CN105880279A - Efficient soil repairing method based on energy plants - Google Patents
Efficient soil repairing method based on energy plants Download PDFInfo
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- CN105880279A CN105880279A CN201610223707.8A CN201610223707A CN105880279A CN 105880279 A CN105880279 A CN 105880279A CN 201610223707 A CN201610223707 A CN 201610223707A CN 105880279 A CN105880279 A CN 105880279A
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- 239000002689 soil Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000000855 fermentation Methods 0.000 claims abstract description 67
- 230000004151 fermentation Effects 0.000 claims abstract description 64
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 28
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003610 charcoal Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000446 fuel Substances 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims abstract description 5
- 241000196324 Embryophyta Species 0.000 claims description 26
- 238000005067 remediation Methods 0.000 claims description 17
- 239000000945 filler Substances 0.000 claims description 15
- 244000025254 Cannabis sativa Species 0.000 claims description 14
- 229920002678 cellulose Polymers 0.000 claims description 10
- 239000001913 cellulose Substances 0.000 claims description 10
- 238000001179 sorption measurement Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 5
- 239000010902 straw Substances 0.000 claims description 5
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- 238000007037 hydroformylation reaction Methods 0.000 claims description 4
- 229920002994 synthetic fiber Polymers 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 241001520808 Panicum virgatum Species 0.000 claims description 2
- 241000209046 Pennisetum Species 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000029087 digestion Effects 0.000 abstract 1
- 239000002002 slurry Substances 0.000 description 5
- 239000003225 biodiesel Substances 0.000 description 4
- 229910052793 cadmium Inorganic materials 0.000 description 4
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 4
- 238000009396 hybridization Methods 0.000 description 4
- 210000004243 sweat Anatomy 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 241000233866 Fungi Species 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 235000013339 cereals Nutrition 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 2
- 231100000704 bioconcentration Toxicity 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 150000004676 glycans Chemical class 0.000 description 2
- 238000011081 inoculation Methods 0.000 description 2
- 239000002054 inoculum Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 229920001282 polysaccharide Polymers 0.000 description 2
- 239000005017 polysaccharide Substances 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 108010022579 ATP dependent 26S protease Proteins 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007952 growth promoter Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 102000039446 nucleic acids Human genes 0.000 description 1
- 108020004707 nucleic acids Proteins 0.000 description 1
- 150000007523 nucleic acids Chemical class 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
-
- 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
- Y02W30/00—Technologies for solid waste management
- Y02W30/20—Waste processing or separation
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mycology (AREA)
- Thermal Sciences (AREA)
- Botany (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Soil Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses an efficient soil repairing method based on energy plants. The method comprises the following steps that firstly, energy plants are planted on the land polluted by heavy metal; secondly, the energy plants are crushed till the grain diameter ranges from 1 cm to 2 cm, anaerobic dry fermentation is conducted, methane is recycled, and percolate enters a collecting pond arranged at the lower portion of a dry fermentation device; thirdly, fermentation residues are subjected to solid-liquid separation dewatering and dried, and formed fuel is manufactured; fourthly, residual liquid and the percolate are collected and mixed, anaerobic digestion treatment is conducted through an up-flow pipe type anaerobic reactor loaded with soft fiber filling, and methane is obtained and recycled; and fifthly, charcoal is put into effluent fermentation liquor, and the heavy metal is adsorbed. The anaerobic dry fermentation is conducted on the energy plants rich in heavy metal, and due to the fact that the amount of water used for dry fermentation is small, the water generated in the fermentation process and the water content in the fermentation residues are very little, and compared with other energy utilization manners, subsequent treatment input has more economical advantages.
Description
Technical field
The present invention relates to belong to biotechnology energy field, be specifically related to a kind of efficient soil remediation method based on energy-source plant.
