CN113087363A - Deep dehydration method for biogas residues - Google Patents
Deep dehydration method for biogas residues Download PDFInfo
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- CN113087363A CN113087363A CN202110358680.4A CN202110358680A CN113087363A CN 113087363 A CN113087363 A CN 113087363A CN 202110358680 A CN202110358680 A CN 202110358680A CN 113087363 A CN113087363 A CN 113087363A
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- 230000018044 dehydration Effects 0.000 title claims abstract description 32
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 230000003750 conditioning effect Effects 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 22
- 230000001143 conditioned effect Effects 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims description 11
- 239000012065 filter cake Substances 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 8
- 229920002401 polyacrylamide Polymers 0.000 claims description 7
- 239000010865 sewage Substances 0.000 claims description 7
- 239000003814 drug Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 238000005189 flocculation Methods 0.000 claims description 6
- 230000016615 flocculation Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 3
- 238000009835 boiling Methods 0.000 claims description 3
- 238000004332 deodorization Methods 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000003834 intracellular effect Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000002352 surface water Substances 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 9
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 9
- 239000010806 kitchen waste Substances 0.000 abstract description 9
- 239000004571 lime Substances 0.000 abstract description 9
- 229910021578 Iron(III) chloride Inorganic materials 0.000 abstract description 5
- 238000003900 soil pollution Methods 0.000 abstract description 4
- 239000003054 catalyst Substances 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 14
- 230000007547 defect Effects 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 238000000855 fermentation Methods 0.000 description 3
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N hydrogen peroxide Substances OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- C02F11/15—Treatment of sludge; Devices therefor by de-watering, drying or thickening by treatment with electric, magnetic or electromagnetic fields; by treatment with ultrasonic waves
-
- 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
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
-
- 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
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
-
- 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
- C02F11/16—Treatment of sludge; Devices therefor by de-watering, drying or thickening using drying or composting beds
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a deep dehydration method of biogas residues, which comprises the following specific steps: firstly, performing ultrasonic conditioning on biogas residues; secondly, dehydrating the conditioned biogas residues by using a high-pressure diaphragm plate-and-frame filter press; and (III) carrying out micro-negative pressure low-temperature heat drying treatment on the dehydrated biogas residues. The invention effectively solves the problem of high water content of the biogas residue after the traditional centrifugal dehydration in the kitchen waste industry, avoids soil pollution caused by lime addition conditioning, and reduces the conditioning agent FeCl3The dosage of the catalyst reduces the corrosion of equipment.
Description
Technical Field
The invention relates to the technical field of biogas residue dehydration, in particular to a deep dehydration method for biogas residue.
Background
The kitchen waste mainly refers to residual waste generated in the daily life process of residents, and the residual waste is easy to rot and deteriorate and emits foul smell. The existing common treatment technology for the kitchen waste is an anaerobic fermentation technology, the kitchen waste can be degraded, and simultaneously, methane can be recycled as biomass energy. The biogas residues after anaerobic fermentation of the kitchen waste are dehydrated to reduce the water content, which is the premise of subsequent treatment and utilization of the biogas residues.
At present, the conventional kitchen waste biogas residue dehydration mode adopts centrifugal dehydration, the water content after dehydration is about 80%, and the dehydrated biogas residue has high weight, so that the transportation cost is high, and the resource utilization is difficult. The kitchen waste biogas residue dehydration mode also adopts a mode of plate-frame dehydration after conditioning of ferric trichloride and lime, and adding lime for conditioning can increase the dry basis yield of the biogas residue, but also increases the subsequent transportation and disposal cost; the dehydrated biogas residues are further because of the addition of lime, and the acid-base property of soil is affected no matter the biogas residues are buried or composted, so that the subsequent treatment and utilization are greatly limited.
Disclosure of Invention
Aiming at the defects of the prior art, the invention solves the technical problems that the water content of the dehydrated biogas residues is high, and the soil pollution is caused after lime is added for conditioning.
