CN113716786A - Leachate recycling system and leachate recycling method - Google Patents
Leachate recycling system and leachate recycling method Download PDFInfo
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- CN113716786A CN113716786A CN202111163286.1A CN202111163286A CN113716786A CN 113716786 A CN113716786 A CN 113716786A CN 202111163286 A CN202111163286 A CN 202111163286A CN 113716786 A CN113716786 A CN 113716786A
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- 238000004064 recycling Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000010865 sewage Substances 0.000 claims abstract description 70
- 238000010438 heat treatment Methods 0.000 claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 238000001704 evaporation Methods 0.000 claims abstract description 47
- 239000002002 slurry Substances 0.000 claims abstract description 39
- 230000008020 evaporation Effects 0.000 claims abstract description 36
- 238000010564 aerobic fermentation Methods 0.000 claims abstract description 32
- 238000001728 nano-filtration Methods 0.000 claims abstract description 30
- 238000003825 pressing Methods 0.000 claims abstract description 30
- 239000007787 solid Substances 0.000 claims abstract description 30
- 239000012153 distilled water Substances 0.000 claims abstract description 26
- 238000000926 separation method Methods 0.000 claims abstract description 26
- 239000004519 grease Substances 0.000 claims abstract description 23
- 230000018044 dehydration Effects 0.000 claims abstract description 20
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 20
- 239000012065 filter cake Substances 0.000 claims abstract description 12
- 239000003895 organic fertilizer Substances 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims description 29
- 239000002893 slag Substances 0.000 claims description 25
- 238000005406 washing Methods 0.000 claims description 25
- 239000002351 wastewater Substances 0.000 claims description 16
- 239000012530 fluid Substances 0.000 claims description 15
- 239000002253 acid Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 9
- 239000002028 Biomass Substances 0.000 claims description 8
- 239000002585 base Substances 0.000 claims description 8
- 230000003750 conditioning effect Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 5
- 239000003225 biodiesel Substances 0.000 claims 1
- 239000000706 filtrate Substances 0.000 claims 1
- 239000005416 organic matter Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000010806 kitchen waste Substances 0.000 description 7
- 238000005496 tempering Methods 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- 239000010813 municipal solid waste Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 4
- 239000002910 solid waste Substances 0.000 description 4
- 238000000855 fermentation Methods 0.000 description 3
- 230000004151 fermentation Effects 0.000 description 3
- 239000003337 fertilizer Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 102000004169 proteins and genes Human genes 0.000 description 3
- 108090000623 proteins and genes Proteins 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 2
- 239000002068 microbial inoculum Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000005201 scrubbing Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K10/00—Animal feeding-stuffs
- A23K10/10—Animal feeding-stuffs obtained by microbiological or biochemical processes
- A23K10/12—Animal feeding-stuffs obtained by microbiological or biochemical processes by fermentation of natural products, e.g. of vegetable material, animal waste material or biomass
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23N—MACHINES OR APPARATUS FOR TREATING HARVESTED FRUIT, VEGETABLES OR FLOWER BULBS IN BULK, NOT OTHERWISE PROVIDED FOR; PEELING VEGETABLES OR FRUIT IN BULK; APPARATUS FOR PREPARING ANIMAL FEEDING- STUFFS
- A23N17/00—Apparatus specially adapted for preparing animal feeding-stuffs
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F9/00—Fertilisers from household or town refuse
- C05F9/04—Biological compost
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
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Abstract
The invention discloses a leachate recycling treatment system and a leachate recycling treatment method. The steam generating device outputs heating steam to the evaporating device, the percolate heating device and the aerobic fermentation device, and the percolate is heated by the percolate preheating device and the percolate heating device and then enters the oil-water residue separation device to be separated into oil-water residue separation sewage, grease and solid residue; the oil-water-residue separation sewage enters an evaporation device to discharge distilled water and dried slurry, a filter-pressing dehydration device performs filter pressing on the dried slurry to discharge filter-pressing dehydrated sewage and filter cakes, an aerobic fermentation device performs aerobic fermentation on the filter cakes to output tail gas condensate water and organic fertilizer or feed, and a nanofiltration device filters the distilled water and discharges the distilled water after reaching the standard. Organic matter resource utilization improves resource utilization rate.
