Heavy metal cadmium, lead and arsenic compound contaminated soil restorative agent and preparation method thereof

A soil remediation agent and compound pollution technology, which is applied in the field of lead, arsenic compound polluted soil remediation agent and its preparation, and heavy metal cadmium, can solve the problems of nutrient element loss, soil structure damage, and low repair efficiency, so as to increase the adsorption capacity, The effect of high adsorption value and high porosity

Inactive Publication Date: 2016-07-13
CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
View PDF4 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the treatment methods for soil heavy metal pollution mainly include immobilization/stabilization, leaching, soil washing, electrokinetic remediation, chemical reduction, phytoremediation, and microbial remediation. There are generally probl

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The test soil was collected from a heavy metal-polluted area, and the heavy metal content in the soil surface of this area was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:

[0049] (a), take a sample from the soil, and detect the concentration of heavy metals in the soil before remediation by using an overturning oscillator to perform a leaching test on the soil according to the solid waste "Leach Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007);

[0050] (b) Preparation of soil remediation agent: use the mixture of straw and calcium oxide as raw material, the mass ratio of straw and calcium oxide is 20:1, and heat it in vacuum under the conditions of system pressure of 20kPa and pyrolysis temperature of 500°C Decompose for 30 minutes, and obtain biochar powder with a particle size of less than 3 mm through grinding; obtain sodium-based be...

Embodiment 2

[0068] The test soil was collected from a heavy metal-polluted area, and the heavy metal content in the soil surface of this area was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:

[0069] (a), take a sample from the soil, and detect the concentration of heavy metals in the soil before remediation by using an overturning oscillator to perform a leaching test on the soil according to the solid waste "Leach Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007);

[0070] (b) Preparation of soil remediation agent: use the mixture of straw and calcium oxide as raw material, the mass ratio of straw and calcium oxide is 20:1, and heat it in vacuum under the conditions of system pressure of 20kPa and pyrolysis temperature of 500°C Decompose for 30 minutes, and obtain biochar powder with a particle size of less than 3 mm through grinding; obtain sodium-based be...

Embodiment 3

[0088] The test soil was collected from a heavy metal-polluted area, and the heavy metal content in the soil surface of this area was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:

[0089] (a), take a sample from the soil, and detect the concentration of heavy metals in the soil before remediation by using an overturning oscillator to perform a leaching test on the soil according to the solid waste "Leach Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007);

[0090] (b) Preparation of soil remediation agent: use the mixture of straw and calcium oxide as raw material, the mass ratio of straw and calcium oxide is 20:1, and heat it in vacuum under the conditions of system pressure of 20kPa and pyrolysis temperature of 500°C Decompose for 30 minutes, and obtain biochar powder with a particle size of less than 3 mm through grinding; obtain sodium-based be...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a heavy metal cadmium, lead and arsenic compound contaminated soil restorative agent. The heavy metal cadmium, lead and arsenic compound contaminated soil restorative agent is prepared from the following components in percentage by weight: 30-50 percent of biomass charcoal, 5-10 percent of diatomite, 5-10 percent of sodium bentonite, 5-10 percent of activated aluminum oxide, 10-20 percent of dithiocar-bamate, 5-10 percent of ethylenediaminetetraacetic acid, 5-10 percent of tartaric acid, 5-10 percent of polyacrylamide and 5-10 percent of sodium dodecyl sulfate. A preparation method for the heavy metal cadmium, lead and arsenic compound contaminated soil restorative agent comprises the following steps: mixing the biomass charcoal, diatomite, sodium bentonite, activated aluminum oxide, ethylenediaminetetraacetic acid, tartaric acid, polyacrylamide and sodium dodecyl sulfate in mass proportion to obtain a mixture; and adding the dithiocar-bamate into the mixture in corresponding mass proportion to sufficiently mix uniformly, thereby obtaining the prepared soil restorative agent. The prepared soil restorative agent has good effect in restoring the cadmium, lead and arsenic compound contaminated soil.

Description

Technical field: [0001] The invention belongs to the technical field of soil pollution restoration, and in particular relates to a heavy metal cadmium, lead and arsenic compound polluted soil restoration agent and a preparation method thereof. Background technique: [0002] According to the "National Soil Pollution Survey Bulletin" issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the overall situation of the national soil environment is not optimistic, the soil pollution in some areas is relatively serious, the quality of the soil environment of cultivated land is worrying, and the soil environment problems of industrial and mining wasteland are prominent. . Man-made activities such as industry, mining, agriculture, and high background values ​​of the soil environment are the main causes of soil pollution or exceeding standards. The total exceeding rate of national soil is 16.1%, of which the proportions of slightly, lightly...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C09K17/40B09C1/08
CPCC09K17/40B09C1/08
Inventor 周益辉
Owner CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap