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Method for repairing heavy metal soil through sedum alfredii hance with assistance of alternating current electric field

A technology of alternating electric field and heavy metals, which is applied in the field of multi-technology joint treatment of environmental pollution, can solve the problems of expensive production, limitations of electric-phytoremediation devices, etc., and achieve the effect of improving migration efficiency and repair efficiency

Inactive Publication Date: 2016-08-10
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, most of the existing electrokinetic-phytoremediation devices are limited to laboratory use, and are affected by factors such as expensive production and special materials (graphite electrodes are generally used in laboratories), so it is difficult to extend this technology to field fields conduct experiment

Method used

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  • Method for repairing heavy metal soil through sedum alfredii hance with assistance of alternating current electric field
  • Method for repairing heavy metal soil through sedum alfredii hance with assistance of alternating current electric field

Examples

Experimental program
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Effect test

Embodiment 1

[0027] 1. Experimental materials and venue:

[0028] (1) Soil for test: collected from a soil heavily polluted by heavy metals around a small blast furnace in Huanshan Township, Fuyang City, Zhejiang Province (hereinafter referred to as "Fuyang soil"). Air-dried, passed through a 5mm sieve for later use.

[0029] The background content of heavy metals in the test soil is as follows: the total heavy metal content is: total Cu is 1183.48 mg / kg, total Zn is 2403.15 mg / kg, total Pb is 817.75 mg / kg, and total Cd is 13.15 mg / kg. The heavy metal contents are as follows: the effective content of Cu is 768.73mg / kg, the effective content of Zn is 1140.36mg / kg, the effective content of Pb is 515.01mg / kg, and the effective content of Cd is 2.61mg / kg.

[0030] (2) Test plants: Sedumalfredii Hance, a heavy metal hyperaccumulation plant taken from an ancient lead-zinc mine in Quzhou City, Zhejiang Province, was artificially selected as test materials;

[0031] (3) Test equipment: TDGC2-0.5...

Embodiment 2

[0047] This embodiment is the same as the experimental material and site, test preparation and sample collection in Example 1, and adopts the mode of intermittent pressure, the only difference is: after energizing with a voltage intensity of 1V / cm for 4h, stop energizing for 1h, Then energize with a voltage intensity of 0.8V / cm for 3 hours; every 3 days, stop energizing for 1 day, and energize for 30 days in total, and the total energizing time is the same as that of Example 1.

Embodiment 3

[0049] This example is the same as the experimental material and site, test preparation and sample collection in Example 1, and adopts the mode of intermittent pressure application, the only difference is: before and after the intermittent pressure application, the voltage remains the same, both are 0.5V / cm , the total power-on time is the same as in Example 1.

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Abstract

The invention discloses a method for repairing heavy metal soil through sedum alfredii hance with the assistance of an alternating current electric field. The method comprises the steps that sedum alfredii hance plants are selected, an organic material serves as a base fertilizer, and the sedum alfredii hance plants are transplanted to the to-be-repaired soil; the organic material comprises, by weight, 100 parts of peat soil, 50-75 parts of soymeal slag, 15-20 parts of coconut coir, 10-15 parts of carbonized rice hulls and 12-16 parts of lees; and an alternating current is applied into the to-be-repaired soil, the voltage strength is 0.4-1.1 V / cm, the energizing time lasts for 15-20 days, and energizing is conducted for 5-8 h every day. According to the method for repairing the heavy metal soil through the sedum alfredii hance with the assistance of the alternating current electric field, the alternating current specific in voltage strength and energizing time is applied into the heavy metal soil and is matched with the specific organic material to assist the sedum alfredii hance plants in repairing the heavy metal soil, the migration efficiency of heavy metal in the soil can be significantly improved, and the amount of the heavy metal accumulated through the over-ground part of the plant can be significantly increased, so that the repairing efficiency of the heavy metal soil is improved.

Description

technical field [0001] The invention relates to the technical field of multi-technical joint treatment of environmental pollution, in particular to a method for using an AC electric field to assist sedum sedum to restore heavy metal soil. Background technique [0002] At present, the methods of soil pollution remediation mainly include physical and chemical remediation methods and biological remediation methods; for example, traditional soil replacement method, chemical leaching and biological remediation. These methods are difficult to remediate large-area heavy metal-contaminated soil due to defects such as high cost, easy to cause secondary pollution, or damage to soil structure. [0003] Although phytoremediation is green and environmentally friendly, it is difficult for most heavy metals to move to the rhizosphere of hyperaccumulative plants in a targeted manner, and it is difficult to maintain the repair efficiency continuously. Although the single electrodynamic repa...

Claims

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Application Information

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IPC IPC(8): B09C1/10B09C1/08B09C1/00
CPCB09C1/00B09C1/085B09C1/105B09C2101/00
Inventor 叶正钱柳丹姚桂华马嘉伟胡杨勇赵科理王海龙
Owner ZHEJIANG FORESTRY UNIVERSITY
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