CN106862261A - Chromium-polluted soil humic acid green in-situ renovation technique - Google Patents
Chromium-polluted soil humic acid green in-situ renovation technique Download PDFInfo
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- CN106862261A CN106862261A CN201710171652.5A CN201710171652A CN106862261A CN 106862261 A CN106862261 A CN 106862261A CN 201710171652 A CN201710171652 A CN 201710171652A CN 106862261 A CN106862261 A CN 106862261A
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- 239000002689 soil Substances 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 31
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 239000004021 humic acid Substances 0.000 title claims abstract description 29
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 21
- 238000009418 renovation Methods 0.000 title claims abstract description 13
- 239000011651 chromium Substances 0.000 claims abstract description 80
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 46
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 230000009467 reduction Effects 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 9
- 150000002500 ions Chemical class 0.000 claims abstract description 8
- 239000007921 spray Substances 0.000 claims abstract description 8
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 7
- 230000005012 migration Effects 0.000 claims abstract description 7
- 238000013508 migration Methods 0.000 claims abstract description 7
- 230000000903 blocking effect Effects 0.000 claims abstract description 6
- 238000005469 granulation Methods 0.000 claims abstract description 6
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- 239000007788 liquid Substances 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 6
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- 238000000197 pyrolysis Methods 0.000 claims description 13
- 239000002028 Biomass Substances 0.000 claims description 12
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 9
- 229910052708 sodium Inorganic materials 0.000 claims description 9
- 239000011734 sodium Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 4
- 229910052700 potassium Inorganic materials 0.000 claims description 4
- 239000011591 potassium Substances 0.000 claims description 4
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 4
- 230000007480 spreading Effects 0.000 claims description 4
- 238000003892 spreading Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- MQLVWQSVRZVNIP-UHFFFAOYSA-L ferrous ammonium sulfate hexahydrate Chemical compound [NH4+].[NH4+].O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O MQLVWQSVRZVNIP-UHFFFAOYSA-L 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 claims description 2
- 235000010262 sodium metabisulphite Nutrition 0.000 claims description 2
- 235000010265 sodium sulphite Nutrition 0.000 claims description 2
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 2
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 claims description 2
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims 1
- 230000032683 aging Effects 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 229940079827 sodium hydrogen sulfite Drugs 0.000 claims 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 6
- 238000006722 reduction reaction Methods 0.000 description 16
- 239000003921 oil Substances 0.000 description 11
- 241000196324 Embryophyta Species 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 8
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- 238000012360 testing method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000536 complexating effect Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
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- 238000005485 electric heating Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
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- 239000008187 granular material Substances 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000005067 remediation Methods 0.000 description 2
- 238000003900 soil pollution Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
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- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000012075 bio-oil Substances 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 235000021393 food security Nutrition 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229940079826 hydrogen sulfite Drugs 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 229940068041 phytic acid Drugs 0.000 description 1
- 235000002949 phytic acid Nutrition 0.000 description 1
- 239000000467 phytic acid Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
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- 238000000746 purification Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
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- 238000004904 shortening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Chromium-polluted soil humic acid green in-situ renovation technique, the first step, when chromium-polluted soil is crushed, addition agent chromium is than 5 20:1 humic-acid-type substances in-situ reducing；Second step, after the chromium-polluted soil less than 3mm is aged more than 1 hour, according to the content of 6-valence Cr ions for detecting, according to agent chromium than 10 30:1 sprays into strong reductant solution, is well mixed and forces reduction；3rd step, chromium-polluted soil sprays into agent soil ratio 15 after reduction:The 100 pellet granulations of liquid humic acid, Cr VI oozes out and migration, the permanent reduction of realization and fixed, recovery soil plantation function in parcel blocking particle.
Description
1. technical field
The chromium-polluted soil humic acid green in-situ renovation technique that the present invention is provided, is related to the purification treatment of contaminated soil,
More particularly to repaired by chromium-polluted soil.
2. background technology
Soil pollution can constitute a serious threat to ecological environment, food security and health, heavy metal pollution in recent years
Soil pollution is especially prominent caused by thing, wherein being even more the most important thing by the soil of pollution of chromium.
