up in the open air, which causes the conditions of garbage accumulation around the cities, mosquito and fly breeding and environmental pollution.
The water content in the sludge can be roughly divided into 4 types, namely, interstitial water among particles, capillary water among particles, adsorbed water of sludge particles and water inside the particles, and sludge concentration mainly reduces the interstitial water in the sludge. However, in this way, conditioning agents such as calcium oxide and iron salt are added to the sludge, which increases the cost and the risk of secondary pollution.
CN108585392A discloses a high-pressure discharge biochemical sludge conditioning method, in which sludge is placed in a closed container, then the pressure inside the container is raised by adopting a pressurization mode, the pressure is released within an extreme time after the pressure is raised to a rated value, and the microbial cells in the sludge are subjected to wall breaking by gas expansion and shock impact generated at the instant of pressure release, so as to implement sludge conditioning, but this method only implements pressure release within an extreme time, so that the microbial cells are subjected to wall breaking, and the drying efficiency cannot be accelerated; CN206736061U is a sludge low-temperature continuous flash evaporation drying tower, realizes the quick drying of sludge under the low-temperature state, but its equipment structure is complicated, and the running cost is high.
At present, a sludge treatment system which can rapidly realize sludge disintegration and drying and effectively kill the harmful microorganisms or viruses is needed.
Disclosure of Invention
The invention aims to provide a system for quickly dehydrating and drying excess sludge.
The purpose of the invention is realized by adopting the following technical scheme:
the invention discloses a rapid residual sludge dewatering and drying system, which comprises: the high-temperature pressure-bearing tank 1, the drying tank 2, the inner sieve barrel 21, the outer sieve barrel 22, the mud scraping device 3, the mud scraping shaft 31, the mud scraping rod 32, the mud scraping support rod 33 and the mud scraping assembly 34;
the high-temperature pressure-bearing tank 1 and the drying tank 2 are of cylindrical structures, and the high-temperature pressure-bearing tank 1 is arranged at the top of the drying tank 2 and is in sealed pressure-bearing connection; the bottom of the high-temperature pressure-bearing tank 1 is provided with an electromagnetic valve; the electromagnetic valve is communicated with the drying tank 2, an inner sieve barrel 21 and an outer sieve barrel 22 are arranged in the drying tank, and the central axes of the inner sieve barrel, the outer sieve barrel, the high-temperature pressure-bearing tank and the drying tank are on the same straight line;
a mud scraping device 3 is arranged in the drying tank 2, and the mud scraping device 3 comprises a mud scraping shaft 31, a mud scraping rod 32, a mud scraping support rod 33 and a mud scraping assembly 34; the mud scraping shaft 31 is connected with the mud scraping rod, the mud scraping rod 32 is connected with the mud scraping support rod, and the mud scraping component 34 is arranged on the mud scraping support rod.
Further, the high-temperature pressure-bearing tank 1 is a microwave heating tank;
further, the volume ratio of the high-temperature pressure-bearing tank 1 to the drying tank 2 is 4-20;
further, the working temperature of the high-temperature pressure-bearing tank 1 is 230-500 ℃; the pressure is 5-30 bar;
further, the adding amount of sludge in the high-temperature pressure-bearing tank 1 is 1/8-2/3 of the volume of the high-temperature pressure-bearing tank;
further, a water vapor discharge port is arranged at the top of the drying tank 2, a pressure valve is arranged at the water vapor discharge port, and the pressure valve is opened to release pressure when the pressure exceeds a threshold value;
further, the threshold range is 2-5 bar;
further, the high-temperature pressure-bearing tank 1 is provided with a sludge inlet;
further, a spiral conveyor is arranged at the bottom of the drying tank 2 to convey dried sludge to the outside of the tank body;
further, the system also comprises a pre-conditioning tank 4 and a dewatering device 5;
further, the water vapor discharge port communicates with the pre-conditioning tank 4;
further, the biological sludge is pre-dehydrated by the dehydration device 5, and the moisture content of the pre-dehydrated sludge is 80-90%;
further, the water vapor in the pre-conditioning tank 4 preheats the residual sludge to 50-90 ℃;
further, a temperature and pressure measuring device is arranged in the high-temperature pressure-bearing tank, when the temperature and pressure measuring device reaches a specified value, the electromagnetic valve is opened, and the slurry enters the drying tank from the high-temperature pressure-bearing tank;
further, scrape the mud subassembly that sets up on the mud branch and all contact with the inner wall of mummification jar, the interior outer wall of interior sieve bucket and the interior outer wall of outer sieve bucket.
