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Method of leaching renovating cadmium polluted soil

A cadmium-contaminated soil and leaching technology, which is applied in the restoration of polluted soil and other directions, can solve problems such as inability to elute heavy metals, and achieve the effects of less soil nutrient loss, high restoration efficiency and less environmental risk.

Active Publication Date: 2019-06-14
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of amino acids for soil leaching cannot elute heavy metals in soil

Method used

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  • Method of leaching renovating cadmium polluted soil
  • Method of leaching renovating cadmium polluted soil
  • Method of leaching renovating cadmium polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Take 21.5mL 36% hydrochloric acid and pour it into a beaker, dissolve it with deionized water and set the volume in a 250mL volumetric flask to make 1mol / L hydrochloric acid;

[0029] (2) Pour 18.8g glycine into the prepared solution of step (1), and stir evenly;

[0030] (3) Pour the mixed solution obtained in step (2) into a 500mL round bottom flask equipped with a condensing device, and react at a constant temperature at 60°C for 8 hours;

[0031] (4) The solution obtained in underpressure distillation step (3) obtains a white solid powder, which is a glycine-hydrochloride ionic liquid, such as figure 1 Shown ([see " preparation and performance research of chitosan fiber under the condition of novel amino acid ionic liquid ", Tang Yingjun, master's degree thesis, Qingdao University of Science and Technology, June 2011, Section 2.2.2]), the prepared The chemical formula of glycine-hydrochloride ionic liquid is: [HCl]+[NH 2 CH 2 COOH]→[COOHCH 2 NH 3 ] + [Cl] ...

Embodiment 2

[0035] Add glycine to hydrochloric acid solution, wherein the molar ratio of glycine and hydrochloric acid is 1:1, mix well, react at 20°C for 5 hours, and distill under reduced pressure to obtain white solid powder, which is glycine-hydrochloric acid ionic liquid.

Embodiment 3

[0037] Weigh 5.00g of cadmium-contaminated soil samples, add 0.1, 0.2, 0.3, 0.4, 0.5, 0.7, 1.0mol / L glycine-hydrochloric acid ionic liquid aqueous solution (prepared in Example 1) respectively by water-to-soil ratio 2:1, shake at room temperature 2h, centrifuge at 3000r / min for 5min, filter, measure the content of heavy metal cadmium in the supernatant, repeat the treatment 3 times, the results are shown in Table 1. The results show that the removal rate of cadmium is the highest when the concentration of glycine-hydrochloride ionic liquid aqueous solution is 0.5mol / L, which can reach 75%. Since the greater the concentration of the eluate, the more serious the damage to soil nutrients will be, and considering the cost, the optimal concentration of the eluate is preferably 0.3mol / L glycine-hydrochloric acid ionic liquid aqueous solution. At this concentration, the removal rate of cadmium is 72%. %, and as the concentration of eluent increases, the change of removal rate is less...

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Abstract

The invention discloses a method of leaching renovating cadmium polluted soil, and belongs to the technical field of soil renovation. According to the method of leaching renovating the cadmium polluted soil, an amino-acid-hydrochloric-acid ion liquid aqueous solution is used as a leaching agent, the leaching agent is added to the cadmium polluted soil according to the water-soil ratio greater than 2 to 1, oscillation and solid-liquid separation are carried out, and leaching can be finished; compared with an existing leaching agent, the leaching agent used in the soil leaching method is low insoil nutrient loss amount, can increase rapid available phosphorus and nitrogen in the soil, and has certain function of increasing fertility; the leaching method is high in leaching efficiency, theremoving rate of cadmium can reach up to 84%, and the leaching method has the characteristics that the renovating efficiency is high, the maneuverability is high, the environment risk is low and the like.

Description

technical field [0001] The invention relates to a method for washing and repairing cadmium-contaminated soil, which belongs to the field of soil repair technology. Background technique [0002] Since the 20th century, the problem of soil heavy metal pollution has become increasingly serious. The 2014 "National Soil Pollution Survey Bulletin" shows that heavy metal pollution in my country's soil exceeds the standard points accounting for 82.8% of all the exceeding points, among which cadmium (Cd) pollution has become one of the main pollutants of soil inorganic pollution. Cadmium can accumulate and migrate after being absorbed by plant roots. According to statistics, the area of ​​cadmium-contaminated farmland in my country has reached 278,600 hectares, and agricultural products with excessive cadmium content have reached 1.46 billion kilograms per year, and 10% of rice in my country has exceeded the limit standard of 0.2mg / kg ( GB15201294), a serious threat to people's healt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08
Inventor 高欣邓芸唐道远汤颖玺曹文义宋飞跃谢利娟阮文权
Owner JIANGNAN UNIV
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