CN106865947B - Sludge drying treatment method - Google Patents
Sludge drying treatment method Download PDFInfo
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- CN106865947B CN106865947B CN201710161149.1A CN201710161149A CN106865947B CN 106865947 B CN106865947 B CN 106865947B CN 201710161149 A CN201710161149 A CN 201710161149A CN 106865947 B CN106865947 B CN 106865947B
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- sludge
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- water
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- 239000010802 sludge Substances 0.000 title claims abstract description 96
- 238000001035 drying Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000010521 absorption reaction Methods 0.000 claims abstract description 12
- 239000002068 microbial inoculum Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 239000011358 absorbing material Substances 0.000 claims abstract description 9
- 238000012216 screening Methods 0.000 claims abstract description 6
- 150000001875 compounds Chemical class 0.000 claims abstract description 4
- 238000007605 air drying Methods 0.000 claims description 8
- 241000431964 Candida glycerinogenes Species 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 4
- 241001147780 Alicyclobacillus Species 0.000 claims description 3
- 241000193830 Bacillus <bacterium> Species 0.000 claims description 3
- 241001467578 Microbacterium Species 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 241000194017 Streptococcus Species 0.000 claims description 2
- 230000001877 deodorizing effect Effects 0.000 claims description 2
- 230000005484 gravity Effects 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 239000000741 silica gel Substances 0.000 claims description 2
- 229910002027 silica gel Inorganic materials 0.000 claims description 2
- 241000439780 Chelatococcus daeguensis Species 0.000 claims 1
- 241000191940 Staphylococcus Species 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000010248 power generation Methods 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 238000005303 weighing Methods 0.000 description 3
- 239000002361 compost Substances 0.000 description 2
- 208000005156 Dehydration Diseases 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 244000045947 parasite Species 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
Images
Classifications
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
-
- 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
-
- 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
- C02F2303/06—Sludge reduction, e.g. by lysis
Abstract
The invention belongs to the technical field of comprehensive utilization of resources and ecological environment protection, and discloses a sludge drying treatment method, which comprises the following steps: a. feeding fresh sludge into a filter press for filter pressing to obtain sludge with the water content of below 80%; b. adding a compound microbial inoculum into the obtained sludge, uniformly stirring and pretreating to obtain a mixture with the water content of 60-70%; c. mixing the obtained mixture with sludge with the water content of below 25% to obtain granular sludge; d. sending the obtained granular sludge into a low-temperature blast drying unit for drying; e. then fully and uniformly mixing the granular sludge and the high-efficiency water absorption material with the water content of 5-10% in a stirring device; and (3) vibrating and screening the obtained mixture to respectively obtain sludge particles with the water content of below 25% and a water absorbing material with the water content of 40% -60%. The method of the invention is operated at low temperature, and the obtained dried sludge is partially recycled, and partially used for incineration heating and power generation, thereby realizing resource utilization.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of resources and ecological environment protection, and particularly relates to a sludge drying treatment process.
Background
Along with the continuous improvement of the urbanization level of China, the treatment capacity of urban sewage is continuously enlarged, and the corresponding sludge yield is also continuously increased. The sludge produced in the sewage treatment process generally accounts for about 0.1 percent of the total volume of the sewage, the content of organic matters is high, the water content is high and generally reaches 95 to 99 percent, and the sludge contains a large amount of pathogenic bacteria and parasites, is easy to rot and smell and is extremely unstable. Therefore, how to reasonably treat and dispose of the sludge becomes a major concern for sewage treatment plants and related environmental protection departments.
The sludge treatment industry in China starts late, and the development of the sludge treatment technology is not mature. At present, the common sludge treatment and disposal modes mainly comprise sanitary landfill, compost land utilization and drying incineration. These several sludge treatment methods have certain disadvantages. The land cost is high due to large occupied area of sanitary landfill of the sludge, and simultaneously, leachate is generated to pollute underground water; the utilization of compost land sometimes causes secondary pollution in aspects of heavy metals and the like; a large amount of auxiliary fuel is required to be added due to high solid content and low heat value in the incineration process, and a large amount of harmful gas is generated in the incineration process. Therefore, the development and utilization of new sludge treatment technologies are not slow.
