TY - JOUR
T1 - Pretreatment of membrane separation of glyphosate mother liquor using a precipitation method
AU - Liu, Zhiying
AU - Zhu, Mingxin
AU - Yu, Peng
AU - Xu, Yanhua
AU - Zhao, Xianguang
PY - 2013/3/5
Y1 - 2013/3/5
N2 - During the nanofiltration membrane separation of glyphosate mother liquor, a precipitation method was employed to remove HPO32, which is often the cause of membrane fouling and blockage. Such removal reduces the speed of membrane flux attenuation. The purpose of the present study was to investigate the effects of precipitant quantity and type, pH value, stirring time and speed, and standing time, on the removal of HPO32?. In addition, the membrane flux separated by the nanofiltration membrane of the mother liquor post-pretreatment, was tested. Results indicated that when the initial pH was 9, the following pretreatment procedure resulted in the removal of more than 60% of the HPO32 from the glyphosate mother liquor: the addition of 0.24mol/L AlCl3.6H2O, stirring at 300r/min for 30s and 100r/min for 2.5min, followed by standing for 30min. This pretreatment-precipitation method can markedly enhance the nanofiltration membrane flux in the mother liquor and reduce the membrane flux attenuation, which facilitates nanofiltration membrane separation of the glyphosate mother liquor.
AB - During the nanofiltration membrane separation of glyphosate mother liquor, a precipitation method was employed to remove HPO32, which is often the cause of membrane fouling and blockage. Such removal reduces the speed of membrane flux attenuation. The purpose of the present study was to investigate the effects of precipitant quantity and type, pH value, stirring time and speed, and standing time, on the removal of HPO32?. In addition, the membrane flux separated by the nanofiltration membrane of the mother liquor post-pretreatment, was tested. Results indicated that when the initial pH was 9, the following pretreatment procedure resulted in the removal of more than 60% of the HPO32 from the glyphosate mother liquor: the addition of 0.24mol/L AlCl3.6H2O, stirring at 300r/min for 30s and 100r/min for 2.5min, followed by standing for 30min. This pretreatment-precipitation method can markedly enhance the nanofiltration membrane flux in the mother liquor and reduce the membrane flux attenuation, which facilitates nanofiltration membrane separation of the glyphosate mother liquor.
KW - Glyphosate mother liquor
KW - HPO
KW - Membrane flux
KW - Membrane separation
KW - Precipitation method
UR - http://www.scopus.com/inward/record.url?scp=84872475355&partnerID=8YFLogxK
U2 - 10.1016/j.desal.2012.12.011
DO - 10.1016/j.desal.2012.12.011
M3 - 文章
AN - SCOPUS:84872475355
SN - 0011-9164
VL - 313
SP - 140
EP - 144
JO - Desalination
JF - Desalination
ER -