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Method for repairing sludge heavy metal by combination of DTPA and ryegrass

A heavy metal and ryegrass technology, applied in biological sludge treatment, botany equipment and methods, horticulture, etc., can solve the problems of high heavy metals and secondary pollution of the environment

Inactive Publication Date: 2013-09-04
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Municipal sludge is rich in nutrients and can be used as fertilizer, but the content of heavy metals in the sludge is too high. If it is to be used in practice, the heavy metals in it must be removed to avoid secondary pollution to the environment

Method used

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  • Method for repairing sludge heavy metal by combination of DTPA and ryegrass
  • Method for repairing sludge heavy metal by combination of DTPA and ryegrass
  • Method for repairing sludge heavy metal by combination of DTPA and ryegrass

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Experimental program
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Effect test

Embodiment 1

[0054] The corncob interlayer is characterized in that it is composed of 40g vermiculite+40g zeolite+40g corncob.

[0055] The method for repairing heavy metals in sludge by DTPA combined with ryegrass is characterized in that it proceeds in the following steps:

[0056] (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;

[0057] (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;

[0058] (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%; Intensity of 450 μmol?m -2 ?s -1 ;

[0059] (4) 30 days...

Embodiment 2

[0062] The corncob interlayer is characterized in that it is composed of 40g vermiculite+60g zeolite+100g corncob.

[0063] The method for repairing heavy metals in sludge by DTPA combined with ryegrass is characterized in that it proceeds in the following steps:

[0064] (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;

[0065] (2) Add an interlayer between the PVC pipe garden soil and the mixed matrix; the interlayer is composed of 40g vermiculite+60g zeolite+100g corn cob;

[0066] (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%; during the planting period, the indoor temperature and relative ...

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Abstract

The invention discloses a method for repairing sludge heavy metal by combination of DTPA and ryegrass. According to the method, DTPA of different concentrations serving as chelating agents is combined with the ryegrass and a corn interlayer to improve enrichment of heavy metal on the upper portion of a ryegrass land and to restrain the ability of the sludge heavy metal to move to deep soil in a leaching mode. The corn interlayer comprises 40-60g of vermiculite, 40-80g of zeolite and 40-100g of corncobs. According to the method, sludge and soil mixed substrate serves as culture substrate of the ryegrass, when turfgrass grows to a certain stage, DTPA is used, rainfall and pH of TianJin are simulated for leaching, and the content of the heavy metal in the upper portion of the ryegrass land and in leaching solutions is tested. As is shown in an experiment result, a combination of 10mmol.kg-1 DTPA and the interlayer comprising the corncobs has the best repairing effect on the heavy metal in the sludge, repairing cost is low and pollution to underground water is least.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to the research of complexing agent strengthening turf plants to restore heavy metals in sludge, in particular to a method for repairing heavy metals in sludge by using DTPA combined with ryegrass and an interlayer. Background technique [0002] With the acceleration of my country's urbanization process and the increase of urban population, the discharge of urban domestic sewage is increasing day by day, and the output of sludge is also increasing rapidly accordingly. According to statistics, my country currently has more than 420 sewage treatment plants in operation, with an annual treatment capacity of 11.36 billion tons and an annual output of more than 1.3 million tons of dry sludge, which is increasing at a rate of 10% per year. In 1999, the UK's sludge output was about 1.2 million tons, and by 2006 it will grow to 2.18 million tons. The United States produces a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G1/00C02F11/02
Inventor 多立安赵树兰沈志平
Owner TIANJIN NORMAL UNIVERSITY
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