TY - JOUR
ID - 10.1016/j.jes.2021.03.046
TI - Effects of different Ca2+ behavior patterns in the electric field on membrane fouling formation and removal of trace organic compounds
AU - Zhen Du
AU - Min Ji
AU - Ruying Li
VL - 34
IS - 1
PB -
SP - 292
EP - 300
PY -
JF - Journal of Environmental Sciences
JA - J. Environ. Sci.
UR - http://www.jesc.ac.cn/jesc_en/ch/reader/view_abstract.aspx?file_no=S1001074221001339&flag=1
KW - Corresponding author.;Electric field;Membrane fouling;2+;Flocs formation;Trace organic compounds
AB - The effects of Ca2+ on membrane fouling and trace organic compounds (TrOCs) removal in an electric field-assisted microfiltration system were investigated in the presence of Na+ alone for comparison. In the electric field, negatively charged bovine serum albumin (BSA) migrated towards the anode far away from the membrane surface, resulting in a 42.9% transmembrane pressure (TMP) reduction in the presence of Na+ at 1.5 V. In contrast, because of the stronger charge shielding of Ca2+, the electrophoretic migration of BSA was limited and led to a neglectable effect of the electric field (1.5 V) on membrane fouling. However, under 3 V applied voltage, the synergistic effects of electrochemical oxidation and bridging interaction between Ca2+ and BSA promoted the formation of denser settleable flocs and a thinner porous cake layer, which alleviated membrane fouling with a 64.5% decrease in TMP and nearly 100% BSA removal. The TrOCs elimination increased with voltage and reached 29.4%–80.4% at 3 V. The electric field could prolong the contact between TrOCs and strong oxidants generated on the anode, which enhanced the TrOCs removal. However, a stronger charge shielding ability of Ca2+ weakened the electric field force and thus lowered the TrOCs removal.
ER -