Background technology
Along with growing continuously and fast of China's industrial or agricultural, heavy metal pollution of soil is on the rise, and threatens grain-production and the mankind are good for
Health, it has also become one of the most noticeable environmental problem.National environmental protection portion and Ministry of Land and Resources combined in April, 2014 to be sent out
Cloth " whole nation Soil Pollution Investigation publication ", soil total some position exceeding standard rate in the publication display whole nation is 16.1%, with cadmium (Cd),
Hydrargyrum (Hg), arsenic (As), copper (Cu), lead (Pb), chromium (Cr), zinc (Zn), nickel (Ni) are that the inorganic pollution type of representative accounts for and all exceeds standard
The 82.8% of point position.Present in polluted soil, high concentration heavy metal can endanger the growth promoter of plant, cause grain drop in production and
Quality reduces；Change biotic population in soil, affect the 26S Proteasome Structure and Function of its ecosystem, cause the degeneration of soil productivity.
Phytoremediation has low cost, can complete in situ and the advantage such as non-secondary pollution, just become the mainstream technology of soil remediation.
Generally utilize super enriching plant to carry out land remediation at present, but the recycling of super enriching plant is worth low, the plant grown up to
General employing is removed or burning disposal, and land resource fails to be fully utilized.And utilize energy-source plant to carry out soil remediation,
Clean energy resource can also be obtained while solving heavy metal pollution, have environment and economical effects concurrently, the research of related fields
Increase the most year by year.
At present, utilize what energy-source plant carried out soil remediation mainly to have the disclosed 200810046469.3 " energy of Xu Heng, Ji Lingyun et al.
Source plant and the method for mushroom fungus renovation of heavy metal polluted soil with combined " utilize energy-source plant-mushroom fungus joint implant to carry out heavy metal-polluted soil
Repairing, the energy-source plant after maturation produces for liquid fuel (biodiesel/alcohol fuel), and mushroom fungus and other plant residue are used
In biogas production.The method only accounts for utilizing chemical method that the biogas slurry that may contain high concentration heavy metal is carried out precipitation process,
But do not propose any processing method to deriving from the biodiesel being also derived from enriching plant, and the weight contained in this liquid fuel
Metal then may produce secondary pollution to coming back in environment in utilization in the future.Jiang Lijuan, Yi Xinyu et al. are disclosed
201410179813.1 " a kind of method utilizing energy-source plant configuration mode restoration of soil polluted by heavy metal " proposes will be containing a huge sum of money
The biodiesel belonged to carries out HDM process, eliminates with this and follow-up utilizes risk.But it is to increase this step to significantly improve
Utilize cost, reduce the price advantage of biodiesel.
Summary of the invention
It is an object of the invention to provide a kind of efficient soil remediation method based on energy-source plant, overcome the defect that prior art is not enough.
The present invention is achieved by the following technical programs:
A kind of efficient soil remediation method based on energy-source plant, comprises the following steps:
(1) on by the soil of heavy metal pollution, plant energy grass, the energy grass planted is cradled；
(2) energy grass after cradling is crushed to particle diameter 1cm～2cm, carries out anaerobic dry fermentation, and dry fermentation concentration is 18%-20%,
Fermentation temperature is 37 DEG C；Producing methane, fermentation liquid and fermentation residue after dry fermentation, by described methane recovery, described percolate enters
Enter the collecting pit that dry fermentation device bottom is arranged；
(3) fermentation residue described in step (2) carried out solid-liquid separation dehydration and is dried, making shaped fuel；
(4) residual liquid that fermentation residue in step (3) carries out solid-liquid separation dehydration is received with the percolate of generation in step (2)
Collection mixing, carries out anaerobic fermentation process by carrying the up-flow tubular type anaerobic reactor of soft cellulose filler, obtains methane and reclaim；
(5) the water outlet fermentation liquid after anaerobic fermentation processes in step (4) puts into charcoal wherein heavy metal is carried out at absorption
Reason, carries out the charcoal after adsorption treatment concentrating landfill disposal.
The present invention carries out anaerobic dry fermentation process to the energy grass being enriched heavy metal, owing to dry fermentation water consumption is few, in sweat
In the moisture produced and fermentation residue, water content is all little, and subsequent treatment puts into and has more economy compared to other energy utilization patterns
Advantage.
Preferably, described in step (1), energy grass is hybrid pennisetum or switchgrass.
