CN104841691A - Repair method of heavy metal nickel contaminated soil - Google Patents
Repair method of heavy metal nickel contaminated soil Download PDFInfo
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- CN104841691A CN104841691A CN201510213271.XA CN201510213271A CN104841691A CN 104841691 A CN104841691 A CN 104841691A CN 201510213271 A CN201510213271 A CN 201510213271A CN 104841691 A CN104841691 A CN 104841691A
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Abstract
The invention discloses a repair method of heavy metal nickel contaminated soil. The repair method includes the steps: A spraying 10% of acetate solution to the nickel contaminated soil to perform drip washing; B standing for 12h at normal temperature; C separating the drip washed soil from wastewater containing heavy metals; D removing residual nickel ions in the drip washed contaminated soil by an electric potential migration method. The mass ratio of the acetate solution to the nickel contaminated soil is 1:1. Compared with an existing multiple drip washing method and an ion migration method, the repair method has the advantages that heavy metal removing rate is high, more energy is saved, and soil fertility is less affected.
Description
Technical field
The present invention relates to environmental protection and energy saving technical field, be specifically related to a kind of method removing heavy metal pollution of soil thing.
Background technology
Heavy metal pollution of soil is more and more serious in China, current improvement heavy metal pollution of soil adopts the soil of the method such as engineering, physics and chemistry repairing heavy metal pollution, be difficult to process contaminated soil on a large scale, and the degeneration of the destruction of soil texture, bioactive decline and soil fertility can be caused, there is certain limitation, biological prosthetic is an emerging efficient repairing recovering technology, easily accept by masses, have good society, ecology synthesis benefit, but technology is still not mature enough, repairing efficiency is long, and repairing effect is bad, Agro-ecology measure is taked to there is cycle long, the inapparent feature of effect, although Soil leaching technology is applied more on improvement heavy metal pollution of soil, but adopt Soil leaching mode to need to carry out repeatedly drip washing and effectively could remove heavy metal content in soil, and repeatedly drip washing cost is very high, water requirement is very large, and the much waste water containing heavy metal can be produced, when shortage of water resources phenomenon highlights, the method had not only wasted resource not environmentally but also strengthen production cost and production process, simultaneously because repeatedly drip washing seriously can reduce soil fertility, if but reducing drip washing number of times can affect heavy metals removal effect again greatly, do not reach standard-required, and ion electric potential migration recovery technique is the technology that new development is got up, but this technology is high for porosity of soil, when moisture content is high, repairing effect is better, but be directly applied in poor effect on the low soil of porosity, poor to the heavy metals removal effect organically combining state and residual form.Therefore, a technology is not also had can well to solve heavy metal pollution of soil problem up to now.Therefore, need in a hurry a kind of simple, effectively and the administering method of economy processes heavy-metal contaminated soil.
Summary of the invention
Task of the present invention exists problem for prior art, provide that a kind of repairing effect is good, environmental protection and energy saving, economical and practical heavy metal nickel contaminated soil restorative procedure.
Technological means: the restorative procedure that the invention discloses a kind of heavy metal nickel contaminated soil, this restorative procedure comprises following concrete steps:
1) by mass fraction be 10% acetum spray on nickel contamination soil and carry out drip washing, the mass ratio of acetum and nickel contamination soil is 1:1;
2) at normal temperatures, 12h is left standstill;
3) soil after drip washing is separated with the waste water containing heavy metal;
4) heavy metal nickel contaminated soil after drip washing is positioned over fills in the electrolytic cell of water, the two ends of electrolytic cell are provided with anode chamber and cathode chamber, anode chamber, cathode chamber respectively with drip washing after soil separate with the plastic wire that placed amberplex, all deionized water is contained with in anode chamber and cathode chamber, deionized water pH value in anode chamber is 3, deionized water pH value in cathode chamber is 7, by graphite electrode to applying the direct current that voltage gradient is 2V/cm between cathode chamber and anode chamber, under electromotive force effect, remaining heavy metal ion is to movable cathode, enter cathode chamber to reclaim.
Wherein, the heavy metal nickel contaminated soil of this method process is the clay of nickel concentration >=200mg/kg.
Before step 1), first to carrying out fragmentation, screening removal bulk solid foreign material containing heavy metal nickel contaminated soil.
In step 3), the waste water after separation is again done drip washing and uses after being reclaimed by nickel by electrolysis or precipitation method purified treatment.
In step 4), the pH value of target room and anode chamber regulates, and comprising: when the pH value of anode chamber drops to below 3, is adjusted near 3 by the NaOH of anode room instillation 2mol/L by its pH value; When the pH value of cathode chamber raises, by easily its pH value being adjusted near 7 to the acetic acid of cathode chamber instillation 10%.
