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Method for removing lead and zinc in contaminated soil by leaching with biologic materials

A technology of biomass materials and polluted soil, which is applied in the field of removing lead and zinc in contaminated soil by leaching with biomass materials, which can solve the problems of soil matrix damage to nutrients, easy residue, and secondary pollution of soil, etc., and achieves obvious leaching effect , Easy to operate, wide range of effects

Active Publication Date: 2015-09-23
CHENGDU URBAN MODERN AGRI IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, hydrochloric acid and CaCl 2 It has a good leaching effect on heavy metals in the soil, but its use will cause damage to the soil matrix and nutrient loss, and excessive inorganic ions may cause soil salinization and increase follow-up treatment costs; Deng Hongxia et al. use saponin and EDTA Combined removal of Pb in polluted soil, but due to the poor biodegradability of chelating agents in the soil, it is easy to remain in the washing process, resulting in secondary pollution of the soil; while surfactants such as rhamnolipids are expensive and source Limited, limited in practical use

Method used

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  • Method for removing lead and zinc in contaminated soil by leaching with biologic materials
  • Method for removing lead and zinc in contaminated soil by leaching with biologic materials
  • Method for removing lead and zinc in contaminated soil by leaching with biologic materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Phytoleaching to remediate polluted soil in a lead-zinc mining area in Hanyuan

[0023] (1) Preparation of eluent

[0024] Sangria mulberry, centipede grass, false chickweed, nepeta, mulberry leaf, clematis, senecio, asparagus, fenugreek, fenugreek, saddle leaf beetle, castor plant, lacquer and goose down The vines were washed with distilled water and placed in a naturally ventilated place to air-dry, and were ground through a 2mm sieve using a pulverizer.

[0025] Add 6g, 10g, 16g and 20g of each plant powder into 200mL distilled water respectively, at 200r / min -1 Shake at constant temperature for 24 hours, and filter to obtain eluents with 4 concentrations of 30g / L, 50g / L, 80g / L and 100g / L.

[0026] (2) Oscillating leaching of contaminated soil

[0027] Take 4 different concentrations of the above 14 kinds of plant eluents and 20ml of distilled water for a total of 57 treatments, and add them to 1.00g of contaminated soil at a soil-to-liquid ratio of 1:20. The pH ...

Embodiment 2

[0037] Embodiment 2: Lead-zinc leaching efficiency under different leaching time

[0038] The preparation method of the leaching agent and the leaching steps of the polluted soil are consistent with the conditions in Example 1, only the leaching oscillation time is changed, and the change of the leaching rate is tested under different oscillation times. For specific data, refer to the table 2.

[0039] Table 2 Efficiency of 14 kinds of plant leaching agents to remove lead and zinc from contaminated soil in mining areas under different leaching time

[0040]

[0041]

[0042]

[0043] Note: The eluent concentration is the extraction concentration of 14 kinds of plant powders; each treatment was repeated 3 times, and the data in the table is the average value of 3 repetitions of one leaching.

[0044] It can be seen from Table 2 that under the same conditions, the use of biomass materials such as horse mulberry, centipede grass, false chickweed, nepeta, mulberry leaves...

Embodiment 3

[0045] Example 3: Determination of the leaching efficiency of each biomass to lead and zinc in polluted soil under different pH conditions

[0046] The preparation method of leaching agent and the leaching step to polluted soil are consistent with the conditions in embodiment 1, only change the pH value of mixed solution wherein, test each biomass to the lead-zinc in polluted soil under different pH value conditions. For the variation of the leaching rate, refer to Table 3 for specific data.

[0047] Table 3 Efficiency of 14 plant leaching agents to remove lead and zinc from contaminated soil in mining areas under different pH values

[0048]

[0049]

[0050] Note: The eluent concentration is the extraction concentration of 14 kinds of plant powders; each treatment was repeated 3 times, and the data in the table is the average value of 3 repetitions of one leaching.

[0051] This study tested the leaching rates of lead and zinc under acidic, neutral and alkaline conditio...

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Abstract

The invention relates to the technical filed of restoring of contaminated soil in the environment, and in particular relates to a method for removing lead and zinc in the contaminated soil by leaching with biologic materials. According to the method, distilled water is used for the vibration digestion on air-dried plant powders, the filter liquor is added into the soil, then the pH value of mixed solution is adjusted using dilute nitric acid and sodium hydroxide solution, and finally lead and zinc in the soil are vibrated and leached out. According to the method for removing lead and zinc in the contaminated soil by leaching with biologic materials, coriaria sinica maxim, pistacia weinmannfolia, castor-oil plant or euphorbia helioscopia are used as flushing agent, the cost is low, the source is wide, the leaching effect on the soil is obvious, and the secondary pollution does not occur on the environment.

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 and zinc in polluted soil by leaching with biomass materials. Background technique [0002] In recent decades, the extensive mining of lead-zinc mines has led to increasingly serious soil pollution in the surrounding farmland. Excessive lead and zinc in the soil not only cause varying degrees of harm to crops, but also toxic heavy metals affect human health through the food chain. Therefore, the remediation of lead-zinc composite polluted soil has become one of the problems to be solved urgently. [0003] At present, the common soil heavy metal remediation methods mainly fall into three categories: physical, chemical and biological remediation, including solidification and stabilization, leaching and phytoremediation. Among them, although the leaching technology has a certain disturbance to the soil matrix, due ...

Claims

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Application Information

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IPC IPC(8): B09C1/02
Inventor 张世熔曹雅茹陈月王贵胤徐小逊李婷
Owner CHENGDU URBAN MODERN AGRI IND TECH RES INST CO LTD
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