A Zn in-situ and ex-situ coupling detoxification method based on biogas residues in heavily polluted sites

A heavy pollution, site technology, applied in the restoration of polluted soil and other directions, can solve the problems of secondary pollution, high cost, high energy consumption, etc., and achieve the effect of strong natural tolerance, lasting and effective fixation, and cost reduction.

Active Publication Date: 2022-03-04
上海洁壤环保科技有限公司
View PDF16 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high temperature melting method is costly and consumes a lot of energy
The biological method has a long reaction cycle and is likely to cause secondary pollution by foreign biological agents
The effect of the curing method is unstable, and the curing agent is likely to cause secondary pollution to the soil
Patent No. 201510056406.6 introduces a solidification method for soil containing heavy metals, but this method uses a large amount of materials, and the cost is high. On the other hand, the solidification effect is unstable. For example, the added calcium oxide is prone to carbonation under natural conditions. Reduces the effect of alkaline curing

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

[0017] (1) Mix sodium sulfate, biogas residue or carbon source solution according to a certain ratio, so that the dry biogas residue content of the mixed solution is 0.1-5%, the solid content is 0.5-5%, the organic carbon content is 0.5-5%, and the sulfate (in SO4 record) / organic carbon mass ratio is 0.7: 1, and the solution reaction after mixing is 2 days, obtains Zn soil remediation medicament;

[0018] (2) Excavate 10m of Zn-containing site surface soil, then lay a mesh geomembrane on the bottom of the excavated site, and lay anti-seepage materials around the excavated site to build a semi-closed storage yard;

[0019] (3) The soil in step (2) is crushed to below 5 mm, then mixed with the medicament described in step (1), the mixing ratio is that the mass ratio of Zn-containing soil to medicament is 1:0.5, and then placed in step (2) Closed storage in the semi-enclosed yard;

[0020] (4) During the stockpiling period, keep the soil moisture content in the range of 5-60% in...

Embodiment 2

[0022] (1) Mix sodium sulfate, biogas residue or carbon source solution according to a certain ratio, so that the dry biogas residue content of the mixed solution is 5-15%, the solid content is 5-15%, the organic carbon content is 5-15%, and the sulfate (in SO4 record) / organic carbon mass ratio is 0.5: 1, and the mixed solution reacts 1 day, obtains Zn soil remediation medicament;

[0023] (2) Excavate 5m of Zn-containing site surface soil, then lay a mesh geomembrane on the bottom of the excavated site, and lay anti-seepage materials around the excavated site to build a semi-closed storage yard;

[0024] (3) The soil in step (2) is crushed to below 5 mm, then mixed with the medicament described in step (1), the mixing ratio is that the mass ratio of Zn-containing soil to medicament is 1:0.5, and then placed in step (2) Closed storage in the semi-enclosed yard;

[0025] (4) During the stockpiling period, keep the soil moisture content in the range of 5-60% in the initial 20 d...

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 present invention adopts a Zn in-situ and ex-situ coupling detoxification method based on biogas residues in heavily polluted sites. Biogas residues, carbon sources, and sulfates are prepared into medicaments and applied to Zn-containing soils, and then special construction and maintenance methods are adopted. Make the reducing ecological bacterial agent gradually seep into the ground, and restore Zn in the deep contaminated soil. This method can remediate Zn-containing sites with high pollution depth at low cost and high efficiency, and at the same time treat waste with waste, and treat the biogas residue.

Description

technical field [0001] The present invention provides a new method for treating Zn-polluted soil. Biogas slag, carbon source and sulfate are formulated into medicaments and applied to Zn-containing soil, and then a special maintenance method is adopted to efficiently fix Zn while avoiding sulfate. Secondary pollution, which belongs to the field of environmental protection. Background technique [0002] A large amount of soil is polluted by Zn due to the random discharge of mining and metallurgical wastewater. Current methods for treating zinc-containing soils are flawed. The high temperature melting method is costly and consumes a lot of energy. The biological method has a long reaction cycle and is likely to cause secondary pollution by foreign biological agents. The effect of the curing method is unstable, and the curing agent is likely to cause secondary pollution to the soil. Patent No. 201510056406.6 introduces a solidification method for soil containing heavy metal...

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
Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/10
Inventor 张大磊李瑞栋王欣玉
Owner 上海洁壤环保科技有限公司
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