Method for restoring heavy metal in garbage compost by using impermeable layer

A technology of garbage composting and heavy metals, applied in horticultural methods, botanical equipment and methods, applications, etc., can solve problems such as contamination of deep soil and groundwater, difficulty in light, chemical substances, and biodegradation.

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

However, since EDTA and the complex formed by chelation of EDTA and heavy metals have strong solubility and biological toxicity, and are difficult to be degraded by light, chemical substances and biodegradation in soil, it is likely to cause pollution of deep soil and groundwater and other environments. question

Method used

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  • Method for restoring heavy metal in garbage compost by using impermeable layer
  • Method for restoring heavy metal in garbage compost by using impermeable layer
  • Method for restoring heavy metal in garbage compost by using impermeable layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (1) Turf matrix leakage system design:

[0066] Prepare 9 PVC pipes with a diameter of 7.5 cm, a height of 21 cm, and a height of 25 cm. Nylon nets with a diameter of 0.2 mm are fixed at the bottom of all PVC pipes to support the soil and compost in the pipes. container for leachate;

[0067] 2) Put 500 g of air-dried soil in a PVC pipe with a height of 12 cm, and then spread 280 g of air-dried garbage compost on the soil in the short pipe. The height of the compost is 8 cm, and different levels of soakable The barrier layer was placed between the soil and the garbage compost, with a height of 4 cm; the barrier layer consisted of three layers, the lower layer was 20 g of zeolite, the upper layer was 20 g of rice straw, and the middle layer was 40 g of 2 mm particle size Colloidal particles;

[0068] (2) Sowing:

[0069] 1) Sow 0.6 g of tall fescue seeds in PVC pipes, irrigate all PVC pipes with tap water to keep the water content of the compost and soil mixture at 65...

Embodiment 2

[0075] (1) Turf matrix leakage system design:

[0076] Prepare 9 PVC pipes with a diameter of 7.5 cm, a height of 21 cm, and a height of 25 cm. Nylon nets with a diameter of 0.2 mm are fixed at the bottom of all PVC pipes to support the soil and compost in the pipes. container for leachate;

[0077] 2) Put 500 g of air-dried soil in a PVC pipe with a height of 12 cm, and then spread 280 g of air-dried garbage compost on the soil in the short pipe. The height of the compost is 8 cm, and different levels of soakable The barrier layer is placed between the soil and the garbage compost, with a height of 4 cm; the barrier layer consists of three layers, the lower layer is 20 g of zeolite, the upper layer is 20 g of rice straw, and the middle layer is 40 g of egg shell with a particle size of 2 mm. ;

[0078] (2) Sowing:

[0079] 1) Sow 0.6 g of tall fescue seeds in PVC pipes, irrigate all PVC pipes with tap water to keep the water content of the compost and soil mixture at 60% o...

Embodiment 3

[0085] (1) Turf matrix leakage system design:

[0086] Prepare 9 PVC pipes with a diameter of 7.5 cm, a height of 21 cm, and a height of 25 cm. Nylon nets with a diameter of 0.2 mm are fixed at the bottom of all PVC pipes to support the soil and compost in the pipes. container for leachate;

[0087] 2) Put 500 g of air-dried soil in a PVC pipe with a height of 12 cm, and then spread 280 g of air-dried garbage compost on the soil in the short pipe. The height of the compost is 8 cm, and different levels of soakable The barrier layer is placed between the soil and the garbage compost, with a height of 4 cm; the barrier layer consists of three layers, the lower layer is 20 g of zeolite, the upper layer is 20 g of rice straw, and the middle layer is 40 g of vermiculite with a particle size of 2 mm ;

[0088] (2) Sowing:

[0089] 1) Sow 0.6 g of tall fescue seeds in PVC pipes, irrigate all PVC pipes with tap water to keep the water content of the compost and soil mixture at 65% ...

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Abstract

The invention relates to a method for restoring heavy metal in garbage compost by using an impermeable layer, comprising the following steps of: placing 500g of air-dried soil into a PVC (Polyvinyl Chloride) pipe, arranging a barrier layer in the middle of the PVC pipe, and then, and flatly spreading 280g of air-dried garbage compost in the pipe, wherein the barrier layer includes three layers, i.e., a lower layer containing 20g of zeolite, an upper layer containing 20g of rice straw and a middle layer containing 40g of colloidal particles with the particle size of 2mm, egg shells or vermiculite. Experimental results show that the heavy metal in the compost, moving towards the soil on the lower layer, can be effectively reduced through arranging the barrier layer on a soil layer before the garbage compost is applied. The method for purifying the garbage compost or soil polluted by heavy metal by utilizing the cooperation of a chelating agent and phytoremediation and simultaneously adding the barrier layer is a new method and can be developed into a new technology with the cooperation of an environment-harmless chemical method and phytoremediation.

Description

technical field [0001] The invention belongs to the application of garbage composting in the technical field of urban lawn construction, and relates to the use of leaching method to study the effect of temperature on the migration behavior of heavy metals in domestic garbage composting, and more specifically to a method of repairing garbage composting by using an anti-seepage layer Methods for thermoregulation of heavy metals. Background technique [0002] Garbage compost is rich in organic nutrients such as N and P, and is an effective resource for the development of agriculture, vegetables, and forestry production. Garbage compost has good physical and chemical properties and rich nutrients, and is an ideal material to replace soil as a lawn substrate. Therefore, the use of domestic waste compost as a lawn substrate can not only avoid the food chain, but also solve the problem of the way out of the waste. In my country with a large population and relatively poor land reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G1/00A01G7/00C05G1/00
Inventor 赵树兰多立安尚小娟
Owner TIANJIN NORMAL UNIVERSITY
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