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Method for ultrasonically repairing heavy metal contaminated soil

A technology for complex pollution and polluted soil, applied in the restoration of polluted soil, etc., can solve the problems of short repair time, high cost, and long repair time of heavy metal contaminated soil, and achieve the effect of increasing removal rate and short repair time

Inactive Publication Date: 2015-05-13
ZHEJIANG FORESTRY UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of long repair time and high cost of heavy metal contaminated soil, and provide a leaching method with less dosage of extractant, little impact on soil physical and chemical properties, no secondary pollution, short repair time and high efficiency

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: the method for ultrasonic remediation of heavy metal compound polluted soil

[0025] The contaminated soil was collected from the compound contaminated soil of Cd, Cu, Pb and Zn near a copper smelter in Fuyang City, Zhejiang Province. The air-dried soil samples were ground through a 2 mm stainless steel sieve after removing stones and residual roots, and some of the soil samples were further ground through a 0.15 mm nylon sieve. The contents of cadmium, copper, lead and zinc in the soil were determined to be 13.3 mg·kg -1 , 740 mg·kg -1 , 426 mg·kg -1 and 2133 mg·kg -1 . After pretreatment, 1.0000 g of soil sample was weighed and added to a 100 mL centrifuge tube.

[0026] The subsequent steps of shaking extraction are as follows:

[0027] (1) The concentration of the prepared citric acid solution is 1.0 mol L -1 ;

[0028] (2) mix by solid-liquid ratio 1:25, above-mentioned soil sample is 1.0000 g, and described citric acid solution volume is 25 ...

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Abstract

The invention discloses a method for ultrasonically repairing heavy metal contaminated soil. The method comprises at least following steps: preparation of an extracting agent- citric acid solution; mixing of an extracting agent and polluted soil; mechanical oscillation extraction or ultrasonic-assisted extraction for soil; centrifugal separation and filtration of soil after extraction. According to the method, citric acid is selected as the extracting agent, so that the cost is relatively lower, influence on basic physicochemical property of soil is smaller, secondary pollution cannot be caused, the citric acid is an environment-friendly extracting agent, and four heavy metals including cadmium, copper, lead and zinc in the soil can be effectively removed when the extracting agent and ultrasonic waves are jointly applied to repairing of the heavy metal contaminated soil. The method has the characteristics of good removal effect, small extracting agent dosage and short repairing time.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal pollution in soil, in particular to a method for ultrasonic remediation of heavy metal compound polluted soil. Background technique [0002] In recent years, soil heavy metal pollution has posed a serious threat to food safety, ecological environment and sustainable agricultural development. Heavy metals mainly come from sewage irrigation, large-scale use of chemical fertilizers and pesticides, "three wastes" from electroplating and dye factories, urban garbage and atmospheric deposition. Heavy metal pollution has the characteristics of concealment, long-term and irreversibility. It cannot be degraded by microorganisms, will affect the growth of crops and organisms, and endanger human health and life through the food chain. [0003] At present, the remediation methods of heavy metal-contaminated soil mainly include engineering technology (including alien soil method, soil repla...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 王海龙孙涛
Owner ZHEJIANG FORESTRY UNIVERSITY
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