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Slow-release repairing material for organochlorine pesticide contaminated farmland soil

A restoration material and organochlorine technology, applied in soil conditioning materials, restoration of polluted soil, organic fertilizers, etc., to achieve high-efficiency removal, excellent removal effect, and long-term effect

Inactive Publication Date: 2018-08-10
农环科技(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of organochlorine pesticide-contaminated soil remediation materials containing zero-valent iron and organic carbon sources using biochar and guar gum as physical adsorbents and slow-release embedding agents, respectively, has not been reported.

Method used

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  • Slow-release repairing material for organochlorine pesticide contaminated farmland soil
  • Slow-release repairing material for organochlorine pesticide contaminated farmland soil
  • Slow-release repairing material for organochlorine pesticide contaminated farmland soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing a slow-release restoration material for treating organochlorine pesticides in farmland soil, the steps are as follows:

[0030] (1) Preparation of biochar: Wash the grape vines, put them in an oven at 60°C for overnight drying, crush the dried grape vines and put them in a closed muffle furnace, first raise the temperature to 120°C for 1.0h, and then 25°C / min Raise the temperature to 650°C for 6 hours, pass the obtained biochar through a 100-mesh sieve, pickle with 8% sulfuric acid for 1 hour, wash and dry with distilled water, put it into a brown jar and seal it for storage until use;

[0031] (2) Pretreatment of zero-valent iron powder: place the zero-valent iron powder with a particle size of 120 mesh in 1.5% hydrochloric acid solution, acidify for 10 minutes, rinse with deionized water until the pH is 7, and dry it anaerobically for use;

[0032] (3) Preparation of slow-release restoration materials: a) Weigh 1.0g of biochar and add it to 100m...

Embodiment 2

[0034] To study the effect of different ratios of components on the treatment effect of slow-release repair materials, the specific steps are as follows:

[0035] Three groups of different mass percentages of biochar, zero-valent iron, organic carbon source and guar gum were used to prepare slow-release repair materials. Except for the addition of different components in the mixed solution, the rest of the operating steps were the same as in Example 1. The distribution ratio of the components in the restoration materials is shown in Table 1.

[0036] Table 1 Proportion setting of restoration material components (%, w / w)

[0037]

[0038]Weigh 100g of organochlorine pesticide-contaminated soil and place it in a 250ml brown glass bottle with a stopper, and add the restoration materials of proportions 1-3 in Table 1 therein, and the dosage is 1.0% of the dry weight of the polluted soil. The most common organochlorine pesticide is hexachlorobenzene with a concentration of 1.5m...

Embodiment 3

[0040] To study the effect of the applied amount of slow-release restoration materials on the effect of material treatment, the specific steps are as follows:

[0041] According to the preparation method of Example 1, the slow-release restoration material was prepared.

[0042] Weigh 100g of organochlorine pesticide-contaminated soil and place it in a 250ml brown glass bottle with a stopper, and add restoration materials according to 0.1%, 0.5%, 1.0%, and 2.0% of the dry weight of the polluted soil. The organochlorine pesticide in the polluted soil is hexachlor Benzene, the concentration is 1.2mg / kg. Fully mix the remediation material with the contaminated soil, and then cultivate the mixed system in an artificial climate box at 25°C for 45 days, during which the soil moisture content is maintained at 60% of the maximum field water holding capacity. After the cultivation, soil samples are taken to determine the residue of hexachlorobenzene Concentration, and calculate the rem...

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Abstract

The invention discloses a slow-release repairing material for organochlorine pesticide contaminated farmland soil. A preparation method of the slow-release repairing material comprises the following steps: preparing a biochar carrier; pretreating zero-valence iron powder; and preparing the slow-release repairing material. The slow-release repairing material comprises, by mass, 15-30% of the biochar, 10-20% of an organic carbon source, 5-10% of zero-valence iron, 5-10% of illite and 25-50% of guar gum. The organic carbon source can promote the activity of degrading bacteria as a growth matrix,and the biochar has a strong physical adsorption effect on organochlorine pesticides and provides inorganic nutrient minerals for soil; above effective components are organically combined by an embedding agent to realize the physical-chemical-biological synergistic enhanced repairing of the organochlorine pesticide contaminated farmland soil, so the pollutant removing effect is good, the treatmentlong-acting property of the organochlorine pesticides by the repairing material is improved, and fly-away loss caused by direct application of a powdery raw material is reduced. The slow-release repairing material for organochlorine pesticide contaminated farmland soil is suitable for repairing farmland soil contaminated with low-concentration organochlorine pesticides, and has a very broad application prospect.

Description

technical field [0001] The invention relates to the technical field of organochlorine pesticide-contaminated farmland soil restoration, in particular to a slow-release restoration material for treating organochlorine pesticides in farmland soil. Background technique [0002] Organochlorine pesticides are a class of internationally recognized persistent organic pollutants, which have attracted much attention due to their strong chemical stability, variety, strong toxicity, and difficulty in degrading. Due to the long-term use of organochlorine pesticides in agricultural production activities, the pollution of organochlorine pesticides in farmland soil around the world is quite serious, and the detection of organochlorine pesticides in farmland soils in various parts of my country is also quite common. Agricultural production activities in farmland polluted by organochlorine pesticides will seriously endanger the quality of cultivated land, the safety of agricultural products ...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08C09K101/00
CPCB09C1/08B09C2101/00C09K17/40C09K2101/00
Inventor 孟梁李玉占
Owner 农环科技(上海)有限公司
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