CN1382535A - Method and equipment for washing soil polluted by water-soluble or exchangeable heavy metals - Google Patents
Method and equipment for washing soil polluted by water-soluble or exchangeable heavy metals Download PDFInfo
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- CN1382535A CN1382535A CN 01113882 CN01113882A CN1382535A CN 1382535 A CN1382535 A CN 1382535A CN 01113882 CN01113882 CN 01113882 CN 01113882 A CN01113882 A CN 01113882A CN 1382535 A CN1382535 A CN 1382535A
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Abstract
A process for washing the water-soluble exchanging heavy metal polluted soil includes spreading quartz sand layers (1.5-2.5 cm in thickness on the bottoms of upper, middle and lower washing columns, filling said polluted soil in them, spreading quartz sand layer on the soil, washing with washing liquid, removing sand and suspended substance from the washed liquid by pump and filter, ion exchange in ion exchange column for removing heavy metal, and pumping it back to said washing column. Its advantages are simple structure and no secondary pollution.
Description
The present invention relates to the soil cleaning technique, specifically a kind of cleaning method and special equipment thereof of water-soluble attitude exchange state heavy-metal contaminated soil.
The soil cleaning technique is meant the method for utilizing the physical-chemical principle to remove pollutant in soil, mainly be to adopt the pot type device to hold heavy-metal contaminated soil at present, add entry or pouring (clearly) lotion, clean, again soil and the cleaning fluid that contains heavy metal are separated, be used widely abroad, yet because of containing a large amount of heavy metals in pouring (clearly) washing lotion that is produced, the method faces issuable secondary pollution problem, apparatus expensive in addition, energy consumption is big, has limited to the application of soil cleaning technique.
The purpose of this invention is to provide a kind of non-secondary pollution, simple in structure, water-soluble attitude exchange state heavy-metal contaminated soil cleaning method and isolated plant thereof that cost is low.
To achieve these goals, technical scheme of the present invention is to adopt cleaning, filtration, ion-exchange and reclaim integrated mode, is specially:
1) clean: every grade in the three grades of cleaning posts in upper, middle and lower is cleaned the thick quartz sand of column bottom place mat 1.5～2.5cm, by volume on average dose heavy-metal contaminated soil in three grades of cleaning posts respectively, above heavy-metal contaminated soil, overlay the thick quartz sand of 0.8～1.2cm again, from going up most the amount adding cleaning fluid of cleaning post, clean then with 1～5 times of soil weight;
2) filter: enter sandfiltration pot with the cleaning fluid after the described cleaning through pump and carry out sand filtration, remove suspension;
3) ion-exchange and recovery: the described cleaning fluid that contains heavy metal after cleaning, filtering is entered ion exchange column through pump carry out ion-exchange, remove heavy metal; Cleaning fluid after the ion-exchange is delivered in three grades of cleaning posts through blowback, continues to clean;
Cleaning fluid adopts water, complexing agent edta edta or magnesium chloride Mg Cl
2Solution;
The isolated plant of described water-soluble attitude exchange state heavy-metal contaminated soil cleaning method is made up of three grades of cleaning posts, sandfiltration pot, ion exchange column and pumps, wherein: three grades of cleaning posts are polychloroethylene pipes, upper, middle and lower are installed together for three grades, pipeline communicates, subordinate cleans post and links to each other with sandfiltration pot through pump, described sandfiltration pot bottom connects ion exchange column through pump, and described ion exchange column output liquid flow to the cleaning post through blowback;
Described sandfiltration pot bottom adds a back purge system, and top is provided with the backwash floss hole; Described last, intermediate cleaning post links to each other with sub-pump; Described ion exchange column delivery outlet is established a floss hole.
The present invention has following advantage:
1. the inventive method adopts cleaning, filtration, ion-exchange to reclaim integral process, can remove most of water-soluble attitude and exchange state heavy metal in the contaminated soil, simultaneously, cleaning fluid is through after the ion-exchange, heavy metal contaminants is concentrated by ion exchange resin, can recycle, avoid secondary pollution.
2. isolated plant of the present invention is simple in structure, practical, and energy consumption is low, cost is low, and cleaning fluid can reflux and repeatedly reuse.
Fig. 1 is an isolated plant structural representation of the present invention.
Below in conjunction with drawings and Examples the present invention is further elaborated.