Disclosure of Invention
The invention aims to provide an industrialized low-temperature sludge drying treatment process, which can controllably, quickly and efficiently remove water in sludge under the environment of not more than 70 ℃ to form a material with the water content of less than 25% and capable of incinerating to generate heat and electricity, so that the sludge is recycled.
In order to achieve the purpose, the invention adopts the following technical scheme:
a sludge drying treatment method comprises the following steps:
a. feeding fresh sludge into a filter press for filter pressing to obtain sludge with the water content of below 80%;
b. b, adding a compound microbial inoculum which accounts for 0.1-0.2% of the weight of the sludge into the sludge obtained in the step a, uniformly stirring, and pretreating to obtain a mixture with the water content of 60-70%;
c. mixing the mixture obtained in the step b and sludge with the water content of below 25% in a mass ratio of (3-5) to 1 to obtain granular sludge with lower viscosity and better rheological property;
d. c, sending the granular sludge obtained in the step c into a low-temperature blast drying unit for drying to obtain granular sludge with the water content reduced to 30% -50%;
e. fully and uniformly mixing the granular sludge obtained in the step d and the high-efficiency water absorption material with the water content of 5-10% in a stirring device; and (3) vibrating and screening the obtained mixture to respectively obtain sludge particles with the water content of below 25% and a water absorbing material with the water content of 40% -60%.
In step b, the complex microbial inoculum is prepared from Bacillus alicyclolyticus (Alicyclobacillus), Candida glycerinogenes (Candida glycerinogenes), Streptococcus chelidosus (Deltococcus daeguensis) and Microbacterium aquaticum (Aquamobium) in a ratio of 5: 4: 4: 2 by weight ratio.
The water absorbing material is dehydrated and then added into the step e for recycling; and c, adding sludge particles with the water content of below 25% into the step c for recycling.
In step b, the gas produced by the pre-treatment is used to provide heat to the low temperature forced air drying unit.
In step d, the temperature in the low temperature forced air drying unit does not exceed 70 ℃.
The low-temperature blast drying unit is a closed space, and a conveyer is arranged at the lower part of the low-temperature blast drying unit and used for conveying sludge from one side to the other side; the upper part of the closed space is provided with a hot air supply device, an air supply surface is parallel to the surface of the sludge conveyor, and the surface of the hot air supply device is provided with a plurality of uniformly distributed small holes so as to control the flow rate of hot air.
The low-temperature blast drying unit is provided with an exhaust fan at a sludge inlet for discharging hot air and taking away a part of evaporated water vapor; the hot air outlet is provided with a deodorizing device.
In the step e, the stirring device is funnel-shaped, a vibrating screen is arranged in the middle of the funnel, and a vertical channel of a spiral stirrer is arranged at the lower part of the funnel; the low-temperature forced air drying unit described in step d is connected to the bottom of the vertical channel.
In the step e, the sludge particles and the high-efficiency water absorption material are added into the screen according to the mass ratio of 2-3: 1.
In the step e, the efficient water absorption material is round particles with the particle size of 2-3 mm, and the round particles are made of efficient water absorption resin, silica gel and porous activated carbon according to the specific gravity of 5:3: 2.
In step e, the diameter of the holes of the vibrating screen in the stirring device is 2 mm.
Compared with the existing sludge drying, the invention has the following advantages:
the method comprises the steps of firstly removing partial moisture in fresh sludge by using the existing mature filter pressing process, then removing partial moisture by adopting a low-temperature drying technology after pretreatment by using a microbial agent and a physical and chemical method, and finally drying the sludge by using a high-efficiency water absorption material deep dehydration treatment process technology, so that the sludge can be recycled. And the stability and efficiency of the process are further improved in the later stage, so that the system process is ensured to run in a low-energy consumption, low-running cost and high-efficiency state. 25-30% of the dried sludge after drying treatment is recycled, and the rest part of the dried sludge enters a dried sludge storage bin for incineration heating and power generation, so that resource utilization is realized.
Drawings
FIG. 1 is a process flow diagram of the sludge drying treatment of the present invention.