There are nearly 70 main chromium slag contaminated sites in China, adds the enterprises such as a large amount of plating and leather, causes serious soil Cr
Pollution, threatens or endangers underground water and drinking water source.In addition, in MSW (sludge, flyash, rubbish) and phosphate fertilizer
Containing chromium, because the solid waste to these with certain fertility implements agricultural reuse so that the chromium content in soil is high
In background value, one of the source as pollution of chromium.
The improvement recovery technique in pollution of chromium place is the emphasis and difficult point of environmental protection Technological research both at home and abroad.Chromium is in nature master
To exist with (III) two kind of stabilization valence state of Cr VI Cr (VI) and trivalent chromium Cr.Trivalent chromium is main with Cr3+Form is present, activity
Low, small toxicity；Cr VI is main with (HCrO4)-(CrO4)2-Two kinds of forms are present, soluble in water, and activity is high, strong toxicity.
The recovery technique of current chromium-polluted soil mainly has two classes：One is the existing forms for changing chromium in soil, by six
Valency chromium is reduced to trivalent chromium, reduces its transfer ability and bioavailability in the environment, so as to reduce the danger of chromium pollutant
Evil；Two is that chromium is thoroughly removed from contaminated soil.The soil restoring technology of pollution of chromium mainly has biological restoration, physics
Repairing method, physical chemistry repairing method, chemical restoration.
Biological restoration includes phytoremediation and microorganism remediation.Microorganism remediation is using the indigenous micro- life in native soil
Thing passes through the high-effective microorganism tamed to pollution environment supplement.Under the operating condition of optimization, by bioreduction, will
Hexavalent chrome reduction is trivalent chromium, so as to repair contaminated soil.Biological prosthetic repairing effect is good, low cost, secondary pollution are small, but
Repairing efficiency is very long.
Physical restoration is the classical soil Cr pollution control measure of comparing, is mainly digged including soil moved in improve the original, soil removal and replacement and deep ploughing
Deng measure, digged by soil moved in improve the original, soil removal and replacement and deep ploughing is mixed with dirty soil, reduces the content of Chromium in Soil, reduces chromium to soil, plant
The murder by poisoning that system is produced.Physical restoration has the advantages that method is simple, the cost time is few, thorough stabilization, but implements quantities
Greatly, investment cost is high, contaminated soil is still present, and destroys soil structures, causes soil fertility to decline, will also be to changing out
Dirty soil stacked or processed.But it is still a kind of effective side for the with serious pollution soil soil moved in improve the original of small area or soil removal and replacement
Method.
The physical chemistry repairing method method such as including electro reclamation, electric heating reparation, Soil leaching.Electro reclamation is in soil
Insertion yin, yang electrode, applies direct current, under electric field action, makes Cr6+Migration negative electrode, is then focused on.Electric heating is repaired
It is to produce magnetic wave using high frequency voltage, soil is heated, chromium is separated from soil, so as to reach the purpose of reparation.Soil
Earth drip washing is that the chromium in solid phase of soil is transferred in liquid phase of soil using leacheate, then makees further place to the water containing chromium
Reason.Although physical chemistry repairing method advantage is a lot, consume energy larger, the limited area of reparation, easily causes secondary pollution etc. and is difficult to
The shortcoming for overcoming.
Chemical restoration is to adding modifying agent in soil, adsorbed, aoxidized, reduced or precipitated, change chromium in soil
Form present in earth, reduces the biological effectiveness of chromium.This method has that chemical reaction velocity is fast, repair time in short (several weeks
To some months), response intensity it is big, insensitive to pollutant property and concentration, to some be difficult to other method process it is organic
The advantages of thing tool high efficiency, be the chromium-polluted soil Treatment process of most practicality and potentiality.But because reducing agent reacts
There is certain condition, often produce secondary pollution or destruction soil texture.Such as ferrous sulfate reducing process, being reacted with Cr VI needs
Want (PH4)-Sour environment, at present using reaction before dilute sulfuric acid adjust pH value, be adjusted to neutrality with lime again after reaction, unavoidably
Secondary pollution can be introduced, while soil granular structure is destroyed, plant cannot grow on soil after reparation.Cut there is presently no one kind
Real effective reduction modifying agent.
Humic acid is the remains of animals and plants by a series of processes such as microorganism decomposition and conversion and physical chemistry of the earth
And the class macromolecular organic monoacid mixture for being formed, maintain various original preservation constituents and bioactivity and have
Abundant functional group, such as aromatic rings, conjugated double bond, hydroxyl, carboxyl, phenolic hydroxyl group, carbonyl.Humic acid repairs chromium-polluted soil,
Reaction environment need not be adjusted just efficiently can occur absorption and reduction reaction with the Cr VI in contaminated soil, then be formed
The complexing body of trivalent chromium, blocking oxide reaction, prevents the secondary oxidation of trivalent chromium.Other humic acid can also promote soil granular knot
It is configured to, the function of barriers function and improved soil with parcel chromium soil, it is ensured that rehabilitating soil recovers its plantation and afforests
Function, realize the permanent sustainable reparation of non-secondary pollution.So humic acid is most to be expected to industrialize and with practicality at present
A kind of chromium-polluted soil green in-situ renovation agent of property.It is easily right but dust is larger when chromium-polluted soil is crushed, work under bad environment
Workmen damages；Humic acid is well mixed difficulty, humic acid large usage quantity, high cost with soil；Soil reaches after improvement
There is the hidden danger for producing secondary pollution in mark overlong time, pilot process, such as in unexpected repair process, rain cause leachate suddenly
Cr VI is exceeded etc..
3. the content of the invention
It is dirty the invention aims to overcome the shortcomings of a kind of existing chromium invented containing technology of repairing chromium contaminated soil
Dye soil rotten phytic acid green in-situ renovation technique, can be by adding humic-acid-type substances in crushing process, depressant soil ratio is realized
Well mixed and reinforcing in-situ reducing, it is to avoid the pollution hidden trouble of burst leachate；Can ensure to administer soil by strong reductant again
Up to standard, shortening reduction reaction and assembly time, eliminate the pollution hidden trouble of burst leachate；Can also be pellet by liquid humic acid
Granulate, parcel blocks oozing out for Cr VI in particle and forever reduces and fix with migration, realization, and recovery soil plants function, in fact
Now safety, the permanent sustainable green in-situ reparation of low cost.
Technical scheme：
Chromium-polluted soil humic acid green in-situ renovation technique, the first step, while chromium-polluted soil adds pulverizer,
Compare 5-20 according to agent chromium:1 adds humic-acid-type substances prereduction, reinforcing mixing and haptoreaction while crushing, and improves rotten plant
The percent reduction of acid substance utilization rate and Cr VI；Second step, the prereduction chromium-polluted soil less than 3mm is aged more than 1 hour
Afterwards, according to the content of 6-valence Cr ions for detecting, 10-30 is compared according to agent chromium:1 sprays into strong reductant solution, is well mixed and forces also
It is former, it is to avoid powder spreading is polluted, it is ensured that to administer Soil K+adsorption up to standard；3rd step, chromium-polluted soil compares 1-5 according to agent soil after reduction:
100, spray into the pellet granulation of liquid humic acid, in parcel blocking particle Cr VI ooze out with migration, realize permanent reduction with
It is fixed, recover soil plantation function.
Wherein, humic-acid-type substances are the one kind or many in humic acid, humic acid potassium, sodium humate or biomass pyrolysis oil etc.
Kind；
Pulverizer is ball mill, gyratory crusher, toothed roll crusher, impact breaker, impact crusher, hammer
Disintegrating machine, gyratory crusher, compound crusher, hydraulic breaker, deep chamber disintegrating machine, kibbler roll, simon this circular cone
One kind in disintegrating machine, hydro cone-crusher, Europe version jaw crusher etc.；
Strong reductant is NaS2, sodium dithionite, FAS, sodium thiosulfate, sodium pyrosulfite, bisulfite
One or more in sodium, sodium sulfite etc..
Liquid humic acid form biomass pyrolysis oil, humic acid potassium solution or sodium humate solution.
Biomass pyrolysis oil is the bio oil that agriculture and forestry organic waste material fast pyrogenation fluid product or gasification are generated.
