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Method for removing soil heavy metals by utilizing agricultural and forestry waste leaching liquor

A technology of extracting liquid and waste, which is applied in the field of removing heavy metals from soil by using the extracting liquid of agricultural and forestry waste, and achieves the effects of good biodegradability, no secondary pollution, and strong scalability

Pending Publication Date: 2021-12-03
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the existing problems of the existing soil leaching solution in repairing heavy metal-contaminated soil, and to provide a method for removing heavy metals (Cd and Cu) in the soil by utilizing the green leaching solution of agricultural and forestry waste and its application

Method used

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  • Method for removing soil heavy metals by utilizing agricultural and forestry waste leaching liquor
  • Method for removing soil heavy metals by utilizing agricultural and forestry waste leaching liquor
  • Method for removing soil heavy metals by utilizing agricultural and forestry waste leaching liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The main materials used in the experiment: the test soil in this test is real heavy metal polluted paddy soil in Changsha, Hunan and paddy field in Taicang, Jiangsu (Table 1); citric acid (industrial grade 1.7￥kg -1 ) was purchased from Jiangsu Suzhou Panda Chemical Co., Ltd. Pineapple peel (PP), lemon peel (LP) and grapefruit peel (GP) were obtained from Yantai market, and horticultural crabapple fruit (GC) was obtained from Yantai Botanical Garden.

[0043] Preparation of agricultural and forestry waste leaching solution:

[0044] Four kinds of fresh plant wastes of pineapple peel (PP), lemon peel (LP), grapefruit peel (GP) and horticultural crabapple (GC) were cleaned with deionized water and cut into pieces with scissors;

[0045] Weigh 10g, 25g and 50g of each fresh plant fragment and place them in a juice extractor, add 100mL deionized water or 0.1mol·L -1 100mL of citric acid (CA) is used to extract juice from different wastes in different amounts, and after th...

Embodiment 2

[0050] The main materials used in the experiment: the test soils in this test are paddy soil in Changsha, Hunan, paddy soil in Taicang, Jiangsu, and brown soil in orchards in Yantai, Shandong (Table 1); citric acid (industrial grade 1.7 ￥ kg -1 ) was purchased from Jiangsu Suzhou Panda Chemical Co., Ltd.; pineapple peel (PP) was obtained from Yantai market.

[0051] Table 1 Main physical and chemical properties of soils polluted by different heavy metals

[0052]

[0053] Preparation of agricultural and forestry waste leaching solution:

[0054] After cleaning the fresh waste of pineapple peel (PP) with deionized water, cut it into pieces with scissors; weigh 25g of fresh pineapple peel pieces and place them in a juice extractor, add 100mL of deionized water or 0.1mol · L -1 100mL of citric acid (CA) was used to squeeze the juice, and after the juice was squeezed, the pineapple peel water extract and the citric acid composite extract with a concentration of 25% were filte...

Embodiment 3

[0066] Removal effect of agricultural and forestry waste leaching residues on leaching waste liquid from polluted soil

[0067]The soil for testing in this test is real heavy metal polluted Hunan Changsha upland paddy soil, Jiangsu Taicang paddy field paddy soil and Yantai orchard brown soil (Table 1), based on the leaching test of pineapple peel solubilizing bottle under the optimal soil parameters in Example 2, research Adsorption effect of pineapple water leaching residue on leaching waste.

[0068] After passing the above-mentioned solubilizing bottle leaching test, pipette 20mL of different leaching solutions (single citric acid, pineapple peel water extract and pineapple peel citric acid composite extract) the leaching waste produced under one-step leaching treatment respectively to In a 50mL centrifuge tube, adjust the pH of the solution to 6.0±0.1, add 1g of pineapple peel residue material (residue after filtration of 25% pineapple peel water extract) -1 The rate of c...

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Abstract

The invention relates to the technical field of soil heavy metal pollution remediation, in particular to a method for removing soil heavy metal by utilizing agricultural and forestry waste leaching liquor. The agricultural and forestry waste leaching solution is used as a leaching solution for removing heavy metals in the polluted soil, wherein the agricultural and forestry waste leach liquor is obtained by leaching agriculture and forestry waste with water or citric acid. The agricultural and forestry wastes are selected as leaching remediation raw materials, so that the method has the advantages of low cost, environmental protection, high efficiency, short remediation period, no damage to the soil environment and the like, and remediation of the heavy metal contaminated soil and resource recycling of the agricultural and forestry wastes are realized; meanwhile, the risk of secondary pollution of the leaching waste liquid to the soil or underground water is solved by utilizing the leaching residues, and conditions are created for environment-friendly integrated rapid repair and application of the heavy metals in the farmland soil-waste liquid.

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 removing heavy metals in soil by using an extraction solution of agricultural and forestry waste. Background technique [0002] Heavy metal pollution in soil has become one of the most common and serious environmental problems in the world, and heavy metal pollution in agricultural land poses a major threat to human health, food and ecological security. Cd and Cu are common heavy metal pollutants in China's agricultural land soil. The pollution has the characteristics of low concentration, long-term and accumulation. Excessive accumulation in the soil will lead to increased absorption of heavy metals by crops, affecting the yield and quality of crops. Heavy metals entering the food chain pose a huge risk to human health. Therefore, there is an urgent need for research on the remediation of Cd and Cu-contaminated agricultural land...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 杨帅李远刘国明骆永明
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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