CN103736723A - Integrated repair method of heavy metal polluted soil and underground water - Google Patents
Integrated repair method of heavy metal polluted soil and underground water Download PDFInfo
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- CN103736723A CN103736723A CN201310278001.8A CN201310278001A CN103736723A CN 103736723 A CN103736723 A CN 103736723A CN 201310278001 A CN201310278001 A CN 201310278001A CN 103736723 A CN103736723 A CN 103736723A
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Abstract
The invention relates to an integrated repair method of heavy metal polluted soil and underground water. The invention concretely comprises the following steps: applying a heavy metal stabilizing agent into a polluted soil in proportion, simultaneously pumping polluted underground water, uniformly sprinkling or pouring the underground water on the polluted soil with applied stabilizing agent, and heavy metals in the underground water are retained by soil and the heavy metals together with original heavy metals in soil are reacted with the stabilizing agent, and adsorption, deposition, ion exchange or the like are generated, thereby the heavy metals are stabilized, and the repaired underground water returns to underground by seepage, and the polluted soil and the underground water are simultaneously repaired. Compared with the traditional separated repair method of soil and underground water, the method provided by the invention can repair heavy metals in polluted underground water and soil simultaneously in a simple system, thereby realizing integrated repair purpose. The invention has the characteristics of simple treatment process, low cost, etc.
Description
Technical field
The invention belongs to field of environment engineering technology, be specifically related to the integrated restorative procedure of a kind of heavy-metal contaminated soil and underground water.
Background technology
In recent years, due to the pollution of industrial and agricultural production and the continuous increase of strength of human activities, chemical fertilizer, agricultural chemicals uses in a large number, the leakage of petroleum chemicals and fault discharge, the noxious material that poisonous, harmful solid waste landfill causes leaks, and all causes soil pollution enlarged areas, and pollution level is deepened.And soil and groundwater exists contact closely, contaminated soil easily causes down and covers underground water and also produce pollution, need to process contaminated soil and underground water, but, at present soil and groundwater pollutes that to repair be all to repair separately respectively substantially, if contaminated soil and underground water are integrated in a technique and are processed, can simplify treatment process, save disposal cost, save land resource.Therefore, soil and the integrated reparation of underground water are more and more caused to people's concern.At present, domestic also less than the patent about the integrated recovery technique of soil underground water.
Summary of the invention
The object of the invention is to provides a kind of heavy-metal contaminated soil and the integrated restorative procedure of underground water for soil and groundwater heavy metal pollution problem.Be specially soil chemistry stabilization method and underground water extraction facture are combined, in contaminated soil, add heavy metal stabilization agent, polluted underground water is extracted out by pump, leaching is to adding in the contaminated soil of heavy metal stabilization agent, make the effects such as heavy metal in stabilization agent and contaminated soil and underground water precipitates, absorption, thereby change the form of heavy metal, heavy metal is stablized, and the processing such as the adsorption by soil of polluted underground water process interpolation stabilization agent, precipitation, under freedom, ooze, again recharge groundwater.
The object of the invention is to be achieved through the following technical solutions:
The present invention relates to the integrated restorative procedure of a kind of heavy-metal contaminated soil and underground water, comprise the steps:
A, heavy metal stabilization agent is applied in contaminated soil;
B, polluted underground water is extracted out, sprayed or water described in being filled in and apply in the contaminated soil of heavy metal stabilization agent; Heavy metal in described polluted underground water is held back by soil and is had an effect with heavy metal stabilization agent together with original heavy metal in soil, and heavy metal is stablized;
C, described heavy metal be trapped and stablize after underground water return and permeate the ground, complete described heavy metal soil and the integrated reparation of underground water.
Preferably, in steps A, the selection of described heavy metal stabilization agent is specially: the contaminated soil in contaminated site and polluted underground water investigation, sampling, analysis are monitored, determine the kind of heavy metal contaminants in contaminated soil and polluted underground water, the volume of pollution distribution, pollution level and polluted underground water; According to the character of the kind of described heavy metal contaminants, pollution distribution, pollution level and contaminated soil, determine selecting of heavy metal stabilization agent material.
Preferably, in steps A, definite being specially of described heavy metal stabilization agent consumption: the addition of determining heavy metal stabilization agent according to the concentration of heavy metal in contaminated soil and polluted underground water and the volume of polluted underground water.
Preferably, in steps A, described heavy metal stabilization agent is phosphorated material.
Preferably, described phosphorated material comprises apatite, double superhosphate.
Preferably, described phosphorated material is be 1: 1 containing P ratio apatite and the mixture of double superhosphate.