Implemented according to such scheme, tested, it was demonstrated that chromium-polluted soil restorative procedure of the present invention is reasonable, peace easy to operate
Entirely, low production cost, quality is good, efficiency high, realizes that in-situ reducing, complexing are fixed and parcel is blocked, and prevents secondary pollution, improves
Natural environment, repairs fast, and effect is good, and the soil after reparation can normally plant tree and grow flower, plants various crops, control expense
It is low, it is applied widely, economic and social benefits are improve, it has been properly arrived at predetermined purpose.
The present invention will come to describe the features of the present invention in detail in conjunction with the embodiments.
4. specific embodiment
Embodiment 1, the first step while chromium-polluted soil adds gyratory crusher, 10 is compared according to agent chromium:1 adds
50% sodium humate solution prereduction, strengthens while chromium-polluted soil is crushed and mixes with sodium humate；Produced due to crushing
Cr VI is fully contacted with sodium humate on raw fresh surfaces, reinforcing in-situ reducing reaction, improves humic-acid-type substances utilization rate
With the percent reduction (＞ 96%) of Cr VI, airborne dust is eliminated, reduce agent soil ratio, reduce the heap of pollution of chromium crushing soil high-volume
And digestion time；Second step, after the prereduction chromium-polluted soil less than 3mm is aged more than 1 hour, according to the sexavalence for detecting
Chromium content, 20 are compared according to agent chromium:1 sprays into 10% hypo solution, is well mixed and forces reduction, shortens reduction reaction
And assembly time, it is to avoid powder spreading is polluted, it is ensured that administer the detection of soil Cr VI up to standard；3rd step, chromium-polluted soil is pressed after reduction
Compare 3 according to agent soil:100, spray into the pellet granulation of biomass pyrolysis oil, parcel blocking particle in Cr VI ooze out with migration, really
Guarantor administers soil Cr VI and total chromium detects up to standard, and realization is permanent to reduce and fix, recovery soil plantation function, realization safety,
The permanent sustainable green in-situ reparation of low cost.
Sodium humate solution concentration can be adjusted according to the humidity of chromium-polluted soil in the first step, as long as meeting pulverizer to powder
The water content requirement of broken raw material.
Embodiment 2, the first step while chromium-polluted soil adds gyratory crusher, 10 is compared according to agent chromium:1 adds life
Material pyrolysis oil prereduction, strengthens while chromium-polluted soil is crushed and mixes with biomass pyrolysis oil；Due to crushing what is produced
Cr VI is fully contacted with biomass pyrolysis oil on fresh surfaces, reinforcing in-situ reducing reaction, improves biomass pyrolysis oil and utilizes
The percent reduction (＞ 96%) of rate and Cr VI, eliminates airborne dust, reduces agent soil ratio and rehabilitation cost, reduces pollution of chromium crushing
The heap of soil is high-volume and digestion time；Second step, after the prereduction chromium-polluted soil less than 3mm is aged more than 1 hour, according to
The content of 6-valence Cr ions for detecting, 10 are compared according to agent chromium:1 sprays into 8% hydrogensulfite solution, is well mixed and forces also
Original, shortens reduction reaction and assembly time, it is to avoid powder spreading is polluted, it is ensured that administer the detection of soil Cr VI up to standard；3rd step, reduction
Chromium-polluted soil compares 2 according to agent soil afterwards:100, the pellet granulation of biomass pyrolysis oil is sprayed into, Cr VI in parcel blocking particle
Ooze out and migration, it is ensured that administer soil Cr VI and the detection of total chromium is up to standard, realization is permanent to reduce and fixed, recovery soil plantation work(
Can, realize safety, the permanent sustainable green in-situ reparation of low cost.
