Ozone advanced oxidation has been widely used in water treatment, but little research has been reported on the application of ozone to difficult-to-degrade mineral wastewater. In this paper, the effect of ozonation application in the treatment of copper mineral processing wastewater, which is difficult to be effectively treated by traditional processes due to its complex composition, was investigated. The effects of ozonation time, ozone concentration, temperature and pH on the degradation of organic compounds in the wastewater by ozonation were researched. It was found that the chemical oxygen demand (COD) of the wastewater could be reduced by 83.02% by ozonation under optimal treatment conditions. In addition, the mechanism of ozone degradation of the difficult-to-degrade wastewater was studied, and the reasons for the fluctuating variations of COD and ammonia nitrogen during ozonation treatment were explained.
Copper mine wastewater is a rather tough environmental issue. An efficient and effective method is still expected. Ozone advanced oxidation technology is applied to treat copper mine wastewater in this paper. A systematical investigation is performed and the degradation mechanism is revealed. Experimental results show ozone can effectively degrade COD meanwhile all pollutants indexes can meet the strict emission requirement. There are two interesting discoveries in copper mine wastewater treatment process by ozone advanced oxidation. One is COD change with ozone aeration time. COD rapidly decreases initially, followed by a small recovery, but then decreases slightly. The dramatical decrease in the first several minutes results from the oxidation of residual flotation reagents, humic acid-like and soluble microbial product-like. The small recovery is because these substances of protein-like and humic acid-like are oxidized to small molecules. The last slight decrease is due to the further oxidation of these small molecules. Another is ammonia nitrogen change in fluctuations with ozone aeration time. The oxidation CwHxNyOz in residual flotation reagent Xanthate leads the first ammonia nitrogen increase and the following first decrease, respectively. It is followed by another increase and decrease. The second increase is owing to these relatively stable nitrogenous organic matters of protein-like and fulvic acid-like are oxidized to ammonia nitrogen. The last reduce results from the further oxidation of ammonia nitrogen. In a word, ozone advanced oxidation is a promising technology for copper mine wastewater treatment.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.