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Environment-friendly cadmium metal polluted soil eluant and preparation method thereof

A polluted soil, environment-friendly technology, applied in the field of soil environment restoration, can solve secondary pollution and other problems, achieve the effect of reducing environmental impact, enhancing solubility, and promoting transfer

Inactive Publication Date: 2017-11-21
南京凯杰环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that common soil leaching agents are prone to secondary pollution, the invention provides an environmentally friendly cadmium metal-contaminated soil leaching agent and a preparation method thereof. The leaching agent can effectively remove cadmium metal in soil, and has biological Degradability, no secondary pollution to the environment, safe and reliable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Contaminated soil: Taken from a cadmium-contaminated farmland in Nanjing, the cadmium content is 4325mg / kg. After natural air-drying, plant residues and stones were removed, and ground through a 100-mesh sieve for disposal.

[0016] According to the method provided by the present invention, accurately take by weighing concentration 1% citric acid solution 100g, 1% tartaric acid solution 50g, after mixing uniformly, add successively 0.5% rhamnolipid solution 150g, 0.5% saponin solution 150g, sodium bicarbonate 5g , add water to dilute to 1500g, obtain soil washing agent, pH7.3.

[0017] Put the polluted soil in the leaching column, the leaching agent drips into the soil through the infusion tube, and rinses three times, then filters the eluate collected at the bottom of the leaching column, and determines the content of heavy metal cadmium in it, randomly selects the polluted soil, and repeats Three times, the measured concentration of cadmium in the eluate was 853 mg / kg...

Embodiment 2

[0019] Add 2.5g of divalent cadmium to 500g of clean soil (moisture content <10%), stir and mix evenly, and ripen for 1 week before use. Take the simulated soil sample, dry it to constant weight, crush it, and pass it through a 100-mesh sieve to be the contaminated soil sample to be treated. According to the process provided by the present invention, accurately weigh 300 g of 5% citric acid solution, add 400 g of 5% rhamnolipid solution, and dilute to 1000 g with water to obtain the soil washing agent.

[0020] Put the polluted soil in the leaching column, the leaching agent drips into the soil through the infusion tube, and rinses three times, then filters the eluate collected at the bottom of the leaching column, and determines the content of heavy metal cadmium in it, randomly selects the polluted soil, and repeats Three times, the measured concentration of cadmium in the eluate was 220mg / kg, and the removal rate reached 95.6%.

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Abstract

The invention discloses an environment-friendly cadmium metal polluted soil eluant and a preparation method thereof. The preparation method specifically comprises the following steps: preparing 10-30 parts of natural chelator of which the mass concentration is 1-5%, 20-40 parts of biosurfactant of which the mass concentration is 0.5-5% and 0.1-1 part of pH regulator; and uniformly mixing the solutions, and then performing dilution with distilled water to 100 parts, thereby obtaining the cadmium metal polluted soil eluant having a pH value of 6-8. The environment-friendly cadmium metal polluted soil eluant disclosed by the invention is simple and nontoxic in the raw materials, low in cost, favorable in a heavy metal removal effect and neutral in the pH value, can be easily degraded, and can not cause secondary pollution to soil.

Description

technical field [0001] The invention relates to the field of soil environment restoration, in particular to a preparation method of an environmentally friendly cadmium metal polluted soil washing agent. Background technique [0002] In recent years, with the continuous acceleration of industrialization and urbanization in my country, soil environmental pollution, especially heavy metal pollution, has become increasingly serious. Cadmium is one of the most toxic heavy metals. It is highly toxic and highly mobile in the biosphere. It can cause chronic poisoning to the human body through the enrichment of the food chain, such as the bone pain caused by the cadmium pollution incident in Japan. With the development of my country's metallurgy, mining and cadmium processing industries, it is of practical significance to control the serious cadmium pollution in farmland. [0003] At present, the remediation methods for contaminated soil mainly include heat treatment technology, soi...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
Inventor 杜峰高卫民
Owner 南京凯杰环境技术有限公司
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