Description
Technical Field
The invention relates to the technical field of garbage treatment equipment, in particular to a leachate recycling treatment system and a leachate recycling treatment method.
Background
The kitchen waste contains kitchen waste, household kitchen waste and other kitchen waste. Along with the kitchen waste separation amount is more and more, the kitchen waste leachate amount is more and more, and the disposal difficulty is also more and more big.
At present, the existing kitchen garbage leachate treatment technology has the problems of high equipment investment cost, high operation cost and incomplete disposal, and can not meet the requirement of a national garbage classification system. The treatment of the kitchen waste leachate generates a large amount of solid waste which needs to be transported for incineration or landfill, and the resource utilization rate is not high.
Therefore, how to improve the resource utilization rate is an urgent problem to be solved by those skilled in the art.
Disclosure of Invention
In view of this, the present invention provides a leachate recycling treatment system to improve the recycling utilization rate.
In order to achieve the purpose, the invention provides the following technical scheme:
a leachate recycling treatment system, comprising:
the leachate preheating device is provided with a leachate preheating inlet for leachate to enter and a leachate preheating outlet for the leachate to flow out;
the leachate heating device is provided with a leachate heating inlet and a leachate heating outlet, and the leachate heating inlet is communicated with the leachate preheating outlet;
the inlet of the oil-water-slag separating device is communicated with the percolate heating outlet, and the oil-water-slag separating device is also provided with a first sewage outlet for discharging oil-water-slag separated sewage, a grease outlet for discharging grease and a solid slag outlet for discharging solid slag;
the evaporation device is provided with a sewage inlet communicated with the first sewage outlet, a distilled water outlet for discharging distilled water and a slurry outlet for discharging dried slurry;
a filter-pressing dehydration device, which is provided with a filter-pressing material inlet communicated with the slurry outlet and the solid slag outlet, a second sewage outlet for discharging filter-pressing dehydration sewage and a filter cake outlet for discharging a filter cake, wherein the second sewage outlet is communicated with the sewage inlet;
the aerobic fermentation device is provided with an aerobic fermentation inlet communicated with the filter cake outlet, a tail gas condensate outlet used for discharging tail gas condensate, and an aerobic fermentation outlet used for outputting organic fertilizer or feed, and the tail gas condensate outlet is communicated with the sewage inlet;
the nanofiltration device is provided with a nanofiltration inlet, a nanofiltration sewage outlet and a standard wastewater discharge port, the nanofiltration inlet is communicated with the distilled water outlet, and the nanofiltration sewage outlet is communicated with the sewage inlet;
and the heating steam output by the steam generating device is conveyed to the heating fluid inlet of the evaporating device, the heating fluid inlet of the percolate heating device and the heating fluid inlet of the aerobic fermentation device.
Optionally, the leachate recycling treatment system further comprises a compressor, an inlet of the compressor is communicated with the low-temperature steam port of the evaporation device, and an outlet of the compressor is communicated with the high-temperature steam port of the evaporation device.
Optionally, the leachate recycling system further comprises an acid-base washing assembly disposed between the low-temperature steam port of the evaporation device and the inlet of the compressor.
Optionally, in the leachate recycling system, the acid-base washing assembly includes:
the inlet of the defoaming device is communicated with the low-temperature steam port of the evaporation device;
the inlet of the acid washing device is communicated with the outlet of the defoaming device;
and the inlet of the alkaline washing device is communicated with the outlet of the acid washing device, and the outlet of the alkaline washing device is communicated with the inlet of the compressor.
