Membrane fouling mitigation by coupling applied electric field in membrane system: Configuration, mechanism and performance

摘要

Mitigating membrane fouling extensively occurred in membrane-based water treatment techniques in an efficient and durable way is a pressing challenge. The novel electro-assisted membrane coupling technology showed great potentials for tackling the problem. Foulants like charged natural organic matter, colloids and bacteria can be successfully repelled from membrane surface in the presence of electric field, contributing to less adoption, accumulation, and blocking. More importantly, the inactivation of microorganisms induced by electric field played a significant role in inhibiting the formation of the stubborn biofilm, which showed distinct and excellent advantages over other membrane fouling control approaches like surface hydrophilic modification, chemical cleaning, and pretreatment optimization. This thorough and long-term effective coupling means will actually open a new sight for membrane fouling mitigation fields. Herein, we reviewed the configuration of direct current (DC) membrane coupling technology to control membrane fouling, fouling alleviating mechanisms, and membrane filtration performances of DC electric field membrane coupling process. Additionally, some potential drawbacks and corresponding strategies were also discussed; hopefully to supply some viewpoints for prospective developments in membrane fouling mitigation fields.