Embodiment 1
The cleaning method of water-soluble attitude, exchange state heavy-metal contaminated soil adopts cleaning, filtration, ion-exchange and reclaims integrated mode, is specially:
Clean: the thick quartz sand of every grade of cleaning post 1 bottom place mat 2cm in the three grades of cleaning posts 1 in upper, middle and lower, heavy-metal contaminated soil is by volume on average dosed 1 li on three grades of cleaning posts respectively, above heavy-metal contaminated soil, overlay the thick quartz sand of 1cm again, from going up most the amount adding cleaning fluid of cleaning post 1, clean then with 1.06 times of soil weights; Cleaning fluid adopts 1M MgCl
2Solution;
Filter: enter sandfiltration pot 3 with the cleaning fluid after the described cleaning through pump 2 and carry out sand filtration, remove suspension;
Ion-exchange and recovery: the described cleaning fluid that contains heavy metal after cleaning, filtering is entered ion exchange column 4 through pump 2 carry out ion-exchange, remove heavy metal; Cleaning fluid after ion-exchange is transmitted back to 1 li on three grades of cleaning posts through pump 2, continues to clean.
The inventive method isolated plant is made up of three grades of cleaning posts 1, sandfiltration pot 3, ion exchange column 4 and pump 2, wherein: three grades of cleaning posts 1 are polychloroethylene pipes, upper, middle and lower vertically are installed together for three grades, pipeline communicates, subordinate cleans post 1 and links to each other with sandfiltration pot 3 through pump 2, described sandfiltration pot 3 bottoms connect ion exchange column 4 through pump 2, and described ion exchange column 4 output liquid are back to through pump 2 and clean post 1; A floss hole is established in described ion exchange column 4 outputs in addition; Described sandfiltration pot 3 bottoms add a back purge system, and top is provided with the backwash floss hole;
15kg inserts three grades of cleaning posts 1 respectively with cadmium Cd contaminated soil, every grade of cleaning post 1 diameter is 1: 1～5 with the ratio of height, the present embodiment diameter is 1: 2 with the ratio of height, every grade of cleaning post 1 is dosed 5kg, Cd concentration 1.86mg/kg in the contaminated soil, wherein water-soluble attitude Cd 0.27mg/kg, exchange state Cd 0.47mg/kg is with 16L 1M MgCl
2Cleaning fluid cleans, and cleans Cd concentration 0.96mg/L in the post 1 exit cleaning fluid, Cd concentration 0.95mg/L in the cleaning fluid after sand filtration, behind ion exchange column 4, Cd concentration 0.56mg/L in the cleaning fluid reclaims cleaning fluid 9L, reclaims Cd 5.22mg from ion exchange column 4 (resin).Cd concentration is 1.10mg/kg in the soil of cleaning back, and the Cd clearance is 36%.
Be with the examples of implementation difference:
Clean: the thick quartz sand of every grade of cleaning post 1 bottom place mat 2.5cm in the three grades of cleaning posts 1 in upper, middle and lower, heavy-metal contaminated soil is by volume on average dosed 1 li on three grades of cleaning posts respectively, above heavy-metal contaminated soil, overlay the thick quartz sand of 1.2cm again, from going up most the amount adding cleaning fluid of cleaning post 1, clean then with 1.33 times of soil weights; Cleaning fluid adopts magnesium chloride Mg Cl
2Solution;
Cd contaminated soil 15kg is inserted three grades of cleaning posts 1 respectively, every grade of cleaning post 1 diameter is 1: 1～5 with the ratio of height, the present embodiment diameter is 1: 4 with the ratio of height, dose 5kg for every grade, Cd concentration 2.05mg/kg in the contaminated soil, wherein water-soluble attitude Cd 0.33mg/kg, exchange state Cd 0.59mg/kg is with 20L 1M MgCl
2Cleaning fluid cleans, and cleans Cd concentration 0.8mg/L in the post 1 exit cleaning fluid, Cd concentration 0.80mg/L in the cleaning fluid after sand filtration, behind ion exchange column 4, Cd concentration 0.42mg/L in the cleaning fluid reclaims cleaning fluid 13L, reclaims Cd 6.4mg from ion exchange column 4 (resin).Cd concentration is 1.36mg/kg in the soil of cleaning back, and the Cd clearance is 35%.
Last, intermediate cleaning post 1 of the present invention also can link to each other with pump 2; The present invention is applicable to that also other water-soluble attitude, exchange state heavy-metal contaminated soil clean, as copper, chromium, lead, zinc etc.; The present invention is available water or (the Ethylenediaminetetra-acetic acid abbreviation: EDTA) be used as cleaning fluid of complexing agent ethylenediamine tetra-acetic acid also; When needs clean, use back purge system that waste water is discharged from sandfiltration pot 3 floss holes; In case of necessity, cleaning fluid is back to cleaning post 1 without pump 2, and discharges through the floss hole of ion exchange column 4 delivery outlets after repeatedly using.
