CN106623381A - Restoration method of heavy metal contaminated soil - Google Patents
Restoration method of heavy metal contaminated soil Download PDFInfo
- Publication number
- CN106623381A CN106623381A CN201611149173.5A CN201611149173A CN106623381A CN 106623381 A CN106623381 A CN 106623381A CN 201611149173 A CN201611149173 A CN 201611149173A CN 106623381 A CN106623381 A CN 106623381A
- Authority
- CN
- China
- Prior art keywords
- soil
- ids
- heavy metal
- metal contaminated
- contaminated soil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
-
- 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
Abstract
The invention belongs to the technical field of restoration of heavy metal contaminated soil and particularly relates to a restoration method of the heavy metal contaminated soil. The restoration method is characterized by comprising the following steps that firstly, the soil to be processed is crushed so as to be screened conveniently; secondly, the crushed soil is screened through a screening device so that soil meeting the pore diameter requirement can be left for restoration; thirdly, an IDS eluting agent is prepared, specifically, the concentration of the IDS eluting agent is 7-11 mmol/L; fourthly, the soil obtained through screening is eluted with the IDS eluting agent; fifthly, filter pressing is carried out so that the eluted soil can be separated from waste fluid; and sixthly, the IDS eluting agent in the waste fluid obtained through separation is recycled, and the soil subjected to filter pressing is cleaned. The method is mainly applicable to restoration of soil contaminated by the heavy metal such as Cd, Cu and Pb, and is simple, easy to implement, short in cycle and remarkable in treating effect; and besides, the solution is easy to recycle and reuse, so that cost is low.
Description
Technical field
The invention belongs to the technical field of soil remediation of heavy metal pollution, is specifically related to a kind of heavy metal contaminated soil
Restorative procedure.The method is mainly used in the soil remediation to Cd, Cu, Pb heavy metal pollution.
Background technology
Soil is human being's production, the valuable source of life.With Development of China's Urbanization and industrialized production, soil pollution is asked
Topic is also increasingly severe, and the attention of relevant departments is also obtained gradually.And heavy metal pollution be then current soil pollution area it is most wide,
One of harm aspect the most serious；The wherein heavy metal pollution such as heavy metal Cd, Cu, Pb is the most universal.Heavy metal not only can draw
Play the decline of soil degradation, crop and yield, it is often more important that heavy metal eventually enters human body and the product in human body
It is tired, and then be detrimental to health.On the Chinese side, data display, polluted enterprises land used, Industrial Wasteland, industrial park with
And the content of beary metal exceeding standard rate of the representative region such as minery just alreadys exceed 30% in 2014.
Soil remediation method has phytoremediation, microorganism remediation and Agro-ecology reparation etc., but these restorative procedures are universal
Exist and administer the shortcomings of time cycle is long, and effect is not notable.And leaching repairing method, then with improvement cycle is short and regulation effect
Significant advantage, but its cost is higher.Especially for heavy metal pollutions such as Cd, Cu, Pb, select to administer cycle is short, administer
Effect is significant and the suitable soil remediation method of cost, are a problems for needing to solve at present.
The content of the invention
The present invention is directed to the deficiencies in the prior art, there is provided a kind of restorative procedure of heavy metal contaminated soil.The method master
The soil remediation to Cd, Cu, Pb heavy metal pollution is applied to, it is not only simple to operation, cycle is short regulation effect is notable；And
It is with low cost and solution is easily recycled and recycles.
In order to achieve the above object, the restorative procedure of a kind of heavy metal contaminated soil of the invention, mainly including following step
Suddenly：
The first step, crushes to pending soil, to sieve；
Second step, is sieved using screening plant to the soil being broken, to allow the soil for meeting aperture to leave reparation
Process, and the soil for not meeting aperture then can be sieved after reprocessing；
3rd step, configures IDS eluents, and the concentration of the IDS eluents is between 7mmol/L～11mmol/L；
4th step, drip washing is carried out using IDS eluents to the soil for screening out；
5th step, press filtration separates the soil after drip washing and waste liquid；
6th step, recycles the IDS eluents in the waste liquid after separation, and also the soil after press filtration is carried out clearly
Wash.Can also be to the eluent in the soil waste liquid after clean water, again press filtration is reclaimed in the step.And for IDS drip washing
The recovery of agent, by IDS eluent reuses by can waiting after heavy metal sedimentation.
Preferably, the aperture of screening plant is 6mm in the second step.
Preferably, the concentration of IDS eluents is 10mmol/L in the 3rd step.The concentration of IDS eluents is
During 7.5mmol/L, with the increase of its concentration, the drip washing effect increase in the 4th step is slower；But in the dense of IDS eluents
In the case of spending for 10mmol/L, drip washing best results.
Preferably, IDS eluents carry out drip washing under conditions of pH value is for acidity to soil in the 4th step.IDS drenches
Lotion carries out drip washing effect ratio effect in the case of neutral or alkalescence to soil under conditions of pH value is for acidity and becomes apparent from.
Preferably, in the 4th step liquid and the proportion of solid are between 30: 1～50: 1.
Used as the further improvement of such scheme, the liquid is 40: 1 with the proportion of solid.The liquid and solid
When proportion, i.e. solid-to-liquid ratio are 40: 1, drip washing best results.
Preferably, drip washing temperature environment is room temperature in the 4th step.
Preferably, in the 4th step drip washing time between 1h～3h.Can be according to actual conditions on scavenging period
Wash number suitably make the adjustment of each scavenging period.
Preferably, to the method that IDS eluents are recycled it is to adopt Na in the 6th step2The method of S precipitations.
IDS, i.e. " iminodisuccinic acid (Iminodisuccinic acid) ", are a kind of new amino acidic group chelatings
Agent, there is very strong sequestering power and good dissolubility to transition metal ions.IDS molecular formula are C8H11O8N.It has mainly with
Lower advantage：(1) IDS has stronger sequestering power to the heavy metal cation in soil；(2) IDS is in wash-out heavy metal pollution
Soil acidification is not resulted in during thing；(3) IDS degradabilities are preferable.
The contaminated soil repairing effects such as IDS eluent heavy metals Cd, Cu, Pb and Ni in the present invention are substantially better than it
His eluent.Acid of the IDS to Cu is extracted, the removal effect of reducible state is splendid.In the application present invention, can be according to unexpected dirt
The actual conditions comprehensive selection restorative procedure of dye.And when being compared to IDS eluent recovering effects, can be washed using calculating
The number of the removal amount of heavy metal is expressing recovering effect in de- liquid.
Under requiring supplementation with explanation, IDS eluents are substantially better than oxalic acid and lemon to the drip washing effect of tri- kinds of metals of Cd, Cu, Pb
Lemon acid.Na2The method of S precipitations effectively heavy metal Cd, Cu, Pb can be removed, and the bar in PH more than or equal to 9
The little removal effect of part can be more preferable.Na2S: IDS is that under conditions of 4: 1, the removal effect of three kinds of metals is substantially better than 1: 1 condition.
Na2The removal effect of S mother liquid concentration heavy metals affects little, therefore can be used according to actual conditions in actual place high
Concentration Na2S mother liquors settling the heavy metal of leacheate, to reduce the usage amount of clear water.
Soil remediation method of the present invention is mainly used in the soil remediation to Cd, Cu, Pb heavy metal pollution, and it is not only simple
Easy to operate, cycle is short regulation effect is notable；It is with low cost and solution is easily recycled and recycles.
Description of the drawings
Fig. 1 is the soil remediation schematic flow sheet of the present invention.
Specific embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited
In this.
With reference to Fig. 1, the heavy metal component of the contaminated soil in the embodiment of the present invention is mainly Cd, Cu, Pb, using the present invention
" a kind of restorative procedure of heavy metal contaminated soil " is repaired to the contaminated soil, is mainly included the following steps that：
The first step, crushes to pending soil, to sieve；
Second step, is sieved for the screening plant of 6mm using aperture to the soil being broken, to allow the soil that meets aperture
Earth leaves repair process, and the soil for not meeting aperture then can be sieved after reprocessing；
3rd step, configures IDS eluents, and the concentration of the IDS eluents is 10mmol/L；
4th step, under room temperature environment, the proportion of liquid and solid is 40: 1, using IDS eluents to the soil that screens out
Earth carries out drip washing, and drip washing number of times is each 1h (i.e. 1 hour) twice；
5th step, press filtration separates the soil after drip washing and waste liquid；
6th step, recycles the IDS eluents in the waste liquid after separation, and also the soil after press filtration is carried out clearly
Wash.Can also be to the eluent in the soil waste liquid after clean water, again press filtration is reclaimed in the step.And for IDS drip washing
The recovery of agent, by IDS eluent reuses by can waiting after heavy metal sedimentation.
IDS eluents carry out drip washing under conditions of pH value is for acidity to soil in 4th step.In 6th step
It is to adopt Na to the method that IDS eluents are recycled2The method of S precipitations.
IDS, i.e. " iminodisuccinic acid (Iminodisuccinic acid) ", are a kind of new amino acidic group chelatings
Agent, there is very strong sequestering power and good dissolubility to transition metal ions.IDS molecular formula are C8H11O8N.It has mainly with
Lower advantage：(1) IDS has stronger sequestering power to the heavy metal cation in soil；(2) IDS is in wash-out heavy metal pollution
Soil acidification is not resulted in during thing；(3) IDS degradabilities are preferable.
The contaminated soil repairing effects such as IDS eluent heavy metals Cd, Cu, Pb in the present invention are substantially better than other pouring
Lotion.Acid of the IDS to Cu is extracted, the removal effect of reducible state is splendid.In the application present invention, can be according to unexpected pollution
Actual conditions comprehensive selection restorative procedure.And when being compared to IDS eluent recovering effects, can be using calculating eluent
The number of the removal amount of middle heavy metal is expressing recovering effect.
Under requiring supplementation with explanation, IDS eluents are substantially better than oxalic acid and lemon to the drip washing effect of tri- kinds of metals of Cd, Cu, Pb
Lemon acid.Na2The method of S precipitations effectively heavy metal Cd, Cu, Pb can be removed, and the bar in PH more than or equal to 9
The little removal effect of part can be more preferable.Na2S: IDS is that under conditions of 4: 1, the removal effect of three kinds of metals is substantially better than 1: 1 condition.
Na2The removal effect of S mother liquid concentration heavy metals affects little, therefore can be used according to actual conditions in actual place high
Concentration Na2S mother liquors settling the heavy metal of leacheate, to reduce the usage amount of clear water.
The soil remediation method of the embodiment of the present invention is applied to the soil remediation to Cd, Cu, Pb heavy metal pollution；It is not only
Simple to operation, cycle is short regulation effect is notable；It is with low cost and solution is easily recycled and recycles.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention not by above-described embodiment
Limit, other any Spirit Essences without departing from the present invention and the change, modification, replacement made under principle, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (9)
1. a kind of restorative procedure of heavy metal contaminated soil, it is characterised in that mainly include the following steps that：
The first step, crushes to pending soil, to sieve；
Second step, is sieved using screening plant to the soil being broken, to allow the soil for meeting aperture to leave repair process；
3rd step, configures IDS eluents, and the concentration of the IDS eluents is between 7mmol/L～11mmol/L；
4th step, drip washing is carried out using IDS eluents to the soil for screening out；
5th step, press filtration separates the soil after drip washing and waste liquid；
6th step, recycles the IDS eluents in the waste liquid after separation, and also the soil after press filtration is cleaned.
2. a kind of restorative procedure of heavy metal contaminated soil according to claim 1, it is characterised in that the second step
The aperture of middle screening plant is 6mm.
3. a kind of restorative procedure of heavy metal contaminated soil according to claim 1, it is characterised in that the 3rd step
The concentration of middle IDS eluents is 10mmol/L.
4. a kind of restorative procedure of heavy metal contaminated soil according to claim 1, it is characterised in that the 4th step
Middle IDS eluents carry out drip washing under conditions of pH value is for acidity to soil.
5. a kind of restorative procedure of heavy metal contaminated soil according to claim 1, it is characterised in that the 4th step
In liquid and solid proportion between 30: 1～50: 1.
6. the restorative procedure of a kind of heavy metal contaminated soil according to claim 5, it is characterised in that the liquid with
The proportion of solid is 40: 1.
7. a kind of restorative procedure of heavy metal contaminated soil according to claim 1, it is characterised in that the 4th step
Middle drip washing temperature environment is room temperature.
8. a kind of restorative procedure of heavy metal contaminated soil according to claim 1, it is characterised in that the 4th step
The middle drip washing time is between 1h～3h.
9. a kind of restorative procedure of heavy metal contaminated soil according to claim 1, it is characterised in that the 6th step
In to the method that IDS eluents are recycled be to adopt Na2The method of S precipitations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611149173.5A CN106623381A (en) | 2016-12-06 | 2016-12-06 | Restoration method of heavy metal contaminated soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611149173.5A CN106623381A (en) | 2016-12-06 | 2016-12-06 | Restoration method of heavy metal contaminated soil |
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| Publication Number | Publication Date |
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| CN106623381A true CN106623381A (en) | 2017-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611149173.5A Pending CN106623381A (en) | 2016-12-06 | 2016-12-06 | Restoration method of heavy metal contaminated soil |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107185952A (en) * | 2017-05-27 | 2017-09-22 | 北京至清时光环保工程技术有限公司 | The administering method of soil pollution by heavy metal |
| CN107774706A (en) * | 2017-11-16 | 2018-03-09 | 安徽金联地矿科技有限公司 | A kind of mining soil prosthetic device and its restorative procedure based on chemical leaching |
| CN110420988A (en) * | 2019-08-09 | 2019-11-08 | 姚爽 | One heavy metal species soil remediation method |
| CN110560475A (en) * | 2019-09-16 | 2019-12-13 | 上海中新国源环保集团股份有限公司 | stabilization restoration method for heavy metal contaminated soil |
-
2016
- 2016-12-06 CN CN201611149173.5A patent/CN106623381A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 孙礼奇: "IDS对重金属污染土壤淋洗修复研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107185952A (en) * | 2017-05-27 | 2017-09-22 | 北京至清时光环保工程技术有限公司 | The administering method of soil pollution by heavy metal |
| CN107774706A (en) * | 2017-11-16 | 2018-03-09 | 安徽金联地矿科技有限公司 | A kind of mining soil prosthetic device and its restorative procedure based on chemical leaching |
| CN110420988A (en) * | 2019-08-09 | 2019-11-08 | 姚爽 | One heavy metal species soil remediation method |
| CN110560475A (en) * | 2019-09-16 | 2019-12-13 | 上海中新国源环保集团股份有限公司 | stabilization restoration method for heavy metal contaminated soil |
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Application publication date: 20170510 |