Abstract
To reduce nitrous oxide (N 2O) emissions from fill-and-draw type activated sludge units treating swine wastewater, the N 2O emission was compared between the continuous aeration process (conventional process) and the intermittent aeration process. About 35% of the influent nitrogen was emitted as N 2O gas using the conventional process under 0.5 kg·m −3·d −1 BOD loading. About 60% of the N 2O was emitted duing the first hours of aeration started just after daily charging. On the other hand, only less than 1% of the influent nitrogen was emitted as N 2O gas during the intermittent aeration process.
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