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Biological combined remediation method for heavy metal contaminated soil in acid diggings

A technology of polluted soil and joint remediation, applied in the field of soil remediation, can solve problems such as unsuitable direct planting of crops, poor quality environment, etc., and achieve the effect of avoiding secondary pollution problems, being extremely easy to obtain, and improving soil quality.

Active Publication Date: 2015-11-25
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Heavy metal polluted soil in acid mining areas has poor quality and environment problems, and is not suitable for direct planting of crops
Therefore, before phytoremediation, it is necessary to carry out preliminary soil improvement on the contaminated soil in mining areas. At present, there is no effective remediation plan for heavy metal contaminated soil in mining areas.

Method used

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  • Biological combined remediation method for heavy metal contaminated soil in acid diggings
  • Biological combined remediation method for heavy metal contaminated soil in acid diggings
  • Biological combined remediation method for heavy metal contaminated soil in acid diggings

Examples

Experimental program
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Effect test

Embodiment 1

[0033]1. Preparation of grain amaranth seedlings: grain amaranth is the introduced American grain amaranth K472, purchased from Dijing Landscaping Engineering Co., Ltd. Seeds of amaranth were cultured in a biochemical incubator (Pearl River, LRH-250A) at 25°C for 12 hours, and then sowed into seedling pots (specifications: aperture 5 cm, depth 8 cm). The seedling pots were placed in the greenhouse (average room temperature 30°C) and cultivated for 10 days. When the seedlings grew to about 10cm and the number of leaves was 5 pieces, the seedlings with strong and consistent growth were selected and transplanted into plastic flowerpots (mouth diameter 19cm, bottom diameter 14cm , 15cm high).

[0034] 2. Earthworm: Choose Zhuangwei Ringworm Amynthas robustus (referred to as strong tail) and Eisenia chinensis Eisenia fetida (Chiziai for short) is an earthworm for testing, Eisenia foetida selected from artificial breeding plants; Amynthas robustus It is a local species in So...

Embodiment 2

[0045] Effect of different treatments of embodiment 2 on the plant height of grain amaranth

[0046] Experimental method is with embodiment 1, and result is as figure 1 It was shown that the plant height of grain amaranth with different treatments began to be different at the second week, and the difference continued to widen with time (P figure 2 It is the plant height of grain amaranth with different treatments at the end of the two-month cultivation. From the figure, compared with group P, simply adding earthworms or straw (PE, PL, SA groups) could significantly increase the plant height of grain amaranth, and the plant height increased by 23-30% and 96%, respectively. The grain amaranth treated by SPE group grew the highest, which was 130% higher than that of P group. The effects of different treatment groups are: SPE>SPL, SA>PE, PL.

Embodiment 3

[0047] Effect of different treatments of embodiment 3 on dry weight of aboveground part of grain amaranth

[0048] Experimental method is with embodiment 1, and result is obtained by image 3 It was shown that, compared with the P group, simply adding earthworms or straw (PE, PL, SA groups) could significantly increase the dry weight of the aboveground part of amaranth grains, which increased by 90-94% and 382%, respectively. The shoot of amaranth treated with SPE was the heaviest, which was 477% higher than that of P group. The effect of different treatment groups is: SPE>SA>SPL>PE, PL.

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Abstract

The invention relates to the technical field of soil remediation, in particular to a biological combined remediation method for heavy metal contaminated soil in acid diggings. The method is applied to soil with the heavy metal exceeding the standard due to pollution by acid wastewater of the diggings. The method includes the steps that grain amaranth seedlings are transplanted to the heavy metal contaminated soil mixed with smashed straw, after grain amaranths grow stably, earthworms are inoculated to the heavy metal contaminated soil, and the grain amaranths are removed after being cultured for 45 to 60 days. A manner for using the earthworms, the straw and the grain amaranths for combined remediation is adopted, compared with a traditional plant remediation manner, remediation efficiency is improved, the quality of the soil can be remarkably improved, and the method has the wide application value in remediation of the heavy metal contaminated acid soil in China.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a bio-combined remediation method for heavy metal-contaminated soil in an acid mining area. Background technique [0002] With the rapid economic growth, the rapid development of industry and the modernization of agriculture, the problem of soil pollution is becoming more and more serious, especially heavy metal pollution has become a common environmental problem and has received more and more attention. Heavy metal pollution in soil in my country mainly comes from sewage irrigation, sludge application, mining and metal smelting. Studies have shown that the probability of heavy metal pollution in cultivated land soil in my country is 16.67%. Among the heavy metal pollution elements in soil, the probability of pollution caused by Cd element is the highest, which is 25.20%. Cd is a non-essential element for plants, and it has obvious toxic effects on most plants, causing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 黄钰婷戴军张池袁中友付雪仪袁嘉铭吴家龙周波张志超任宗玲代金君龙建亮瑟竞甘洋洋
Owner SOUTH CHINA AGRI UNIV
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