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Method for treating heavy metals in living garbage by using crop stalks and lawn plants

A technology for crop straws and household garbage, applied in the field of environmental pollution remediation engineering, can solve the problems of deterioration of groundwater quality, high biological toxicity, accelerated accumulation of heavy metals in lawn plants, etc.

Inactive Publication Date: 2007-11-21
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it also has disadvantages: large amount of domestic waste composting, low nutrient content, long-term use will easily cause soil compaction and groundwater quality deterioration, and the toxicity of heavy metals has also received widespread attention. Heavy metal pollutants are stable in the environment and have high toxicity to organisms.
With the deepening of research, we have discovered new problems. The phytoremediation of complexing agent (EDTA) can not only improve the absorption and accumulation of heavy metals in plants, but also accelerate the process of heavy metals flowing into the environment and change the physical and chemical properties of soil. Problems, such as the rapid infiltration of heavy metals into groundwater, aggravating water pollution, etc.
[0006] In view of the above problems, the present inventors have found through a large number of studies that in the waste composting matrix polluted by heavy metals, the application of a certain amount of natural ingredients—crop straw can accelerate the accumulation of heavy metals in the matrix by lawn plants, while related Research and discussion in this aspect have not been reported in the literature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Sieve and select (1 cm × 1 cm sieve) waste compost from Tianjin Xiaodian Waste Treatment Plant into an oven, and dry it to constant weight at 80°C to prepare as a lawn plant culture substrate .

[0058] (2) Put corn stalks, rice straws or soybean stalks into an oven, dry them at 50°C until they reach a constant weight (about 24 hours), and then crush them with a pulverizer to prepare straw powders for use as compounding materials.

[0059] (3) The amount of garbage composting is 30g, and the culture container is a petri dish with a diameter of 10cm. The dosages of the three kinds of crop straw powders (corn straw, rice straw or soybean straw) were all: 1, 2, 3, 4, 5 or 6 g / dish, and the straw and the substrate were evenly mixed. The ICP-AES method was used to analyze the content of seven heavy metals in the matrix background, Cr, Mn, Ni, Cu, Zn, Cd, and Pb.

[0060] (4) Sow tall fescue or perennial ryegrass evenly on the lawn plant culture medium, the seed sowing ...

Embodiment 2

[0063] (1) Sieve and select (1 cm × 1 cm sieve) the garbage compost from Xiaodian Garbage Treatment Plant in Tianjin, put it in an oven, and dry it to constant weight at 80°C to prepare for lawn plant cultivation matrix.

[0064] (2) Put rice straw into an oven, dry it at 50° C. to a constant weight (about 24 hours), and then pulverize it with a pulverizer to prepare straw powder for use as a compounding material.

[0065] (3) The amount of garbage composting is 40g, and the culture container is a petri dish with a diameter of 10cm. The dosage of rice straw powder is 6g / dish, and the straw and the matrix are evenly mixed. The ICP-AES method was used to analyze the content of seven heavy metals in the matrix background, Cr, Mn, Ni, Cu, Zn, Cd, and Pb.

[0066] (4) Perennial ryegrass is evenly sown on the lawn plant culture substrate, the seed sowing rate is 100, repeat 3 times, the light is natural light injected into the room, the light intensity is 2600lx, the temperature i...

Embodiment 3

[0069] The method is the same as in Example 2, except that the amount of composting is 80g, the amount of rice straw powder is 10g / dish, and the straw and substrate are evenly mixed. The ICP-AES method was used to analyze the content of seven heavy metals in the matrix background, Cr, Mn, Ni, Cu, Zn, Cd, and Pb. Others are with embodiment 2.

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Abstract

The invention is concerned with the application method that uses the straw and the lawn plant to recover the housing refuse with heavy metal, it is: the 10 to 80 of housing refuse compost mix with 1 to 10 of straw to make the lawn plant culture substrate, seeds on the lawn plant culture substrate and give water every day, uses the ICP-AES method to test the heavy metal content after distilling by the lawn plant from cradle the upside of the lawn plant; the result shows with the paddy straw, the recover actuation of the Cr, Ni and Cd by the secular-grow ryegrass, and the recover actuation of the Cr and Ni by festuca arundinacea are big foreground.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution restoration engineering, and relates to the composting treatment of urban domestic waste, and more specifically relates to a lawn plant culture substrate for repairing heavy metals in domestic waste and an application method for repairing heavy metals in domestic waste by using crop straws in cooperation with lawn plants. Background technique [0002] With the expansion of city scale, the output of municipal waste is increasing day by day. The pollution caused by municipal solid waste (hereinafter referred to as garbage composting) has become a worldwide serious environmental problem. Due to the fact that most of the urban waste in our country has not been classified and collected, a large amount of electronic waste has entered the landfill, resulting in serious heavy metal pollution in the landfill. On the one hand, the heavy metals in the garbage pollute the dump site and the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G31/00A01G1/00C05F17/00B09B3/00
CPCY02W30/40
Inventor 多立安赵树兰
Owner TIANJIN NORMAL UNIVERSITY
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