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Method for in-situ remediation of soil phthalate pollution by utilizing mushroom dregs and alfalfa

An in-situ remediation, phthalate ester technology, applied in the field of soil remediation, can solve problems such as lack of remediation means, and achieve the effect of increasing organic matter content, environmental pollution, and enhanced biodegradation

Active Publication Date: 2020-03-17
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the current in-situ bioremediation of phthalate-contaminated soil has received continuous attention from the environmental community, it is limited by considerations of technology, cost and many other factors, coupled with many uncertainties in the field environment, especially for large-scale farmland soil traces. Therefore, inventing a method that can effectively degrade soil phthalates is an effective means to reduce the ecological risk of phthalates polluting soil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Taking DBP and DEHP as PAEs representatives, artificially polluted soil was prepared, and the content of the two phthalates in the soil was 50 mg / kg (dry soil). Adjust the soil water content to 70% of the maximum water holding capacity in the field, and keep it stable at room temperature for 1 week.

[0027] According to the weight ratio, mix the fungus residue (74%) formed after the production of shiitake mushrooms, supplemented with dry cow dung (20%), superphosphate (5%), quicklime (1%), etc., and then use 7.5t / hm 2 Apply evenly to the above-mentioned phthalate-containing contaminated soil, and keep the field water content at 65% of the maximum water holding capacity. Keep at room temperature for 65 days. Take the same polluted soil without any treatment and only adjust the water to 65% of the maximum water holding capacity as the control.

Embodiment 2

[0029] Adjust the water content of the above-mentioned artificially prepared contaminated soil to 65% of the maximum water holding capacity in the field, and keep it at room temperature for 2 weeks.

[0030] Alfalfa growing to a height of 15-20 cm was transplanted into the above-mentioned polluted soil with a row spacing of 50 cm and a plant spacing of 30 cm. The soil moisture content was kept at 65% of the maximum water holding capacity in the field, and cultivated at room temperature for 50 days for harvest. Take the same polluted soil without any treatment and only adjust the water to 65% of the maximum water holding capacity as the control.

Embodiment 3

[0032] The method of applying bacterial residue to polluted soil is: according to the weight ratio, the bacterial residue (74%) formed after the production of shiitake mushrooms is supplemented with dry cow dung (20%), superphosphate (5%), quicklime (1%), etc. Stir evenly, then use 7.5t / t / hm 2 Apply evenly to phthalate-contaminated farmland soil, and keep the field water content at 65% of the maximum water holding capacity for 2 weeks.

[0033] The method of transplanting alfalfa is: transplant the alfalfa growing to a height of 15-20 cm into the polluted soil that has been applied with the above fungus residue at a row spacing of 50 cm and a plant spacing of 30 cm, and continue to keep the soil water content equal to the maximum water holding capacity in the field. 65%, cultivated at room temperature for 50 days and harvested. Take the same polluted soil without any treatment and only adjust the water to 65% of the maximum water holding capacity as the control. The control...

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Abstract

A method for in-situ remediation of soil phthalate pollution by utilizing mushroom dregs and alfalfa is disclosed. The method includes (1) a step of mushroom dreg treatment, namely a step of air dyingwaste mushroom dregs after shiitake harvesting, crushing, and sieving the crushed dregs with a sieve having a size of 1-2 cm, wherein raw materials of the waste mushroom dregs of shiitake comprise 75-85% of sawdust, 10-15% of wheat bran, 5-10% of corn flour, 0.5-1% of gypsum powder, 1-1.5% of calcium superphosphate and 0.5-1% of sugar. The waste mushroom dregs after the shiitake is harvested areadopted as the main raw material, and pollutant decomposition capability of residual fungus hyphae in the dregs and a characteristic that alfalfa belonging to leguminous plants can form root nodule symbiont easily so as to form a unique root microenvironment are utilized to accelerate biological decomposition of phthalate in the soil. In addition, by applying the waste mushroom dregs to polluted soil, the content of organic matters in soil can be increased, the living environment of soil microbes is improved, and pollutant decomposition capability of indigenous microorganisms is improved.

Description

technical field [0001] The invention relates to a method for remediating soil, in particular to a method for in situ remediating soil phthalate pollution by utilizing fungus residue and alfalfa. Background technique [0002] Phthalate Esters (PAEs), as an important class of synthetic compounds, are widely used in various industries. According to the report of China Plastics Processing Industry Association, the average annual consumption of phthalates in my country has reached more than 22 million tons. With the massive input of artificial chemicals in the soil and the rapid development of facility agriculture, especially the widespread application of plastic agricultural film, there have been reports of farmland soil being polluted by phthalates in Guangzhou, Shenzhen, Harbin, Handan and other places. Ester has become one of the common organic pollutants in farmland soil, which poses a greater risk to the safety of agricultural products and human health. The United States ...

Claims

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Application Information

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IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 高军
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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