CN112759219A - Deep dehydration process for sludge - Google Patents
Deep dehydration process for sludge Download PDFInfo
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- CN112759219A CN112759219A CN202110052359.3A CN202110052359A CN112759219A CN 112759219 A CN112759219 A CN 112759219A CN 202110052359 A CN202110052359 A CN 202110052359A CN 112759219 A CN112759219 A CN 112759219A
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- sludge
- surface treatment
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- treatment
- water content
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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
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sludge deep dehydration process, which comprises the following steps: (1) performing microwave pretreatment on surface treatment sludge from a sewage treatment plant; (2) and (3) carrying out high-pressure squeezing on the surface-treated sludge subjected to microwave pretreatment, wherein vacuumizing is assisted in the high-pressure squeezing process, so that the water content of the sludge is reduced to 25-30%. The invention has low energy consumption, no dust and waste gas and obviously reduced treatment cost.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a sludge deep dehydration process.
Background
The sludge has high water content, large volume and difficult treatment, and is very easy to cause secondary pollution. The sludge dewatering and volume reduction are the only methods for solving the problems at present, the sludge dewatering with high efficiency can greatly reduce the water content of the sludge, reduce the volume of the sludge, reduce the transportation cost of the sludge, prolong the service life of a sludge landfill, increase the heat value when the sludge is incinerated and reduce the post-treatment and disposal cost of the sludge. For domestic sewage treatment plants, the sludge treatment cost of which accounts for 20-50% of the total operation cost of the sewage treatment plants, the reduction of the sludge treatment cost has great significance.
At present, sewage plants in China mainly adopt a method of early conditioning and later dewatering to reduce the water content of sludge. The early conditioning method adopts chemical conditioning, namely various organic or inorganic chemical agents are added into the sludge to improve the sludge dewatering performance so as to facilitate later mechanical dewatering. Commonly used chemical conditioning agents include Polyacrylamide (PAM), polyaluminum chloride (PAC), ferric chloride (FeCl3), quicklime (CaO), and the like. The chemical conditioning agent has the functions of improving the colloidal feather structure of the sludge, changing the physicochemical properties of sludge flocs such as surface potential, viscosity, water distribution and the like, and promoting sludge flocculation, thereby improving the sludge dewatering performance and greatly reducing the CST value and the specific resistance value of the sludge. But the chemical conditioning medicine consumption is large and the operation cost is high. If other methods such as radiation, thermal conditioning and the like are used for early conditioning, although the medicine consumption can be saved, the energy consumption is greatly improved, and the sludge treatment and disposal cost cannot be reduced basically.
The water content of the sludge subjected to filter pressing treatment in a sewage plant reaches about 50-75%, the water content cannot be reduced by increasing the filter pressing or the pressure, and then the water-containing sludge is sent for further drying. The drying modes mainly comprise direct drying and indirect drying, and the direct drying comprises the following steps: the heat medium directly contacts the surface of the sludge to remove the water in the sludge, the transmission and evaporation efficiency is higher, but the heat medium is polluted. Such equipment includes rotary kiln sludge dryers, flash dryers, drum dryers, belt dryers, and the like. Indirect drying: the heat is transferred to the wet sludge through the heat exchanger, the medium can be air, heat transfer oil, water vapor and the like, the heat transfer efficiency and the evaporation efficiency of the wet sludge are lower than those of direct heat drying, and the subsequent process of separating the heat medium from the dry sludge is omitted. The operating equipment of this technology is a film thermal dryer, a disc thermal dryer, a paddle dryer, or the like. Finally, the water content of the sludge is reduced to 25-30% by drying. The drying mode has high energy consumption, long time, easy generation of waste gas and dust pollution and high treatment cost.
Disclosure of Invention
The invention aims to provide a sludge deep dehydration process which is low in energy consumption, free of dust and waste gas and remarkably reduced in treatment cost.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a sludge deep dehydration process comprises the following steps:
(1) performing microwave pretreatment on surface treatment sludge from a sewage treatment plant;
(2) and (3) carrying out high-pressure squeezing on the surface-treated sludge subjected to microwave pretreatment, wherein vacuumizing is assisted in the high-pressure squeezing process, so that the water content of the sludge is reduced to 25-30%.
The surface treatment sludge is further subjected to filter pressing and squeezing, and the water content of the sludge is hardly reduced, so that the conventional method is to further perform thermal drying on the sludge, but the thermal drying has the disadvantages of huge energy consumption, long time, easy generation of waste gas and dust in the thermal drying process, low efficiency and high cost.
