CN116002945A - Sludge heatless drying method - Google Patents
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- CN116002945A CN116002945A CN202310293713.0A CN202310293713A CN116002945A CN 116002945 A CN116002945 A CN 116002945A CN 202310293713 A CN202310293713 A CN 202310293713A CN 116002945 A CN116002945 A CN 116002945A
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- 239000010802 sludge Substances 0.000 title claims abstract description 139
- 238000001035 drying Methods 0.000 title claims abstract description 68
- 230000018044 dehydration Effects 0.000 claims abstract description 25
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 25
- 239000002245 particle Substances 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 239000012024 dehydrating agents Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 27
- 239000000706 filtrate Substances 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 14
- YRIZYWQGELRKNT-UHFFFAOYSA-N 1,3,5-trichloro-1,3,5-triazinane-2,4,6-trione Chemical compound ClN1C(=O)N(Cl)C(=O)N(Cl)C1=O YRIZYWQGELRKNT-UHFFFAOYSA-N 0.000 claims description 12
- 239000010865 sewage Substances 0.000 claims description 12
- 229950009390 symclosene Drugs 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000007605 air drying Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 5
- 239000002028 Biomass Substances 0.000 claims description 3
- 230000008014 freezing Effects 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 239000002071 nanotube Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 230000003750 conditioning effect Effects 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 239000000428 dust Substances 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 41
- 238000010438 heat treatment Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000007787 solid Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 210000002421 cell wall Anatomy 0.000 description 5
- 238000011899 heat drying method Methods 0.000 description 5
- 238000000053 physical method Methods 0.000 description 5
- 210000004027 cell Anatomy 0.000 description 4
- 230000001143 conditioned effect Effects 0.000 description 4
- 230000003834 intracellular effect Effects 0.000 description 4
- 244000005700 microbiome Species 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 238000010297 mechanical methods and process Methods 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention provides a sludge heat-free drying method, relates to the technical field of sludge drying treatment, and aims to solve the problems that the existing sludge drying is high in energy consumption, a large amount of odor and dust are generated in the drying process, and secondary pollution is easy to cause. Comprising the following steps: s1: delivering sludge to be treated into a high-speed dispersing machine to obtain sludge particles which are cut and dispersed to be smaller than 20 mm; s2: delivering the dispersed sludge into a stirrer, adding a sludge dehydrating agent, and uniformly mixing the cut and dispersed sludge by the stirrer; s3: conveying the uniformly mixed materials into an ultrasonic processor; s4: transferring the sludge after uniformly mixing in the step S3 to a reaction tank for stopping reaction for 10 minutes; s5: and transferring the reacted sludge to a squeezing device for rapid dehydration.
Description
Technical Field
The invention relates to the technical field of sludge drying treatment, in particular to a non-heat drying method for sludge.
Background
Sludge, especially surplus sludge produced by urban sewage treatment plants, has the characteristics of high water content, high organic matter content, difficult dehydration, easy rancidity, odor generation and the like, and if the sludge is improperly treated, serious secondary pollution is caused, so that the sludge becomes an environmental problem commonly faced by various towns. The core problem of sludge treatment is the problem of dehydration, and the subsequent final treatment, such as incineration, pyrolysis, composting, landfill and the like, can be performed only by reducing the water content of the sludge to a certain level. The water content of the excess sludge generated by the sewage treatment plant is 80% -85%, the water content can be reduced to 50% -60% by adopting a pressurizing and dewatering treatment mode, and the water content can be reduced to 20% -40% by adopting a heat drying treatment mode.
At present, a heat drying method is adopted for drying sludge, and the main heat drying technology process comprises the following steps: an electric energy drying method, a hot water drying method, a steam drying method, a solar energy drying method, a gas drying method and a kiln flue gas waste heat drying method; in the drying method, the hot water drying method, the steam drying method and the kiln flue gas waste heat drying method all adopt waste heat generated in the production process of enterprises to dry sludge, and the heat drying methods have a common problem: the secondary pollution is serious, and odor and dust are generated in the treatment process, so that the sludge heat-free drying method is particularly important.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, the external heat supply is needed to assist the evaporation of water vapor in sludge in the sludge drying, the energy consumption of the drying mode is high, a large amount of odor and dust are generated in the drying process, and secondary pollution is easy to cause.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a method for heatless drying of sludge, the method comprising:
s1: delivering sludge to be treated into a high-speed dispersing machine to obtain sludge particles which are cut and dispersed to be smaller than 20 mm;
s2: delivering the dispersed sludge into a stirrer, adding a sludge dehydrating agent, and uniformly mixing the cut and dispersed sludge by the stirrer;
s3: conveying the uniformly mixed materials into an ultrasonic processor, and carrying out microscopic vibration treatment on the sludge;
s4: transferring the sludge treated in the step S3 to a reaction tank for stopping reaction for 10 minutes;
s5: transferring the reacted sludge to a squeezing device for dehydration, wherein the dehydration time is 10 minutes;
s6: transferring the sludge cake formed by the squeezing device to a crusher to crush and granulate the sludge cake;
s7: and finally, transferring the crushed sludge to a drying bin by a conveying device for air drying treatment, and completing the drying treatment of the sludge.