Preferably, the distance between rows and hills of planting of energy grass described in step (1) is 120 × 60cm.
Preferably, energy grass described in step (1) cradles frequency is 2 times/year.
Preferably, shaped fuel described in step (3) carries out melt process recovery heavy metal through the lime-ash that burning produces.
Preferably, soft cellulose filler described in step (4) is hydroformylation fibre synthetic fibre, and filler bundle is between the upper and lower away from for 60-80mm, its diameter
It is 120～130mm.Utilize the up-flow tubular type anaerobic reactor being equipped with soft cellulose filler that residual solution and percolate are carried out secondary
Fermentation process can not only carry out sufficient energy recovery utilization to raw material, also helps the heavy metal concentration reduced in fermentation liquid.
Further, the reaction condition that anaerobic fermentation described in step (4) processes is 37 DEG C.
Preferably, described in step (5), charcoal is rice straw charcoal.Utilize charcoal to the huge sum of money in anaerobic treatment water outlet
Belonging to and carry out absorption replacement chemical precipitation, more environmentally friendly, the fermentation liquid being disposed will not be right due to the addition of excess precipitant
Environment produces secondary pollution.
The invention has the beneficial effects as follows:
(1) energy grass being enriched heavy metal is carried out anaerobic dry fermentation process, owing to dry fermentation water consumption is few, in sweat
In the moisture produced and fermentation residue, water content is all little, and subsequent treatment puts into and has more economy compared to other energy utilization patterns
Advantage.
(2) utilize the up-flow tubular type anaerobic reactor being equipped with soft cellulose filler that residual solution and percolate are carried out at ferment in second time
Reason can not only carry out sufficient energy recovery utilization to raw material, simultaneously because on filler in attached biological film, outside degerming body
Main ingredient is the extracellular polymeric (EPS) secreted by it, the main component of this high molecular polymer be polysaccharide,
Protein, nucleic acid and lipid etc., a large amount of anionic groups on its surface show strong affinity to dissimilar metal ion.
Owing to extracellular polymeric contains electronegative functional group, such as the Suo Ji functional group of polysaccharide, protein etc., therefore biomembrane can
To be interacted with heavy metal by electronegative cooperation base such that it is able to gradually Adsorption of Heavy Metal Ions.Therefore, be conducive to
Reduce the heavy metal concentration in fermentation liquid.
(3) utilize charcoal that the heavy metal in anaerobic treatment water outlet carries out absorption and substitute chemical precipitation, more environmentally friendly, place
Manage complete fermentation liquid and due to the addition of excess precipitant, environment will not be produced secondary pollution.And charcoal derives from discarded life
Raw material of substance (straw), low cost, is also a kind of recycling mode to organic waste.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of efficient soil remediation method based on energy-source plant of the present invention.
Detailed description of the invention:
The following is and the present invention is further illustrated rather than limitation of the present invention.
Except special instruction, equipment and reagent that the present invention uses are the art routine commercial products.