Preferably, in described heavy metal stabilization agent, the mol ratio of P element and heavy metal is (2～4): 1.
Preferably, in step B, described by polluted underground water extract out be specially: in the place at described contaminated soil place, beat groundwater sampling well; Polluted underground water is extracted out from sampled well.
Preferably, in step B, described heavy metal and heavy metal stabilization agent occur act as one or more in absorption, precipitation, ion-exchange.
Heavy-metal contaminated soil of the present invention and the integrated restorative procedure of underground water are to extract chemically stable method and underground water out facture to be combined the integrated restorative procedure forming.The principle of the fixing heavy metal of this integrated restorative procedure is: the heavy metal in soil and underground water all by with soil in the heavy metal stabilization agent added adsorb, the effect such as precipitation, ion-exchange, heavy metal in underground water is removed, and heavy metal in soil is stablized.Concrete fixed mechanism is as follows:
In apatite and double superhosphate stable soil and underground water, the mechanism of heavy metal is mainly absorption, precipitation or co-precipitation, adsorption or the complexing mechanism based on phosphate radical functional group, and reaction equation is summarized as follows:
5M
2++ 3H
2pO
4 -+ Cl
-=M
5(PO
4)
3cl+6H
+(M represents that heavy metal is as Pb, Cd etc.) (1.1)
≡ POH+M
2+=≡ POM
++ H
+(≡ POH represents apatite surface) (1.2)
≡ S-HPO
4 2-+ M
2+=≡ S-HPO
4 2--M
2+(≡ S represents soil oxide surface) (1.3)
Compared with prior art, the present invention has following beneficial effect:
1, realized the repair simultaneously of heavy-metal contaminated soil and underground water;
2, simplify difference treatment process, reduction disposal cost, the saving soil resource of heavy-metal contaminated soil and polluted underground water.
Accompanying drawing explanation
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is the flow chart of heavy-metal contaminated soil of the present invention and the integrated restorative procedure of underground water.
The specific embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
The flow chart of heavy-metal contaminated soil of the present invention and the integrated restorative procedure of underground water as shown in Figure 1, first to contaminated site carry out contaminated soil, polluted underground water investigation, sampling plan is set, the result of carrying out the sampling of contaminated soil and underground water, monitoring according to analysis, determines the kind of place heavy metal contaminants, the volume of pollution distribution, pollution level and polluted underground water; Then according to the kind of heavy metal contaminants, pollution level, soil property, determine heavy metal stabilization agent, as pollutions such as Pb, Cu, Zn, can select apatite, double superhosphate etc.; According to the concentration of heavy metal in soil and groundwater and area (volume), set repair materials addition.General phosphorated material addition (P content) is (2～4) with the molar concentration ratio of heavy metal pollution amount: 1, heavy metal stabilization agent is evenly mixed with pollution soil layer; Then, polluted underground water is extracted out from extraction well with pump, evenly be sprayed at contaminated site, make under freedom, to ooze in the soil of polluted underground water after reparation, utilize the mechanism such as the absorption, filtration, precipitation of stabilized metal agent in soil, remove heavy metal in underground water, simultaneously by the heavy metal in underground water together with original heavy metal in soil stabilized dose be fixed in soil, the underground water after being repaired returns and permeates the ground.Following embodiment is shown in concrete application:
embodiment 1
Certain dirty irrigated area Cd contaminated soil (containing 60mg/kg Cd), polluted underground water concentration is 10mg/L Pb, 0.3mg/LCd, 10mg/L Zn, heavy metal-polluted soil stabilisation repair materials is for containing apatite and the double superhosphate mixture that P ratio is 1: 1, addition is that the mol ratio of phosphorus and heavy metal is 2: 1, and groundwater abstraction evenly waters and is filled in the contaminated soil that applies phosphorated material.Through the reparation of 40 days, integrated processing system coprocessing polluted underground water amount was 673L/Kg.After leaching finishes, soil is held back the amount of Pb in polluted underground water up to being 9915mg/Kg, and in underground water, Pb clearance reaches 91%; The amount that soil is held back Cd in polluted underground water is 143mg/Kg, and Cd clearance is 40.2%; The amount that soil is held back Zn in polluted underground water is 3477mg/Kg, and Zn clearance is 45.2%.Finish to leaching, integrated processing system reaches capacity not yet to the adsorption capacity of Pb, still has and continues to hold back the ability of removing Pb in underground water, but the adsorbance of Cd and Zn is reached capacity.CaCl in soil
2extract state Pb compared with the control with TCLP, declined respectively 60.5% and 62.8%; CaCl
2extract state Cd compared with the control, soil CaCl with TCLP
2extract state Cd and declined 12.3%, but TCLP extracts, state Cd is substantially constant to be worked as; CaCl
2extract state Zn compared with the control with TCLP, declined respectively 7.5% and 10.2%.To sum up, in the soil of phosphorated material induction, underground water, the integrated reparation of heavy metal can realize the removal of heavy metal in polluted underground water and fixing of Heavy Metals in Contaminated Soils simultaneously, and especially the successful to Pb and fixed capacity are larger.
embodiment 2
Near contaminated soil (2850mg/kg Pb, 31mg/kg Cd, 975mg/kg Zn) certain smeltery, polluted underground water concentration is 10mg/L Pb, 0.3mg/L Cd, 10mg/L Zn, heavy metal-polluted soil stabilisation repair materials is for containing phosphorus ore tailing and the double superhosphate mixture that P ratio is 1: 1, addition is that the mol ratio of phosphorus and heavy metal is about 4: 1, and groundwater abstraction evenly waters and is filled in the contaminated soil that has applied phosphorated material.Through the integrated reparation of 120 days, coprocessing polluted underground water amount was 605.5L/Kg.After leaching finishes, soil is held back the amount of Pb in polluted underground water up to being 14504mg/Kg, and in underground water, Pb clearance reaches 87.6%; The amount that soil is held back Cd in polluted underground water is 64.6mg/Kg, and Cd clearance is 30.0%; Zn in underground water is not removed to effect substantially.Finish to leaching, integrated processing system reaches capacity not yet to the adsorption capacity of Pb, still has and continues to be detained the ability of removing Pb in underground water, but the adsorbance of Cd and Zn is reached capacity.CaCl in soil
2extract state Pb concentration lower than Flame Atomic Absorption Spectrometry detectability, TCLP extracts state Pb compared with the control, declines 51.0%; CaCl
2extract state Cd compared with the control with TCLP, declined respectively 41.7% and 31.9%; CaCl
2extract state Zn compared with the control with TCLP, decline respectively 3.2% and 19%.To sum up, in the soil of phosphorated material induction, underground water, the integrated reparation of heavy metal can realize the removal of heavy metal in polluted underground water and fixing of Heavy Metals in Contaminated Soils simultaneously, and especially the successful to Pb and fixed capacity are larger, but less to Zn effect.
embodiment 3
Certain dirty Irrigated Area Soils is containing 86.6mg/kg Cu, 175.8mg/kg Zn, 3.48mg/kg Cd, 94.2mg/kg Cr, 22.9mg/kg Pb, and underground water is containing 5.66 μ g/L Cu, 559.2 μ g/L Zn, 0.48 μ g/L Cd, 9.18 μ g/L Cr, Pb5.17 μ g/L.Heavy metal-polluted soil stabilisation repair materials is for containing apatite and the double superhosphate mixture that P ratio is 1: 1, addition is that the mol ratio of phosphorus and heavy metal is about 3: 1, groundwater abstraction evenly waters and is filled in the contaminated soil that has applied phosphorated material, and on contaminated soil, plants Chinese cabbage.Through the integrated reparation of 90 days, Chinese cabbage content of beary metal obviously declined, and Cu decline 10.2%, Cr decline 29.4%, Cd decline 21.6%, Pb declines 50.9%; Underground water heavy metal Cu decline 34.7%, Cd decline 80%, Pb declines 20%.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (9)
1. the integrated restorative procedure of heavy-metal contaminated soil and underground water, is characterized in that, comprises the steps:
A, heavy metal stabilization agent is applied in contaminated soil;
B, polluted underground water is extracted out, sprayed or water described in being filled in and apply in the contaminated soil of heavy metal stabilization agent; Heavy metal in described polluted underground water is held back by soil and is had an effect with heavy metal stabilization agent together with original heavy metal in soil, and heavy metal is stablized;
C, described heavy metal be trapped and stablize after underground water return and permeate the ground, complete the integrated reparation of described heavy-metal contaminated soil and underground water.
2. the integrated restorative procedure of heavy-metal contaminated soil according to claim 1 and underground water, it is characterized in that, in steps A, the selection of described heavy metal stabilization agent is specially: the contaminated soil in contaminated site and polluted underground water investigation, sampling, analysis are monitored, determine the kind of heavy metal contaminants in contaminated soil and polluted underground water, the volume of pollution distribution, pollution level and polluted underground water; According to the character of the kind of described heavy metal contaminants, pollution distribution, pollution level and contaminated soil, determine selecting of heavy metal stabilization agent material.
