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Method for preventing heavy metal in sludge matrix from being leaked by adoption of interlayer of fly ash and biochar

A technology of biochar and fly ash, which is applied in botany equipment and methods, sludge treatment, chemical instruments and methods, etc., and can solve the problems of difficulty in preparation and high price

Inactive Publication Date: 2015-04-22
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, heavy metals in sludge are limiting factors for its safe utilization
[0005] In recent years, although soilless cultivation technology has developed rapidly in various fields of agricultural cultivation, its application in turf production is still in the research stage
In addition, the existing soilless culture nutrient solution is not only difficult to prepare, but also expensive

Method used

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  • Method for preventing heavy metal in sludge matrix from being leaked by adoption of interlayer of fly ash and biochar
  • Method for preventing heavy metal in sludge matrix from being leaked by adoption of interlayer of fly ash and biochar
  • Method for preventing heavy metal in sludge matrix from being leaked by adoption of interlayer of fly ash and biochar

Examples

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Effect test

Embodiment 1

[0065] Composition of fly ash and biochar interlayer to prevent heavy metal leakage from sludge matrix: 40 sludge; 10 biochar; 50 fly ash.

[0066] The method of using fly ash and biochar interlayer to prevent the leakage of heavy metals in sludge matrix:

[0067] (1) First mix the sludge, biochar, and fly ash according to the above weight ratio and stir evenly, then, the mixed matrix is ​​evenly put into PVC pipes, each pipe is 24 cm high and 7.5 cm in diameter, and each PVC pipe is loaded into The total amount of matrix is ​​850 g, the upper 8 cm is 350 g of mixed matrix of sludge biochar and fly ash, and the lower 16 cm is 500 g of garden soil;

[0068] (2) Plant 0.6 g of ryegrass seeds per PVC, soak Cui buds before planting the seeds, and regularly water the same amount during the planting period to keep the overall field water holding capacity at 60%. The indoor temperature and relative humidity during the planting period were respectively at 25°C and 36-%, the light int...

Embodiment 2

[0073] A fly ash and biochar interlayer for preventing heavy metal leakage from the sludge matrix is ​​characterized in that it is composed of the following raw materials by weight fraction:

[0074] 40 sludge; 10 biochar; 50 fly ash.

[0075] The method of using fly ash and biochar interlayer to prevent the leakage of heavy metals in sludge matrix:

[0076] (1) First mix the sludge, biochar, and fly ash according to the above weight ratio and stir evenly, then, the mixed matrix is ​​evenly put into PVC pipes, each pipe is 24 cm high and 7.5 cm in diameter, and each PVC pipe is loaded into The total amount of matrix is ​​850 g, the upper 8 cm is 350 g of mixed matrix of sludge biochar and fly ash, and the lower 16 cm is 500 g of garden soil;

[0077] (2) Plant 0.6 g of ryegrass seeds per PVC, soak Cui buds before planting the seeds, and regularly water the same amount during the planting period to keep the overall field water holding capacity at 60%. The indoor temperature an...

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Abstract

The invention discloses a method for preventing heavy metal in a sludge matrix from being leaked by adoption of an interlayer of fly ash and biochar. The interlayer of the fly ash and the biochar preventing the heavy metal in the sludge matrix from being leaked comprises, by weight, 40-70 parts of sludge, 5-10 parts of the biochar and 25-50 parts of the fly ash. Artificial soil which is prepared by the fly ash, the biochar and the sludge can meet needs of growing of ryegrass and improve a physicochemical environment of the sludge so that the growth of the ryegrass is good, and nutrients of the ryegrass has the effect of slow release. The proportion of the fly ash has larger influence on the content of the heavy metal in the ryegrass and leakage solution, the growth of the ryegrass in the artificial soil which comprises 50% of the fly ash and 10% of the biochar is the best, the content of plumbum, chromium, cadmium, zinc and copper in the ryegrass is the lowest, so that the contribution of the method to reduction of the heavy metal is large.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to the research on complexing agent-enhanced phytoremediation of polluted soil, in particular to a method for preventing heavy metal leakage in sludge matrix by using fly ash and biochar 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. At present, the main disposal methods of sludge at home and abroad include sanitary landfill, incineration, reclamation, land utilization, etc. Among th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01G1/00C05G3/00C02F11/00
Inventor 多立安赵树兰沈志平
Owner TIANJIN NORMAL UNIVERSITY
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