The invention develops a new method, firstly carries out microwave pretreatment on the surface treatment sludge, and then carries out high-pressure pressing assisted with vacuumizing, thereby obtaining remarkable dehydration effect, reducing the water content of the sludge to 25-30%, and having the effect equivalent to that of the conventional heat drying treatment. The microwave pretreatment is very critical, the specific microwave pretreatment provided by the invention can destroy the internal structure of the sludge, reduce specific resistance and enable the sludge to be easily dewatered, and meanwhile, the microwave pretreatment can provide a basic preheating temperature for the sludge, and the temperature of the microwave pretreatment and the temperature of the sludge are combined to act together to enable the moisture in the sludge to be more easily discharged by combining with the heat energy generated by the next high-pressure squeezing. After the treatment, the water can be squeezed out from the sludge in a large amount by next high-pressure squeezing, and the operation of vacuumizing in the high-pressure squeezing process can be used for squeezing in a synergic manner so as to facilitate the water discharge. The conventional microwave treatment is for drying, and the microwave treatment of the present invention is clearly different from the conventional microwave drying.
In addition, the microwave pretreatment is carried out, and then the high-pressure pressing with the assistance of vacuumizing is carried out, so that the use of a dehydration conditioner is avoided, and the cost and the working procedures can be reduced.
The microwave drying is only suitable for drying small-scale objects, and for the large treatment capacity of surface treatment sludge, the conventional method cannot select a microwave drying mode for treatment.
The microwave pretreatment is to spread the surface treatment sludge flatly and irradiate the surface treatment sludge with microwaves so that the temperature of the surface treatment sludge is raised to 50-70 ℃. The thickness of the flat spread of the surface treatment sludge is 15-30 cm.
Preferably, the water content of the surface-treated sludge from the sewage treatment plant is 50 to 75%.
Preferably, the microwave pretreatment is to spread the surface-treated sludge flat and then irradiate the surface-treated sludge with microwaves so that the temperature of the surface-treated sludge rises to 50 to 70 ℃.
Preferably, the surface treatment sludge is spread to a thickness of 15 to 30 cm.
Preferably, the microwave irradiation is carried out at a microwave irradiation dose of 25-35kw per kg of sludge.
Preferably, the pressure of the high-pressure pressing is 5 to 10 MPa.
Preferably, the dwell time of the high pressure press is 20 to 60 s.
Preferably, the degree of vacuum is set to-0.05 to-0.1 MPa.
The invention has the beneficial effects that: low energy consumption, no dust and waste gas, short treatment time and remarkably reduced treatment cost.
Detailed Description
The technical solution of the present invention will be further specifically described below by way of specific examples.
In the present invention, the raw materials and equipment used are commercially available or commonly used in the art, unless otherwise specified. The methods in the following examples are conventional in the art unless otherwise specified.
Example 1:
a sludge deep dehydration process comprises the following steps:
(1) 5 tons of surface treatment sludge (the water content is 74.8%) from a sewage treatment plant, flatly paving the surface treatment sludge (the thickness is 15 cm), and then performing microwave irradiation on the surface treatment sludge to ensure that the temperature of the surface treatment sludge is increased to 50 ℃, wherein the microwave irradiation amount of the microwave irradiation is 25kw per kilogram of sludge;
(2) and (2) performing high-pressure squeezing on the surface-treated sludge subjected to microwave pretreatment, wherein the pressure of the high-pressure squeezing is 5Mpa, the pressure maintaining time of the high-pressure squeezing is 60s, vacuumizing is assisted in the high-pressure squeezing process, the vacuum degree of the vacuumizing is set to be-0.1 Mpa, and the water content of the sludge is reduced to 29.3% after detection.
Example 2:
a sludge deep dehydration process comprises the following steps:
(1) 5 tons of surface treatment sludge (the water content is 51.7%) from a sewage treatment plant, flatly paving the surface treatment sludge (the thickness is 30 cm), and then performing microwave irradiation on the surface treatment sludge to ensure that the temperature of the surface treatment sludge is raised to 70 ℃, wherein the microwave irradiation amount of the microwave irradiation is 35kw per kilogram of sludge;
(2) and (2) performing high-pressure squeezing on the surface-treated sludge subjected to microwave pretreatment, wherein the pressure of the high-pressure squeezing is 10Mpa, the pressure maintaining time of the high-pressure squeezing is 20s, vacuumizing is assisted in the high-pressure squeezing process, the vacuum degree of the vacuumizing is set to be-0.05 Mpa, and the water content of the sludge is reduced to 25.4% after detection.