Optionally, the leachate recycling system further comprises a homogenizing tank having a first inlet communicated with the solid slag discharge port, a second inlet communicated with the slurry outlet, and a solid slag slurry outlet communicated with the filter press inlet.
Optionally, in the leachate recycling system, an oil storage tank is further included, an inlet of the oil storage tank is communicated with the grease discharge port, and an outlet of the oil storage tank is used for discharging the biomass diesel raw material.
Optionally, the leachate recycling system further comprises a conditioning tank, wherein the conditioning tank is provided with a conditioning inlet communicated with the first sewage outlet, the second sewage outlet, the tail gas condensate outlet and the nanofiltration sewage outlet, and a conditioning outlet communicated with the sewage inlet.
The embodiment of the invention also provides a leachate recycling treatment method, which comprises the following steps:
1) heating the percolate;
2) and carrying out oil-water-residue separation on the heated percolate, taking the separated grease as a biomass diesel raw material, evaporating the separated oil-water-residue separated sewage to generate dried slurry, and carrying out aerobic fermentation on the dried slurry and the separated solid residue to generate an organic fertilizer or feed.
Optionally, in the method for recycling leachate, before the step 1), the leachate is preheated, and a preheating heat source is distilled water generated by evaporating the oil-water residue separation wastewater.
Optionally, in the leachate recycling method, in step 2), before the dried slurry and the solid residues are subjected to aerobic fermentation, filter pressing and dehydration are performed on the dried slurry and the solid residues.
According to the leachate recycling treatment system provided by the invention, the steam generating device burns combustion gases such as natural gas and methane to generate heating steam, and the heating steam is conveyed to the heating fluid inlet of the evaporation device, the heating fluid inlet of the leachate heating device and the heating fluid inlet of the aerobic fermentation device, so that heat sources are provided for the evaporation device, the leachate heating device and the aerobic fermentation device. Leachate enters the leachate preheating device from a leachate preheating inlet, the heat source of the leachate preheating device is distilled water generated by an evaporation device, the leachate in the leachate preheating device is subjected to heat exchange by using the waste heat of the distilled water, the leachate is preheated to a certain temperature, and the distilled water is cooled and then enters the nanofiltration device for further treatment to form wastewater reaching the discharge standard and is discharged. The preheated percolate enters a percolate heating device and is heated by heating steam, then enters an oil-water residue separation device for separation, the separated grease is used as a biomass diesel raw material, the separated oil-water residue separation sewage enters an evaporation device, the oil-water residue separation sewage, the filter-pressing dehydration sewage, the tail gas condensate water and the nanofiltration concentrated water all enter the evaporation device through a sewage inlet, the water in the mixed liquid of the oil-water residue separation sewage, the filter-pressing dehydration sewage, the tail gas condensate water and the nanofiltration concentrated water is heated in the evaporation device to be distilled water, and impurities in the sewage become drying slurry. And solid residues separated by the dried slurry and the oil-water residue separation device enter a filter-pressing dehydration device for filter pressing, then enter an aerobic fermentation device to be mixed with a microbial inoculum, an adjusting auxiliary material and the like for aerobic fermentation (and drying) to generate an organic fertilizer or feed, wherein heat sources required by the fermentation and drying of the aerobic fermentation device are heating steam. The leachate recycling treatment system provided by the invention has no outward solid waste garbage, converts organic matters in the leachate into organic fertilizers or feeds to the greatest extent, improves the added-value products, is used for improving the soil or adjusting the feed protein, and improves the recycling utilization rate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a first structure of a leachate recycling treatment system provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a leachate recycling treatment system according to an embodiment of the present invention.
