CN107737803A - A kind of restorative procedure in heavy metal cadmium arable land - Google Patents
A kind of restorative procedure in heavy metal cadmium arable land Download PDFInfo
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- CN107737803A CN107737803A CN201711189498.0A CN201711189498A CN107737803A CN 107737803 A CN107737803 A CN 107737803A CN 201711189498 A CN201711189498 A CN 201711189498A CN 107737803 A CN107737803 A CN 107737803A
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- arable land
- heavy metal
- restorative procedure
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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
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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
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a kind of restorative procedure in heavy metal cadmium arable land, comprise the following steps：Add water into arable land, arable land is soaked in water；Iron salt solutions are added to the heavy metal pollution arable land after processing, is turned over, is broken rear smooth；One layer of tunica fibrosa is covered in soil surface；It is a circulation to repeat abovementioned steps.Wherein, it is 0.5 1.5cm that distance of the water surface to surface of ploughing is soaked during standing, turn over, broken number is 13 times, the concentration of iron salt solutions is 0.5 1.5mg/L, molysite is one kind in iron chloride, ferric sulfate, tunica fibrosa be containing activated carbon, modification infusorial earth, modified kaolin polypropylene fibre film, tunica fibrosa covering time be 35 days, cycle-index be 35 times.Restorative procedure treatment effect provided by the present invention is obvious, the cadmium content in heavy metal pollution arable land can effectively be reduced, reagents such as used iron chloride, polypropylene fibre film and material valency is low is easy to get, reduce processing cost, it is fast that treatment effeciency is high, speed is repaired in arable land.
Description
Technical field
The invention belongs to Farmland contamination Treatment process field, and in particular to a kind of reparation side in heavy metal cadmium arable land
Method.
Background technology
Heavy metal pollution of soil refers to that due to mankind's activity content of the minor metallic element in soil in soil exceedes
Background value, too high levels caused by excess deposition, is referred to as heavy metal pollution of soil.Heavy metal refers to that proportion is equal to or more than
5.0 metal, mainly including the significant element of the bio-toxicity such as cadmium, mercury, lead, chromium and metalloid arsenic, and there is certain toxicity
The elements such as zinc, copper, nickel.These pollution elements are essentially from agricultural chemicals, waste water, sludge and atmospheric sedimentation etc., as cadmium, lead contamination are main
From discharge and automobile exhaust gas sedimentation is smelted, essentially from mercury-containing waste water, arsenic is then widely used as insecticide, bactericide, killed mercury
Mouse agent and herbicide.Excessive heavy metal can cause physiological function of plants disorder, the element such as trophic disturbance, cadmium, mercury in crop grain
Middle concentration coefficient is higher, even more than food hygienic standard, nor affects on plant growth, development and yield, mercury, arsenic can subtract in addition
Nitrification, amonifying bacteria activity, influence Nitrogen supplying in weak and suppression soil.Heavy metal contaminants mobility very little in soil,
It is not microbial degradation, after entering human body by food chain, potential hazard is very big.Stone row is not yet established in some mines in exploitation
Field and Tailings Dam, barren rock and mine tailing are arbitrarily stacked, and cause to enter soil rich in the heavy metal being difficult to resolve in mine tailing, in addition ore processing
Remaining metal waste residue enters ground water regime with rainwater afterwards, causes serious heavy metal pollution of soil.Industrially really it is included in
Heavy metal has 10 kinds of metallic elements：Copper, lead, zinc, tin, nickel, cobalt, antimony, mercury, cadmium and bismuth.And from the angle of soil-plant system
For, international educational circles thinks, the greatest risk that only element such as cadmium, cobalt, selenium damages to animals and humans health.Because food
Thing chain and cause health impaired, mainly cadmium and selenium.The rice that the multiple places of production of China produce is found cadmium exceeded, soil
Pollution the appearance of cadmium rice crisis, has beaten the alarm bell of soil pollution into public hazards.
The reclamation activities in heavy metal cadmium arable land is repaiied including chemical harnessing, Agro-ecology reparation, microorganism remediation, animal
Multiple and phytoremediation.Wherein chemical harnessing include leaching method, using modifying agent the methods of, weight can be reduced in soil in a short time
The toxicity and biological effectiveness of metal, artificially apply chemical agent into soil, easily cause secondary pollution, and this method is a kind of
In-situ remediation method, heavy metal cadmium are still remained in soil, and easy reactivation endangers plant, and its potential threat does not eliminate.