Preferably, the sludge dehydrating agent in the step S2 comprises a chemical conditioner and a physical conditioner, the chemical conditioner comprises trichloroisocyanuric acid and sodium hydroxide, the physical conditioner is biomass particles, the mixing time of the stirrer in the step S2 is 1 minute, and the stirring temperature in the step S2 is normal temperature.
Preferably, sodium hydroxide is added into the chemical conditioner in the step S2, the addition proportion is 0.1% -0.5% of the wet weight of the sludge, and trichloroisocyanuric acid is added, and the addition proportion is 0.5% -1.5% of the wet weight of the sludge.
Preferably, the particle size after crushing in the step S6 is less than 10mm.
Preferably, the conveying device in the step S7 is a belt conveyor and a bucket elevator.
Preferably, in the step S7, the ventilation temperature of the drying chamber is: the ambient temperature is higher than 0 ℃, and heating is not needed; the ambient temperature is lower than 0 ℃, the inlet air is heated to 10 ℃ to prevent the sludge from freezing, and the residence time in the drying bin is 5-8 hours.
Preferably, the filtrate formed by pressing in the step S5 is processed in the following manner: the heat-drying-free production line is built in a sewage treatment plant, and filtrate can be directly discharged to the pipeline inlet of the sewage treatment plant.
Preferably, the filtrate formed by pressing in the step S5 is processed in the following manner: when the heat-drying-free production line is built outside, the filtrate is required to be simply treated to reach the nano-tube standard and finally discharged to a municipal sewage pipe network.
Compared with the prior art, the invention has the advantages and positive effects that,
1. in the invention, in use, the water content of the sludge is reduced to below 40% by adopting chemical, physical and mechanical methods, so as to achieve the drying aim, no secondary pollution such as odor, dust and the like is generated in the treatment process, and the key for reducing the energy consumption of sludge drying is to remove as much water as possible by adopting a mechanical pressurizing method.
2. In the invention, in use, the sludge is conditioned by using the sludge dehydrating agent, so that the wall breaking treatment can be carried out on microorganisms in the sludge, the intracellular water is released, the extracellular polymer is decomposed, the viscosity of the water is reduced, the dehydration performance of the residual sludge can be effectively improved, and the water and solid particles in the residual sludge are easy to separate.
3. In the invention, the squeezing device is used for squeezing, the time for reaching the treatment target with the water content below 50% is only 10 minutes, which is 1/20 of that of the diaphragm filter press, and the dehydration efficiency is greatly improved; and the microstructure of the dehydrated mud cake is changed, and the mud cake is in a porous form, so that favorable conditions are created for subsequent drying treatment.
4. In the invention, in order to continuously remove the moisture in the sludge and meet the drying requirement of 40% of moisture content, a physical method is used, namely, the moisture in the sludge is further removed by a forced ventilation drying method, the sludge is not heated, the energy consumption is only about 1/8 of that of an electric heating drying method, and the energy saving effect is remarkable; in addition, the heating is not carried out, so that no odor is generated, and secondary pollution is avoided.
Drawings
FIG. 1 is a process flow diagram of a sludge heat-free drying method of the invention;
Detailed Description
In order that the above objects, features and advantages of the invention will be more clearly understood, a further description of the invention will be rendered by reference to the appended drawings and examples. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as described herein, and therefore the present invention is not limited to the specific embodiments of the disclosure that follow.
