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Method for repairing garbage compost heavy metal by adopting NTA (Nitrilotriacetic acid) of waste interlayer

A technology for garbage composting and heavy metals, which is applied in the fields of botanical equipment and methods, horticultural methods, applications, etc., and can solve the problems of leaching and migration of heavy metals that need to be studied.

Inactive Publication Date: 2012-08-15
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is proposed that the use of a permeable barrier placed between compost and soil will help slow down the downward migration of heavy metals, but the choice of material for the barrier and the impact of the barrier on the leaching and migration of heavy metals remain to be studied

Method used

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  • Method for repairing garbage compost heavy metal by adopting NTA (Nitrilotriacetic acid) of waste interlayer
  • Method for repairing garbage compost heavy metal by adopting NTA (Nitrilotriacetic acid) of waste interlayer
  • Method for repairing garbage compost heavy metal by adopting NTA (Nitrilotriacetic acid) of waste interlayer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] (1) Experimental materials:

[0079] 1) Select the perennial tall fescue in northern my country ( Festuca arundinacea L . ) was the experimental material; the waste compost used in the experiment was taken from Tianjin Xiaodian Composting Plant, and the test soil was taken from the surface garden soil at a depth of 20 cm.

[0080] 2) The interlayer material is composed of 20g zeolite, 20g vermiculite and 20g sawdust from bottom to top, and all the above materials are dried at 80°C for later use;

[0081] 3) Preparation of shower solution

[0082] with (NH 4 ) 2 SO 4 、Na 2 SO 4 、K 2 SO 4 , MgSO 4 , Ca(NO 3 ) 2 , Mg(NO 3 ) 2 、H 2 SO 4 SO 4 2- , NO 3 - , Cl - , NH + , Mg 2+ , Ca 2+ 、K + 、Na + Concentrations are: 14.96, 6.54, 1.68, 3.71, 0.82, 1.38, 0.64, and 0.78 mg / L, and use HCl to prepare a drenching solution with a pH of 5.-6 for later use;

[0083] (2) Experimental method

[0084] 1) Support the bottom of the PVC pipe with a diameter of 7...

Embodiment 2

[0093] (1) Experimental materials:

[0094] 1) Select the perennial tall fescue in northern my country ( Festuca arundinacea L . ) was the experimental material; the waste compost used in the experiment was taken from Tianjin Xiaodian Composting Plant, and the test soil was taken from the surface garden soil at a depth of 10 cm.

[0095] 2) The interlayer material is composed of 20g zeolite, 20g vermiculite and 20g sawdust from bottom to top, and all the above materials are dried at 80°C for later use;

[0096] 3) Preparation of shower solution

[0097] with (NH 4 ) 2 SO 4 、Na 2 SO 4 、K 2 SO 4 , MgSO 4 , Ca(NO 3 ) 2 , Mg(NO 3 ) 2 、H 2 SO 4 SO 4 2- , NO 3 - , Cl - , NH + , Mg 2+ , Ca 2+ 、K + 、Na + Concentrations are: 14.96, 6.54, 1.68, 3.71, 0.82, 1.38, 0.64, and 0.78 mg / L, and use HCl to prepare a drenching solution with a pH of 5.-6 for later use;

[0098] (2) Experimental method

[0099]1) Support the bottom of the PVC pipe with a diameter of 7.5...

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Abstract

The invention discloses a method for repairing garbage compost heavy metal by adopting NTA (Nitrilotriacetic acid) of a waste interlayer. The method comprises the following steps of: filling 500g air-dried garden soil, 60g horizontal interlayer and 280g compost in a PVC (Poly Vinyl Chloride) pipe with the diameter of 7.5 cm and the length of 25 cm in turn; sowing 0.6g festuca arundinacea seeds in the pipe, applying 10-20 mmol / kg aqueous solution of NTA sodium salt of compost on the compost surface after sowing for 30 days; clipping grass after 10 days; and measuring the content changes of heavy metal Cd, Cr, Cu, Pb and Zn. A test result of the method provided by the invention shows that: the migration of harmful substances and heavy metal in the garbage compost to the soil can be reduced by paving the horizontal interlayer above the soil and under the compost, so as to increase the time of a lawn plant for absorbing heavy metal in the compost and the enrichment of heavy metal in the lawn plant under the induction of chelating agent and reduce the migration of heavy metal to deep soil.

Description

technical field [0001] The invention belongs to the application of garbage composting in the technical field of urban lawn planting, and relates to a method for repairing heavy metals in garbage composting by using NTA in a waste interlayer. Background technique [0002] Using domestic garbage compost as a lawn substrate can not only avoid the food chain, but also solve the problem of the way out of garbage. Garbage compost has good physical and chemical properties and rich nutrients, and is an ideal material to replace soil as a lawn substrate. In my country with a large population and relatively poor land resources, it is more practical to use garbage compost as a lawn substrate. Some turf plants can grow in heavy metal-polluted substrates with fast growth and strong regeneration ability. They have great application value in the synergistic restoration of heavy metals in garbage compost by chemical and biological methods. Therefore, while garbage compost is used as a law...

Claims

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Application Information

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IPC IPC(8): A01G1/00A01G7/00C05G1/00
Inventor 赵树兰多立安贾丽娜
Owner TIANJIN NORMAL UNIVERSITY
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