Agricultural and restoration of the ecosystem are by adjusting such as soil moisture, soil pH value, soil cation exchange capacity, calcium carbonate and Soil oxidation
The factor such as reduction situation and gas epidemic disaster, bioavailability of cadmium is reduced, to weaken the toxic action of heavy metal on plants, although
Cd fractionation is changed, but is still suffered from soil, easy reactivation, and harm is produced to biology.Microorganism remediation includes life
Thing absorption, extracellular precipitation, bioconversion, bioaccumulation and outer row effect.On the one hand microorganism can reduce heavy metal in soil
Toxicity, and accumulation heavy metal can be adsorbed；On the other hand root system microenvironment can be changed, so as to improve plant heavy metal
Absorption, volatilization or fixed efficiency.At present, most of microorganism remediation technology is also confined to scientific research and laboratory level, and example is ground
Study carefully also seldom, can not be widely applied.Animal reparation carries out heavy metal cadmium dirt using such as earthworm of some lower animals in soil
The research that dye is repaired still is confined to laboratory stage, and because being restricted by factors such as lower animal growing environments, its remediation efficiency one
As, it is not a kind of preferable recovery technique.Phytoremediation by certain specific planting on the soil of heavy metal pollution,
There is special absorption accumulation ability to the pollution element in soil, by plant harvest and dealt carefully with (as ashing is reclaimed)
Heavy-metal movement is gone out into the soil body afterwards, reaches the purpose of pollution control and restoration of the ecosystem.Heavy metal cadmium adsorbs, is deposited on soil in arable land
In particle, under waterflooding anaerobic condition, heavy metal cadmium, which will separate out, enters solution system, is more located in Interstitial Water.Therefore, go
Except the heavy metal cadmium in Interstitial Water is the most effective approach that arable land is repaired.
Chinese invention patent (CN103788960A) discloses multi-Functional Fertilizers and the reparation of a kind of repairing heavy metal in soil
Agent, attapulgite modified, chitosan, biological carbon and four kinds of materials progress of sodium thiosulfate are compound, although soil can be reduced
The toxicity and dissolubility of middle heavy metal, but preparation technology is complicated, cost is high.Chinese invention patent document (CN107052043A)
Disclose it is a kind of using the root of kudzu vine come the method for restoration of soil polluted by heavy metal, the invention utilizes root of kudzu vine root system by planting the root of kudzu vine
Secretion activates to the heavy metal in soil, then realizes enrichment to activation heavy metal by the organic matter on root system surface, leads to
Cross and remove the root of kudzu vine and complete pretreatment to soil, although the method, suitable for the soil remediation of large area, but not only time-consuming, together
When also to ensure the survival of the root of kudzu vine.Chinese invention patent document (CN105149337A) discloses a kind of heavy metal cadmium arable land
Soil remediation method, this method first into the arable land by cadmium pollution water-filling, then added into arable land compound with repair medicament
The aqueous solution is reacted, and is stood after turning over stirring, then reaction water is drawn into flocculating setting processing.Although this method can be to by cadmium
The arable soil of pollution is repaired, but the medicament added into arable land easily causes secondary pollution, and after flocculating setting
Heavy metal precipitation can mix in soil, it is difficult to separation is clean.
To sum up, at present still without it is a kind of can quickly, low cost, efficiently repair heavy metal cadmium arable land method.
The content of the invention
To solve the shortcomings of the prior art, the invention provides a kind of restorative procedure in heavy metal cadmium arable land.
To achieve the above object, the present invention uses following technical scheme：
A kind of restorative procedure in heavy metal cadmium arable land, comprises the following steps：
(1) add water into arable land, arable land is soaked in water, stand；
(2) molysite is added to the arable land after step (1) processing, is turned over, be broken rear smooth；
(3) the arable land surface after step (2) processing covers one layer of tunica fibrosa；
(4) repeat step (1)-(3) are a circulation.
Preferably, distance of the immersion water surface to surface of ploughing is 0.5-1.5cm in the step (1).
Preferably, the time of repose in the step (1) is 5-7 days.
Preferably, the number turned in the step (2), crushed is 1-3 times.
Preferably, the addition of molysite is the iron salt concentration in arable land is reached 0.5-1.5mg/L in the step (2).