Detailed Description
The invention discloses a leachate recycling treatment system, which aims to improve the recycling utilization rate.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, an embodiment of the present invention provides a leachate recycling treatment system, which includes a leachate preheating device 1, a leachate heating device 4, an oil-water-residue separation device 8, an evaporation device 6, a filter-pressing dehydration device 22, an aerobic fermentation device 21, a nanofiltration device 19, and a steam generation device 2. The leachate preheating device 1 is provided with a leachate preheating inlet for the leachate c to enter and a leachate preheating outlet for the leachate c to flow out; the leachate heating device 4 is provided with a leachate heating inlet and a leachate heating outlet, and the leachate heating inlet is communicated with the leachate preheating outlet; the inlet of the oil-water residue separation device 8 is communicated with the percolate heating outlet, and the oil-water residue separation device 8 is also provided with a first sewage outlet for discharging oil-water residue separation sewage d, a grease outlet for discharging grease f and a solid residue outlet for discharging solid residue e; the evaporation device 6 is provided with a sewage inlet communicated with the first sewage outlet, a distilled water outlet for discharging distilled water and a slurry outlet for discharging dried slurry I; the filter-pressing dehydration device 22 is provided with a filter-pressing material inlet communicated with the slurry outlet and the solid slag outlet, a second sewage outlet for discharging filter-pressing dehydration sewage k and a filter cake outlet for discharging a filter cake p, and the second sewage outlet is communicated with the sewage inlet; the aerobic fermentation device 21 is provided with an aerobic fermentation inlet communicated with the filter cake outlet, a tail gas condensate outlet for discharging tail gas condensate i and an aerobic fermentation outlet for outputting organic fertilizer or feed j, and the tail gas condensate outlet is communicated with the sewage inlet; the nanofiltration device 19 is provided with a nanofiltration inlet, a nanofiltration sewage outlet and a standard wastewater discharge outlet, wherein the nanofiltration sewage outlet is used for discharging nanofiltration concentrated water r; the heating steam b output by the steam generating device 2 is delivered to the heating fluid inlet of the evaporating device 6, the heating fluid inlet of the percolate heating device 4 and the heating fluid inlet of the aerobic fermentation device 21.
In the leachate recycling treatment system provided by the embodiment of the invention, the steam generating device 2 burns combustion gas a such as natural gas and methane to generate heating steam b, and the heating steam b is conveyed to the heating fluid inlet of the evaporation device 6, the heating fluid inlet of the leachate heating device 4 and the heating fluid inlet of the aerobic fermentation device 21, so that heat sources are provided for the evaporation device 6, the leachate heating device 4 and the aerobic fermentation device 21. The leachate c enters the leachate preheating device 1 from a leachate preheating inlet, the heat source of the leachate preheating device 1 is distilled water o generated by the evaporation device 6, the leachate c in the leachate preheating device 1 is subjected to heat exchange by using the waste heat of the distilled water o, the leachate c is preheated to a certain temperature, the distilled water o is cooled and then enters the nanofiltration device 19 for further treatment, and wastewater h reaching the discharge standard is formed and discharged. The preheated leachate c enters a leachate heating device 4 and is heated by heating steam b, then enters an oil-water-residue separation device 8 for separation, separated grease f serves as a biomass diesel raw material g, separated oil-water-residue separated sewage d enters an evaporation device 6, the oil-water-residue separated sewage d, filter-pressing dewatered sewage k, tail gas condensate water i and nanofiltration concentrated water r all enter the evaporation device 6 through a sewage inlet, water in a mixed liquid of the oil-water-residue separated sewage d, the filter-pressing dewatered sewage k, the tail gas condensate water i and the nanofiltration concentrated water r is heated in the evaporation device 6 to become distilled water o, and impurities in the sewage become drying slurry l. And (3) feeding the dried slurry l and solid residues e separated by the oil-water residue separation device 8 into a filter-pressing dehydration device 22 for filter pressing, then feeding the filter-pressing dehydration device into an aerobic fermentation device 21, mixing the filter-pressing dehydration device with a microbial inoculum, an adjusting auxiliary material and the like, and performing aerobic fermentation (and drying) to generate an organic fertilizer or feed j, wherein a heat source required by the fermentation and drying of the aerobic fermentation device 21 is heating steam b. The leachate recycling treatment system provided by the embodiment of the invention has no discharged solid waste garbage, converts organic matters in the leachate c into organic fertilizers or feed j to the maximum extent, improves the added-value products, is used for improving the soil or adjusting the feed protein, and improves the recycling utilization rate.
