Rapid filtration technology using a copper-based microfiltration membrane for high-concentration algae-laden water purification

Eutrophication and algal blooms are global environmental concerns. While traditional copper-based algicides are effective and cost-efficient， they cause secondary copper ion pollution and degrade water quality due to the accumulation of dead algae. This study introduces an innovative method for simultaneous algae removal and water purification using a copper-based microfiltration membrane that enables rapid treatment and facilitates high-quality water reuse. Through the oxidation effect of copper ions released at the membrane-water interface， the copper-based microfiltration membrane achieved 100% algae removal without additional chemicals. It combined physical interception with catalytic degradation， effectively eliminating a wide range of pollutants. The system removed 98.87% of turbidity while reducing ultraviolet absorbance， microcystin-LR concentrations， and total organic carbon by 28.54%， 42.9%， and 36.8%， respectively. Compared to traditional polymeric microfiltration membranes， the copper-based membrane demonstrated markedly enhanced efficiency in removing organic contaminants， significantly improving treated water quality and reuse potential. Through rapid hydraulic backwashing， the copper-based membrane effectively recovered its initial flux and maintained a consistent water flux of 65525.65 L/（m²·h）. The copper ion concentration in the filtrate remained at approximately 1.22×10⁻⁵ mol/L， well within the safety limits for drinking water. This study provides valuable insights for sustainable water treatment and aquatic ecosystem protection.