Anammox for ammonia removal from pig manure effluents: Effect of organic matter content on process performance |
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| Authors: | Beatriz Molinuevo María Cruz García Dimitar Karakashev Irini Angelidaki |
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| Institution: | 1. Agricultural Technological Institute of Castilla and Leon, Finca Zamadueñas, Valladolid, Castilla and Leon, Spain;2. Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet 115, 2800 Kgs Lyngby, Denmark;1. Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China;2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;2. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China;3. Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;1. Bioengineering Laboratory, Department of Chemical Engineering, Faculty of Engineering, University of Concepción, P.O. Box 160-C, Correo 3, Concepción, Chile;2. Environmental Microbiology Laboratory, Department of Microbiology, Faculty of Biological Sciences, University of Concepción, P.O. Box 160-C, Correo 3, Concepción, Chile;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, Viña del Mar, E- 2503500, Chile;1. Swiss Federal Institute of Aquatic Science and Technology (EAWAG), 8600 Dübendorf, Switzerland;2. Ghent University, Laboratory for Microbial Ecology and Technology (LabMET), 9000 Gent, Belgium;3. Institute of Environmental Engineering, ETH Zürich, 8093 Zürich, Switzerland |
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| Abstract: | The anammox process, under different organic loading rates (COD), was evaluated using a semi-continuous UASB reactor at 37 °C. Three different substrates were used: initially, synthetic wastewater, and later, two different pig manure effluents (after UASB-post-digestion and after partial oxidation) diluted with synthetic wastewater. High ammonium removal was achieved, up to 92.1 ± 4.9% for diluted UASB-post-digested effluent (95 mg COD L?1) and up to 98.5 ± 0.8% for diluted partially oxidized effluent (121 mg COD L?1). Mass balance clearly showed that an increase in organic loading (from 95 mg COD L?1 to 237 mg COD L?1 and from 121 mg COD L?1 to 290 mg COD L?1 for the UASB-post-digested effluent and the partially oxidized effluent, respectively) negatively affected the anammox process and facilitated heterotrophic denitrification. Partial oxidation as a pre-treatment method improved ammonium removal at high organic matter concentration. Up to threshold organic load concentration of 142 mg COD L?1 of UASB-post-digested effluent and 242 mg COD L?1 of partially oxidized effluent, no effect of organic loading on ammonia removal was registered (ammonium removal was above 80%). However, COD concentrations above 237 mg L?1 (loading rate of 112 mg COD L?1 day?1) for post-digested effluent and above 290 mg L?1 (loading rate of 136 mg COD L?1 day?1) for partially oxidized effluent resulted in complete cease of ammonium removal. Results obtained showed that, denitrification and anammox process were simultaneously occurring in the reactor. Denitrification became the dominant ammonium removal process when the COD loading was increased. |
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