Method for improving phytoremediation efficiency of low-concentration arsenic-contaminated soil

A phytoremediation and soil remediation technology, applied in the field of ecological restoration of pollution and phytoremediation of low-concentration arsenic-contaminated farmland soil

Inactive Publication Date: 2010-05-12
吴江市土壤肥料技术指导站
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems existing in the current restoration of low-concentration arsenic-contaminated soil, the present invention proposes a method for improving the efficiency of phytoremediation of low-arsenic-contaminated soil. The method promotes plant growth and improves the soil environment, thereby promoting the plant absorption and loss of arsenic, and then To achieve the purpose of improving the efficiency of phytoremediation of low-concentration arsenic-contaminated soil

Method used

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  • Method for improving phytoremediation efficiency of low-concentration arsenic-contaminated soil

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Experimental program
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Effect test

Embodiment 1

[0018] Propagation of AM mycorrhizal fungi: the tested AM mycorrhizal fungus is a high-efficiency composite bacterial agent composed of Glomus spp. and Acaulosporaspp that promotes the absorption of arsenic by plants. Sudan grass (Sorghum sudanese (Piper) Stapf.) is used in summer and clover is used for propagation in winter, and the substrate is river sand; The rhizosphere soil that infects propagules such as root segments is the compound bacterial agent inoculum.

Embodiment 2

[0020] Soil for test: collected in Lili Town, Wujiang City, Jiangsu Province, the physical and chemical properties of the soil are: organic matter 20.90g.kg -1 , all N 1.27g.kg -1 , all P 0.31g.kg -1 , effective K 87.13mg.kg -1 , pH 6.2 (1:2.5 water extraction).

[0021] Mix the above soil evenly, and breed mycorrhizal seedlings and non-mycorrhizal seedlings of corn indoors. Corn mycorrhizal seedlings: Add AM mycorrhizal fungus compound bacterial agent to the soil below the corn seeds by layer application; non-mycorrhizal seedlings are layered with inactivated bacterial agent 50g, and transplanted after 2 weeks of seedling cultivation.

Embodiment 3

[0023] General situation of the test area: The test area is located in Lili Town, Wujiang City, Jiangsu Province, the key pollution element: As: 31.2 mg / kg, and the physical and chemical properties of the soil are the same as in Example 2.

[0024] Experimental scheme: 4 treatments were designed in this study: no inoculation control (CK), inoculation of earthworms (E), inoculation of AM fungi (M), inoculation of AM fungi and earthworms (EM), 3 replicates for each treatment, 10m for each plot 2 , arranged randomly. The corn seedlings were transplanted in April, and the corn spacing was 40cm×40cm. When transplanting, the control treatment and the earthworm treatment were transplanted with non-mycorrhizal seedlings, and the other treatments were transplanted with mycorrhizal seedlings. For the treatment of inoculation of AM bacterial agent, 50 g of bacterial agent was added to the seedling holes before transplanting; for the treatment of inoculation of earthworms, some crushed s...

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Abstract

The invention discloses a method for improving the phytoremediation efficiency of low-concentration arsenic-contaminated soil, which comprises the steps of: planting corns in an arsenic-contaminated farmland, inoculating arbuscular mycorrhizal fungi and earthworms, pulling up the corns with roots after the growth season of the corn is over, harvesting the corns wholly, and performing centralized treatment. The method fully exploits the potentials of arsenic remediation of plants, microorganisms and animals, and inoculates the AM fungi and the earthworms to promote the plant absorption and dissipation of arsenic by promoting the growth of the plants, improving the activity of phosphatase of the soil and activating the arsenic in the soil to further achieve the aim of improving the phytoremediation efficiency of the low-concentration arsenic-contaminated soil. The method combines the microorganisms, the animals and the plants together for the in-situ remediation of the arsenic-contaminated farmland, has simple and convenient operation and friendly operating environment, cannot cause secondary pollution, reduces the treatment cost, and has good environmental effect.

Description

1. Technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a pollution ecological restoration technology, in particular to a method for phytoremediation of low-concentration arsenic-polluted farmland soil. 2. Background technology [0002] Research on remediation of heavy metal-contaminated soil is attracting widespread attention at home and abroad, and bioremediation of heavy metal-contaminated soil is the focus of public attention, and arsenic-contaminated soil is no exception (Xia Yunsheng et al., 2008; LiaoX Y et al., 2005; Chen T B et al., 2006;). Arsenic is a metalloid that is widely distributed in nature and highly toxic. Various arsenic pollutants can cause acute, subacute and chronic arsenic poisoning to varying degrees, and can also induce skin cancer, lung cancer and bladder cancer (Badal K M et al., 2002;). In recent years, adverse environmental problems caused by arsenic pollution in Xinjiang, Inner Mongo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00A01G1/00A01G7/06
Inventor 尹睿沈生元林先贵肖艳平张伟秋严大富蔡后虎白建锋李江元邵玉芳莫美英穆利明陈雪明王天荣费庆华徐晓波吴福官吴美芳罗成定朱福官丁海红韩国新李新奇许兴根许建华史东英徐红梅陈文华沈耀明秦淑平周虹杰栋枫柳敏徐燕
Owner 吴江市土壤肥料技术指导站
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