The invention provides a sludge heatless drying method, which comprises the following steps:
s1: delivering sludge to be treated into a high-speed dispersing machine to obtain sludge particles which are cut and dispersed to be smaller than 20 mm;
s2: delivering the dispersed sludge into a stirrer, adding a sludge dehydrating agent, and uniformly mixing the cut and dispersed sludge by the stirrer;
s3: conveying the uniformly mixed materials into an ultrasonic processor, and carrying out microscopic vibration treatment on the sludge;
s4: transferring the sludge treated in the step S3 to a reaction tank for stopping reaction for 10 minutes;
s5: transferring the reacted sludge to a squeezing device for dehydration, wherein the dehydration time is 10 minutes;
s6: transferring the sludge cake formed by the squeezing device to a crusher to crush and granulate the sludge cake;
s7: finally, transferring the crushed sludge to a drying bin by a conveying device for air drying treatment to finish the drying treatment of the sludge;
according to experiments of adding sodium hydroxide content and trichloroisocyanuric acid content with different weight ratios to achieve the water content of the sludge, referring to FIG. 1 specifically, the water content of the sludge is reduced to below 40% by adopting chemical, physical and mechanical methods, so that the drying aim is achieved. The drying method has the advantages of reducing energy consumption and cost, avoiding secondary pollution such as odor and dust in the treatment process, and reducing the energy consumption of sludge drying, wherein the key point is that the mechanical pressurizing method is adopted to remove as much water as possible, and compared with the heating drying dehydration method, the mechanical pressurizing dehydration has higher dehydration efficiency. While two main factors for improving the mechanical pressurizing and dewatering efficiency are the dewatering performance of the sludge itself and the performance of the mechanical pressurizing and dewatering equipment,
in order to improve the dehydration performance of the sludge, the invention uses a chemical method, namely, the sludge is conditioned by a sludge dehydrating agent, so that microorganisms in the sludge can be subjected to wall breaking treatment, intracellular water is released, extracellular polymers are decomposed, the viscosity of the water is reduced, the dehydration performance of the residual sludge can be effectively improved, and the water and solid particles in the residual sludge are easy to separate;
the evenly mixed materials are conveyed into an ultrasonic processor, and microscopic vibration treatment is carried out on the sludge, so that the separation effect of the moisture and solid particles in the sludge is further improved;
in order to improve the performance of mechanical pressurizing and dewatering equipment, the invention uses the omnidirectional water outlet dynamic sealing sludge squeezer to squeeze the conditioned sludge, the time for reaching the treatment target with the water content below 50% is only 10 minutes, which is 1/20 of that of a diaphragm filter press, and the dewatering efficiency is greatly improved; the microstructure of the dehydrated mud cake is changed, the mud cake is in a porous form, and favorable conditions are created for subsequent drying treatment, the device for squeezing and dehydrating the mud cake is an authorized patent, the patent number is 2022107144906, the specific squeezing process and the specific structure of the squeezing device in a mud squeezer with a distributed squeezing unit are described in the patent, and the detailed description of the device is omitted; in order to continuously remove the water in the sludge and meet the drying requirement of 40% of water content, the invention uses a physical method, namely a forced ventilation drying method to further remove the water in the sludge, and the energy consumption is only about 1/8 of that of an electric heating drying method without heating, so that the energy-saving effect is remarkable; and the heating is not carried out, so that odor is not generated, and secondary pollution is avoided.
Example 1:
in the step S1, the sludge to be treated is conveyed into a high-speed disperser, the sludge agglomerates are cut and dispersed to obtain sludge particles which are cut and dispersed to be smaller than 20mm,
the sludge dehydrating agent in the step S2 comprises trichloroisocyanuric acid and sodium hydroxide, wherein the trichloroisocyanuric acid is a strong oxidant, oxygen in an atomic state can be released when the trichloroisocyanuric acid reacts with water, the oxygen has a strong oxidation effect, the cell walls of the sludge can break walls under the action of the strong oxidant, intracellular bound water is released, the dehydration rate of the sludge can be greatly improved, and the sodium hydroxide is a strong base for adjusting the pH value of the sludge. The oxidation reaction is required to be carried out in a proper acid-base environment, and most of the sludge is acidic, so that sodium hydroxide is added to adjust the pH value of the sludge, thereby providing a proper reaction environment for cell wall breaking;
in actual use, firstly, sodium hydroxide is added, the adding proportion is 0.1% -0.5% of the wet weight of the sludge, then trichloroisocyanuric acid is added, the adding proportion is 0.5% -1.5% of the wet weight of the sludge, the specific adding proportion of the sodium hydroxide and the trichloroisocyanuric acid is adaptively adjusted according to the weight of the sludge to be treated, and the water content of the sludge caused by the content of the sodium hydroxide and the trichloroisocyanuric acid under different proportions is different according to the following table:
| sequence number | Sodium hydroxide content | Trichloroisocyanuric acid content | Sludge moisture content |
| 1 | 0.1% | 1.35% | 35% |
| 2 | 0.3% | 1.1% | 36% |
| 3 | 0.5% | 0.65% | 39% |
The physical conditioner is biomass particles, the mixing time of the stirrer in the step S1 is 1 minute, the stirring temperature in the step S1 is normal temperature,
the chemical conditioner is added to achieve the effects that most of water in the sludge is in microbial cells, in order to improve the dehydration performance of the sludge, the water in the microbial cells is released, cell walls belong to organic substances, chemical reaction is carried out under the action of an oxidant, the cell wall structure is destroyed, the cell walls are broken, the water in the cells can be released, and the water in the sludge can be separated out by adding the chemical conditioner into a stirrer. The method can break the wall of microorganisms in the sludge, release the water in cells, decompose extracellular polymers, reduce the viscosity of the water, and effectively improve the dehydration performance of the residual sludge, so that the water and solid particles in the residual sludge are easy to separate.
S3, conveying the uniformly mixed materials into an ultrasonic processor, carrying out microscopic vibration treatment on the sludge, further improving the separation effect of the water and solid particles in the sludge,
in the step S7, the ventilation temperature of the drying bin is: the ambient temperature is higher than 0 ℃, and heating is not needed; the environment temperature is lower than 0 ℃, the inlet air is heated to 10 ℃ to prevent the sludge from freezing, the residence time in the drying bin is 5-8 hours, the heating temperature supports the air drying treatment in the drying bin, but the drying air at 10 ℃ in the air drying bin does not cause odor generation and secondary pollution,
the effect that its whole embodiment 1 reaches is, in use, the setting in air-dry storehouse carries out forced draft wind desiccation to the mud after the breakage and further desorption moisture in the mud, and above zero degree centigrade, the dry wind in the desiccation storehouse does not need to heat, uses phase transition principle and heat and humidity exchange principle, and the mud after squeezing the dehydration is carried to air-dry storehouse top after the breakage, is promoted by rotatory rake teeth after entering air-dry storehouse, distributes to each layer, and every layer of mud piles up thickness and is less than 100mm, and the desiccation in-process, the rake teeth constantly turn over mud, does benefit to moisture and evaporates fast. The induced draft fan draws out the air that contains moisture, and mud obtains the mummification gradually, and under isenthalpic condition, utilizes the difference of vapor partial pressure in the air and the saturated vapor partial pressure of the moisture boundary layer in mud cake, carries out the desorption to the moisture in the mud cake, directly air-dries the processing to mud, can not produce the foul smell in the air-drying process, when being less than zero degrees centigrade, heats up the wind of drying, and the purpose of heating up guarantees that the mud in the air-drying storehouse is not frozen, guarantees that air-drying work normally goes on can, can not produce the foul smell.
The treatment mode of the filtrate formed by pressing in the step S5 is as follows: a. the heat-free drying treatment production line is built in a sewage treatment plant and is directly discharged to a pipeline inlet of the sewage treatment plant; b. when the heat-free drying treatment production line is built outside, the filtrate needs to be simply treated to reach the nano tube standard and finally discharged to a municipal sewage pipe network,
the whole embodiment of the method achieves the effects that in use, the filtrate generated in the step S3 is correspondingly treated according to different scenes, when the heat-free drying treatment production line is built in a sewage treatment plant, the filtrate is directly discharged without treatment, and when the filtrate is built in other areas, the filtrate is discharged after being treated, so that secondary pollution is avoided.
In conclusion, the invention adopts chemical, physical and mechanical methods to reduce the water content of the sludge to below 40 percent, thereby achieving the drying aim. The drying method has the advantages that the energy consumption and the cost are reduced, secondary pollution such as odor and dust is not generated in the treatment process, the key point of reducing the sludge drying energy consumption is that the mechanical pressurizing method is adopted to remove as much water as possible, compared with the heating drying dehydration method, the mechanical pressurizing dehydration has higher dehydration efficiency, the sludge dehydrating agent (the chemical conditioner and the physical conditioner described in the step S2) is used to condition the sludge, the microorganism in the sludge can be subjected to wall breaking treatment, the intracellular water is released, the extracellular polymer is decomposed, the viscosity of the water is reduced, the dehydration performance of the residual sludge can be effectively improved, the water and solid particles in the residual sludge are easy to separate, the omnidirectional water-outlet dynamic sealing sludge squeezer is used to squeeze the conditioned sludge, the time for reaching the treatment target of 50% or less is only 10 minutes, the dehydration efficiency is 1/20 of that of a diaphragm filter press, the whole sludge is subjected to drying process without external heat, the sludge drying treatment efficiency is high, the treatment process is concise and high in efficiency, secondary environment pollution is not caused, and the production cost of enterprises is reduced.
