CN103084384A - Application of oxalic acid in removal of soil cadmium pollution - Google Patents
Application of oxalic acid in removal of soil cadmium pollution Download PDFInfo
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- CN103084384A CN103084384A CN2013100058101A CN201310005810A CN103084384A CN 103084384 A CN103084384 A CN 103084384A CN 2013100058101 A CN2013100058101 A CN 2013100058101A CN 201310005810 A CN201310005810 A CN 201310005810A CN 103084384 A CN103084384 A CN 103084384A
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Abstract
The invention relates to an application of oxalic acid in removal of soil cadmium pollution. High-level pure oxalic acid is selected to prepare an oxalate solution with the concentration of 0.05wt%-1wt%, and the oxalate solution is used as an eluting agent; the eluting agent is added into polluted soil; an eluting process can be finished by oscillating, centrifuging and collecting an eluted solution at room temperature and then filtering the eluted solution; and a liquid to solid ratio of the chemical eluting agent to the polluted soil is 10:1 (ml/g). The chemical eluting agent formula is simple; the effect is outstanding; the operability is high; the application cost is low; the eluting rate is high; and a relatively good effect of removing cadmium ions in the soil is achieved. A test shows that when the concentration is 0.2 percent, the eluting rates are respectively 65.91 percent and 48.065 percent; and secondary pollution to the soil is avoided.
Description
Technical field
The present invention relates to recovery technique field, the especially oxalic acid application in removing Cadmium Pollution in Soils of Heavy Metals In Environment.
Background technology
Along with the expansion of commercial production scale and the rapid growth of population, heavy metal in soil pollutes day by day serious.And thereby the heavy metal in contaminated soil can migrate to and have a strong impact on environmental quality and economic sustainable development in water body and plant, and threatens the mankind's health.
Soil heavy metal cadmium has the characteristics such as disguise, chronicity and irreversibility.Simultaneously, pay attention to simultaneously most as present China and be also that the widest its pollutant of heavy metal-polluted soil type of coverage can cause obvious harm to growing of crops, also can jeopardize human health by food chain.
At present adopt plant restoration method for the improvement of soil heavy metal cadmium more.Phytoremediation is low because of its cost, manageability, do not produce the advantages such as secondary pollution and extensively adopted by people.Then because the heavy metal accumulation of recommending or super enriching plant often have that biomass is low, repairing efficiency long, are subject to the characteristics such as climatic effect, thereby it is low to repair benefit.
Soil washing belongs to the heavy metal chemical repair method, is namely to utilize chemistry or biological eluent to strengthen the animal migration of heavy metal in soil, thereby heavy metal is effectively removed from soil.The normal eluent that uses comprises inorganic eluent, artificial chelating agent, biosurfactant etc. in scientific research and practice.Yet, studies show that strong acid eluent meeting spoiled soil structure in lessivation, the biocoene of poisoning in soil causes soil again to utilize; Its biological degradability of EDTA, EDDS and surfactant is poor, and production cost is high, easily causes secondary pollution (Lv Qingsong, Jiang Yufeng etc., 2010).And repair object and mainly concentrate on mine, smeltery, the drip washing of the serious pollution soil such as municipal sludge (Moutsatsou, A et al., 2006).
Therefore, choose degradable, hypotoxicity, applicable low-concentration heavy metal contaminated soil and can have environmental benefit and economic benefit concurrently, and being convenient to the applicable eluent of engineering, and studying it and repair supporting technology scheme and have practical value.
Oxalic acid belongs to low molecular organic acids, cheap, easy degraded, and its washout rate reaches respectively 65.91% and 48.065%. when eluent concentration is 0.2% in to the drip washing of low concentration and high concentration cadmium pollution soil test, has reduced to cause the risk of secondary pollution.
Summary of the invention
The object of the invention is to overcome the deficiency that prior art exists, provide oxalic acid as the application of eluent in removing Cadmium Pollution in Soils.
In order to realize the foregoing invention purpose, the technical solution used in the present invention is as follows:
The application of oxalic acid in removing Cadmium Pollution in Soils, choose the pure oxalic acid of top grade, be mixed with concentration and be the oxalic acid solution of 0.05 wt %-1wt% as eluent, add this eluent in contaminated soil, at room temperature vibration, centrifugal, collect to filter after eluate and can complete lessivation; The liquid-solid ratio of chemical leaching and contaminated soil is 10:1(ml/ g).
Described application, described cadmium pollution soil are that concentration is the cadmium pollution soil of 20-120mg/kg.
Compared with prior art, the present invention has following beneficial effect:
1. the present invention's chemical leaching agent prescription used is simple, effect is remarkable, application cost is low, washout rate is high, and the cadmium ion that exists in soil is had outstanding removal effect.
2. the present invention's chemical leaching used is for low, high concentration cadmium pollution soil, and show by test: oxalic acid washout rate in the drip washing of low concentration cadmium pollution soil reaches 65.905% when concentration reaches 0.2%, and washout rate is 48.065% in the drip washing of high concentration cadmium pollution soil.Thereby it is better to the drip washing effect of low concentration cadmium pollution soil to show oxalic acid.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is described in detail
Embodiment 1 soil heavy metal cadmium drip washing
Choose the pure oxalic acid of top grade, be mixed with respectively concentration and be the oxalic acid solution of 0.05wt%-1 wt % as eluent, choose the contaminated soil that cadmium content is respectively 17.85mg/kg and 118.34mg/kg, according to liquid-solid ratio 10:1(ml/ g) add eluent, at room temperature vibrated 2 hours, hunting speed is 200 rev/mins, subsequently eluate is transferred in centrifuge tube with the speed of 4000 rev/mins centrifugal 15 minutes, get its supernatant liquid filtering and collect, and utilizing atomic absorption spectrophotometry light instrument degree to measure the content (table 1) of Cd in leacheate.By analysis, along with the rising of the eluent concentration washout rate to cadmium raises gradually, when concentration reaches 0.2%, low concentration and high concentration cadmium pollution soil washout rate are reached respectively 65.91% and 48.065%, show the drip washing effect of low concentration cadmium pollution soil better.Washout rate reduces along with the increase of concentration of oxalic acid subsequently.Cadmium content after processing in soil obviously reduces.
The content of heavy metal Cd in table 1 leacheate
Annotate: in table, data are the mean value of 3 repetitions.
In sum, oxalic acid has outstanding effect as degradable organic acid chemical leaching to repairing the low concentration cadmium pollution soil.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improve and conversion all should belong to the protection domain of claims of the present invention.
Claims (2)
1. the application of oxalic acid in removing Cadmium Pollution in Soils, it is characterized in that, choose the pure oxalic acid of top grade, be mixed with concentration and be the oxalic acid solution of 0.05wt%-1wt% as eluent, add this eluent in contaminated soil, at room temperature vibration, centrifugal, collect to filter after eluate and can complete lessivation; The liquid-solid ratio of chemical leaching and contaminated soil is 10:1(ml/g).
2. application claimed in claim 1, is characterized in that, described cadmium pollution soil is that concentration is the cadmium pollution soil of 20-120mg/kg.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100058101A CN103084384A (en) | 2013-01-08 | 2013-01-08 | Application of oxalic acid in removal of soil cadmium pollution |
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| CN2013100058101A CN103084384A (en) | 2013-01-08 | 2013-01-08 | Application of oxalic acid in removal of soil cadmium pollution |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103639187A (en) * | 2013-12-17 | 2014-03-19 | 辽宁石油化工大学 | Method for restoring zinc polluted soil with 2-hydroxyphosphonoacetic acid (HPAA) |
| CN105880274A (en) * | 2016-05-17 | 2016-08-24 | 云南民族大学 | Washing system for removing lead in polluted soil |
| CN106493164A (en) * | 2016-08-24 | 2017-03-15 | 天津市北方创业园林股份有限公司 | A kind of method that utilization citric acid extracts drip washing restoration of soil polluted by heavy metal |
| CN108990988A (en) * | 2016-04-18 | 2018-12-14 | 华南农业大学 | A kind of barrier and its application method reducing crop edible part content of beary metal |
| CN112108509A (en) * | 2020-07-24 | 2020-12-22 | 中南大学 | Method for removing arsenic, cadmium and lead in field soil by using combined eluent in synergy mode |
| CN114133935A (en) * | 2021-11-29 | 2022-03-04 | 北京师范大学 | Oxalic acid-based cleaning active material reinforced by ferric trichloride and organic phosphonic acid |
| CN115069758A (en) * | 2022-06-17 | 2022-09-20 | 温州大学 | Method for extracting cadmium in polluted soil by using gallic acid organic solution |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103639187A (en) * | 2013-12-17 | 2014-03-19 | 辽宁石油化工大学 | Method for restoring zinc polluted soil with 2-hydroxyphosphonoacetic acid (HPAA) |
| CN108990988A (en) * | 2016-04-18 | 2018-12-14 | 华南农业大学 | A kind of barrier and its application method reducing crop edible part content of beary metal |
| CN108990988B (en) * | 2016-04-18 | 2021-05-18 | 华南农业大学 | Barrier agent for reducing heavy metal content of edible part of crop and use method thereof |
| CN105880274A (en) * | 2016-05-17 | 2016-08-24 | 云南民族大学 | Washing system for removing lead in polluted soil |
| CN106493164A (en) * | 2016-08-24 | 2017-03-15 | 天津市北方创业园林股份有限公司 | A kind of method that utilization citric acid extracts drip washing restoration of soil polluted by heavy metal |
| CN112108509A (en) * | 2020-07-24 | 2020-12-22 | 中南大学 | Method for removing arsenic, cadmium and lead in field soil by using combined eluent in synergy mode |
| CN114133935A (en) * | 2021-11-29 | 2022-03-04 | 北京师范大学 | Oxalic acid-based cleaning active material reinforced by ferric trichloride and organic phosphonic acid |
| CN115069758A (en) * | 2022-06-17 | 2022-09-20 | 温州大学 | Method for extracting cadmium in polluted soil by using gallic acid organic solution |
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Application publication date: 20130508 |