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- Title
Photocatalytic oxidation of gold processing wastewater from a gold mine in Southwest Guizhou Autonomous Prefecture.
- Authors
Jian Zhao; Haili Wang; Huayu Yuan; Xiaoli Lin; Yonggeng Yan; Yuehu Wang; Lei Liu; Hang Zhang; Mengyu Chen
- Abstract
Wastewater of gold dressing and smelting has dual nature of toxicity and difficult to be treated. Thiocyanate needs to be pretreated before treatment of ammonia nitrogen in the wastewater. So the new treatment method to realize the coupling of thiocyanate treatment and downstream wastewater treatment is important. In this study, wastewater from the tailing-water treatment station of Jinfeng Mining Company is chosen as the research object. Photocatalytic reaction is carried out with phosphorus modified platinum supported titanium dioxide as the catalyst under combined action of chlorine dioxide. Residual amount of ammonia nitrogen, thiocyanate, chemical oxygen demand (COD) and other pollutants after reaction are analyzed to find out their remains. Fouriertransform infrared spectroscopy, transmission electron microscope, scanning electron microscope and electrochemical are used to analyze the effect of the catalysts. The results show that platinum-supported titanium dioxide which is modified by phosphorus has a good response to light environment. When the reaction time is 560.22 min, the light intensity is 5,297.97 lx, the amount of catalyst is 0.33 g, and the amount of chlorine dioxide is 8.88 g, the conversion of thiocyanate can reach 34.71% with a good treatment effect on ammonia nitrogen and COD.
- Subjects
CATALYSTS; GOLD mining; PHOTOCATALYTIC oxidation; SEWAGE; TITANIUM catalysts; CHEMICAL oxygen demand; WASTEWATER treatment
- Publication
Desalination & Water Treatment, 2022, Vol 248, p94
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2022.28106