Embodiment 1
Flow chart as shown in Figure 1: planted miscellaneous in the soil of 2.1-3mg/Kg by heavy metal cadmium slight pollution, i.e. cadmium concentration
Handing over Herba penniseti, distance between rows and hills of planting is 120 × 60cm, is collected after 6 months, and within 1 year, cradling frequency is 2 times.The hybridization collected
In Herba penniseti, cadmium concentration is 0.56mg/Kg, and bio-concentration factor is 0.19.Fresh hybridization Herba penniseti TS is 28%, is crushed to grain
Footpath 1cm-2cm.Dry fermentation concentration controls at 18%-20%, and fermentation temperature is 37 DEG C；The inoculum that will warm up 37 DEG C passes through
Spray mode is inoculated；The a small amount of percolate produced in sweat enters the collecting pit of installation for fermenting bottom and heats, backflow,
It is sprayed on dry fermentation materials, thus increases the matter heat transfer of storeroom, reclaim methane simultaneously.Anaerobic dry fermentation need to be inoculated on a small quantity
Fermentation concentration is only 400-556g from the biogas slurry consumption of 28% regulation to the fresh Herba penniseti of 18%-20%, 1Kg by liquid, and utilizes wet
Formula fermentation process, same quality Herba penniseti is in terms of fermentation concentration 8%, and the amount of required addition inoculation liquid and water is 2500g.Fermentation
Residue passes through solid-liquid separation, and the Cd content in biogas slurry is 0.016mg/L, and in biogas residue, Cd content is 0.59mg/KgTS.This solid
Shaped fuel is made in partially dried pelletize, and liquid portion mixes with fermentation percolate, and regulates acid-base value to after 7.0-7.3, pumps into
The up-flow tubular type anaerobic reactor carrying soft cellulose filler carries out anaerobic fermentation, a diameter of 150mm of tubular reactor, high
900mm, blade diameter length ratio is 1:6, and cumulative volume is 16L；Soft cellulose filler is hydroformylation fibre synthetic fibre, and a diameter of 130mm, on filler
Lower spacing is 80mm, by intermittently starting inside reactor circulating pump so that feed liquid is sufficiently mixed, improves mass-transfer efficiency, with
Shi Huishou methane.This part water outlet adds excess straw biological charcoal Adsorption of Heavy Metal Ions, absorbs complete charcoal and collect
Middle landfill disposal.By biomembrane and charcoal Joint adsorption, in final outflow water, Cd concentration is less than 0.01mg/L, meets
GB18918 2002 urban wastewater treatment firm pollutant emission standard.The burned rear ash produced of shaped fuel that fermentation residue is made
Slag is under the situation of high temperature 1400 DEG C, and by melted, heavy metal obtains solidification and reclaims.
Embodiment 2
Flow chart as shown in Figure 1: planted miscellaneous in the soil of 88-95mg/Kg by heavy metal lead slight pollution, i.e. lead concentration
Handing over Herba penniseti, distance between rows and hills of planting is 120 × 60cm, is collected after 6 months, and within 1 year, cradling frequency is 2 times.The hybridization collected
In Herba penniseti, lead concentration is 4.3mg/Kg, and bio-concentration factor is 0.045.Fresh hybridization Herba penniseti TS is 28%, is crushed to grain
Footpath 1cm-2cm.Dry fermentation concentration controls at 18%-20%, and fermentation temperature is 37 DEG C；The inoculum that will warm up 37 DEG C passes through
Spray mode is inoculated；The a small amount of percolate produced in sweat enters the collecting pit of installation for fermenting bottom and heats, backflow,
It is sprayed on dry fermentation materials, thus increases the matter heat transfer of storeroom, reclaim methane simultaneously.Anaerobic dry fermentation need to be inoculated on a small quantity
Fermentation concentration is only 400-556g from the biogas slurry consumption of 28% regulation to the fresh Herba penniseti of 18%-20%, 1Kg by liquid, and utilizes wet
Formula fermentation process, same quality Herba penniseti is in terms of fermentation concentration 8%, and the amount of required addition inoculation liquid and water is 2500g.Fermentation
Residue passes through solid-liquid separation, and the Pb content in biogas slurry is 0.12mg/L, and in biogas residue, Pb content is 4.55mg/KgTS.This solid
Shaped fuel is made in partially dried pelletize, and liquid portion mixes with fermentation percolate, and regulates acid-base value to after 7.0-7.3, pumps into
The up-flow tubular type anaerobic reactor carrying soft cellulose filler carries out anaerobic fermentation, a diameter of 150mm of tubular reactor, high
900mm, blade diameter length ratio is 1:6, and cumulative volume is 16L；Soft cellulose filler is hydroformylation fibre synthetic fibre, and a diameter of 130mm, on filler
Lower spacing is 80mm, by intermittently starting inside reactor circulating pump so that feed liquid is sufficiently mixed, improves mass-transfer efficiency, with
Shi Huishou methane.This part water outlet adds excess straw biological charcoal Adsorption of Heavy Metal Ions, absorbs complete charcoal and collect
Middle landfill disposal.By biomembrane and charcoal Joint adsorption, in final outflow water, Pb concentration is less than 0.1mg/L, meets
GB18918 2002 urban wastewater treatment firm pollutant emission standard.The burned rear ash produced of shaped fuel that fermentation residue is made
Slag is under the situation of high temperature 1400 DEG C, and by melted, heavy metal obtains solidification and reclaims.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and this embodiment also is not used to limit the special of the present invention
Profit scope, all equivalences done without departing from the present invention are implemented or change, are intended to be limited solely by the scope of patent protection of this case.