Preferably, the molysite in the step (2) is one kind in iron chloride, ferric sulfate.
Preferably, the tunica fibrosa in the step (3) is polypropylene fibre film.
It is further preferred that described polypropylene fibre film contains activated carbon, modification infusorial earth and modified kaolin absorption
At least one of agent.
Preferably, the time that tunica fibrosa covers in the step (3) is 3-5 days.
Preferably, the cycle-index in the step (4) is 3-5 times.
The purpose that iron chloride is added in step (1) is that ferric iron displaces the cadmium ion that soil particle adsorbs, chlorion network
The cadmium ion of activating soil granular absorption is closed, after step (2) soil surface covers a layer polypropylene tunica fibrosa, is reduced in soil
Ferrous ion migrated to the high liquid level of oxygen concentration, with oxygen on polypropylene fibre film aggreation generation adsorptivity pole
Strong unformed ferriferous oxide, so as to adsorb the cadmium ion discharged in soil, polypropylene fibre film contained activity in itself
One or more in charcoal, modification infusorial earth and modified kaolin adsorbent also have very strong adsorptivity to cadmium, can adsorptional earth
The cadmium ion that earth particle discharges.
Beneficial effects of the present invention
1st, restorative procedure treatment effect provided by the present invention is obvious, can effectively reduce the cadmium in heavy metal pollution arable land
Content；
2nd, the iron chloride used in the present invention, the reagent such as polypropylene fibre film and material valency is low is easy to get, reduce cadmium dirt
Contaminate the processing cost in arable land；
3rd, method provided by the present invention is easy to operation, the overall planning of polylith soil, linkage can be handled simultaneously, processing
Efficiency high, arable land reparation speed are fast.
Embodiment
Embodiment 1
For a certain piece of arable land by heavy metal cadmium, area is 2 mu, and the average value of heavy metal in soil cadmium is
0.48mg/kg, exceeded more than 1 times, it is repaired by the following method：
(1) add water into arable land, arable land is soaked in water, arable land is soaked in water 5 days；
(2) 0.5mg/L ferric chloride solutions are added to the arable land after step (1) processing, turned over, it is broken 1 time after it is smooth；
(3) soil surface after step (2) processing covers one layer of tunica fibrosa for being free of adsorbent, covers 3 days；
(4) repeat step (1)-(3), are repeated 3 times.
Front and rear cadmium content in ploughing is repaired in detection.
Embodiment 2
For a certain piece of arable land by heavy metal cadmium, area is 2 mu, and the average value of heavy metal in soil cadmium is
0.63mg/kg, exceeded more than 2 times, it is repaired by the following method：
(1) add water into arable land, arable land is soaked in water, arable land is soaked in water 5 days；
(2) 0.8mg/L ferric chloride solutions are added to the arable land after step (1) processing, turn over, it is broken 1 time after it is smooth；
(3) soil surface after step (2) processing covers one layer of tunica fibrosa containing activated carbon, covers 3 days；
(4) repeat step (1)-(3), are repeated 3 times.
Front and rear cadmium content in ploughing is repaired in detection.
Embodiment 3
For a certain piece of arable land by heavy metal cadmium, area is 2 mu, and the average value of heavy metal in soil cadmium is
1.22mg/kg, exceeded more than 4 times, it is repaired by the following method：
(1) add water into arable land, arable land is soaked in water, arable land is soaked in water 5 days；
(2) 0.8mg/L ferric chloride solutions are added to the arable land after step (1) processing, turned over, it is broken 3 times after it is smooth；
(3) soil surface after step (2) processing covers one layer of tunica fibrosa containing activated carbon, covers 5 days；
(4) repeat step (1)-(3), are repeated 3 times.
Front and rear cadmium content in ploughing is repaired in detection.
Embodiment 4
For a certain piece of arable land by heavy metal cadmium, area is 2 mu, and the average value of heavy metal in soil cadmium is 2mg/
Kg, exceeded more than 6 times, it is repaired by the following method：
(1) add water into arable land, arable land is soaked in water, arable land is soaked in water 5 days；
(2) 0.8mg/L ferric chloride solutions are added to the arable land after step (1) processing, turned over, it is broken 3 times after it is smooth；
(3) soil surface after step (2) processing covers one layer of tunica fibrosa containing activated carbon, covers 5 days；
(4) repeat step (1)-(3), are repeated 5 times.
Front and rear cadmium content in ploughing is repaired in detection.
