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首页> 外文期刊>Environmental Science & Technology: ES&T >Enhancement of Ammonium Oxidation at Microoxic Bioanodes
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Enhancement of Ammonium Oxidation at Microoxic Bioanodes

机译：Enhancement of Ammonium Oxidation at Microoxic Bioanodes

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We achievedhigh ammonium oxidation rates at bioanodes byintroducing low levels of oxygen and revealed the rate limiting stepand the pathways of ammonium oxidation at bioanodes. Bioelectrochemicalsystems (BESs) are considered to beenergy-efficientto convert ammonium, which is present in wastewater. The applicationof BESs as a technology to treat wastewater on an industrial scaleis hindered by the slow removal rate and lack of understanding ofthe underlying ammonium conversion pathways. This study shows ammoniumoxidation rates up to 228 PLUSMN; 0.4 g-N m(-3) d(-1) under microoxic conditions (dissolved oxygen at 0.02-0.2mg-O-2/L), which is a significant improvement compared toanoxic conditions (120 PLUSMN; 21 g-N m(-3) d(-1)). We found that this enhancement was related to the formation ofhydroxylamine (NH2OH), which is rate limiting in ammoniumoxidation by ammonia-oxidizing microorganisms. NH2OH wasintermediate in both the absence and presence of oxygen. The dominantend-product of ammonium oxidation was dinitrogen gas, with about 75conversion efficiency in the presence of a microoxic level of dissolvedoxygen and 100 conversion efficiency in the absence of oxygen. Thiswork elucidates the dominant pathways under microoxic and anoxic conditionswhich is a step toward the application of BESs for ammonium removalin wastewater treatment.

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