Advantage of the present invention is:
1, repairing effect is good, and the present invention is suitable for the contaminated soil of middle and high concentration scope nickel concentration being more than or equal to 200 mg/kg, and clearance reaches more than 95%.By contrast, take the heavy metal removing rate of repeatedly drip washing process contaminated soil repeatedly only to reach about 50%, and only carry out a drip washing process to contaminated soil, heavy metal removing rate is only 30%; Adopt ion electric potential migration recovery technique process contaminated soil, heavy metal removing rate is 70%, and this processing method requires also higher for soil.Because first the present invention carries out a drip washing to contaminated soil, preliminary removal part heavy metal nickel, now still remain many heavy metal nickels in soil, but at this moment soil porosity after drip washing uprises, moisture content is also higher, be combined suitable ion electric potential migration again to repair, just can improve remediation efficiency by high degree.Adopt recovery technique process of the present invention, because drip washing number of times is few, soil fertility reduction numerical value is only repeatedly 20% of elution technique fertility loss, does not substantially affect soil and reuses effect simultaneously.
2, environmental protection and energy saving, drip washing treatment step of the present invention only adopts a drip washing process, can save a large amount of water resources compared with repeatedly elution technique, reduces sewage quantity.Adopt the inventive method on average often to consume 3L water and just can repair 1 kilogram of contaminated soil.
3, economical and practical, processing method of the present invention saves a large amount of water and artificial, greatly can reduce cost consumption, the inventive method is on average often a treatment cycle for 12-13 days simultaneously, comparing, some other is biological prosthetic, Agro-ecology measure is saved time more, can effectively provide Soil Utilization rate.
Detailed description of the invention
The invention discloses a kind of restorative procedure of heavy metal nickel contaminated soil, first to carrying out fragmentation, screening removal bulk solid foreign material containing heavy metal nickel contaminated soil before reparation, then carry out following steps:
1) by mass fraction be 10% acetum spray on nickel contamination soil and carry out drip washing, the mass ratio of acetum and nickel contamination soil is 1:1;
2) at normal temperatures, 12h is left standstill;
3) be separated with the waste water containing heavy metal by the soil after drip washing, the waste water after separation obtains nickel hydroxide precipitate by after nickel recovery by instilling sodium hydroxide solution wherein, and the water after process again can do drip washing and use;
4) heavy metal nickel contaminated soil after drip washing is positioned over fills in the electrolytic cell of water, the two ends of electrolytic cell are provided with anode chamber and cathode chamber, anode chamber, cathode chamber respectively with drip washing after soil separate with the plastic wire that placed amberplex, all deionized water is contained with in anode chamber and cathode chamber, deionized water pH value in anode chamber is 3, deionized water pH value in cathode chamber is 7, by graphite electrode to applying the direct current that voltage gradient is 2V/cm between cathode chamber and anode chamber, under electromotive force effect, remaining heavy metal nickel ion is to movable cathode, enter cathode chamber, now the pH value of anode chamber can reduce, when the pH value of anode chamber is reduced to below 3, by the NaOH of anode room instillation 2mol/L, its pH value is adjusted near 3, nickel hydroxide precipitate can be obtained simultaneously, the pH value of cathode chamber can raise, and is easily adjusted near 7 by its pH value by the acetic acid instilling 10%.
The clay of the experimental subjects of the present embodiment to be nickel concentration be 2000mg/kg, whole experimental period is 15 days, and after measured, in the soil after process, nickel concentration is 100mg/kg, and clearance reaches 95%, and effect clearly.
Method disclosed by the invention is not only applicable to heavy metal nickel, repairing in other heavy metal polluted soil ground such as such as copper, zinc, lead etc., also can reach extraordinary repairing effect.
Claims (5)
1. a restorative procedure for heavy metal nickel contaminated soil, is characterized in that this restorative procedure comprises the following steps:
1) by mass fraction be 10% acetum spray on nickel contamination soil and carry out drip washing, the mass ratio of acetum and nickel contamination soil is 1:1;
2) at normal temperatures, 12h is left standstill;
3) soil after drip washing is separated with the waste water containing heavy metal;
4) heavy metal nickel contaminated soil after drip washing is positioned over fills in the electrolytic cell of water, the two ends of electrolytic cell are provided with anode chamber and cathode chamber, anode chamber, cathode chamber respectively with drip washing after soil separate with the plastic wire that placed amberplex, all deionized water is contained with in anode chamber and cathode chamber, deionized water pH value in anode chamber is 3, deionized water pH value in cathode chamber is 7, by graphite electrode to applying the direct current that voltage gradient is 2V/cm between cathode chamber and anode chamber, under electromotive force effect, remaining heavy metal ion is to movable cathode, enter cathode chamber to reclaim.
