1. Numerical assessment of nitrogen removal from swine wastewater in activated sludge systems: Comparison between continuous and intermittent aeration
- Author
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Tomoko Yasuda, Yasuyuki Fukumoto, Fabrice Béline, Albert Magrí, Miyoko Waki, NATIONAL AGRICULTURE AND FOOD RESEARCH ORGANIZATION INSTITUTE OF LIVESTOCK AND GRASSLAND SCIENCE ANIMAL WASTE MANAGEMENT AND ENVIRONMENT RESEARCH DIVISION IBARAKI JPN, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Optimisation des procédés en Agriculture, Agroalimentaire et Environnement (UR OPAALE), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Laboratory of Chemical and Environmental Engineering (LEQUiA), and Universitat de Girona (UdG)
- Subjects
Environmental Engineering ,Nitrite ,020209 energy ,chemistry.chemical_element ,Bioengineering ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Nitrogen removal ,chemistry.chemical_compound ,0202 electrical engineering, electronic engineering, information engineering ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,Waste Management and Disposal ,Effluent ,0105 earth and related environmental sciences ,Simultaneous nitrification–denitrification ,Renewable Energy, Sustainability and the Environment ,Modeling ,DO control ,Numerical assessment ,Pulp and paper industry ,Nitrogen ,6. Clean water ,Activated sludge ,chemistry ,Swine wastewater ,Environmental science ,Aeration - Abstract
International audience; The appropriate conditions needed to achieve nitrogen (N) removal from swine wastewater (SW) in an activated sludge continuous stirred-tank reactor (+settler) were assessed by performing numerical simulations. Air supply was considered through continuous or intermittent aeration (CA vs. IA), and several values were assumed for the SW BOD5-to-N ratio. By considering CA and low dissolved oxygen (DO) levels, feasibility for peforming N removal via nitrite through simultaneous nitrification–denitrification was confirmed. Nitrogen removal via nitrite was also the case when applying IA, even at higher DO ranges. The nitrite short-cut was shown to reduce energy consumption for aeration. However, regardless of the aeration method applied, sensitive DO controls will be required, particularly when the SW BOD5-to-N ratio takes low values. This study allowed to assess the operational conditions required when biologically treating SW to meet N standards and to identify situations in which a final post-treatment is needed before effluent discharge.
- Published
- 2020