Nitrification was greatly enhanced by intermittent artificial aeration,
resulting in nearly complete NH4-N removal. Sufficient carbon
source introduced from shunt distributing wastewater
greatly improved denitrification when effective nitrification and
anoxic or anaerobic conditions in lower matrix were created. High
average removal rates of COD (92.3%), NH4-N (90.2%) and TN
(88.1%) were obtained simultaneously in intermittent artificial aeration
and shunt distributing wastewater combined SWIS. The
results suggested that the combination of intermittent aeration
and shunt distributing wastewater could be a feasible strategy
for SWISs to obtain high organics and nitrogen removal.