When being tested, total chromium content in soil content：3000mg/kg, content of 6-valence Cr ions：1080mg/kg, pH value：10.2.Adopt
With chromium-polluted soil humic acid green in-situ renovation technique of the present invention, the first step compares 10 using agent chromium:1 biomass pyrolysis oil is pre-
After reduction, place 1 hour, sampling and testing then has been carried out to the soil after reparation.According to《Solid waste Leaching leaching side
Method-sulfonitric method》In leachate prepared by (HJ/T 299-2007), total chrome content：15.0mg/L, content of 6-valence Cr ions：
1.6mg/L, pH value：7.5.Second step compares 10 according to remaining Cr VI using agent chromium:1 sodium dithionite for spraying into 8% is forced
Reduction, after placing 0.5 hour, has then carried out sampling and testing to the soil after reparation, and content of 6-valence Cr ions is respectively less than in leachate
Detection limits (0.04mg/L), total chrome content：1.5mg/L.3rd step compares 2 using agent soil:100 biomass pyrolysis oil granule
Change granulation, after placing 30 days, sampling and testing again, total chrome content and content of 6-valence Cr ions are less than test detectable limit in leachate
Value.Flowers and plants, corn of soil plantation after reparation etc. can normal growths.
Claims (5)
1. chromium-polluted soil humic acid green in-situ renovation technique, it is characterized in that the first step, pulverizer is added in chromium-polluted soil
While, compare 5-20 according to agent chromium:1 adds humic-acid-type substances prereduction, and reinforcing mixing and haptoreaction, carry while crushing
The percent reduction of high humic acid material utilization and Cr VI；Second step is small by the prereduction chromium-polluted soil ageing 1 less than 3mm
When more than after, according to the content of 6-valence Cr ions for detecting, 10-30 is compared according to agent chromium:1 spray into strong reductant solution, be well mixed and
Force reduction, it is to avoid powder spreading is polluted, it is ensured that administer Soil K+adsorption up to standard；3rd step, chromium-polluted soil compares according to agent soil after reduction
1-5:100, the penetrating pellet granulation of liquid humic acid, oozing out for Cr VI is forever gone back with migration, realization in parcel blocking particle
It is former and fixed, recover soil plantation function.
2. chromium-polluted soil humic acid green in-situ renovation technique according to claim 1, it is characterised in that humic acid thing
Matter is one or more in humic acid, humic acid potassium, sodium humate or biomass pyrolysis oil etc..
3. chromium-polluted soil humic acid green in-situ renovation technique according to claim 1, it is characterised in that pulverizer is
Ball mill, gyratory crusher, toothed roll crusher, impact breaker, impact crusher, hammer mill, rotary type break
Broken machine, compound crusher, hydraulic breaker, deep chamber disintegrating machine, kibbler roll, simon this gyratory crusher, hydraulic cone
One kind in disintegrating machine, Europe version jaw crusher etc..
4. chromium-polluted soil humic acid green in-situ renovation technique according to claim 1, it is characterised in that liquid is rotten to plant
Sour form biomass pyrolysis oil, humic acid potassium solution or sodium humate solution.
5. chromium-polluted soil humic acid green in-situ renovation technique according to claim 1, it is characterised in that strong reductant
It is NaS2, sodium dithionite, FAS, sodium thiosulfate, sodium pyrosulfite, sodium hydrogensulfite, in sodium sulfite etc.
One or more.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111167851A (en) * | 2020-01-16 | 2020-05-19 | 张君 | Remediation method for applying humic acid to soil remediation |
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| CA2559331A1 (en) * | 2006-09-07 | 2008-03-07 | Meng J. Li | Composition and process for chromium contaminant fixation in soil |
| CN106180172A (en) * | 2016-07-18 | 2016-12-07 | 中国石油大学(华东) | Chromium-polluted soil humic acids green in-situ renovation technique |
| CN106180171A (en) * | 2016-07-18 | 2016-12-07 | 中国石油大学(华东) | Chromium-polluted soil humic acids segmentation clean and effective prosthetic device |
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| CA2559331A1 (en) * | 2006-09-07 | 2008-03-07 | Meng J. Li | Composition and process for chromium contaminant fixation in soil |
| CN106180172A (en) * | 2016-07-18 | 2016-12-07 | 中国石油大学(华东) | Chromium-polluted soil humic acids green in-situ renovation technique |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111167851A (en) * | 2020-01-16 | 2020-05-19 | 张君 | Remediation method for applying humic acid to soil remediation |
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Application publication date: 20170620 |