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Method for removing lead from contaminated soil by virtue of taro leaf or achyranthes bidentata leaching

A technology of polluted soil and taro leaves, applied in the field of remediation of polluted soil in the environment, can solve the problems of low efficiency, high cost, secondary pollution, etc., and achieve the effect of convenient operation and obvious effect

Inactive Publication Date: 2015-04-29
SICHUAN AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the existing technology has problems such as secondary pollution, high cost or low efficiency, so it needs to be improved to screen out leaching materials that are environmentally friendly, low in cost and high in leaching efficiency

Method used

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  • Method for removing lead from contaminated soil by virtue of taro leaf or achyranthes bidentata leaching
  • Method for removing lead from contaminated soil by virtue of taro leaf or achyranthes bidentata leaching
  • Method for removing lead from contaminated soil by virtue of taro leaf or achyranthes bidentata leaching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Preparation of contaminated soil eluent

[0025] Wash taro leaves, achyranthes bidentata, white clover and watermelon peel with tap water respectively, rinse with distilled water, place them in a naturally ventilated place to air dry, and use a grinder to grind them through a 2mm sieve.

[0026] Add 10g, 20g, 60g and 100g of taro leaf powder to 2000ml of distilled water, vibrate and extract at a speed of 180r / min for 12h and then filter, so that the taro leaf powder and distilled water are fully contacted and mixed. The eluents with concentrations of 5g / L, 10g / L, 30g / L and 50g / L of taro leaves were prepared respectively. The preparation method of distilled water extraction eluate with the concentration of 5g / L, 10g / L, 30g / L and 50g / L of Achyranthes bidentata, white clover and watermelon rind is the same as that of taro leaf eluate.

[0027] , leaching of contaminated soil

[0028] According to distilled water, distilled water + 5g / L taro leaf eluent, distilled wate...

Embodiment 2

[0035] 1. Preparation of taro leaf and Achyranthes knuckle lotion

[0036] Wash the taro leaves and Achyranthes bidentata respectively with tap water, place them in a naturally ventilated place to air-dry, and use a grinder to grind them.

[0037] Add 0.5kg, 1kg, 3kg and 5kg of taro leaf powder to 100L tap water, oscillate and extract at a speed of 180r / min for 12h, and then filter with gauze to obtain solutions with taro leaf concentrations of 5g / L, 10g / L, 30g / L and 50g / L eluent. Achyranthes bidentata concentrations of 5g / L, 10g / L, 30g / L and 50g / L tap water eluents were prepared in the same way as taro leaf eluents.

[0038] , leaching of 500g contaminated soil

[0039]According to tap water, tap water + 5g / L taro leaf rinse, tap water + 10g / L taro leaf rinse, tap water + 30g / L taro leaf rinse, tap water + 50g / L taro leaf rinse; tap water + 5g / L Achyranthes bidentata eluate, tap water+10g / L Achyranthes bidentata eluate, tap water+30g / L Achyranthes bidentata eluate, tap wat...

Embodiment 3

[0048] The preparation method of the leaching agent and the rinsing steps of the polluted soil are kept consistent with the conditions in the examples, only the volume ratio parameters of the polluted soil and the eluent of the biomass material are changed, and the test is performed under different ratio conditions. Changes, see Table 3 for specific data.

[0049] Table 3 Efficiency of four biomass materials to remove lead from polluted soil under different soil-liquid ratio conditions

[0050]

[0051] Note: The concentration of the eluting agent is the extraction concentration of taro leaf, hyssop, white clover and watermelon rind; each treatment was repeated 3 times, and the data in the table are the average value of 3 repetitions.

[0052] It can be seen from Table 3 that under the same conditions, the leaching agents prepared by using biomass materials taro leaves, hyssopia, white clover and watermelon rinds respectively, under the same concentration conditions of lea...

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Abstract

The invention relates to the technical field of remediation of contaminated soil in the environment, and particularly relates to a method for removing lead from contaminated soil by virtue of taro leaf or achyranthes bidentata leaching. The method comprises the following steps: (1) preparing biomass leachate: washing a biomass material taro leaves with tap water, rinsing the taro leaves with distilled water, air-drying the taro leaves at a naturally-ventilated place, grinding the taro leaves by virtue of a crusher, sieving the taro leaves with a 2mm sieve, adding a proper amount of distilled water, performing oscillatory extraction on the mixed liquor for 12h, and performing filtration to obtain the leachate; (2) leaching the contaminated soil: adding the leachate obtained in step (1) into the lead-contaminated soil, regulating the pH value of the mixed solution to 4.4 to 5.0 by virtue of diluted hydrochloric acid and a sodium hydroxide solution, and performing oscillatory leaching. Achyranthes bidentata can be used instead of the biomass material taro leaves. The method is convenient and simple, an obvious leaching effect on the lead-contaminated soil is played, and secondary contamination to the environment is avoided.

Description

technical field [0001] The invention relates to the technical field of remediation of polluted soil in the environment, in particular to a method for removing lead in polluted soil by leaching with taro leaves or achyranthes bidentata. Background technique [0002] Soil heavy metal pollution is one of the serious environmental problems facing the world today. Lead is a non-essential nutrient element for organisms. When its concentration exceeds a certain threshold, it will produce severe toxicity to organisms, and it is often transmitted through the food chain to cause various diseases in the human body. Mining, smelting, electroplating, sewage irrigation, chemical fertilizer and pesticide abuse are the main sources of lead pollution. With the development of industry and agriculture and urbanization in my country, the spread of heavy metal lead pollution in soil is gradually deepening. Therefore, the remediation of lead-contaminated soil has become an urgent problem to be s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 张世熔姚苹李婷赖晶晶龚国淑徐小逊邓欧平
Owner SICHUAN AGRI UNIV
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