Cultivation of aerobic granular sludge for rubber wastewater treatment

► Aerobic granular sludge showed excellent settling ability and sludge volume index. ► A COD removal rate of 96.5% was observed at an OLR of 3.7 kg COD m−3 d−1. ► Ammonia and total nitrogen removal efficiencies were 94.7% and 89.4%, respectively.