CN109233866A - The passivator and restorative procedure of alkalescent soil for cadmium pollution - Google Patents
The passivator and restorative procedure of alkalescent soil for cadmium pollution Download PDFInfo
- Publication number
- CN109233866A CN109233866A CN201811461723.6A CN201811461723A CN109233866A CN 109233866 A CN109233866 A CN 109233866A CN 201811461723 A CN201811461723 A CN 201811461723A CN 109233866 A CN109233866 A CN 109233866A
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- CN
- China
- Prior art keywords
- soil
- passivator
- montmorillonite
- cow dung
- alkalescent
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2101/00—Agricultural use
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to soil remediation fields, more particularly to the soil remediation field of heavy metal pollution, and in particular to the passivator and restorative procedure of the alkalescent soil for cadmium pollution.The passivator is made of montmorillonite and cow dung.The amount of application of the passivator is 16%.Montmorillonite and cow dung, which combine the composite passivant to be formed, can significantly reduce available state Cd concentration in contaminated agricultural land soil.Meanwhile through overtesting as can be seen that for montmorillonite combines the composite passivant to be formed with cow dung compared to cow dung or montmorillonite is administered alone, both there is preferably passivation repairing effect, and be significantly higher than the sum of deactivation rate.When the amount of application of passivator is 16%, deactivation rate can reach 81.48%.Therefore, the present invention provides more efficiently new way for the alkalescent agricultural land soil reparation of heavy metal pollution.
Description
Technical field
The present invention relates to soil remediation fields, more particularly to the soil remediation field of heavy metal pollution, and in particular to use
In the passivator and restorative procedure of the alkalescent soil of cadmium pollution.
Background technique
Soil distinguishes neutral soils, basic soil and acid soils according to the different of its pH.Wherein PH is 7 or more
Soil is known as basic soil, and more specifically when pH is known as alkalescent soil in the soil of 7-8 or so.
Substance contained in the soil of different pH values and relevant ions concentration have differences, therefore, for contaminated
For soil, it is necessary to understand its acid-base property first, further the passivator suitable for different acid-base property condition research and development.
After soil is by cadmium pollution, cadmium can be enriched in vivo, entered human body by food chain and caused slow poisoning.
Near industrialization factories and miness and its leeward is to equal regions is all the heavy calamity of cadmium pollution.If these soils cannot obtain rationally
Reparation such as Passivation Treatment, then can only fall into disuse.
Cadmium pollution is one kind of heavy metal pollution.For the purpose of heavy-metal contaminated soil reparation, mainly there are two sides at present
Face: first is that reducing the total amount of heavy metal in soil, second is that reducing the validity of heavy metal, but on condition that guarantee that soil fertility is unknown
Aobvious decline.Common heavy-metal contaminated soil reclamation activities mainly has phytoremediation technology, physical chemistry recovery technique etc..Its
In, as a kind of physical chemistry recovery technique, a certain amount of passivator is added into soil can make the effective of heavy metal in soil
Property reduce, to reduce the ability that heavy metal is migrated to crop.
For example, in patent application 201710858633.X, a kind of soil-repairing agent of Cd-polluted farmland is disclosed, wherein
Including 5-20 parts of montmorillonite, 5-20 parts of magnesia, biological calcium material 15-45 parts and charcoal 15-45 parts, to utilize four kinds of objects
The systemic effect of matter, which achievees the purpose that reduce in soil, free cadmium content.
Again for example, in patent application 201810522589.X, disclosing a kind of reduces geobiont available Cd
Soil passivator, including animal bone powder 30wt%-50wt%, siliceous fertilizer 30wt%-50wt%, biological calcium material 0-
20wt%, animal waste 0-20wt% are absorbed and utilized cadmium to reduce crop using synergistic effect each other.
Thus we have seen that, the group mode of optimization is found, by the performance of synergistic effect, to improve repairing for passivator
Multiple effect is the difficulty that field is repaired in research hotspot and the soil remediation field of current those skilled in the art, especially farmland
Point problem.
