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Method for remediation of sludge leacheate heavy metals by use of lolium perenne

A technology of ryegrass and eluent, applied in the restoration of contaminated soil, etc., can solve the problem of low dissolution rate

Inactive Publication Date: 2014-11-05
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the secondary treatment of sewage, more than 50% of the heavy metal ions in the sewage are transferred to the sludge, which becomes a bottleneck affecting the agricultural use of sludge composting

Method used

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  • Method for remediation of sludge leacheate heavy metals by use of lolium perenne
  • Method for remediation of sludge leacheate heavy metals by use of lolium perenne
  • Method for remediation of sludge leacheate heavy metals by use of lolium perenne

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Experimental program
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Effect test

Embodiment 1

[0060] The corncob interlayer is characterized in that it is composed of 40g vermiculite+40g zeolite+40g corncob.

[0061] (1) In the PVC pipe, the lower end is sealed with cotton cloth and nylon mesh, filled with 1000g of air-dried garden soil, paved, and then filled with 750g of mixed matrix; the mixed matrix refers to: sludge: weight of garden soil The ratio of parts is 1:2, and the sludge is spread on the garden soil;

[0062] (2) Add an interlayer between the PVC pipe garden soil and the mixed matrix; the interlayer is composed of 40 g vermiculite + 40 g zeolite + 40 g corn cob;

[0063] (3) Sow 1.0 g of ryegrass seeds in PVC pipes, irrigate with tap water, supply water normally during the cultivation period, and keep the overall field water holding capacity at 60%; 500 μmol?m -2 ?s -1 ;

[0064] (4) 30 days after sowing ryegrass, the concentration of 10-20 mmol·kg -1 DTPA was dissolved in distilled water and applied to the surface of the mixed substrate once; then...

Embodiment 2

[0068] The corncob interlayer is characterized in that it is composed of 40g vermiculite+60g zeolite+100g corncob.

[0069] The method for repairing heavy metals in sludge by DTPA combined with ryegrass is characterized in that it proceeds in the following steps:

[0070] (1) In the PVC pipe, the lower end is sealed with cotton cloth and nylon mesh, filled with 1000g of air-dried garden soil, paved, and then filled with 750g of mixed matrix; the mixed matrix refers to: sludge: weight of garden soil The ratio of parts is 1:2, and the sludge is spread on the garden soil;

[0071] (2) Add an interlayer between the PVC pipe garden soil and the mixed substrate; the interlayer is composed of 40 g vermiculite + 40 g zeolite + 100 g corn cob;

[0072] (3) Sow 1.0 g of ryegrass seeds in PVC pipes, irrigate with tap water, and supply water normally during the cultivation period to keep the overall field water holding capacity at 60%; 600 μmol?m -2 ?s -1 ;

[0073] (4) 30 days after...

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Abstract

The invention discloses a method for remediation of sludge leacheate heavy metals by use of lolium perenne. According to the method disclosed by the invention, by adopting DTPA with different concentrations as a chelating agent and in cooperation with lolium perenne and a corn separation layer, the enrichment of heavy metals at the overground part of lolium perenne is improved, and the leaching transfer ability of the heavy metals into deep soil is inhibited. The corn separation layer consists of 40-60g of vermiculite, 40-80g of zeolite and 40-100g of corncob. The experimental result indicates that lolium perenne cultured by leacheate has different degrees of enrichment effect on Cd, Cr, Cu, Zn and Pb, and enrichment at the root part is higher than that at the overground part; and the ability of Zn transferring from the root part to the overground part is the strongest among the 5 heavy metals. Lolium perenne has a certain practical application value in the remediation of air-dried sludge leacheate and particularly the remediation of Zn in leacheate.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a technology for complexing agents to strengthen plants to repair heavy metals in sludge, in particular to a method for using ryegrass to repair heavy metals in sludge eluent. Background technique [0002] Phytoremediation is an emerging method of using green plants to absorb pollutants in polluted soil, silt and sediments. It is a cost-effective, environmentally friendly and suitable for mild Bioremediation of moderately to moderately polluted soils. According to its mechanism of action, the phytoremediation technology of heavy metal-contaminated soil can be divided into three types: (1) phytostabilization; (2) phytovolatilization; (3) phytoextraction. During the growth of plants, the roots secrete a large amount of organic acids, which can activate heavy metals and affect the bioavailability of heavy metals. Municipal sludge is usually added to the soil in the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 多立安赵树兰沈志平
Owner TIANJIN NORMAL UNIVERSITY
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