Published: Jan. 1, 2023

Membrane fouling is the main challenge that limits ultrafiltration (UF) membrane long-term application. Coagulation, as an effective pretreatment method, not only reduce pollutants loaded on surface, but also transform membrane-pollutant contact into pollutant-floc reaction. Zircon (Zr) salts have drawn wide attention a novel metal-based coagulant because of its excellent coagulation performance. In present study, three types Zr coagulants zirconium tetrachloride (ZrCl4) and polyzirconium chloride (PZC), / Poly dimethyl diallyl ammonium (PZC/PDMDAAC) were estimated in terms removal organic mitigation fouling. Results showed PZC1.5/P2 presented best performance under acidic neutral conditions due to better bridging affinity sweeping ability. 8 mg/L dosage could effectively remove turbidity (98.27%) dissolved carbon (DOC) (59.04%) during process. Furthermore, pre-coagulation by induced transformation from cake filtration thoroughly intermediate blocking particulate matter would prevent reversible fouling-induced flux decline, whereas elimination was benefit for promoting UF efficiency mitigating irreversible Besides, Derjaguin-Landau-Verwey-Overbeek (XDLVO) analysis foulants became more hydrophilic coagulated PZC1.5/P2, adhesion between surface greatly weakened. All improvement originated flocs structure contributed with improved normalize (J/J0) 0.50 0.75, larger decrease 82.27% 91.27%, respectively. More important, exhibited performances treatment actual water Wolf Mushan reservoir, which demonstrated Zr-based promising practical application purification.

Language: Английский