3. the integrated restorative procedure of heavy-metal contaminated soil according to claim 1 and underground water, it is characterized in that, in steps A, definite being specially of described heavy metal stabilization agent consumption: the addition of determining heavy metal stabilization agent according to the concentration of heavy metal in contaminated soil and polluted underground water and the volume of polluted underground water.
4. the integrated restorative procedure of heavy-metal contaminated soil according to claim 1 and underground water, is characterized in that, in steps A, described heavy metal stabilization agent is phosphorated material.
5. the integrated restorative procedure of heavy-metal contaminated soil according to claim 4 and underground water, is characterized in that, described phosphorated material comprises apatite, double superhosphate.
6. the integrated restorative procedure of heavy-metal contaminated soil according to claim 5 and underground water, is characterized in that, the apatite that described phosphorated material is is 1: 1 containing P ratio and the mixture of double superhosphate.
7. according to the heavy-metal contaminated soil described in claim 4,5 or 6 and the integrated restorative procedure of underground water, it is characterized in that, in described heavy metal stabilization agent, the mol ratio of P element and heavy metal is (2～4): 1.
8. the integrated restorative procedure of heavy-metal contaminated soil according to claim 1 and underground water, is characterized in that, in step B, described by polluted underground water extract out be specially: in the place at described contaminated soil place, beat groundwater sampling well; Polluted underground water is extracted out from sampled well.
9. the integrated restorative procedure of heavy-metal contaminated soil according to claim 1 and underground water, is characterized in that, in step B, described heavy metal and heavy metal stabilization agent occur act as one or more in absorption, precipitation, ion-exchange.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104043646A (en) * | 2014-06-24 | 2014-09-17 | 齐绍武 | Method for separating harmful heavy metals in paddy field |
| CN106126694A (en) * | 2016-06-30 | 2016-11-16 | 中国科学院烟台海岸带研究所 | The support of a kind of impurely Rehabilitation decision and the construction method of online evaluation platform |
| CN108393345A (en) * | 2018-03-09 | 2018-08-14 | 江苏索尔雷米环保科技有限公司 | A kind of integrated restorative procedure being used for contaminated soil and underground water |
| CN111451258A (en) * | 2020-04-27 | 2020-07-28 | 浙江省环境工程有限公司 | Pollute soil-groundwater integration repair system |
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| CN101829673A (en) * | 2009-03-09 | 2010-09-15 | 江西金达莱环保研发中心有限公司 | Soil remediation method |
| CN102335674A (en) * | 2010-07-27 | 2012-02-01 | 周静 | Method for restoring soil polluted by heavy metals Cu and Cd in apatite field |
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Patent Citations (4)
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| CN101829673A (en) * | 2009-03-09 | 2010-09-15 | 江西金达莱环保研发中心有限公司 | Soil remediation method |
| CN101664757A (en) * | 2009-09-29 | 2010-03-10 | 农业部环境保护科研监测所 | Method for restoring heavy metal pollution of vegetable field soil with in-situ passivation method |
| CN101698521A (en) * | 2009-11-17 | 2010-04-28 | 重庆大学 | Method for electrically restoring soil and underground water |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104043646A (en) * | 2014-06-24 | 2014-09-17 | 齐绍武 | Method for separating harmful heavy metals in paddy field |
| CN106126694A (en) * | 2016-06-30 | 2016-11-16 | 中国科学院烟台海岸带研究所 | The support of a kind of impurely Rehabilitation decision and the construction method of online evaluation platform |
| CN108393345A (en) * | 2018-03-09 | 2018-08-14 | 江苏索尔雷米环保科技有限公司 | A kind of integrated restorative procedure being used for contaminated soil and underground water |
| CN111451258A (en) * | 2020-04-27 | 2020-07-28 | 浙江省环境工程有限公司 | Pollute soil-groundwater integration repair system |
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Effective date of registration: 20190426 Address after: Room 803, Building 1, 100 Qinzhou Road, Xuhui District, Shanghai, 200235 Patentee after: Shanghai Shenglong Environment Remediation Technologies Co., Ltd. Address before: Room 602, No. 69, 811 Lane, Dongchuan Road, Minhang District, Shanghai, 200240 Co-patentee before: Shanghai Shenglong Environment Remediation Technologies Co., Ltd. Patentee before: Cao Xinde |
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Address after: Room 803, Building 1, 100 Qinzhou Road, Xuhui District, Shanghai, 200235 Patentee after: Sinochem environmental remediation (Shanghai) Co.,Ltd. Address before: Room 803, Building 1, 100 Qinzhou Road, Xuhui District, Shanghai, 200235 Patentee before: SHANGHAI SHENGLONG ENVIRONMENT REMEDIATION TECHNOLOGIES Co.,Ltd. |
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