Method for controlling different forms of heavy metal in urban life compost by modified nano carbon

A nano-carbon and heavy metal technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problem of not many nano-carbons.

Inactive Publication Date: 2014-05-28
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] So far, there are not many studies on nano-carbon as a repair material to control environmental pollution, and there are only a few reports on the passivation of heavy metals in soil.

Method used

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  • Method for controlling different forms of heavy metal in urban life compost by modified nano carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] The method of regulating the different forms of heavy metals in urban life composting by modified nano-carbon is carried out according to the following steps:

[0080] (1) Handling of materials:

[0081] Before the experiment, the garbage compost was pretreated to remove large debris such as plastic films, bricks, stones, and glass. After air-drying, it was passed through a 2 mm sieve for later use; the physical and chemical properties of the garbage compost were: pH 7.62, organic matter content 221.25 g·kg -1 , total nitrogen 13.48 g·kg -1 , available phosphorus 0.078 g·kg -1 , C / N is 8.37, saturated water content is 0.76 mL·g -1 , bulk density 0.85 g·mL -1 ; The contents of heavy metals (Cr, Cu, Pb, Zn) were 67.00, 238.73, 172.11 and 496.38 mg·kg, respectively -1 ;

[0082] The plants are tall fescue ( Festuca arundinacea L . );

[0083] The particle size of nano carbon is 40nm, and the specific surface area is 1.2×10 5 m 2 kg -1 , with a pH value of 7,...

Embodiment 2

[0088] The method of regulating the different forms of heavy metals in urban life composting by modified nano-carbon is carried out according to the following steps:

[0089] (1) Handling of materials:

[0090] Before the experiment, the garbage compost was pretreated to remove large debris such as plastic films, bricks, stones, and glass. After air-drying, it was passed through a 2 mm sieve for later use; the physical and chemical properties of the garbage compost were: pH 7.62, organic matter content 221.25 g·kg -1 , total nitrogen 13.48 g·kg -1 , available phosphorus 0.078 g·kg -1 , C / N is 8.37, saturated water content is 0.76 mL·g -1 , bulk density 0.85 g·mL -1 ; The contents of heavy metals (Cr, Cu, Pb, Zn) were 67.00, 238.73, 172.11 and 496.38 mg·kg, respectively -1 ;

[0091] The plants are tall fescue ( Festuca arundinacea L . );

[0092] The nanocarbon particle size is 50 nm, and the specific surface area is 1.2×10 5 m 2 kg -1 , with a pH value of 7, wh...

Embodiment 3

[0097] The method of regulating the different forms of heavy metals in urban life composting by modified nano-carbon is carried out according to the following steps:

[0098] (1) Handling of materials:

[0099] Before the experiment, the garbage compost was pretreated to remove large debris such as plastic films, bricks, stones, and glass. After air-drying, it was passed through a 2 mm sieve for later use; the physical and chemical properties of the garbage compost were: pH 7.62, organic matter content 221.25 g·kg -1 , total nitrogen 13.48 g·kg -1 , available phosphorus 0.078 g·kg -1 , C / N is 8.37, saturated water content is 0.76 mL·g -1 , bulk density 0.85 g·mL -1 ; The contents of heavy metals (Cr, Cu, Pb, Zn) were 67.00, 238.73, 172.11 and 496.38 mg·kg, respectively -1 ;

[0100] The plants are tall fescue ( Festuca arundinacea L . );

[0101] The nanocarbon particle size is 70 nm, and the specific surface area is 1.2×10 5 m 2 kg -1 , with a pH value of 7, wh...

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Abstract

The invention discloses a method for controlling different forms of heavy metal in urban life compost by adopting modified nano carbon. Before application of nano carbon with diameters ranging from 20 nm to 70 nm, the nano carbon is modified, so that various kinds of modified nano carbon are obtained respectively; then, a layer of cotton cloth and a nylon net are sealed at the lower end of each PVC (polyvinyl chloride) tube, garbage compost and various kinds of modified nano carbon are proportionally and uniformly mixed, and each tube is filled with 150 g of mixed materials; the temperature during an experiment ranges from 19 to 27 DEG C, the relative humidity is 60%-72%, the compost is supplemented with water every day, so that the moisture of the compost is about 70% of the field capacity; sampling is performed after 45 days of cultivation, and form analysis of heavy metal is performed; and the adding amount of various kinds of modified nano carbon is 1%-5% (w/w) of the weight of the garbage compost. The experiment result shows that the content of the residual form heavy metal is added with addition of the modified nano carbon, conversion of the heavy metal in the compost from an easily absorbing state to a difficultly absorbing state is promoted, and a basis is provided for application of the modified nano carbon in passivation of the heavy metal in the garbage compost.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to urban afforestation, in particular to a method for regulating and controlling different forms of heavy metals in composting in urban life by modified nano-carbon. Background technique [0002] Carbon black is transformed from volatile components of biological or fossil raw materials during incomplete combustion or pyrolysis at high temperatures, and is a product of a gaseous process. Normally, carbon black is a porous nanomaterial with a diameter of 30-50 nm, a large specific surface area and high active sites. [0003] In the 1980s, the global annual production of carbon black was about 50-270Tg (Tg=10 12 g) or so, about 80% of which is due to combustion. Most of the black carbon directly enters the soil, accumulates gradually, and becomes an important component of soil organic matter, and the other part is blown into the atmosphere by the wind. Due to the inert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 赵树兰多立安贺璐
Owner TIANJIN NORMAL UNIVERSITY
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