Detailed Description
The present invention and its advantageous effects are described in further detail below with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
Sending 10kg of fresh sludge with the water content of 95% into a filter press for filter pressing to obtain 2kg of sludge with the water content of 75%; weighing 2g of the complex microbial inoculum, adding the complex microbial inoculum into the sludge obtained by filter pressing, uniformly stirring the sludge, and carrying out pretreatment to obtain 1.43kg of a mixture with the water content of 65%; then adding 0.36kg of sludge dry material with the water content of below 25% into the mixture, and mixing to obtain granular sludge; the obtained granular sludge is sent into a low-temperature blast drying unit for drying, and 1.2kg of granular sludge with the water content of 35% is obtained; then fully and uniformly mixing the obtained granular sludge and 0.4kg of high-efficiency water-absorbing material with the water content of 10 percent in a stirring device; and finally, vibrating and screening the obtained mixture to respectively obtain sludge particles with the water content of 20% and a water absorbing material with the water content of 45%.
Example 2
Feeding 50kg of fresh sludge with the water content of 95% into a filter press for filter pressing to obtain 11kg of sludge with the water content of 77%; weighing 16.5g of composite microbial inoculum, adding the composite microbial inoculum into the sludge obtained by filter pressing, uniformly stirring the sludge, and carrying out pretreatment to obtain 7.8kg of mixture with the water content of 68%; then 2.3kg of sludge dry material with the water content of below 25 percent is added into the mixture and mixed to obtain granular sludge; the obtained granular sludge is sent into a low-temperature blast drying unit for drying, and 7.5kg of granular sludge with the water content of 40% is obtained; then, fully and uniformly mixing the obtained granular sludge and 3kg of high-efficiency water absorption material with the water content of 5 percent in a stirring device; and finally, vibrating and screening the obtained mixture to respectively obtain sludge particles with the water content of 15% and a water absorbing material with the water content of 55%.
Example 3
Feeding 100kg of fresh sludge with the water content of 95% into a filter press for filter pressing, and obtaining 25kg of sludge with the water content of 80% through filter pressing; weighing 50g of the composite microbial inoculum, adding the composite microbial inoculum into the sludge obtained by filter pressing, uniformly stirring the sludge, and carrying out pretreatment to obtain 12.5kg of a mixture with the water content of 60%; adding 4.2kg of sludge dry material with the water content of below 25% into the mixture, and mixing to obtain granular sludge; the obtained granular sludge is sent into a low-temperature blast drying unit for drying, and 12kg of granular sludge with the water content of 30% is obtained; then fully and uniformly mixing the obtained granular sludge and 6kg of high-efficiency water absorption material with the water content of 5 percent in a stirring device; and finally, vibrating and screening the obtained mixture to respectively obtain sludge particles with the water content of 18% and a water absorbing material with the water content of 50%.
Claims (10)
1. The sludge drying treatment method is characterized by comprising the following steps:
a. feeding fresh sludge into a filter press for filter pressing to obtain sludge with the water content of below 80%;
b. b, adding a compound microbial inoculum which is 0.1-0.2% of the weight of the sludge into the sludge obtained in the step a, uniformly stirring and pretreating to obtain a mixture with the water content of 60-70%, wherein the compound microbial inoculum is prepared by mixing bacillus alicyclolyticus (Alicyclobacillus), Candida glycerinogenes (Candida glycerinogenes), staphylococcus chelidosus (Chelatococcus daeguensis) and Aquamobium;
c. mixing the mixture obtained in the step b and sludge with the water content of below 25% in a mass ratio of (3-5): 1 to obtain granular sludge;
d. c, sending the granular sludge obtained in the step c into a low-temperature blast drying unit for drying to obtain granular sludge with the water content reduced to 30% -50%;
e. fully and uniformly mixing the granular sludge obtained in the step d and the high-efficiency water absorption material with the water content of 5-10% in a stirring device; and (3) vibrating and screening the obtained mixture to respectively obtain sludge particles with the water content of below 25% and a water absorbing material with the water content of 40% -60%.
2. The method according to claim 1, wherein in step b, the complex microbial inoculum is prepared from Bacillus alicyclicates (Alicyclobacillus), Candida glycerinogenes (Candida glycerinogenes), Streptococcus chelidosus (Deltacoccus daeguensis) and Microbacterium aquaticum (Aquamirobium) in a ratio of 5: 4: 4: 2 by weight ratio.
3. The method according to claim 1 or 2, wherein the water-absorbing material is dehydrated and then added to step e for recycling; and c, adding sludge particles with the water content of below 25% into the step c for recycling.
