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- Title
Geochemical modeling of brine remediation using accelerated carbonation of fly ash.
- Authors
Grace, Muriithi Nyambura; Leslie, Petrik Felicia; Frédéric, Doucet Jules
- Abstract
A protocol is proposed, where waste fly ash and CO2emissions from coal-fired power plants are utilized in remediating brine waste. The untreated brine sample was made up of Na+,, Cl−, Ca2+, Mg2+, and K+as the major ions with trace concentrations of other ions. The brine can thus be classified as-rich water with respect to major cations and anions. Following carbonation, over 99% removal of NO3−was achieved while B3+, V2+, MO2+, and Cl−concentrations increased. Major components removal from brine upon carbonation was as follows: Na+(15–29%), Mg2+(53–87%), K+(70–88%), Ca2+(40–73%), and(12–36%). Speciation modeling of the major components present in brine showed that Na+, K+, and Cl−exist mainly as free ions, while Mg2+and Ca2+are associated withas well as being in their free forms.ions on the other hand were present in its free form to a great extent as well as associated with Na+, Ca2+, Mg2+, and K+, respectively, in a decreasing order. The carbonated brine effluents are therefore depleted with regards to major and trace elements concentration, when compared with the untreated brine. Mineral carbonation may therefore be a potent brine remediation protocol, which can be optimized for maximum removal of various elements.
- Subjects
GEOCHEMICAL modeling; SEWAGE purification; FLY ash; CARBONATION (Chemistry); CATIONS
- Publication
Desalination & Water Treatment, 2016, Vol 57, Issue 11, p4853
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2014.1003607