Claims (8)
1. an efficient soil remediation method based on energy-source plant, it is characterised in that comprise the following steps:
(1) on by the soil of heavy metal pollution, plant energy grass, the energy grass planted is cradled；
(2) energy grass after cradling is crushed to particle diameter 1cm～2cm, carries out anaerobic dry fermentation, and dry fermentation concentration is 18%-20%,
Fermentation temperature is 37 DEG C；Producing methane, fermentation liquid and fermentation residue after dry fermentation, by described methane recovery, described percolate enters
Enter the collecting pit that dry fermentation device bottom is arranged；
(3) fermentation residue described in step (2) carried out solid-liquid separation dehydration and is dried, making shaped fuel；
(4) residual liquid that fermentation residue in step (3) carries out solid-liquid separation dehydration is received with the percolate of generation in step (2)
Collection mixing, carries out anaerobic fermentation process by carrying the up-flow tubular type anaerobic reactor of soft cellulose filler, obtains methane and reclaim；
(5) the water outlet fermentation liquid after anaerobic fermentation processes in step (4) puts into charcoal heavy metal and carries out adsorption treatment,
Carry out the charcoal after adsorption treatment concentrating landfill disposal.
Efficient soil remediation method based on energy-source plant the most according to claim 1, it is characterised in that institute in step (1)
Stating energy grass is hybrid pennisetum or switchgrass.
Efficient soil remediation method based on energy-source plant the most according to claim 1 and 2, it is characterised in that step (1)
Described in energy grass spacing of planting be 120 × 60cm.
Efficient soil remediation method based on energy-source plant the most according to claim 1 and 2, it is characterised in that step (1)
Described in energy grass to cradle frequency be 2 times/year.
Efficient soil remediation method based on energy-source plant the most according to claim 1 and 2, it is characterised in that step (3)
Described in shaped fuel through burning produce lime-ash carry out melt process reclaim heavy metal.
Efficient soil remediation method based on energy-source plant the most according to claim 1 and 2, it is characterised in that step (4)
Described in soft cellulose filler be hydroformylation fibre synthetic fibre, filler bundle is between the upper and lower away from for 60-80mm, and they are a diameter of 120～130mm years old.
Efficient soil remediation method based on energy-source plant the most according to claim 6, it is characterised in that institute in step (4)
The reaction condition stating anaerobic fermentation process is 37 DEG C.
Efficient soil remediation method based on energy-source plant the most according to claim 1 and 2, it is characterised in that step (5)
Described in charcoal be rice straw charcoal.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106914478A (en) * | 2017-04-06 | 2017-07-04 | 中华全国供销合作总社天津再生资源研究所 | The energy-source plant restorative procedure and the modifying agent for the method for heavy-metal contaminated soil |
| CN111974791A (en) * | 2020-07-08 | 2020-11-24 | 中国科学院广州能源研究所 | Ecological energy farm remediation method for multi-scene application of ionic rare earth mining area soil |
| CN115055514A (en) * | 2022-01-14 | 2022-09-16 | 江苏省农业科学院 | Method for preparing carbon-reducing and carbon-negative product by taking agricultural and forestry waste as raw material |
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| JP2004121992A (en) * | 2002-10-02 | 2004-04-22 | Kurimoto Ltd | System for recycling polluted soil |
| CN104475433A (en) * | 2014-11-19 | 2015-04-01 | 湖南广义科技有限公司 | Harmless control and resource recovery method of lands polluted by heavy metals |
| CN104726322A (en) * | 2015-03-03 | 2015-06-24 | 福建农林大学 | Energy grass liquid-solid combined biogas fermenting system |
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