Enhancement of struvite generation and anti-fouling in an electro-AnMBR with Mg anode-MF membrane module

•NH4+ and PO43- co-precipitated with Mg2+ generating from the sacrificial Mg anode and were recovered as struvite.•High-purity struvite can be partly deposited on and separated from cathode plate.•Electric field improved the cake layer structure, thus mitigating membrane fouling.•Electrochemical reactions provided alkalinity and effectively inhibited anaerobic acidification.