And the residual heat of the distilled water o is utilized to carry out heat exchange on the leachate c in the leachate preheating device 1, the leachate c is preheated to a certain temperature, the energy utilization rate is improved, the distilled water o enters the nanofiltration device 19 for further treatment after being cooled, and the wastewater h up to the standard is formed and discharged. The wastewater h is prepared by distillation, the impurity content is low, and the organic matters and macromolecular inorganic salts in the wastewater h are further reduced by treating the wastewater h by a nanofiltration device 19(NF) before discharge, so that the discharge standard reaching rate is high. In addition, the heating steam b generated by the steam generating device 2 is used as a heat source, so that the investment of the leachate recycling treatment system is low, the occupied area is small, and the operation cost is low.
Preferably, the percolate c enters the percolate heating device 4 and is heated by the heating steam b, and then is preferably heated to 40-70 ℃ so as to increase the molecular granularity of the grease, reduce the viscosity of the grease and facilitate the separation of the grease.
Further, the evaporation device 6 is preferably an MVR (Mechanical Vapor Recompression) evaporator. Other heat exchangers can also be used as the evaporator device 6, which are not described in detail here and are all within the scope of protection.
The leachate recycling treatment system provided by the embodiment of the invention further comprises a compressor 15, wherein an inlet of the compressor 15 is communicated with the low-temperature steam port of the evaporation device 6, and an outlet of the compressor 15 is communicated with the high-temperature steam port of the evaporation device 6.
The water in the sewage (oil-water residue separation sewage d, filter-pressing dehydration sewage k, tail gas condensate i and nanofiltration concentrated water r) is changed into low-temperature steam n under the heating condition of heating steam b, the low-temperature steam n enters a compressor 15 for compression and pressurization, the high-temperature steam m after pressurization and temperature rise heats the sewage in the evaporation device 6 to continuously generate the low-temperature steam n, and the high-temperature steam m after pressurization and temperature rise releases heat and then is changed into distilled water o. By the circulation, the water in the sewage is evaporated to be distilled water, and the impurities in the sewage are changed to be dried slurry. Through the arrangement, energy is saved as far as possible.
The leachate recycling treatment system provided by the embodiment of the invention further comprises an acid-base washing assembly arranged between the low-temperature steam port of the evaporation device 6 and the inlet of the compressor 15. Acid-base washing is carried out on the low-temperature steam n through the acid-base washing assembly, so that corrosion of the low-temperature steam n to the compressor 15 is reduced, and the service life of the compressor 15 is prolonged.
It can be understood that the concentrated liquid s in the evaporation device 6 is circularly sprayed by the first circulating pump 3, so that the evaporation speed is improved.
In this embodiment, the acid-base washing component includes a defoaming device 7, an acid washing device, and an 11-stage alkaline washing device 18: the inlet of the defoaming device 7 is communicated with the low-temperature steam port of the evaporation device 6; the inlet of the acid washing device 11 is communicated with the outlet of the defoaming device 7; the inlet of the alkali washing device 18 is communicated with the outlet of the acid washing device 11, and the outlet of the alkali washing device 18 is communicated with the inlet of the compressor 15. The low-temperature steam n enters a compressor 15 after being processed by a defoaming device 7, an acid washing device 11 and an alkali washing device 18.
It will be appreciated that the acid scrubber 11 is circulated by the second circulation pump 10 with the scrubbing steam and the alkaline scrubber 18 is circulated by the third circulation pump 17 with the scrubbing steam.
