Natural marmatite photocatalyst for treatment of mineral processing wastewater to help zero wastewater discharge  

作　　者：Meirong Wu Wei Sun Xiangsong Meng Jianhua Kang Yue Yang 

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China [2]Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources,Central South University,Changsha 410083,China

出　　处：《Journal of Environmental Sciences》2024年第8期83-91,共9页环境科学学报（英文版）

基　　金：supported by the Central South University Innovation Driven Research Programme(No.2023CXQD009);the Fundamental Research Funds for the Central Universities of Central South University(No.2022ZZTS0110);the China National Postdoctoral Program for Innovative Talents(No.BX2021380);the China Postdoctoral Science Foundation(No.2021M703635);the Open Foundation of State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control(No.HB202107);the Natural Science Foundation of Changsha,China(No.kq2202095)。

摘　　要：Mineral processing wastewater(MPW)with large discharge and high toxicity affects environmental safety,and the realizing zero discharge of MPW is of great significance for reducing environmental pollution,saving water resources,and promoting the sustainable development of the mining industry.In this study,we reported natural marmatite(NM)as a low-cost and efficient photocatalyst for the treatment of MPW to help zero wastewater discharge.The photocatalytic activity of NM was evaluated by the removal of total organic carbon(TOC)from MPW under visible-light illumination,and the optimal degradation conditions were discussed.Results showed that superoxide free radicals(^(·)O_(2)^(-))were the dominant active species responsible for organic pollutants degradation,and 74.25%TOC removal was obtained after 120 min reaction under the optimum treatment conditions.Meanwhile,the wastewater treated by NM photocatalysis can be reused in the flotation system without adverse impact on the product index.Based on these findings,a model of zero wastewater discharge for flotation with the help of photocatalytic treatment was established,it indicated that the water of the whole system can be balanced without affecting the ore dressing index,which showed that visible light-driven photocatalyst has a promising application prospect in the treatment and recycling of industrial wastewater.

关 键 词：Natural mineral PHOTOCATALYSIS Industrial wastewater Wastewater recycling Water balance 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X751[环境科学与工程—环境工程]