4. A method according to claim 1 or 2, characterized in that in step b the gas produced by the pre-treatment is used to provide heat to the low temperature forced air drying unit.
5. The method according to claim 1 or 2, characterized in that in step d the temperature inside the low temperature forced air drying unit does not exceed 70 ℃.
6. The method according to claim 5, wherein the low temperature forced air drying unit is a closed space provided with a conveyor at a lower portion thereof for conveying the sludge from one side to the other side; the upper part of the closed space is provided with a hot air supply device, an air supply surface is parallel to the surface of the sludge conveyor, and the surface of the hot air supply device is provided with a plurality of uniformly distributed small holes so as to control the flow rate of hot air.
7. The method according to claim 6, characterized in that the low temperature forced air drying unit is provided with a suction fan at the sludge inlet to discharge hot air and take away a part of the evaporated water vapor; the hot air outlet is provided with a deodorizing device.
8. The method according to claim 1 or 2, wherein in step e, the stirring device is funnel-shaped, and a vibrating screen is arranged in the middle of the funnel, and a vertical channel of a helical stirrer is arranged at the lower part of the funnel; the low-temperature forced air drying unit described in step d is connected to the bottom of the vertical channel.
9. The method according to claim 1 or 2, wherein in the step e, the mass ratio of the sludge particles to the high-efficiency water absorption material is 2-3: 1.
10. The method as claimed in claim 9, wherein in the step e, the high efficiency water absorption material is round particles with a particle size of 2-3 mm prepared from high efficiency water absorption resin, silica gel and porous activated carbon according to a specific gravity of 5:3: 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710161149.1A CN106865947B (en) | 2017-03-17 | 2017-03-17 | Sludge drying treatment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710161149.1A CN106865947B (en) | 2017-03-17 | 2017-03-17 | Sludge drying treatment method |
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| Publication Number | Publication Date |
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| CN106865947A CN106865947A (en) | 2017-06-20 |
| CN106865947B true CN106865947B (en) | 2020-09-22 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109516515A (en) * | 2019-01-28 | 2019-03-26 | 上海立泉环境科技有限公司 | A kind of high-concentration waste liquid low-temperature evaporation anhydration system and its drying method |
| CN110671923B (en) * | 2019-09-26 | 2020-09-18 | 艾特克控股集团股份有限公司 | Vertical unpowered spiral stirring biological drying device and method |
| CN113024081A (en) * | 2021-03-19 | 2021-06-25 | 安徽国青智能环保科技有限公司 | Sludge dewatering mechanism |
| CN114646207B (en) * | 2022-03-21 | 2023-04-07 | 江苏国信协联能源有限公司 | Wet blue algae drying method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103819071A (en) * | 2014-03-18 | 2014-05-28 | 王兢 | Sludge drying method and system |
| CN104529112A (en) * | 2014-11-28 | 2015-04-22 | 刘子腾 | Sludge bio-drying treatment technology |
| CN105271628A (en) * | 2015-10-22 | 2016-01-27 | 得利满水处理系统(北京)有限公司 | Low-temperature drying system and method of sludge |
| CN105693052A (en) * | 2016-03-14 | 2016-06-22 | 广东工业大学 | Dyeing sludge deep dehydrating-drying treatment device and process |
-
2017
- 2017-03-17 CN CN201710161149.1A patent/CN106865947B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103819071A (en) * | 2014-03-18 | 2014-05-28 | 王兢 | Sludge drying method and system |
| CN104529112A (en) * | 2014-11-28 | 2015-04-22 | 刘子腾 | Sludge bio-drying treatment technology |
| CN105271628A (en) * | 2015-10-22 | 2016-01-27 | 得利满水处理系统(北京)有限公司 | Low-temperature drying system and method of sludge |
| CN105693052A (en) * | 2016-03-14 | 2016-06-22 | 广东工业大学 | Dyeing sludge deep dehydrating-drying treatment device and process |
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Application publication date: 20170620 Assignee: Jieyang rongtu environmental protection equipment Engineering Co.,Ltd. Assignor: SOUTH CHINA University OF TECHNOLOGY Contract record no.: X2023980053369 Denomination of invention: A method of sludge drying treatment Granted publication date: 20200922 License type: Common License Record date: 20231221 |
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