Application of oxalic acid in removal of soil cadmium pollution

A technology for cadmium pollution and cadmium-contaminated soil, applied in the restoration of polluted soil, etc., can solve the problems of soil being unable to be reused, poor biodegradability, destroying soil structure, etc., achieving outstanding removal effect, low application cost, and leaching rate high effect

Inactive Publication Date: 2013-05-08
SICHUAN AGRI UNIV +1
View PDF7 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that strong acid leaching agents will destroy the soil structure during the leaching process, poisoning the biological communities in the soil and making the soil

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Application of oxalic acid in removal of soil cadmium pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 Soil heavy metal cadmium leaching

[0017] Select high-grade pure oxalic acid, and prepare oxalic acid solutions with a concentration of 0.05wt%-1 wt% respectively as a washing agent, and select polluted soils with cadmium contents of 17.85mg / kg and 118.34mg / kg respectively, according to the liquid-solid ratio of 10: Add 1 (ml / g) eluent, shake at room temperature for 2 hours at a speed of 200 rpm, then transfer the eluate to a centrifuge tube and centrifuge at a speed of 4000 rpm for 15 minutes. The supernatant was filtered and collected, and the content of Cd in the eluent was determined by atomic absorption spectrometer (Table 1). After analysis, the leaching rate of cadmium gradually increased with the increase of the concentration of the leaching agent. When the concentration reached 0.2%, the leaching rates of low-concentration and high-concentration cadmium-contaminated soil reached 65.91% and 48.065%, respectively, showing that The leaching effect on l...

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 relates to an application of oxalic acid in removal of soil cadmium pollution. High-level pure oxalic acid is selected to prepare an oxalate solution with the concentration of 0.05wt%-1wt%, and the oxalate solution is used as an eluting agent; the eluting agent is added into polluted soil; an eluting process can be finished by oscillating, centrifuging and collecting an eluted solution at room temperature and then filtering the eluted solution; and a liquid to solid ratio of the chemical eluting agent to the polluted soil is 10:1 (ml/g). The chemical eluting agent formula is simple; the effect is outstanding; the operability is high; the application cost is low; the eluting rate is high; and a relatively good effect of removing cadmium ions in the soil is achieved. A test shows that when the concentration is 0.2 percent, the eluting rates are respectively 65.91 percent and 48.065 percent; and secondary pollution to the soil is avoided.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal pollution in the environment, in particular to the application of oxalic acid in removing cadmium pollution from soil. Background technique [0002] With the expansion of industrial production scale and the rapid growth of population, heavy metal pollution in soil is becoming more and more serious. And heavy metals in polluted soil can migrate to water bodies and plants, which seriously affects environmental quality and sustainable economic development, and threatens human health. [0003] Soil heavy metal cadmium has the characteristics of concealment, long-term and irreversible. At the same time, as the type of soil heavy metals that my country pays the most attention to and has the widest range of influence, its pollutants will cause obvious harm to the growth and development of crops, and can also endanger human health through the food chain. [0004] At present, phytoreme...

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): B09C1/00
Inventor 张世熔柏宏成胡春易鑫徐小逊李婷龚国淑李云
Owner SICHUAN AGRI UNIV
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