Assessment of a UASB reactor with high ammonia concentrations: Effect of zeolite addition on process performance |
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| Institution: | 1. Departamento de Ingeniería Química, Universidad de Santiago de Chile, Ave. Lib. Bernardo O’Higgins 3363, Santiago de Chile, Chile;2. Departamento de Ingeniería Química y Ambiental, Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, Chile;3. Instituto de la Grasa (CSIC), Avda. Padre García Tejero 4, 41012 Sevilla, Spain;1. Universidad de Santiago de Chile, Santiago, Chile;2. CODELCO, Proyecto Nuevo Nivel Mina, Santiago, Chile;3. Universidad de Oviedo, Asturias, Spain;1. Department of Chemistry, M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation;2. D. V. Skobeltsyn Institute of Nuclear Physics, M. V. Lomonosov Moscow State University, 119991 Moscow, Russian Federation;3. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation;1. Departamento de Ingeniería Informática, Universidad de Santiago de Chile, Av. Ecuador 3659, Estación Central, Santiago, Chile;2. Center of Mathematical Modelling (CMM) UMI CNRS 2807, Universidad de Chile, Av. Blanco Encalada 2120, Piso 7, Santiago, Chile;3. Departamento de Ingeniería Industrial, Universidad de Chile, República 701, Santiago, Chile;4. Departamento de Ingeniería Informática, Universidad de Santiago de Chile, Av. Ecuador 3659, Estación Central, Santiago, Chile;1. Laboratory of Membrane Separation Processes (LabProSeM), Department of Chemical Engineering, University of Santiago de Chile, Chile;2. Food Packaging Laboratory, Department of Food Science and Technology, Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago de Chile, Chile;1. Departamento de Ingeniería en Minas, Facultad de Ingeniería, Universidad de Santiago, Chile;2. Laboratorio de Modelado Geológico (LaMoGe), Instituto de Estudios Andinos Don Pablo Groeber, Universidad de Buenos Aires, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina;3. Laboratorio de Tectónica Andina, Instituto de Estudios Andinos Don Pablo Groeber, Universidad de Buenos Aires, Departamento de Ciencias Geológicas, Buenos Aires, Argentina;4. Laboratorio de Modelación Analógica, Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Chile;5. Escuela de Ciencias de la Tierra, Universidad Andrés Bello, Santiago, Chile |
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| Abstract: | The UASB process for wastewater treatment has been extensively studied, but the use of zeolite to improve UASB reactor performance has rarely been explored. In this study, a UASB reactor modified with natural zeolite operating at high nitrogen concentrations (0.5, 0.7 and 1 g/L) was evaluated. Two laboratory bioreactors, one with zeolite and one without, were operated at ambient temperatures ranging between 18 °C and 21 °C. The experimental phase had a start-up period of 21 days. In the reactor with zeolite, the pH was found to be between 7.9 and 9.1, with a COD removal efficiency of about 60% after 80 days of operation at ammonia concentrations of between 0.229 and 0.429 g/L in the effluent. In the reactor without zeolite, the pH was between 8.3 and 9.3, and the COD removal efficiency was about 40% at ammonia concentrations between 0.244 and 0.535 g/L in the effluent. The addition of zeolite also decreased the volatile suspended solids (VSS) concentration in the effluent, generating a biomass with larger granules and higher settling rates as compared to a UASB reactor without zeolite. Taking the lower ammonia concentration, the higher COD removal and the improved granulation into account, it can be concluded that natural zeolite positively influenced the behavior and performance of the UASB reactor operating with high nitrogen concentrations. |
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| Keywords: | Ammonia UASB Zeolite Granulation COD removal |
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