Method for preventing enrichment of heavy metal in compost by combining modified nano carbon, turfgrass and chelating agent

A nano-carbon and heavy metal technology is applied in the field of urban greening, modified nano-carbon combined with turfgrass and chelating agent to block and enrich composting heavy metals, which can solve the problems of heavy metal passivation and repair that have not been reported in literature.

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

AI Technical Summary

Problems solved by technology

[0007] However, there is no literature report on the use of nano-carbon in lawn composting substrates to realize the passivation and repair of heavy metals.

Method used

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  • Method for preventing enrichment of heavy metal in compost by combining modified nano carbon, turfgrass and chelating agent
  • Method for preventing enrichment of heavy metal in compost by combining modified nano carbon, turfgrass and chelating agent
  • Method for preventing enrichment of heavy metal in compost by combining modified nano carbon, turfgrass and chelating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Modified nano-carbon combined with turfgrass and chelating agent to block and enrich heavy metals in compost:

[0085] (1) Handling of materials:

[0086] Before the experiment, the garbage compost was pretreated to remove the sundries, and after air-drying, it passed through a 2 mm sieve for later use; tall fescue ( Festuca arundinacea L . ); the nanocarbon particle size is 20 nm, and the specific surface area is 1.2×10 5 m 2 kg -1 , with a pH value of 7, which were modified before application to obtain KMnO 4 、H 2 SO 4 or HNO 3 Modified nano carbon;

[0087] The composition of artificial rainwater is (mg / L), NO 3 － :1.94; NH 4 + :0.49; Na + :1.87; Mg 2+ :0.25; Ca 2+ :0.29; Cl － :3.41; SO 4 2－ : 2.65; pH: 4.40;

[0088] (2) Experimental method:

[0089] 1) Design of turf substrate seepage system

[0090] The leaching experiment was carried out under natural light indoors. 63 g of sand was placed in a PVC pipe with a height of 25 cm and a diamete...

Embodiment 2

[0096] Modified nano-carbon combined with turfgrass and chelating agent to block and enrich heavy metals in compost:

[0097] (1) Handling of materials:

[0098] Before the experiment, the garbage compost was pretreated to remove the sundries, and after air-drying, it passed through a 2 mm sieve for later use; tall fescue ( Festuca arundinacea L . ); 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, which were modified before application to obtain KMnO 4 、H 2 SO 4 or HNO 3 Modified nano carbon;

[0099] The composition of artificial rainwater is (mg / L), NO 3 － :1.94; NH 4 +:0.49; Na + :1.87; Mg 2+ :0.25; Ca 2+ :0.29; Cl － :3.41; SO 4 2－ : 2.65; pH: 4.40;

[0100] (2) Experimental method:

[0101] 1) Design of turf substrate seepage system

[0102] The leaching experiment was carried out under natural light indoors. 63 g of sand was placed in a PVC pipe with a height of 25 cm and a diameter...

Embodiment 3

[0108] Modified nano-carbon combined with turfgrass and chelating agent to block and enrich heavy metals in compost:

[0109] (1) Handling of materials:

[0110] Before the experiment, the garbage compost was pretreated to remove the sundries, and after air-drying, it passed through a 2 mm sieve for later use; tall fescue ( Festuca arundinacea L . ); nanocarbon particle size is 50 nm, specific surface area is 1.2×10 5 m 2 kg -1 , with a pH value of 7, which were modified before application to obtain KMnO 4 、H 2 SO 4 or HNO 3 Modified nano carbon;

[0111] The composition of artificial rainwater is (mg / L), NO 3 － :1.94; NH 4 + :0.49; Na + :1.87; Mg 2+ :0.25; Ca 2+ :0.29; Cl － :3.41; SO 4 2－ : 2.65; pH: 4.40;

[0112] (2) Experimental method:

[0113] 1) Design of turf substrate seepage system

[0114] The leaching experiment was carried out under natural light indoors. 63 g of sand was placed in a PVC pipe with a height of 25 cm and a diameter of 3 cm, w...

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Abstract

The invention discloses a method for preventing enrichment of heavy metal in compost by combining modified nano carbon, turfgrass and a chelating agent. According to the method, 63 g of sand is put in PVC (polyvinyl chloride) pipes with heights of 25 cm and diameters of 3 cm, the height of sand is 5 cm, then, a barrier material is laid above the sand, the height of the barrier material is 5 cm, finally, 70 g of compost is put on the compost barrier material, and the height of the compost is 8 cm; and 0.3 g of festuca arundinacea seeds are sowed on the surfaces of the upper layers of the PVC pipes, and all the PVC pipes are irrigated by tap water, so that the water content of the compost and a compost mixture is kept to be 60% of the field capacity, the indoor temperature is 16 DEG C-22 DEG C, and the relative humidity is 36%-57%. The invention further discloses an application of the method for preventing enrichment of the heavy metal in the compost by combining the modified nano carbon, the turfgrass and the chelating agent in the aspect of enhancing prevention of leaching migration of the heavy metal.

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 blocking and enriching composting heavy metals by combining modified nano-carbon with lawn grass and a chelating agent. Background technique [0002] Carbon black exists widely in nature. Early research on carbon black focused on the environmental effects of atmospheric particulate matter. Non-hydrolyzable organic carbon in soil and sediments accounted for 25.6%-70.5% of the total organic carbon content, while carbon black accounted for between 4.14%-16.2% of the total organic carbon content. There are indications that the adsorption isotherm of carbon black to phenanthrene can fit the Freundiich equation well. h 2 SO 4 Modified carbon black to As 5+ The maximum adsorption capacity can reach 62.52mg·g -1 . The methods for surface modification of nano-carbon mainly include chemical modification, physical modi...

Claims

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Application Information

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IPC IPC(8): C05F9/00
CPCY02A40/20
Inventor 赵树兰多立安贺璐
Owner TIANJIN NORMAL UNIVERSITY
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