Summary of the invention
The technical problem to be solved by the present invention is to develop a kind of composite passivant, by each in composite passivant prescription
Component collaboration plays a role, to effectively improve the passivation repair to contaminated soil.
In order to solve the above-mentioned technical problem, the invention discloses a kind of passivator of alkalescent soil for cadmium pollution,
The passivator is made of montmorillonite and cow dung.
As further preferred technical solution, the weight ratio of the montmorillonite and cow dung is 1:1.
The restorative procedure of the invention also discloses a kind of simultaneously alkalescent soil restoring cadmium polluted using above-mentioned passivator,
The following steps are included:
S1: the passivator being made of montmorillonite and cow dung is added in contaminated soil；
S2: the maximum field capacity for keeping soil is 70-80%, balance.
The additional amount of passivator is 16% (w/w, passivator and soil in the step S1 as a preferred technical solution,
The mass percent of earth).
In a preferred technical solution, in the step S2, balance 7 days.
Montmorillonite and cow dung, which combine the composite passivant to be formed, can significantly reduce available state in contaminated agricultural land soil
Cd concentration.Meanwhile by experiment as can be seen that montmorillonite combines the composite passivant to be formed with cow dung compared to ox is administered alone
The sum of for excrement or montmorillonite, there is preferably passivation repairing effect, and be significantly higher than the two deactivation rate.When passivator
When amount of application is 16%, deactivation rate can reach 81.48%.Therefore, the present invention is the alkalescent agricultural land soil of heavy metal pollution
Reparation provides more efficiently new way.
And it is worth noting that passivator source disclosed by the invention is easy to get, at low cost, the two complex method is simple
It is single, and combined efficiency is high.Simultaneously as largely using cow dung, therefore the bio-waste of the farm can be rationally utilized,
It is a kind of effective Recycling Economy System, meets the developing direction of circular agriculture.It is disclosed in this invention blunt based on above-mentioned advantage
Agent and restorative procedure are a kind of at low cost, high-efficient soil remediation methods, be can significantly improve by the soil of cadmium pollution
Physicochemical property has great market popularization value.
Specific embodiment
In order to better understand the present invention, we in conjunction with specific embodiments further explain the present invention below
It states.
Embodiment 1
The configuration of 1.1 cadmium pollutions test soil
Southern area of Jiangsu Province agricultural land soil is taken, after measured, pH 7.20, by Cd with CdCl2Form is added in soil and balances
January, the concentration 3mg/kg of Cd in the soil.
The preparation of 1.2 passivator
Commercially available montmorillonite is mixed with the cow dung that farm normally dries with weight ratio 1:1, is mixed to uniform.
The application of 1.3 passivator
Configured cadmium pollution test soil in 10g 1.1 is taken, and applies the composite passivant prepared in 1.2 or only applies
It is specific to handle (each processing has 3 parallel tests) as follows with montmorillonite or cow dung:
4% (w/w), 8% (w/w), the composite passivant prepared in 16% (w/w) 1.2 are added in processing 1,2,3 respectively
Into the soil of cadmium pollution；Processing 4-9 only applies montmorillonite or cow dung, and 2% montmorillonite is only added in processing 4, processing 5 is only added
2% cow dung, processing 6 only add 4% montmorillonite, 4% cow dung is only added in processing 7,8% montmorillonite is only added in processing 8, handle 9 only
Add 8% cow dung；Any passivator is not added in processing 10, is labeled as blank test.
The soil for adding passivator is mixed, and keeps the maximum field capacity of 70-80%, is balanced 7 days.
The detection of 1.4 repairing effects
Referring to " the measurement diethylene triamine pentacetic acid (DTPA) extraction of 8 kinds of available state elements of soil-inductively coupled plasma body transmitting
Spectroscopic methodology " (HJ 804-2016), extract and measure the available state Cd concentration in soil (present invention in meaning available state Cd be
Diethylene triamine pentacetic acid (DTPA) (DTPA) bound residue Cd).
Meanwhile according to effective Cd concentration calculation deactivation rate:
Deactivation rate=(the effective Cd concentration of space management soil-addition passivator handles the effective Cd concentration of soil)/blank space
Manage the effective Cd concentration * 100 of soil；
The results are shown in Table 1:
| Number | Effective Cd concentration (mg/kg) | Deactivation rate average value (3 parallel tests) |
| Processing 1 | 2.207 | 17.77% |
| Processing 2 | 1.679 | 37.44% |
| Processing 3 | 0.497 | 81.48% |
| Processing 4 | 2.677 | 0.26% |
| Processing 5 | 2.543 | 5.25% |
| Processing 6 | 2.704 | - 0.75% |
| Processing 7 | 2.069 | 22.91% |
| Processing 8 | 2.586 | 3.65% |
| Processing 9 | 1.225 | 54.36% |
| Handle 10 (blank) | 2.684 | - |
The result shows that montmorillonite-cow dung organic fertilizer composite passivant is to the available state Cd concentration reduced in the agricultural land soil
There are remarkable result, passivation when composite passivant will be significantly higher than montmorillonite to the deactivation rate of Cd, cow dung organic fertilizer is administered alone
The sum of rate.When additive amount is 16%, composite passivant is up to 81.48% to the deactivation rate of Cd.
The foregoing is a specific embodiment of the present invention.It should be pointed out that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (5)
1. the passivator of the alkalescent soil for cadmium pollution, it is characterised in that: the passivator is made of montmorillonite and cow dung.
2. the passivator of the alkalescent soil according to claim 1 for cadmium pollution, it is characterised in that: the montmorillonite
Weight ratio with cow dung is 1:1.
3. a kind of restorative procedure of the restoring cadmium polluted alkalescent soil based on passivator of any of claims 1 or 2, including
Following steps:
S1: the passivator being made of montmorillonite and cow dung is added in contaminated soil；
S2: the maximum field capacity for keeping soil is 70-80%, balance.
4. restorative procedure according to claim 3, it is characterised in that: the additional amount of passivator is in the step S1
16%.
5. restorative procedure according to claim 3, it is characterised in that: in the step S2, balance 7 days.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811461723.6A CN109233866A (en) | 2018-12-02 | 2018-12-02 | The passivator and restorative procedure of alkalescent soil for cadmium pollution |
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| CN201811461723.6A CN109233866A (en) | 2018-12-02 | 2018-12-02 | The passivator and restorative procedure of alkalescent soil for cadmium pollution |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110125161A (en) * | 2019-04-30 | 2019-08-16 | 湖南大学 | A kind of heavy metal soil-repairing agent and method cooperateing with compost based on magnesia-montmorillonite composite material |
| CN112745856A (en) * | 2021-01-21 | 2021-05-04 | 中国科学院南京土壤研究所 | Application of humic acid as repairing material in reducing bioavailability of alkalescent soil Cd |
| WO2022155832A1 (en) * | 2021-01-21 | 2022-07-28 | 中国科学院南京土壤研究所 | Remediation material for reducing cadmium bioavailability in soil and application thereof in passivation remediation for weakly alkaline soil |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106518228A (en) * | 2016-10-28 | 2017-03-22 | 青岛农业大学 | Biochar-based fertilizer with effect of reducing heavy metal cadmium absorption of vegetables and application method thereof |
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2018
- 2018-12-02 CN CN201811461723.6A patent/CN109233866A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106518228A (en) * | 2016-10-28 | 2017-03-22 | 青岛农业大学 | Biochar-based fertilizer with effect of reducing heavy metal cadmium absorption of vegetables and application method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 夏增禄等: "《土壤容量化学》", 30 April 1989, 气象出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110125161A (en) * | 2019-04-30 | 2019-08-16 | 湖南大学 | A kind of heavy metal soil-repairing agent and method cooperateing with compost based on magnesia-montmorillonite composite material |
| CN112745856A (en) * | 2021-01-21 | 2021-05-04 | 中国科学院南京土壤研究所 | Application of humic acid as repairing material in reducing bioavailability of alkalescent soil Cd |
| WO2022155832A1 (en) * | 2021-01-21 | 2022-07-28 | 中国科学院南京土壤研究所 | Remediation material for reducing cadmium bioavailability in soil and application thereof in passivation remediation for weakly alkaline soil |
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