The leachate recycling treatment system provided by the embodiment of the invention further comprises a homogenizing tank 13 which is provided with a first inlet communicated with the solid slag discharge port, a second inlet communicated with the slurry outlet and a solid slag slurry outlet communicated with the filter pressing material inlet.
The solid slag e separated by the oil-water-slag separating device 8 enters a homogenizing tank 13, the dried slurry l generated by the evaporating device 6 is sent to the homogenizing tank 13, and the dried slurry l and the solid slag e are mixed, tempered and then sent to a filter-pressing dehydration device 22.
Preferably, the dried slurry l discharged from the slurry outlet of the evaporator 6 is sent to the homogenizing tank 13 by the first power pump 14, and the solid slag slurry q formed by mixing and tempering the dried slurry l and the solid slag e is sent to the pressure equalizing, filtering and dehydrating device 22 by the second power pump 16 to generate the filter cake p.
The leachate recycling treatment system provided by the embodiment of the invention further comprises an oil storage tank 20, an inlet of the oil storage tank 20 is communicated with the grease discharge port, and an outlet of the oil storage tank 20 is used for discharging the biomass diesel raw material g.
And the grease f is collected and then sent to an oil storage tank 20 through a third power pump 12 to be stored, and the grease f is sold as a biomass diesel raw material g after being stored to a certain amount.
The leachate recycling treatment system provided by the embodiment of the invention further comprises a tempering tank 9, wherein the tempering tank 9 is provided with a tempering inlet communicated with the first sewage outlet, the second sewage outlet and the tail gas condensate outlet and a tempering outlet communicated with the sewage inlet. The sewage enters a tempering tank 9 for tempering before entering the evaporation device 6.
The embodiment of the invention also provides a leachate recycling treatment method, which comprises the following steps:
s1: heating the percolate c;
preferably, the leachate c is heated to 40 to 70 ℃ so as to increase the molecular particle size of the grease, reduce the viscosity of the grease and facilitate the separation of the grease.
S2: and (3) carrying out oil-water residue separation on the heated percolate, taking the separated grease f as a biomass diesel raw material g, evaporating the separated oil-water residue separation sewage d to generate dried slurry l, and carrying out aerobic fermentation on the dried slurry l and the separated solid residue e to generate an organic fertilizer or feed j.
The leachate recycling treatment method provided by the embodiment of the invention has no discharged solid waste garbage, converts organic matters in the leachate c into organic fertilizers or feed j to the maximum extent, improves the added-value products, is used for improving the soil or adjusting the feed protein, and improves the recycling utilization rate.
Further, step S1 is preceded by the step of preheating the leachate c, and the preheating heat source is distilled water generated by evaporating the oil-water residue separation wastewater d. Through the arrangement, the heat source utilization rate is improved. In this embodiment, the evaporated oil-water-residue separated wastewater d is treated by an MVR evaporator (evaporation apparatus 6).
