Strategies to mitigate N₂O emissions from biological nitrogen removal systems

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• 作者：Joachim Desloover ; Siegfried E Vlaeminck ; Peter Clauwaert ; Willy Verstraete ; Nico Boon ^{Nico.Boon@UGent.be}
• 刊名：Current Opinion in Biotechnology
• 出版年：2012
• 期刊代码：23_09581669
• 类别：imm
• 出版时间：June, 2012
• 卷：23
• 期：3
• 页码：474-482
• 文件大小：421 K

摘要

N₂O emissions from the biological treatment of sewage, manure, landfill leachates and industrial effluents have gained considerable interest among policy makers and environmental scientists. Estimated global emission rates from these sources can contribute up to 10%of the anthropogenic N₂O emissions. Particularly at the level of a treatment plant, the N₂O impact can be very significant and reach up to 80%of the operational CO₂ footprint. Imperfect nitritation by an imbalance in the two-step nitritation metabolism of ammonia-oxidizing bacteria is considered as the main contributor to N₂O production with hydroxylamine and particularly nitrite as key precursors. Monitoring of these compounds is warranted to understand and abate N₂O emissions. Mitigation strategies should also comprise optimizations of the process parameters as well as bio-augmentative approaches empowered to restore the functional capacity and to deal with unwanted accumulation of intermediates. These strategies require validation for their effectiveness and costs at full-scale.