TY - JOUR
T1 - Coagulation efficiency, floc properties and membrane fouling of polyaluminum chloride in coagulation-ultrafiltration system
T2 - THE role of magnesium
AU - Zhao, Shuang
AU - Gao, Baoyu
AU - Sun, Shenglei
AU - Yue, Qinyan
AU - Dong, Hongyu
AU - Song, Wen
N1 - Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/3/1
Y1 - 2015/3/1
N2 - The influence of magnesium on coagulation-ultrafiltration process was investigated regarding coagulation efficiency, floc properties and the subsequent impact on membrane fouling. PACl with different basicity values (B, OH/Al3+molar ratio) were used as coagulants. Fulvic acid (FA) water and high hardness FA water (containing magnesium) were used as original water in this study. Floc characteristics were investigated using a laser diffraction particle sizing device while membrane fouling was evaluated by a dead-end ultrafiltration batch unit. The results showed that PACl with higher OH/Al3+ value was more efficient for FA removal. Moreover, the addition of magnesium could improve its coagulation efficiency. Flocs generated in FA-magnesium water was smaller than that of FA water and showed a lower Df value, which indicated that these flocs had open structures. Results of ultrafiltration test showed that membrane fouling became severe as OH/Al3+ value increasing in FA water, but could be reduced apparently when magnesium was added. In addition, the permeate pH increased as OH/Al3+ values growing whereas the permeate pH of FA-magnesium solution was higher than that of FA solution regardless of the original pH and coagulants.
AB - The influence of magnesium on coagulation-ultrafiltration process was investigated regarding coagulation efficiency, floc properties and the subsequent impact on membrane fouling. PACl with different basicity values (B, OH/Al3+molar ratio) were used as coagulants. Fulvic acid (FA) water and high hardness FA water (containing magnesium) were used as original water in this study. Floc characteristics were investigated using a laser diffraction particle sizing device while membrane fouling was evaluated by a dead-end ultrafiltration batch unit. The results showed that PACl with higher OH/Al3+ value was more efficient for FA removal. Moreover, the addition of magnesium could improve its coagulation efficiency. Flocs generated in FA-magnesium water was smaller than that of FA water and showed a lower Df value, which indicated that these flocs had open structures. Results of ultrafiltration test showed that membrane fouling became severe as OH/Al3+ value increasing in FA water, but could be reduced apparently when magnesium was added. In addition, the permeate pH increased as OH/Al3+ values growing whereas the permeate pH of FA-magnesium solution was higher than that of FA solution regardless of the original pH and coagulants.
KW - Coagulation-ultrafiltration
KW - Floc characteristics
KW - Magnesium
KW - Membrane fouling
KW - OH/Al values
UR - https://www.scopus.com/pages/publications/84922357799
U2 - 10.1016/j.colsurfa.2015.01.036
DO - 10.1016/j.colsurfa.2015.01.036
M3 - 文章
AN - SCOPUS:84922357799
SN - 0927-7757
VL - 469
SP - 235
EP - 241
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
ER -