In order to solve the technical problems, the technical scheme adopted by the invention is a deep dehydration method of biogas residues, which comprises the following specific steps:
firstly, ultrasonic conditioning is carried out on biogas residues, an ultrasonic conditioning area is arranged in a biogas residue conditioning tank, 20KHz ultrasonic waves are input to carry out cell disruption on the biogas residues, and by destroying a stable floc particle structure of the biogas residues, surface water and intracellular water of an extracellular stable structure can be released, organic matters can be degraded, and the flocculation effect is improved;
further, FeCl with the effective mass concentration of 38 percent is added into the conditioning tank3Mixing the solution and the biogas residues for about 60min to improve the dehydration performance;
secondly, dehydrating the conditioned biogas residues by using a high-pressure diaphragm plate-and-frame filter press, feeding the conditioned biogas residues by using a high-pressure and low-pressure feeding pump in a high-pressure and low-pressure two-stage feeding mode, adding polyacrylamide liquid medicine by using a pipeline mixer during feeding to enhance the flocculation effect and improve the dehydration performance, introducing high-pressure water into a diaphragm to perform squeezing dehydration to reduce the water content of a filter cake after a filter chamber is filled with the filter cake, introducing compressed air into the filter chamber by using an air compressor after squeezing is finished to continuously reduce the water content of the filter cake, discharging the material after the core blowing is finished, entering a low-temperature heat drying process, and discharging filtrate into a biogas slurry sewage treatment system;
preferably, the feeding pressure of the low pressure section is 0.6MPa, the feeding pressure of the high pressure section is 1.6MPa, and the high pressure water pressure is 2.5 MPa.
Preferably, the polyacrylamide is a dry powder medicament, the dosage is about 2 kg/ton of dry biogas residue, and the proportioning concentration is 1-4 per mill.
Further, the biogas slurry after the dehydration of the biogas residues is recycled after being treated by an efficient biogas slurry sewage treatment system.
And (III) carrying out micro negative pressure low-temperature heat drying treatment on the dehydrated biogas residues, adopting a straight-in straight-out type feeding mode, avoiding repeated heating by considering back mixing of dry materials at the rear end of a drying device, dehydrating the biogas residues through a high-pressure diaphragm plate-and-frame filter press, inputting the dehydrated biogas residues into a dryer through a conveyor, introducing low-temperature gas with the temperature of 85 ℃ into the dryer, enabling the low-temperature gas flow to enter an inner layer of the biogas residues and then drying at the temperature of 75 ℃, enabling the biogas residues to move like fluid boiling solid particles in a heated state, providing heat required by drying through a heat exchanger in the device, recovering the low-temperature gas serving as a high-efficiency heat exchange medium in a micro negative pressure state after heat exchange, enabling the low-temperature gas to enter a deodorization system through a pipeline, enabling water in the biogas residues to be evaporated in the fluid movement, enabling the biogas residues to enter a biogas residue storage bin, and discharging the water recovered.
Preferably, the direction of the low-temperature gas introduced into the drier body is in a counter-current relationship with the direction of the biogas residues entering the drier body.
Still further, the flow rate of the cryogenic gas is controlled so that the biogas residue is maintained in a suspended state rather than in a transport state.
Compared with the prior art, the invention comprises the following steps:
(I) ultrasonic wave and FeCl are adopted3The solution is conditioned, so that the acid-base property of the biogas residues is prevented from being greatly changed, the resource utilization of the biogas residues at the later stage is facilitated, the economic value of the biogas residues is improved, and the defect that the biogas residues are difficult to utilize and dispose due to the condition of only adding lime is overcome; but also can destroy and destabilize the floc structure of the biogas residue, promote the dissolution of organic matters in the floc of the biogas residue, improve the dehydration performance of the biogas residue and effectively reduce FeCl3The amount of the solution used;
secondly, the water content of the dehydrated biogas residues is effectively reduced by utilizing the feeding pressure and the squeezing pressure of the high-pressure diaphragm filter press, and the energy consumption of heat drying is saved;
in conclusion, the method effectively solves the problem of high water content of the biogas residues after the traditional centrifugal dehydration in the kitchen waste industry, avoids soil pollution caused by lime addition for conditioning, and reduces the conditioning agent FeCl3The dosage of the catalyst reduces the corrosion of equipment.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The following description will be made with reference to the accompanying drawings, but the present invention is not limited thereto.
