Back to Search
Start Over
A novel polymer inclusion membrane based method for continuous clean-up of thiocyanate from gold mine tailings water
- Source :
- Journal of hazardous materials. 341
- Publication Year :
- 2017
-
Abstract
- Thiocyanate is present in gold mine tailings waters in concentrations up to 1000mgL-1 and this has a serious environmental impact by not allowing water reuse in the flotation of gold ore. This significantly increases the consumption of fresh water and the amount of wastewater discharged in tailings dams. At the same time thiocyanate in tailings waters often leads to groundwater contamination. A novel continuous membrane-based method for the complete clean-up of thiocyanate in concentrations as high as 1000mgL-1 from its aqueous solutions has been developed. It employs a flat sheet polymer inclusion membrane (PIM) of composition 70wt% PVC, 20wt% Aliquat 336 and 10wt% 1-tetradecanol which separates counter-current streams of a feed thiocyanate solution and a 1M NaNO3 receiving solution. The PIM-based system has been operated continuously for 45days with 99% separation efficiency. The volume of the receiving solution has been drastically reduced by recirculating it and continuously removing thiocyanate by precipitating it with in-situ generated Cu(I). The newly developed PIM-based thiocyanate clean-up method is environmentally friendly in terms of reagent use and inexpensive with respect to both equipment and running costs.
- Subjects :
- Environmental Engineering
Aqueous solution
Thiocyanate
Ion exchange
Waste management
Health, Toxicology and Mutagenesis
02 engineering and technology
010501 environmental sciences
Aliquat 336
021001 nanoscience & nanotechnology
01 natural sciences
Pollution
Tailings
6. Clean water
chemistry.chemical_compound
chemistry
Wastewater
13. Climate action
Reagent
Environmental Chemistry
Sewage treatment
0210 nano-technology
Waste Management and Disposal
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 18733336
- Volume :
- 341
- Database :
- OpenAIRE
- Journal :
- Journal of hazardous materials
- Accession number :
- edsair.doi.dedup.....c4fe89ddaa0507fd3d2e21b5ae55b978