Claims (8)
1. The sludge heatless drying method is characterized by comprising the following steps of:
s1: delivering sludge to be treated into a high-speed dispersing machine to obtain sludge particles which are cut and dispersed to be smaller than 20 mm;
s2: delivering the dispersed sludge into a stirrer, adding a sludge dehydrating agent, and uniformly mixing the cut and dispersed sludge by the stirrer;
s3: conveying the uniformly mixed materials into an ultrasonic processor, and carrying out microscopic vibration treatment on the sludge;
s4: transferring the sludge treated in the step S3 to a reaction tank for stopping reaction for 10 minutes;
s5: transferring the reacted sludge to a squeezing device for dehydration, wherein the dehydration time is 10 minutes;
s6: transferring the sludge cake formed by the squeezing device to a crusher to crush and granulate the sludge cake;
s7: and finally, transferring the crushed sludge to a drying bin by a conveying device for air drying treatment, and completing the drying treatment of the sludge.
2. The method for non-heat drying sludge according to claim 1, wherein the sludge dehydrating agent in the step S2 comprises a chemical conditioner and a physical conditioner, the chemical conditioner comprises trichloroisocyanuric acid and sodium hydroxide, the physical conditioner is biomass particles, the mixing time of the mixer in the step S2 is 1 minute, and the mixing temperature in the step S2 is normal temperature.
3. The method for non-heat drying sludge according to claim 2, wherein sodium hydroxide is added to the chemical conditioning agent in the step S2, the addition weight ratio is 0.1% -0.5% of the wet weight of the sludge, and trichloroisocyanuric acid is added, and the addition weight ratio is 0.5% -1.5% of the wet weight of the sludge.
4. The method according to claim 1, wherein the size of the crushed sludge in the step S6 is less than 10mm.
5. The method according to claim 1, wherein the conveying device in the step S7 is a belt conveyor or a bucket elevator.
6. The method according to claim 1, wherein in the step S7: when the ambient temperature is lower than 0 ℃, the inlet air is heated to 10 ℃ to prevent the sludge from freezing, and the residence time in the drying bin is 5-8 hours.
7. The method for non-heat drying sludge according to claim 1, wherein the treatment mode of the filtrate formed by the pressing in the step S5 is as follows: the heat-free drying treatment production line is built in a sewage treatment plant, and filtrate can be directly discharged to the pipeline inlet of the sewage treatment plant.
8. The method for non-heat drying sludge according to claim 1, wherein the treatment mode of the filtrate formed by the pressing in the step S5 is as follows: when the heat-drying-free production line is built outside, the filtrate is required to be simply treated to reach the nano-tube standard and finally discharged to a municipal sewage pipe network.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117361838A (en) * | 2023-10-16 | 2024-01-09 | 秦皇岛尼科环境科技有限公司 | Sludge heatless drying method based on multidirectional air drying box |
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| EP3539932A1 (en) * | 2018-03-16 | 2019-09-18 | Ulrich Kubinger | Method for optimizing the dewatering of sludge from a biological purification process |
| CN111153579A (en) * | 2018-11-07 | 2020-05-15 | 张晓春 | Sludge heatless drying method and device system thereof |
| CN111825304A (en) * | 2020-06-02 | 2020-10-27 | 昆明理工大学 | Method for reducing municipal sludge moisture content by using ultrasonic and self-made dehydrating agent |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108101329A (en) * | 2016-11-25 | 2018-06-01 | 中国石油化工股份有限公司 | A kind of excess sludge anaerobism desiccation treatment process |
| EP3539932A1 (en) * | 2018-03-16 | 2019-09-18 | Ulrich Kubinger | Method for optimizing the dewatering of sludge from a biological purification process |
| CN108996875A (en) * | 2018-09-12 | 2018-12-14 | 天津壹新环保工程有限公司 | A kind of sludge deodorization system and method |
| CN111153579A (en) * | 2018-11-07 | 2020-05-15 | 张晓春 | Sludge heatless drying method and device system thereof |
| CN111825304A (en) * | 2020-06-02 | 2020-10-27 | 昆明理工大学 | Method for reducing municipal sludge moisture content by using ultrasonic and self-made dehydrating agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117361838A (en) * | 2023-10-16 | 2024-01-09 | 秦皇岛尼科环境科技有限公司 | Sludge heatless drying method based on multidirectional air drying box |
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Application publication date: 20230425 |