Embodiment 5
For a certain piece of arable land by heavy metal cadmium, area is 2 mu, and the average value of heavy metal in soil cadmium is
3.7mg/kg, exceeded more than 10 times, it is repaired by the following method：
(1) add water into arable land, arable land is soaked in water, arable land is soaked in water 5 days；
(2) 0.8mg/L ferric chloride solutions are added to the arable land after step (1) processing, turned over, it is broken 3 times after it is smooth；
(3) one layer of the soil surface covering after step (2) processing contains activated carbon, modification infusorial earth and modified kaolin
Tunica fibrosa, cover 5 days；
(4) repeat step (1)-(3), are repeated 5 times.
Front and rear cadmium content in ploughing is repaired in detection.
Embodiment 6
The present embodiment compares the cadmium content in being ploughed before and after embodiment 1-5 is repaired, and testing result is as shown in table 1.
Table 1 repairs front and rear cadmium content in ploughing
| Cadmium content/(mg/kg) | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| Preprosthetic arable land | 0.48 | 0.63 | 1.22 | 2 | 3.7 |
| Arable land after reparation | 0.21 | 0.26 | 0.32 | 0.28 | 0.3 |
| Reduced rate | 0.56 | 0.59 | 0.74 | 0.86 | 0.92 |
Comparing embodiment 1 and 2, although the average value of the heavy metal in soil cadmium of embodiment 2 is 0.63mg/kg, more than implementation
0.48mg/kg in the soil of example 1, the reduced rate of cadmium content in front and rear plough is repaired from 56% lifting to 59%, illustrates that molysite is molten
The activated carbon contained in the increase of liquid concentration and tunica fibrosa can lift the treatment effect to cadmium.Compare comparing embodiment 3 and 4,
Although the average value of the heavy metal in soil cadmium of embodiment 4 is 2mg/kg, more than the 1.22mg/kg in the soil of embodiment 3, before reparation
The reduced rate of cadmium content illustrates that cycle-index has large effect to treatment effect from 74% lifting to 86% in ploughing afterwards.
Compare comparing embodiment 4 and 5, repair the reduced rate of cadmium content in front and rear plough from 86% lifting to 92%, illustrate in tunica fibrosa
Synergy between the three kinds of adsorbents contained be present, when containing three kinds of adsorbents in tunica fibrosa, to the regulation effect of cadmium more preferably.
Claims (10)
1. a kind of restorative procedure in heavy metal cadmium arable land, it is characterised in that comprise the following steps：
(1) add water into arable land, arable land is soaked in water, stand；
(2) molysite is added to the arable land after step (1) processing, is turned over, be broken rear smooth；
(3) the arable land surface after step (2) processing covers one layer of tunica fibrosa；
(4) repeat step (1)-(3) are a circulation.
2. the restorative procedure in heavy metal cadmium arable land according to claim 1, it is characterised in that in the step (1)
It is 0.5-1.5cm to soak distance of the water surface to surface of ploughing.
3. the restorative procedure in heavy metal cadmium arable land according to claim 1, it is characterised in that in the step (1)
Time of repose be 5-7 days.
4. the restorative procedure in heavy metal cadmium arable land according to claim 1, it is characterised in that in the step (2)
The number turned over, crushed is 1-3 times.
5. the restorative procedure in heavy metal cadmium arable land according to claim 1, it is characterised in that in the step (2)
The addition of molysite is the iron salt concentration in arable land is reached 0.5-1.5mg/L.
6. the restorative procedure in heavy metal cadmium arable land according to claim 1, it is characterised in that in the step (2)
One kind for iron chloride, in ferric sulfate of molysite.
7. the restorative procedure in heavy metal cadmium arable land according to claim 1, it is characterised in that in the step (3)
Tunica fibrosa be polypropylene fibre film.
8. the restorative procedure in heavy metal cadmium arable land according to claim 7, it is characterised in that described polypropylene is fine
Dimension film contains at least one of activated carbon, modification infusorial earth and modified kaolin adsorbent.
9. the restorative procedure in heavy metal cadmium arable land according to claim 1, it is characterised in that in the step (3)
The time of tunica fibrosa covering is 3-5 days.
10. the restorative procedure in heavy metal cadmium arable land according to claim 1, it is characterised in that in the step (4)
Cycle-index be 3-5 times.
