Drip washing method for remedying cadmium-contaminated soil

A technology for cadmium-contaminated soil and polluted soil, which is applied in the field of repairing leaching of heavy metal cadmium-contaminated soil, can solve the problems of lack of leaching and restoration of contaminated soil, and achieve the effects of strong operability, strong biodegradability, and high repair efficiency

Inactive Publication Date: 2014-02-19
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, HEDP is only used in water treatment and other industries at present, and there is a lack of related research on leaching and remediation of contaminated soil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1 Remediation of artificial cadmium-contaminated soil by rinsing.

[0010] Air-dry the collected non-polluted soil samples, remove plant residues and soil clods, and store them in a dry place after passing through a 10-mesh sieve. Take the above soil sample and pass it through a 40-mesh sieve, add a certain amount of cadmium chloride to the test soil sample, and mix well, so that the concentration of heavy metal cadmium in the artificially polluted soil reaches 10 mg·kg -1 , which is equivalent to 10 times the standard value of the third grade of the national soil environmental quality standard. This pollution level is roughly consistent with the heavy metal pollution status and level in Liaoning.

[0011] Take a PVC elution column with an inner diameter of 5 cm and a height of 15 cm. Drill 16 small holes evenly at the bottom of the washing column, and fix two layers of filter paper on the bottom. Accurately weigh 100.00 g of artificially polluted soil and pu...

Embodiment 2

[0015] Example 2 Remediation of artificial cadmium-contaminated soil by rinsing.

[0016] Take a PVC elution column with an inner diameter of 5 cm and a height of 15 cm. Drill 16 small holes evenly at the bottom of the washing column, and fix two layers of filter paper on the bottom. Accurately weigh 100.00 g to a concentration of 10 mg·kg -1 The artificially polluted soil was put into the column, and before rinsing, the soil column was soaked in deionized water until saturated, and hung vertically for 12 hours for later use. Place the soil column on an iron frame, place a funnel with a piece of filter paper at the lower end, and place a beaker at the bottom to collect the eluent. Add a HEDP solution with a soil-to-liquid ratio of 1:1 to 1:5 and a concentration of 3% at one time at the top of the soil column. After the leaching was completed, the content of heavy metal cadmium in the eluent was determined, and each treatment was repeated 3 times.

[0017] Table 2 Effect o...

Embodiment 3

[0020] Example 3 Remediation of artificial cadmium-contaminated soil by rinsing.

[0021] Take a PVC elution column with an inner diameter of 5 cm and a height of 15 cm. Drill 16, 12, 8, 4, and 2 small holes evenly at the bottom of the elution column (that is, the elution time is 30, 60, 120, 180, and 210 min, respectively), and fix two layers of filter paper on the bottom. Accurately weigh 100.00 g to a concentration of 10 mg·kg -1 The artificially polluted soil was put into the column, and before rinsing, the soil column was soaked in deionized water until saturated, and hung vertically for 12 hours for later use. Place the soil column on an iron frame, place a funnel with a piece of filter paper at the lower end, and place a beaker at the bottom to collect the eluent. Add HEDP solution with a soil-to-liquid ratio of 1:3 and a concentration of 3% at one time at the top of the soil column. After the leaching was completed, the content of heavy metal cadmium in the eluent ...

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PUM

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Abstract

The invention relates to a drip washing method for remedying cadmium-contaminated soil. The drip washing method comprises the following steps: taking hydroxy ethylidene diphosphonic acid (HEDP) with the concentration of 0.5-11% as a drip washing agent, and adding the drip washing agent into the cadmium-contaminated soil; collecting eluate, so that the washing process is completed. Experiments show that the drip washing agent has a relatively good effect on removing cadmium in the soil. The drip washing method has the advantages of high remedying efficiency, strong operability, low environmental risk and the like.

Description

technical field [0001] The invention relates to a leaching repair technology for cadmium-contaminated soil, in particular to a leaching method for repairing heavy metal cadmium-contaminated soil. Background technique [0002] Cd accumulated in the soil not only harms the soil ecosystem, but also pollutes surface water and groundwater through runoff and leaching, deteriorates the hydrological environment, and endangers human health through direct contact and enrichment in the food chain. Cd pollution has become a hazard One of the most serious public hazards to the ecological environment and human health, a large amount of Cd polluted soil needs to be treated urgently. Since soil is a heterogeneous complex system with multi-media, multi-interface and multi-component, soil Cd pollution has the characteristics of hysteresis, accumulation, refractory treatment and long repair period, etc. Restoration of Cd-contaminated soil has become an important issue in all countries in the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 崔爽赵杉林李萍孙秀菊刘艺芸张丹
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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