Claims (6)
1. water-soluble attitude exchange state heavy-metal contaminated soil cleaning method is characterized in that: adopt cleaning, filtration, ion-exchange and reclaim integrated mode, be specially:
1) clean: every grade in the three grades of cleaning posts in upper, middle and lower is cleaned the thick quartz sand of column bottom place mat 1.5～2.5cm, by volume on average dose heavy-metal contaminated soil in three grades of cleaning posts respectively, above heavy-metal contaminated soil, overlay the thick quartz sand of 0.8～1.2cm again, from going up most the amount adding cleaning fluid of cleaning post, clean then with 1～5 times of soil weight;
2) filter: enter sandfiltration pot with the cleaning fluid after the described cleaning through pump and carry out sand filtration, remove suspension;
3) ion-exchange and recovery: the described cleaning fluid that contains heavy metal after cleaning, filtering is entered ion exchange column through pump carry out ion-exchange, remove heavy metal; Cleaning fluid after the ion-exchange is delivered in three grades of cleaning posts through blowback, continues to clean.
2. according to the described heavy-metal contaminated soil cleaning method of claim 1, it is characterized in that: cleaning fluid adopts water, complexing agent edta edta or magnesium chloride Mg Cl
2Solution.
3. isolated plant according to the described water-soluble attitude exchange state heavy-metal contaminated soil cleaning method of claim 1, it is characterized in that: form by three grades of cleaning posts (1), sandfiltration pot (3), ion exchange column (4) and pump (2), wherein: three grades of cleaning posts (1) are polychloroethylene pipes, upper, middle and lower are installed together for three grades, pipeline communicates, subordinate cleans post (1) and links to each other with sandfiltration pot (3) through pump (2), described sandfiltration pot (3) bottom connects ion exchange column (4) through pump (2), and described ion exchange column (4) output liquid is back to through pump (2) and cleans post (1).
4. according to the isolated plant of the described water-soluble attitude exchange state heavy-metal contaminated soil cleaning method of claim 3, it is characterized in that: described sandfiltration pot (3) bottom adds a back purge system, and top is provided with the backwash floss hole.
5. according to the isolated plant of the described water-soluble attitude exchange state heavy-metal contaminated soil cleaning method of claim 3, it is characterized in that: describedly go up, middle rank cleans post (1) and link to each other with pump (2).
6. according to the isolated plant of the described water-soluble attitude exchange state heavy-metal contaminated soil cleaning method of claim 3, it is characterized in that: described ion exchange column (4) delivery outlet is established a floss hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01113882 CN1382535A (en) | 2001-04-20 | 2001-04-20 | Method and equipment for washing soil polluted by water-soluble or exchangeable heavy metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01113882 CN1382535A (en) | 2001-04-20 | 2001-04-20 | Method and equipment for washing soil polluted by water-soluble or exchangeable heavy metals |
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| CN1382535A true CN1382535A (en) | 2002-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01113882 Pending CN1382535A (en) | 2001-04-20 | 2001-04-20 | Method and equipment for washing soil polluted by water-soluble or exchangeable heavy metals |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104043644A (en) * | 2013-07-01 | 2014-09-17 | 东营金川水土环境工程有限公司 | Method for treating soil pollution by using layered circulation cleaning |
| CN108817055A (en) * | 2018-05-24 | 2018-11-16 | 湖南城市学院 | Heavy-metal contaminated soil cleaning device and method |
-
2001
- 2001-04-20 CN CN 01113882 patent/CN1382535A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104043644A (en) * | 2013-07-01 | 2014-09-17 | 东营金川水土环境工程有限公司 | Method for treating soil pollution by using layered circulation cleaning |
| CN104043644B (en) * | 2013-07-01 | 2015-09-16 | 东营金川水土环境工程有限公司 | A kind of layered circulation that utilizes cleans the method for administering soil pollution |
| CN108817055A (en) * | 2018-05-24 | 2018-11-16 | 湖南城市学院 | Heavy-metal contaminated soil cleaning device and method |
| CN108817055B (en) * | 2018-05-24 | 2019-04-09 | 湖南城市学院 | Heavy-metal contaminated soil cleaning device and method |
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