2. the restorative procedure of a kind of heavy metal nickel contaminated soil according to claim 1, is characterized in that: described heavy metal nickel contaminated soil is the clay of nickel concentration >=200mg/kg.
3. the restorative procedure of a kind of heavy metal nickel contaminated soil according to claim 1, is characterized in that: before described step 1), first to carrying out fragmentation containing heavy metal nickel contaminated soil, bulk solid foreign material are removed in screening.
4. the restorative procedure of a kind of heavy metal nickel contaminated soil according to claim 1, is characterized in that: in described step 3), and the waste water after separation is again done drip washing and uses after being reclaimed by nickel by electrolysis or precipitation method purified treatment.
5. the restorative procedure of a kind of heavy metal nickel contaminated soil according to claim 1, it is characterized in that: in described step 4), the pH value of target room and anode chamber regulates, comprise: when the pH value of anode chamber drops to below 3, by the NaOH of anode room instillation 2mol/L, its pH value is adjusted near 3; When the pH value of cathode chamber raises, by easily its pH value being adjusted near 7 to the acetic acid of cathode chamber instillation 10%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510213271.XA CN104841691B (en) | 2015-04-30 | 2015-04-30 | A kind of restorative procedure of heavy metal nickel contaminated soil |
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| CN201510213271.XA CN104841691B (en) | 2015-04-30 | 2015-04-30 | A kind of restorative procedure of heavy metal nickel contaminated soil |
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| CN104841691A true CN104841691A (en) | 2015-08-19 |
| CN104841691B CN104841691B (en) | 2017-07-07 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107900091A (en) * | 2017-11-21 | 2018-04-13 | 安徽省宿州市第二中学 | A kind of soil sanitation device and method |
| CN108160186A (en) * | 2017-11-23 | 2018-06-15 | 湖南望隆企业管理咨询有限公司 | A kind of purifier for administering heavy-metal contaminated soil |
| CN109454104A (en) * | 2018-12-13 | 2019-03-12 | 河海大学 | The Experimental Method in Laboratory for carrying out electro reclamation heavy metal polluted soil is converted based on electrode |
| CN110079323A (en) * | 2019-04-30 | 2019-08-02 | 湖南省和清环境科技有限公司 | A kind of arsenic, nickel combined pollution place soil remediation stabilizer and its processing method |
| CN112024590A (en) * | 2020-06-30 | 2020-12-04 | 暨南大学 | Primary battery device for repairing chromium-contaminated soil based on microorganisms and organic matters and repairing method thereof |
| CN115446100A (en) * | 2022-08-17 | 2022-12-09 | 武汉大学 | In-situ reflux chemical leaching and diaphragm electrodialysis coupling green restoration method and device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107900091A (en) * | 2017-11-21 | 2018-04-13 | 安徽省宿州市第二中学 | A kind of soil sanitation device and method |
| CN108160186A (en) * | 2017-11-23 | 2018-06-15 | 湖南望隆企业管理咨询有限公司 | A kind of purifier for administering heavy-metal contaminated soil |
| CN108160186B (en) * | 2017-11-23 | 2019-07-12 | 重庆玖正环境科技有限公司 | A kind of purification device for administering heavy-metal contaminated soil |
| CN109454104A (en) * | 2018-12-13 | 2019-03-12 | 河海大学 | The Experimental Method in Laboratory for carrying out electro reclamation heavy metal polluted soil is converted based on electrode |
| CN110079323A (en) * | 2019-04-30 | 2019-08-02 | 湖南省和清环境科技有限公司 | A kind of arsenic, nickel combined pollution place soil remediation stabilizer and its processing method |
| CN112024590A (en) * | 2020-06-30 | 2020-12-04 | 暨南大学 | Primary battery device for repairing chromium-contaminated soil based on microorganisms and organic matters and repairing method thereof |
| CN112024590B (en) * | 2020-06-30 | 2022-06-07 | 暨南大学 | Primary battery device for repairing chromium-contaminated soil based on microorganisms and organic matters and repairing method thereof |
| CN115446100A (en) * | 2022-08-17 | 2022-12-09 | 武汉大学 | In-situ reflux chemical leaching and diaphragm electrodialysis coupling green restoration method and device |
| CN115446100B (en) * | 2022-08-17 | 2024-03-22 | 武汉大学 | In-situ reflux chemical leaching and diaphragm electrodialysis coupling green repair method and device |
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| CN104841691B (en) | 2017-07-07 |
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