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Method for immobilizing heavy metal in lawn compost matrix with graphene

A graphene and heavy metal technology, applied in land preparation methods, applications, organic fertilizers, etc., can solve problems such as heavy metals and achieve the effect of promoting resource utilization

Inactive Publication Date: 2016-11-09
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through this technology, an effective method can be provided to solve the problem of heavy metals in domestic waste composting

Method used

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  • Method for immobilizing heavy metal in lawn compost matrix with graphene
  • Method for immobilizing heavy metal in lawn compost matrix with graphene
  • Method for immobilizing heavy metal in lawn compost matrix with graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] (1) Development materials

[0077] The waste compost for the test was taken from Tianjin Xiaodian Domestic Waste Compost Treatment Plant, passed through a 2mm sieve for later use; its basic physical and chemical properties are: organic matter content 22.00%, bulk density 0.79g / cm 3 , porosity 67.98%, saturated water content 0.67ml·g -1 , pH value 7.49, total nitrogen 0.57%, total phosphorus 0.34%, total potassium 1.21%, available phosphorus 0.078 g·kg -1 , C / N is 8.37, and the metal contents are: Ca 23.23 mg / kg, Fe 30.49g / kg, Mg 5.78 g / kg, Cu 341.34 mg / kg, Zn 677.33 mg / kg, Pb 216.98 mg / kg , Cd 5.02 mg / kg, Mn 437.88 mg / kg, Cr 702.6 mg / kg, Ni 41.82 mg / kg.

[0078] Graphene, a carbon nanomaterial, was purchased from Nanjing Jicang Nano Technology Co., Ltd. It is black and has an irregular thin-sheet structure. The size of the microchip is 10 μm; the thickness of the microchip is 5 nm; the specific surface area is 40 m 2 / g; density: about 2.25 g / cm 3 ; Conductivity: 80...

Embodiment 2

[0085] (1) Development materials

[0086] The waste compost for the test was taken from Tianjin Xiaodian Domestic Waste Compost Treatment Plant, passed through a 2mm sieve for later use; its basic physical and chemical properties are: organic matter content 22.00%, bulk density 0.79g / cm 3 , porosity 67.98%, saturated water content 0.67ml·g -1 , pH value 7.49, total nitrogen 0.57%, total phosphorus 0.34%, total potassium 1.21%, available phosphorus 0.078 g·kg -1 , C / N is 8.37, and the metal contents are: Ca 23.23 mg / kg, Fe 30.49g / kg, Mg 5.78 g / kg, Cu 341.34 mg / kg, Zn 677.33 mg / kg, Pb 216.98 mg / kg , Cd 5.02 mg / kg, Mn 437.88 mg / kg, Cr 702.6 mg / kg, Ni 41.82 mg / kg.

[0087] Graphene, a carbon nanomaterial, was purchased from Nanjing Jicang Nano Technology Co., Ltd. It is black and has an irregular sheet-like structure. The size of the microchip is 20 μm; the thickness of the microchip is 25 nm; 2 / g; density: about 2.25g / cm 3 ; Conductivity: 10000 S / m; Carbon content: >99.5%. ...

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Abstract

The invention discloses a method for immobilizing heavy metal in a lawn compost matrix with graphene. According to the method, graphene or a derivative thereof is selected as an adsorbent, large-size graphene nanoplatelets or multilayer graphene oxide is selected for immobilizing heavy metal in a lawn household refuse compost matrix, a scientific basis can be provided for immobilization of compost heavy metal, and recycling of household refuse can be promoted. The invention further discloses application of the method for immobilizing heavy metal in a lawn compost matrix with graphene in improving adsorption on heavy metal Cd, Cr, Cu, Pb and Zn in a lawn household refuse compost matrix system.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for fixing heavy metals in lawn composting matrix by using graphene. Background technique [0002] Household garbage mainly refers to the solid waste generated in residents' daily life and production. Global domestic waste will increase by 51% from 2005 to 2025. The average annual growth rate of domestic waste in my country exceeds 15%, and the accumulation of waste piles across the country has occupied more than 500 million square meters of land. By 2015, the annual domestic waste production in some of our cities is expected to exceed 10 million tons. The distribution of physical components of domestic waste is mainly inorganic matter such as glass, brick tiles, and cinder ash, and organic matter such as plants, fibers, plastics, and paper, among which compostable matter accounts for more than 30%. The chemical components are mainly water, N, P, K, org...

Claims

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Application Information

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IPC IPC(8): A01B79/02C05F9/04
CPCA01B79/02C05F9/04Y02A40/20
Inventor 多立安赵树兰卢云峰
Owner TIANJIN NORMAL UNIVERSITY
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