Example 3:
a sludge deep dehydration process comprises the following steps:
(1) 5 tons of surface treatment sludge (the water content is 60.2%) from a sewage treatment plant, flatly paving the surface treatment sludge (the thickness is 20 cm), and then performing microwave irradiation on the surface treatment sludge to ensure that the temperature of the surface treatment sludge is raised to 60 ℃, wherein the microwave irradiation amount of the microwave irradiation is 30kw per kilogram of sludge;
(2) and (2) performing high-pressure squeezing on the surface-treated sludge subjected to microwave pretreatment, wherein the pressure of the high-pressure squeezing is 8Mpa, the pressure maintaining time of the high-pressure squeezing is 45s, vacuumizing is assisted in the high-pressure squeezing process, the vacuum degree of the vacuumizing is set to be-0.096 Mpa, and the water content of the detected sludge is reduced to 26.5%.
Comparative example 1
The scheme is different from the embodiment 1 in that the microwave pretreatment is not carried out on the sludge, and the detected sludge moisture content is 73.6 percent in the other same embodiments 1.
Comparative example 2
The scheme is different from the embodiment 2 in that the microwave pretreatment is not carried out on the sludge, and the detected sludge moisture content is 51.3 percent in the other same embodiments 2.
Comparative example 3
The scheme is different from the embodiment 4 in that the microwave pretreatment is not carried out on the sludge, and the detected sludge moisture content is 59.3 percent in the other same embodiments 4.
1 ton of surface treatment sludge with the water content of 60 percent is treated in the same way, the target is reduced to the water content of 25 percent, the cost of the conventional thermal drying method is about 300 yuan, and the time is about 40 min; the cost of the scheme of the invention is about 30 yuan, and the time is about 10 min; the cost of the invention is about one tenth of that of the conventional method, and the scheme of the invention has no dust and waste gas, and is more environment-friendly.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (8)
1. The deep sludge dewatering process is characterized by comprising the following steps:
(1) performing microwave pretreatment on surface treatment sludge from a sewage treatment plant;
(2) and (3) carrying out high-pressure squeezing on the surface-treated sludge subjected to microwave pretreatment, wherein vacuumizing is assisted in the high-pressure squeezing process, so that the water content of the sludge is reduced to 25-30%.
2. The process of claim 1, wherein the water content of the surface-treated sludge from sewage treatment plants is 50-75%.
3. The deep sludge dewatering process of claim 1, wherein the microwave pretreatment is to spread the surface treatment sludge flat and then irradiate the surface treatment sludge with microwaves so that the temperature of the surface treatment sludge rises to 50-70 ℃.
4. The deep sludge dewatering process of claim 3, wherein the surface treatment sludge is laid to a thickness of 15-30 cm.
5. The process of claim 3, wherein the microwave irradiation dose is 25-35kw per kg of sludge.
6. The deep sludge dewatering process of claim 1, wherein the high pressure press is at a pressure of 5-10 Mpa.
7. The deep sludge dewatering process of claim 6, wherein the dwell time of the high pressure pressing is 20-60 s.
8. The deep sludge dewatering process according to claim 1 or 6, wherein the degree of vacuum is set to-0.05 to-0.1 MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110052359.3A CN112759219A (en) | 2021-01-15 | 2021-01-15 | Deep dehydration process for sludge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110052359.3A CN112759219A (en) | 2021-01-15 | 2021-01-15 | Deep dehydration process for sludge |
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| CN112759219A true CN112759219A (en) | 2021-05-07 |
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| CN202110052359.3A Pending CN112759219A (en) | 2021-01-15 | 2021-01-15 | Deep dehydration process for sludge |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102161560A (en) * | 2011-04-28 | 2011-08-24 | 宜兴能达环保科技有限公司 | Method and device for dehydrating sludge in sewage treatment plant |
| CN102827661A (en) * | 2012-08-31 | 2012-12-19 | 燕山大学 | Sludge fuelization treatment process of urban sewage treatment plant |
| CN108503176A (en) * | 2017-04-08 | 2018-09-07 | 浙江威治环保科技有限公司 | Microwave improves dehydration and drying method for sludge treatment |
-
2021
- 2021-01-15 CN CN202110052359.3A patent/CN112759219A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102161560A (en) * | 2011-04-28 | 2011-08-24 | 宜兴能达环保科技有限公司 | Method and device for dehydrating sludge in sewage treatment plant |
| CN102827661A (en) * | 2012-08-31 | 2012-12-19 | 燕山大学 | Sludge fuelization treatment process of urban sewage treatment plant |
| CN108503176A (en) * | 2017-04-08 | 2018-09-07 | 浙江威治环保科技有限公司 | Microwave improves dehydration and drying method for sludge treatment |
Non-Patent Citations (2)
| Title |
|---|
| 台明青等: "《基于响应曲面法（RSM）优化污泥脱水性能研究》", 31 March 2019, 武汉：武汉大学出版社 * |
| 李玉超等: "《水污染治理及其生态修复技术研究》", 31 May 2019, 青岛：中国海洋大学出版社 * |
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