Performance and optimization of biological nitrogen removal process enhanced by anoxic/oxic step feeding |
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| Institution: | 1. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, PR China;2. School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, PR China;3. Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing, PR China;4. Department of Civil Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;1. Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze Ed. 8, 90100 Palermo, Italy;2. Department of Earth and Environmental Engineering, Columbia University, 500 West 120th Street, New York, NY 10027, USA;3. Water Research Group, Department of Civil Engineering, University of Cape Town, Rondebosch, 7700 Cape, South Africa;1. Department of Environmental Engineering, Federal Technological University of Paraná, Av. Dos Pioneiros 3131, CEP 86036-370, Londrina, Parana, Brazil;2. Department of Civil Construction, State University of Londrina, Rodovia Celso Garcia Cid, Km 380 e Campus Universitario, CEP 86057-970, Londrina, Parana, Brazil;3. Department of Food Engineering, State University of Ponta Grossa, Av. Gal. Carlos Cavalcanti 4748, CEP 84030-900, Ponta Grossa, Parana, Brazil;1. Department of Chemical Engineering, School of Engineering, Universidade de Santiago de Compostela, E- 15705 Santiago de Compostela, Spain;2. Aqualia, Guillarei WWTP, Camino de la Veiga s/n, E-36720 Tui, Spain;3. Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Avda. Padre Hurtado 750, 2503500 Viña del Mar, Chile;1. Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, via Gaetano di Biasio 43, 03043 Cassino, Italy;2. Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, via Claudio 21, 80125 Naples, Italy;1. Department of Biotechnology, Delft University of Technology, Julianalaan 67, Delft 2628 BC, the Netherlands;2. Department of Civil and Environmental Engineering, University of Florence, Via di S.Marta 3, 50139 Florence, Italy |
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| Abstract: | The aim of this paper is to investigate the performance and optimization of an biological nitrogen removal process enhanced by the anoxic/oxic four stages step-feeding process under sufficient/insufficient influent carbon source. The concept of influent flow distribution ratio (λ) was introduced according to the performance of the step-feed process for inflow splitting and volume distribution. Under the condition of sufficient carbon, the uniform influent flow distribution ratio was proposed from the standpoint of which is easy for process control, operation optimization and management. Under the condition of different influent C/N ratios, the optimal influent flow distribution ratios (λopt) were determined, by trial-and-error method. The results showed that more than 95.81% of the total nitrogen removal efficiency could be achieved by step-feeding process with a fixed influent C/N ratio. A model was introduced to derive the relationships of total nitrogen removal efficiency with λ and influent C/N ratio. When the influent carbon source was insufficient, however, the λopt between two adjacent stages should not be uniform. The results also showed that the four-stage step-feeding process with λopt of 2.0:2.1:2.5:3.4 could significantly improve the total nitrogen removal efficiency. The results obtained in this study will help to optimize the design and the operation of BNR systems. |
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