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Cited By (9)
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| CN109351764A (en) * | 2018-10-25 | 2019-02-19 | 上海十方生态园林股份有限公司 | The passivator of cadmium in one kind of multiple heavy-metal contaminated soils |
| CN110052491A (en) * | 2019-05-07 | 2019-07-26 | 孙天民 | A kind of restorative procedure of heavy-metal contaminated soil |
| CN110947364A (en) * | 2019-12-12 | 2020-04-03 | 甘肃农业大学 | Heavy metal contaminated soil remediation agent and application thereof |
| CN112872002A (en) * | 2021-02-02 | 2021-06-01 | 华中农业大学 | Application of selenium combined pseudomonas aeruginosa in strengthening phytoremediation of cadmium-nonylphenol composite contaminated soil |
| CN113042518A (en) * | 2021-03-12 | 2021-06-29 | 中南大学 | Method for reinforcing transmission of chemical repairing agent for heavy metal polluted site |
| CN113210413A (en) * | 2021-04-15 | 2021-08-06 | 贵州省土壤肥料研究所(贵州省生态农业工程技术研究中心)(贵州省农业资源与环境研究所) | Method for repairing heavy metal cadmium and continuous cropping obstacles in facility agriculture soil |
| CN114226432A (en) * | 2020-09-09 | 2022-03-25 | 农业农村部环境保护科研监测所 | Method for repairing cadmium-arsenic polluted water field and cadmium-arsenic detoxification device |
| CN115351064A (en) * | 2022-07-01 | 2022-11-18 | 佛山市植宝生态科技有限公司 | Silicon-based curing agent, repairing agent and repairing method for repairing soil polluted by vanadium/cadmium |
| CN115430699A (en) * | 2022-08-26 | 2022-12-06 | 上海化工院环境工程有限公司 | Heavy metal polluted paddy field in-situ leaching system and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109351764A (en) * | 2018-10-25 | 2019-02-19 | 上海十方生态园林股份有限公司 | The passivator of cadmium in one kind of multiple heavy-metal contaminated soils |
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| CN110947364A (en) * | 2019-12-12 | 2020-04-03 | 甘肃农业大学 | Heavy metal contaminated soil remediation agent and application thereof |
| CN114226432A (en) * | 2020-09-09 | 2022-03-25 | 农业农村部环境保护科研监测所 | Method for repairing cadmium-arsenic polluted water field and cadmium-arsenic detoxification device |
| CN112872002A (en) * | 2021-02-02 | 2021-06-01 | 华中农业大学 | Application of selenium combined pseudomonas aeruginosa in strengthening phytoremediation of cadmium-nonylphenol composite contaminated soil |
| CN113042518A (en) * | 2021-03-12 | 2021-06-29 | 中南大学 | Method for reinforcing transmission of chemical repairing agent for heavy metal polluted site |
| CN113210413A (en) * | 2021-04-15 | 2021-08-06 | 贵州省土壤肥料研究所(贵州省生态农业工程技术研究中心)(贵州省农业资源与环境研究所) | Method for repairing heavy metal cadmium and continuous cropping obstacles in facility agriculture soil |
| CN113210413B (en) * | 2021-04-15 | 2022-05-10 | 贵州省土壤肥料研究所(贵州省生态农业工程技术研究中心)(贵州省农业资源与环境研究所) | Method for repairing heavy metal cadmium and continuous cropping obstacles in facility agriculture soil |
| CN115351064A (en) * | 2022-07-01 | 2022-11-18 | 佛山市植宝生态科技有限公司 | Silicon-based curing agent, repairing agent and repairing method for repairing soil polluted by vanadium/cadmium |
| CN115430699A (en) * | 2022-08-26 | 2022-12-06 | 上海化工院环境工程有限公司 | Heavy metal polluted paddy field in-situ leaching system and application thereof |
| CN115430699B (en) * | 2022-08-26 | 2023-08-29 | 上海化工院环境工程有限公司 | Heavy metal polluted paddy field in-situ leaching system and application thereof |
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Denomination of invention: A Remediation Method for Heavy Metal Cadmium Polluted Farmland Effective date of registration: 20230615 Granted publication date: 20210319 Pledgee: Hunan Xiangjiang New Area Rural Commercial Bank Co.,Ltd. Pledgor: HUNAN NEWWORLD SCIENCE AND TECHNOLOGY Co.,Ltd. Registration number: Y2023980044115 |