Removal of ions from produced water using Powder River Basin coal

International Journal of Coal Science & Technology

Alexander Goroncy¹  Zaixing Huang²  Maohong Fan³  Mingchen Tang⁴  Xin He⁴  Fangjing Liu⁴  David M. Bagley⁴  Yangyan Gao⁵ 

[1] Department of Chemistry, University of Wyoming, 82071, Laramie, WY, USA;Department of Petroleum Engineering, University of Wyoming, 82071, Laramie, WY, USA;Department of Petroleum Engineering, University of Wyoming, 82071, Laramie, WY, USA;School of Civil and Environmental Engineering, Georgia Institute of Technology, 30332, Atlanta, GA, USA;Departments of Chemical Engineering, University of Wyoming, 82071, Laramie, WY, USA;Departments of Chemical Engineering, University of Wyoming, 82071, Laramie, WY, USA;Department of Environmental Engineering, Shanxi University, 030001, Taiyuan, China;

关键词: Produced water;    Ion exchange;    Resonance effect;    Ion–π interaction;    Sustainability;   

DOI  :  10.1007/s40789-022-00477-1

来源: Springer

【 摘 要 】

In addition to being used as an energy source, coal also has significant potential for other, more sustainable uses including water treatment. In this study, we present a simple approach to treat water that was produced during oil production and contained a total dissolved solids (TDS) content of over 150 g/L using Powder River Basin (PRB) coal. PRB coal used as packing material in a flow-through column effectively removed 60%–80% of the cations and anions simultaneously. Additionally, 71%–92% of the total organic carbon in the produced water was removed as was all of the total suspended solids. The removal mechanisms of both cations and anions were investigated. Cations were removed by ion exchange with protons from oxygen-containing functional groups such as carboxylic and phenolic hydroxyl groups. Anions, mainly Cl−1, appeared to be removed through either the formation of resonance structures as a result of delocalization of electrons within coal molecules or through ion–π interactions. We propose that coal is a “pseudo-amphoteric” exchange material that can remove cations and anions simultaneously by exchanging ions with both ionized and non-ionized acids that are ubiquitous in coal structure or resonance effect.Graphical abstract

【 授权许可】

CC BY