TY - JOUR
T1 - Self-sustaining carbon capture and mineralization via electrolytic carbonation of coal fly ash
AU - Lu, Lu
AU - Fang, Yanfen
AU - Huang, Zhe
AU - Huang, Yingping
AU - Ren, Zhiyong Jason
N1 - Funding Information:
We thank Mr. Juan-Pablo Gevaudan and Dr. Wil Srubar for providing the fly ash samples and characteristics, and we thanks the financial supports from the University of Colorado Boulder (USA), The Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area (China), and the National Natural Science Foundation of China (Award 21377067 , 21577078 ).
Publisher Copyright:
© 2016
PY - 2016/12/15
Y1 - 2016/12/15
N2 - This study presents a new electrolytic carbonation process to synergize the treatment of different waste streams generated by power plants, including fly ash, brine wastewater, and CO2. The acidity generated by electrolysis of brine electrolyte directly liberates calcium from fly ash. The metal ions balance the OH− produced at the cathode to form hydroxide, which then fixes CO2 into high purity carbonate precipitates. Results show that electrolysis increased fly ash dissolution by 32.4% compared to the control with spontaneous dissolution of fly ash, and the carbonation process captured 89% more CO2 and increased capture capacity from 9.75 to 18.42 kg-CO2/t-fly ash in the NaCl electrolyte. The energy expenditure was 19.4–29.3 kJ/mol-CO2, lower than that required for sorbent or solvent based post-combustion carbon capture. The process takes advantage of all waste streams generated on site and can consolidate traditionally separated treatment processes to save costs, produce energy and value-added products, as well as generate carbon benefits.
AB - This study presents a new electrolytic carbonation process to synergize the treatment of different waste streams generated by power plants, including fly ash, brine wastewater, and CO2. The acidity generated by electrolysis of brine electrolyte directly liberates calcium from fly ash. The metal ions balance the OH− produced at the cathode to form hydroxide, which then fixes CO2 into high purity carbonate precipitates. Results show that electrolysis increased fly ash dissolution by 32.4% compared to the control with spontaneous dissolution of fly ash, and the carbonation process captured 89% more CO2 and increased capture capacity from 9.75 to 18.42 kg-CO2/t-fly ash in the NaCl electrolyte. The energy expenditure was 19.4–29.3 kJ/mol-CO2, lower than that required for sorbent or solvent based post-combustion carbon capture. The process takes advantage of all waste streams generated on site and can consolidate traditionally separated treatment processes to save costs, produce energy and value-added products, as well as generate carbon benefits.
KW - Carbon sequestration
KW - Coal fly ash
KW - Electrolytic carbonation
KW - Hydrogen production
KW - Mineralization
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U2 - 10.1016/j.cej.2016.07.060
DO - 10.1016/j.cej.2016.07.060
M3 - Article
AN - SCOPUS:84979650249
SN - 1385-8947
VL - 306
SP - 330
EP - 335
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -