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Method for repairing phthalate-polluted farmland soil by applying green manure plants

A phthalate ester and phytoremediation technology, applied in the restoration of contaminated soil, etc., can solve problems such as PAEs pollution, and achieve the effects of environmental friendliness, strong adaptability, and promotion of degradation

Active Publication Date: 2022-07-12
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there is no report on the use of green manure plants alfalfa and vetch to remediate PAEs pollution in farmland soil

Method used

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  • Method for repairing phthalate-polluted farmland soil by applying green manure plants
  • Method for repairing phthalate-polluted farmland soil by applying green manure plants
  • Method for repairing phthalate-polluted farmland soil by applying green manure plants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for applying green manure plants to remediate phthalate pollution in farmland soil, comprising the following steps:

[0034] Step 1: Loosen and level the contaminated soil to be repaired; specifically, loosen and level the soil to be repaired, open drainage and irrigation ditches, apply basal fertilizer, and irrigate until the soil is moist, so that the soil water content reaches about 70% of the soil water holding capacity.

[0035] Step 2, planting alfalfa or A. alfalfa in the polluted soil; specifically, soaking the alfalfa or A. alfalfa seeds in warm water for 24 h before sowing, and then sowing into the polluted soil; wherein, the seeding amount of alfalfa is 1.5-2 kg / mu , the sowing rate of thorn seed is 3-4 kg / mu; the method of spring or autumn sowing is adopted, and the growth period is 45 days to 65 days.

[0036] Step 3: Detecting the content of PAEs in the reconditioned contaminated soil; the detection results satisfy the total concentration of 6 PAE...

Embodiment 2

[0043] Green manure test for indoor pot planting

[0044]The indoor pot experiment was carried out with DEHP, which has the highest pollution concentration and is more difficult to degrade in soil, as the representative PAEs pollutant. The soil tested was a 0-20 cm layer of yellow-brown soil (32°01′58″N, 118°52′15″E) collected from farmland in Nanjing, Jiangsu Province, with a pH value of 7.24 and an organic carbon content of 7.44 g / kg, the clay content was 27%. The yellow-brown soil was air-dried to remove sundries such as plant roots, and passed through a 2 mm stainless steel screen. A portion of the sieved soil was taken to prepare 0 and 5000 mg / kg DEHP-contaminated parent soil. Take 1% of the contaminated mother soil and 99% of the sieved soil and mix them thoroughly to prepare DEHP-contaminated soil of 0 and 50 mg / kg.

[0045] Put DEHP-contaminated soil into a glass jar (30 cm*20 cm*20 cm) with a soil depth of 15 cm. The soil water content was adjusted to 50% of the ...

Embodiment 3

[0052] Indoor experiment of green manure turning and pressing

[0053] The soil source, properties, preparation method and concentration of PAEs pollution used in the test are the same as those in Example 1.

[0054] Mix 2 kg of DEHP-contaminated soil with 10 g of crushed fresh alfalfa or A. alfalfa stems and leaves, and put them into a ceramic pot. Adjust the soil water content to 50% of the maximum water holding capacity in the field, cultivate at a constant temperature in an artificial greenhouse at 25°C, and replenish water regularly to maintain soil moisture.

[0055] After culturing for 45 days, soil samples were collected to determine the residual amount of DEHP in the soil, and the removal rate of DEHP in the soil was calculated according to the initial concentration of DEHP pollution in the soil ( image 3 ).

[0056] Depend on image 3 It can be seen that the soil DEHP pollution has a significant remediation effect after returning to the field. After returning to ...

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Abstract

The invention belongs to the technical field of soil restoration, and particularly relates to a method for restoring farmland soil phthalic acid ester pollution by applying green manure plants. Comprising the following steps: loosening and leveling polluted soil to be repaired; planting medicago sativa or vicia villosa in the polluted soil, and adding crushed fresh medicago sativa or vicia villosa; and detecting the content of PAEs in the repaired polluted soil. The method disclosed by the invention can be organically combined with agricultural production activities, and is environment-friendly, economical and easy to implement; the alfalfa and the vicia villosa stems and leaves contain rich organic matters and mineral nutrients, and provide a carbon source and a co-metabolism substrate for soil microorganisms after being turned and pressed into a field, so as to promote the degradation of PAEs pollution in the soil; meanwhile, the alfalfa and the vicia villosa can be used as clean organic fertilizers, so that the soil fertility can be improved while the effect of repairing PAEs pollution of the soil is achieved; the total concentration range of six PAEs compounds in farmland soil in China is 0.03-6.29 mg / kg, and the method is suitable for repairing PAEs pollution in most farmland soil in China.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for using green manure plants to remediate phthalate contamination of farmland soil. Background technique [0002] Phthalates (PAEs) are mainly used as plasticizers, solvents, additives, etc., and the global annual use reaches 8 million tons. Due to the extensive use of agricultural films, fertilizers and pesticides, as well as atmospheric deposition, sewage irrigation and other factors, PAEs have become one of the most common semi-volatile organic pollutants in farmland soils in my country. [0003] The remediation methods of PAEs pollution in soil mainly include physical and chemical remediation, phytoremediation and microbial remediation. my country's arable land resources are scarce, and the core goal of arable land pollution control is to achieve an effective combination of soil pollution control and agricultural production. Compared with phys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
CPCB09C1/105
Inventor 程金金余向阳冯发运陈小龙万群
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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