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- Title
Removal of ions from produced water using Powder River Basin coal.
- Authors
Huang, Zaixing; Liu, Fangjing; Tang, Mingchen; Gao, Yangyan; Bagley, David M.; He, Xin; Goroncy, Alexander; Fan, Maohong
- Abstract
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.
- Subjects
OIL field brines; COAL basins; WATERSHEDS; TOTAL suspended solids; WATER use; SUSPENDED solids; COAL combustion
- Publication
International Journal of Coal Science & Technology, 2022, Vol 9, Issue 1, p1
- ISSN
2095-8293
- Publication type
Article
- DOI
10.1007/s40789-022-00477-1