The biological sludge rapid dehydration and drying system at least has the following advantages:
1. the high-temperature pressure-bearing tank heated by microwaves can quickly heat sludge in the tank body to a specified temperature, and the high pressure of the tank body can be realized without adding gas, so that the structure of the bacterial colloid and the structure of cell walls are destroyed under the high-temperature high-pressure;
2. when the temperature and the pressure in the high-temperature pressure-bearing tank reach specified values, the electromagnetic valve is instantly opened, the slurry is injected into the drying tank under the action of high pressure, the external pressure of cells in the biological sludge is instantly released due to the instant reduction of the pressure, and the pressure in the cells is subjected to cell wall fracturing under high temperature and high pressure, so that fine bubbles are broken;
3. instantly reducing the pressure of the high-temperature high-pressure slurry to instantly evaporate water in the slurry, opening a pressure valve to release pressure when the pressure in the drying tank exceeds a specified threshold, releasing high-pressure steam, further releasing the pressure in the drying tank, and further gasifying the slurry in a high-temperature high-pressure state;
4. water vapor released by the drying tank is conveyed to a pre-modulation tank to be modulated with sludge, so that the sludge is primarily hydrolyzed under the action of high-temperature steam;
5. after the cell structure in the residual sludge is subjected to steam modulation, high temperature and high pressure and pressure relief and burst, due to protein denaturation and cell structure rupture, the sludge drying is realized, and the harmful microorganisms or viruses can be effectively killed;
6. the drying tank is internally provided with an inner sieve barrel and an outer sieve barrel, and when sludge slurry is sprayed onto the drying tank, the sludge slurry is instantly solidified and dried due to temperature change; because the pressure of the injected slurry is huge during pressure relief, the injection on the sieve barrel is more favorable for sludge dispersion and acceleration of water evaporation.
Drawings
FIG. 1 is a schematic view of a rapid dewatering and drying system for excess sludge;
FIG. 2 is another schematic diagram of a rapid dewatering and drying system for excess sludge.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," when used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
1) Conveying the residual sludge to the high-temperature pressure-bearing tank for heating;
2) when the sludge is heated to a temperature of more than or equal to 230 ℃ and a pressure of more than or equal to 5 bar, opening an electromagnetic valve, instantly spraying the slurry in the high-temperature pressure-bearing tank into a drying tank, spraying the slurry onto an inner sieve barrel and an outer sieve barrel arranged in the drying tank, dispersing the sludge onto the sieve barrels, evaporating water, and drying the sludge;
3) when the pressure in the drying tank exceeds a threshold value of 4 bar, the pressure valve is opened to discharge water vapor;
4) starting the mud scraping device, and starting mud scraping by the mud scraping assembly;
5) and after the sludge scraping is finished, conveying the dried sludge to the outside of the tank body by a screw conveyor arranged at the bottom of the drying tank.
The water content of the excess sludge is 95 percent before treatment, and the water content is reduced to 30 to 35 percent after the treatment.
Example 2
On the basis of the example 1, the method comprises the following steps of,
before the step (1), conveying the excess sludge into a dehydration device 5 for pre-dehydration, wherein the water content of the sludge after the pre-dehydration is 80-90%; the sludge after pre-dehydration enters a pre-modulation tank 4, the water vapor discharge port in the drying tank is communicated with the pre-modulation tank 4, and the water vapor in the pre-modulation tank 4 preheats the residual sludge to 60 ℃.
The water content of the excess sludge is 95 percent before treatment, and the water content is reduced to 25 to 30 percent after the treatment.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (10)
1. A rapid dehydration and drying system for excess sludge, which is characterized in that,
the system comprises: the high-temperature pressure-bearing tank 1, the drying tank 2, the inner sieve barrel 21, the outer sieve barrel 22, the mud scraping device 3, the mud scraping shaft 31, the mud scraping rod 32, the mud scraping support rod 33 and the mud scraping assembly 34;
the high-temperature pressure-bearing tank 1 and the drying tank 2 are of cylindrical structures, and the high-temperature pressure-bearing tank 1 is arranged at the top of the drying tank 2 and is in sealed pressure-bearing connection; the bottom of the high-temperature pressure-bearing tank 1 is provided with an electromagnetic valve; the electromagnetic valve is communicated with the drying tank 2, an inner sieve barrel 21 and an outer sieve barrel 22 are arranged in the drying tank, and the central axes of the inner sieve barrel, the outer sieve barrel, the high-temperature pressure-bearing tank and the drying tank are on the same straight line;
a mud scraping device 3 is arranged in the drying tank 2, and the mud scraping device 3 comprises a mud scraping shaft 31, a mud scraping rod 32, a mud scraping support rod 33 and a mud scraping assembly 34; the mud scraping shaft 31 is connected with the mud scraping rod, the mud scraping rod 32 is connected with the mud scraping support rod, and the mud scraping component 34 is arranged on the mud scraping support rod.
2. The rapid dewatering and drying system for excess sludge according to claim 1, wherein: the volume ratio of the high-temperature pressure-bearing tank 1 to the drying tank 2 is 4-20.
3. The rapid dewatering and drying system for excess sludge according to claim 1, wherein: the working temperature of the high-temperature pressure-bearing tank 1 is 230 ℃ and 500 ℃; the pressure is 5-30 bar.
4. The rapid dewatering and drying system for excess sludge according to claim 1, wherein: the adding amount of the sludge in the high-temperature pressure-bearing tank 1 is 1/8-2/3 of the volume of the high-temperature pressure-bearing tank.
5. The rapid dewatering and drying system for excess sludge according to claim 1, wherein: the top of the drying tank 2 is provided with a water vapor discharge port, the water vapor discharge port is provided with a pressure valve, and the pressure valve is opened to release pressure when the pressure exceeds a threshold value.
6. The rapid dewatering and drying system for excess sludge according to claim 5, wherein: the threshold value ranges from 2 to 5 bar.
7. The rapid dewatering and drying system for excess sludge according to claim 1, wherein: the system also comprises a pre-conditioning tank 4 and a dewatering device 5.
8. The rapid dewatering and drying system for excess sludge according to claim 7, wherein: the water vapor discharge port is communicated with the pre-conditioning tank 4, and the excess sludge in the pre-conditioning tank 4 is preheated to 50-90 ℃ by water vapor.
9. The rapid dewatering and drying system for excess sludge according to claim 1, wherein: and a temperature and pressure measuring device is arranged in the high-temperature pressure-bearing tank, when the temperature and pressure measuring device reaches a specified value, the electromagnetic valve is opened, and the slurry enters the drying tank from the high-temperature pressure-bearing tank.
10. The rapid dewatering and drying system for excess sludge according to claim 1, wherein: the mud scraping component arranged on the mud scraping support rod is in contact with the inner wall of the drying tank, the inner wall and the outer wall of the inner sieve barrel and the inner wall and the outer wall of the outer sieve barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010636717.0A CN111908766B (en) | 2020-07-03 | 2020-07-03 | Rapid residual sludge dewatering and drying system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010636717.0A CN111908766B (en) | 2020-07-03 | 2020-07-03 | Rapid residual sludge dewatering and drying system |
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| CN111908766A true CN111908766A (en) | 2020-11-10 |
| CN111908766B CN111908766B (en) | 2022-05-03 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102234170A (en) * | 2010-04-29 | 2011-11-09 | 安徽合协生态环境科技有限公司 | Method and device for rapidly reducing moisture content of sludge |
| CN102838264A (en) * | 2012-02-27 | 2012-12-26 | 四川深蓝环保科技股份有限公司 | Process and apparatus for treating biomass |
| CN103396815A (en) * | 2013-08-05 | 2013-11-20 | 中国科学院城市环境研究所 | Method for preparing carbon materials by use of sludge |
| CN104326638A (en) * | 2014-11-04 | 2015-02-04 | 重庆大学 | Horizontal concentric double-layer sludge thin-layer drying equipment |
| CN108840548A (en) * | 2018-08-29 | 2018-11-20 | 湖南军信环保股份有限公司 | Pyrohydrolysis flash separation device and pyrohydrolysis flash separation technique, pyrohydrolysis system and pyrohydrolysis technique |
| CN108892348A (en) * | 2018-06-25 | 2018-11-27 | 中国石油天然气集团有限公司 | A kind of oily sludge synchronizes the method and device of dehydration oil recovery |
| CN108911466A (en) * | 2018-07-27 | 2018-11-30 | 成都源永科技发展有限公司 | A kind of the high-efficiency dehydration processing system and method for industrial sludge hydro-thermal reaction |
-
2020
- 2020-07-03 CN CN202010636717.0A patent/CN111908766B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102234170A (en) * | 2010-04-29 | 2011-11-09 | 安徽合协生态环境科技有限公司 | Method and device for rapidly reducing moisture content of sludge |
| CN102838264A (en) * | 2012-02-27 | 2012-12-26 | 四川深蓝环保科技股份有限公司 | Process and apparatus for treating biomass |
| CN103396815A (en) * | 2013-08-05 | 2013-11-20 | 中国科学院城市环境研究所 | Method for preparing carbon materials by use of sludge |
| CN104326638A (en) * | 2014-11-04 | 2015-02-04 | 重庆大学 | Horizontal concentric double-layer sludge thin-layer drying equipment |
| CN108892348A (en) * | 2018-06-25 | 2018-11-27 | 中国石油天然气集团有限公司 | A kind of oily sludge synchronizes the method and device of dehydration oil recovery |
| CN108911466A (en) * | 2018-07-27 | 2018-11-30 | 成都源永科技发展有限公司 | A kind of the high-efficiency dehydration processing system and method for industrial sludge hydro-thermal reaction |
| CN108840548A (en) * | 2018-08-29 | 2018-11-20 | 湖南军信环保股份有限公司 | Pyrohydrolysis flash separation device and pyrohydrolysis flash separation technique, pyrohydrolysis system and pyrohydrolysis technique |
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Effective date of registration: 20220527 Address after: 215600 No. 188, Jinxia Road, Jingang town, Zhangjiagang, Suzhou, Jiangsu Patentee after: Xu Dan Address before: 215600 fan Xiaoyu, No. 7, Chengyang Road, Jingang town, Zhangjiagang, Suzhou, Jiangsu Patentee before: Fan Xiaoyu |
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