Fig. 1 shows a deep dehydration method of biogas residues, which comprises the following specific steps:
firstly, ultrasonic conditioning is carried out on biogas residues, an ultrasonic conditioning area is arranged in a biogas residue conditioning tank, 20KHz ultrasonic waves are input to carry out cell disruption on the biogas residues, and by destroying a stable floc particle structure of the biogas residues, surface water and intracellular water of an extracellular stable structure can be released, organic matters can be degraded, and the flocculation effect is improved; the working principle is as follows:
the biogas slurry after anaerobic fermentation of the kitchen is used for producing H & OH & under the action of ultrasonic waves, namely hydrogen radical and hydroxyl radical, the hydrogen radical and oxygen can be used for producing hydrogen peroxide radicals through the ultrasonic action, and the hydroxyl radical and the hydrogen peroxide radicals have strong oxidizing capability, can degrade a part of organic matters, promote the dissolution of organic matters of biogas residue flocs, and improve the dehydration performance of the biogas residue.
Further, FeCl with the effective mass concentration of 38 percent is added into the conditioning tank3Mixing the solution and the biogas residues for about 60min to improve the dehydration performance;
secondly, dehydrating the conditioned biogas residues by using a high-pressure diaphragm plate-and-frame filter press, feeding the conditioned biogas residues by using a high-pressure and low-pressure feeding pump in a high-pressure and low-pressure two-stage feeding mode, adding polyacrylamide liquid medicine by using a pipeline mixer during feeding to enhance the flocculation effect and improve the dehydration performance, introducing high-pressure water into a diaphragm to perform squeezing dehydration to reduce the water content of a filter cake after a filter chamber is filled with the filter cake, introducing compressed air into the filter chamber by using an air compressor after squeezing is finished to continuously reduce the water content of the filter cake, discharging the material after the core blowing is finished, entering a low-temperature heat drying process, and discharging filtrate into a biogas slurry sewage treatment system; the water content of the biogas residue after dehydration by the high-pressure diaphragm plate-and-frame filter press can be reduced to 60 percent.
Preferably, the feeding pressure of the low pressure section is 0.6MPa, the feeding pressure of the high pressure section is 1.6MPa, and the high pressure water pressure is 2.5 MPa.
Preferably, the polyacrylamide is a dry powder medicament, the dosage is about 2 kg/ton of dry biogas residue, and the proportioning concentration is 1-4 per mill.
Further, the biogas slurry after the dehydration of the biogas residues is recycled after being treated by an efficient biogas slurry sewage treatment system.
Thirdly, carrying out micro-negative pressure low-temperature heat drying treatment on the dehydrated biogas residues, adopting direct-in and direct-out feeding without considering the back mixing of dry materials at the rear end of drying equipment to avoid repeated heating, dehydrating the biogas residues through a high-pressure diaphragm plate-and-frame filter press, the biogas residue is conveyed into a dryer through a conveyor, low-temperature gas with the temperature of 85 ℃ is introduced into the dryer, the drying temperature of the low-temperature gas flow is 75 ℃ after the low-temperature gas flow enters the inner layer of the biogas residue, the biogas residue is in a solid particle motion like fluid boiling in a heated state, heat required by drying is provided by a heat exchanger in the device, the low-temperature gas is taken as a high-efficiency heat exchange medium, the low-temperature gas is recovered in a micro negative pressure state after heat exchange and enters a deodorization system through a pipeline, water in the biogas residue is evaporated in the motion of the fluid, the biogas residue enters a biogas residue bin, the water recovered by the condenser is discharged back to the biogas slurry sewage treatment system, and the water content of the biogas residue after the micro-negative pressure low-temperature heat drying treatment can be reduced to below 40%.
Preferably, the direction of the low-temperature gas introduced into the drier body is in a counter-current relationship with the direction of the biogas residues entering the drier body.
Still further, the flow rate of the cryogenic gas is controlled so that the biogas residue is maintained in a suspended state rather than in a transport state.
In the heat drying treatment process, because a low-temperature drying process is adopted, the internal air temperature is less than 90 ℃, the volatilization amount of organic matters and other harmful gases is greatly reduced, and the whole heat drying treatment process is more environment-friendly.
Compared with the prior art, the invention comprises the following steps:
(I) ultrasonic wave and FeCl are adopted3The solution is conditioned, so that the acid-base property of the biogas residues is prevented from being greatly changed, the resource utilization of the biogas residues at the later stage is facilitated, the economic value of the biogas residues is improved, and the defect that the biogas residues are difficult to utilize and dispose due to the condition of only adding lime is overcome; but also can destroy and destabilize the floc structure of the biogas residue, promote the dissolution of organic matters of the biogas residue floc, improve the dehydration performance of the biogas residue and effectively reduce the dosage of FeCl3 solution;
secondly, the water content of the dehydrated biogas residues is effectively reduced by utilizing the feeding pressure and the squeezing pressure of the high-pressure diaphragm filter press, and the energy consumption of heat drying is saved;
in conclusion, the method effectively solves the problem of high water content of the biogas residues after the traditional centrifugal dehydration in the kitchen waste industry, avoids soil pollution caused by lime addition for conditioning, and reduces the conditioning agent FeCl3The dosage of the catalyst reduces the corrosion of equipment.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention.
Claims (7)
1. The deep dehydration method of the biogas residues is characterized by comprising the following specific steps:
firstly, ultrasonic conditioning is carried out on biogas residues, an ultrasonic conditioning area is arranged in a biogas residue conditioning tank, 20KHz ultrasonic waves are input to carry out cell disruption on the biogas residues, and by destroying a stable floc particle structure of the biogas residues, surface water and intracellular water of an extracellular stable structure can be released, organic matters can be degraded, and the flocculation effect is improved;
secondly, dehydrating the conditioned biogas residues by using a high-pressure diaphragm plate-and-frame filter press, feeding the conditioned biogas residues by using a high-pressure and low-pressure feeding pump in a high-pressure and low-pressure two-stage feeding mode, adding polyacrylamide liquid medicine by using a pipeline mixer during feeding to enhance the flocculation effect and improve the dehydration performance, introducing high-pressure water into a diaphragm to perform squeezing dehydration to reduce the water content of a filter cake after a filter chamber is filled with the filter cake, introducing compressed air into the filter chamber by using an air compressor after squeezing is finished to continuously reduce the water content of the filter cake, discharging the material after the core blowing is finished, entering a low-temperature heat drying process, and discharging filtrate into a biogas slurry sewage treatment system;
and (III) carrying out micro negative pressure low-temperature heat drying treatment on the dehydrated biogas residues, adopting a straight-in straight-out type feeding mode, avoiding repeated heating by considering back mixing of dry materials at the rear end of a drying device, dehydrating the biogas residues through a high-pressure diaphragm plate-and-frame filter press, inputting the dehydrated biogas residues into a dryer through a conveyor, introducing low-temperature gas with the temperature of 85 ℃ into the dryer, enabling the low-temperature gas flow to enter an inner layer of the biogas residues and then drying at the temperature of 75 ℃, enabling the biogas residues to move like fluid boiling solid particles in a heated state, providing heat required by drying through a heat exchanger in the device, recovering the low-temperature gas serving as a high-efficiency heat exchange medium in a micro negative pressure state after heat exchange, enabling the low-temperature gas to enter a deodorization system through a pipeline, enabling water in the biogas residues to be evaporated in the fluid movement, enabling the biogas residues to enter a biogas residue storage bin, and discharging the water recovered.
2. The deep dehydration method of biogas residue according to claim 1, characterized in that in the step (one), FeCl with an effective mass concentration of 38% is added into the conditioning tank3The solution is mixed with the biogas residue for about 60min to improve the dewatering performance.
3. The method for deeply dehydrating the biogas residues according to claim 1, wherein in the step (two), the feeding pressure of the low-pressure section is 0.6MPa, the feeding pressure of the high-pressure section is 1.6MPa, and the high-pressure water pressure is 2.5 MPa.
4. The method for deeply dehydrating the biogas residues according to claim 1, wherein in the second step, the polyacrylamide is a dry powder medicament, the dosage of the polyacrylamide is about 2 kg/ton of dry biogas residues, and the proportioning concentration is 1-4 per mill.
5. The method for deeply dehydrating the biogas residues according to claim 1, wherein in the step (II), the biogas slurry dehydrated by the biogas residues is treated by a high-efficiency biogas slurry sewage treatment system and then recycled.
6. The method for deeply dehydrating the biogas residues according to claim 1, wherein in the third step, the low-temperature gas is introduced into the drier body in a countercurrent relationship with the direction of the biogas residues entering the drier body.
7. The deep dehydration method of biogas residue according to claim 6, characterized in that in the third step, the flow rate of the low-temperature gas is controlled so that the biogas residue is kept in a suspension state rather than a transportation state.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115215518A (en) * | 2022-07-07 | 2022-10-21 | 中冶生态环保集团有限公司 | Ultrasonic-microwave combined sludge reduction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115215518A (en) * | 2022-07-07 | 2022-10-21 | 中冶生态环保集团有限公司 | Ultrasonic-microwave combined sludge reduction method |
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