In order to improve the fermentation efficiency, in step S2, before the dried slurry l and the solid residue e are subjected to aerobic fermentation, the dried slurry l and the solid residue e are subjected to filter pressing and dehydration.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A leachate recycling treatment system, comprising:
the leachate preheating device (1), the leachate preheating device (1) is provided with a leachate preheating inlet for the leachate (c) to enter and a leachate preheating outlet for the leachate (c) to flow out;
the leachate heating device (4), the leachate heating device (4) is provided with a leachate heating inlet and a leachate heating outlet, and the leachate heating inlet is communicated with the leachate preheating outlet;
the inlet of the oil-water-slag separating device (8) is communicated with the heating outlet of the percolate, and the oil-water-slag separating device (8) is also provided with a first sewage outlet for discharging oil-water-slag separated sewage (d), a grease outlet for discharging grease (f) and a solid slag outlet for discharging solid slag (e);
an evaporation device (6), wherein the evaporation device (6) is provided with a sewage inlet communicated with the first sewage outlet, a distilled water outlet for discharging distilled water (o) and a slurry outlet for discharging dried slurry (l);
a filter-pressing dehydration device (22), wherein the filter-pressing dehydration device (22) is provided with a filter-pressing material inlet communicated with the slurry outlet and the solid slag outlet, a second sewage outlet for discharging filter-pressing dehydration sewage (k) and a filter cake outlet for discharging a filter cake (p), and the second sewage outlet is communicated with the sewage inlet;
the aerobic fermentation device (21) is provided with an aerobic fermentation inlet communicated with the filter cake outlet, a tail gas condensed water outlet for discharging tail gas condensed water (i) and an aerobic fermentation outlet for outputting organic fertilizer or feed (j), and the tail gas condensed water outlet is communicated with the sewage inlet;
a nanofiltration device (19), wherein the nanofiltration device (19) is provided with a nanofiltration inlet, a nanofiltration sewage outlet and a standard wastewater discharge outlet, the nanofiltration sewage outlet is used for discharging nanofiltration concentrated water (r), the nanofiltration inlet is communicated with the distilled water outlet, and the nanofiltration sewage outlet is communicated with the sewage inlet;
the heating steam (b) output by the steam generating device (2) is conveyed to a heating fluid inlet of the evaporating device (6), a heating fluid inlet of the percolate heating device (4) and a heating fluid inlet of the aerobic fermentation device (21).
2. The leachate recycling treatment system as set forth in claim 1, further comprising a compressor (15), wherein an inlet of said compressor (15) is in communication with a low temperature steam port of said evaporation apparatus (6), and an outlet of said compressor (15) is in communication with a high temperature steam port of said evaporation apparatus (6).
3. The leachate recycling treatment system of claim 2, further comprising an acid-base washing assembly disposed between the low temperature steam port of the evaporation apparatus (6) and the inlet of the compressor (15).
4. The leachate recycling system of claim 3, wherein said acid-base washing module comprises:
the inlet of the defoaming device (7) is communicated with the low-temperature steam port of the evaporation device (6);
an acid washing device (11), wherein the inlet of the acid washing device (11) is communicated with the outlet of the defoaming device (7);
the inlet of the alkali washing device (18) is communicated with the outlet of the acid washing device (11), and the outlet of the alkali washing device (18) is communicated with the inlet of the compressor (15).
5. The leachate recycling system as set forth in claim 1, further comprising a homogenizing tank (13) having a first inlet communicating with the solid slag discharge port, a second inlet communicating with the slurry outlet, and a solid slag slurry outlet communicating with the press filtrate inlet.
6. The leachate recycling system as set forth in claim 1, further comprising an oil storage tank (20), wherein an inlet of said oil storage tank (20) is connected to said grease discharge port, and an outlet of said oil storage tank (20) is used for discharging the biodiesel raw material (g).
7. The leachate recycling system as set forth in any of claims 1 to 6, further comprising a conditioning tank (9), wherein said conditioning tank (9) has a conditioning inlet communicating with said first wastewater outlet, said second wastewater outlet and said off-gas condensate outlet and a conditioning outlet communicating with said wastewater inlet.
8. A leachate recycling treatment method is characterized by comprising the following steps:
1) heating the percolate (c);
2) and (3) carrying out oil-water-residue separation on the heated percolate, taking the separated grease (f) as a biomass diesel raw material (g), evaporating the separated oil-water-residue separated sewage (d) to generate dried slurry (l), and carrying out aerobic fermentation on the dried slurry (l) and the separated solid residue (e) to generate an organic fertilizer or feed (j).
9. The leachate recycling method as set forth in claim 8, wherein step 1) is preceded by the step of preheating the leachate (c), and the preheating heat source is the distilled water (o) generated by evaporating the oil-water-slag separated wastewater (d).
10. The method for recycling leachate of claim 8, wherein in step 2), the dried slurry (l) and the solid residue (e) are subjected to filter pressing dehydration before aerobic fermentation.
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