TY - JOUR
T1 - Treatment of acid mine drainage by forward osmosis
T2 - Heavy metal rejection and reverse flux of draw solution constituents
AU - Vital, Bárbara
AU - Bartacek, Jan
AU - Ortega-Bravo, J. C.
AU - Jeison, David
N1 - Funding Information:
Authors want to thank financial support provided by CONICYT/FONDECYT (projects 3160398 and 1150982) and by CRHIAM centre (CONICYT/FONDAP 15130015). Authors would also like to thank Dr. Alex Schwarz from Universidad de Concepción for providing AMD sample used to conduct this study.
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018/1/15
Y1 - 2018/1/15
N2 - Acid mine drainage (AMD) is one of the most relevant potential environmental liabilities of mining activities. They are formed when the excavated ore is exposed to rain and other natural erosion factors. This research evaluated the application of forward osmosis (FO) for the treatment of AMD. Rejection of several metals was determined, using a thin-film composite FO membrane, and two types of draw solutions: NaCl and NH4HCO3. When using NaCl as draw solution, results showed high levels of rejection, exceeding 97%. Individual rejections were Mg: 98.9%, Al: 99.8%, Si: 97.1%, Ca: 99.3%, Mn: 99.6%, Fe: 100%, Co: 99.4%, Cu: 98.9%, Zn: 99.5%. When using NH4HCO3 as draw solute, precipitates were observed over membrane surface, preventing normal operation. Results show that transport of ions from draw solution (Ammonia and bicarbonate) is the cause of such phenomenon. FO has the potential to become an alternative for the treatment of AMD, based on the high levels of rejection for metals provided by FO membranes. However, attention must be paid to the reverse flux of ions from the draw solution to the feed, especially when they can react with feed solutes.
AB - Acid mine drainage (AMD) is one of the most relevant potential environmental liabilities of mining activities. They are formed when the excavated ore is exposed to rain and other natural erosion factors. This research evaluated the application of forward osmosis (FO) for the treatment of AMD. Rejection of several metals was determined, using a thin-film composite FO membrane, and two types of draw solutions: NaCl and NH4HCO3. When using NaCl as draw solution, results showed high levels of rejection, exceeding 97%. Individual rejections were Mg: 98.9%, Al: 99.8%, Si: 97.1%, Ca: 99.3%, Mn: 99.6%, Fe: 100%, Co: 99.4%, Cu: 98.9%, Zn: 99.5%. When using NH4HCO3 as draw solute, precipitates were observed over membrane surface, preventing normal operation. Results show that transport of ions from draw solution (Ammonia and bicarbonate) is the cause of such phenomenon. FO has the potential to become an alternative for the treatment of AMD, based on the high levels of rejection for metals provided by FO membranes. However, attention must be paid to the reverse flux of ions from the draw solution to the feed, especially when they can react with feed solutes.
KW - Acid mine drainage
KW - Forward osmosis
KW - Heavy metals rejection
UR - http://www.scopus.com/inward/record.url?scp=85034054050&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2017.09.034
DO - 10.1016/j.cej.2017.09.034
M3 - Article
AN - SCOPUS:85034054050
VL - 332
SP - 85
EP - 91
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -