Isolation and selection of native microorganisms for the aerobic treatment of simulated dairy wastewaters |
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| Authors: | Lyliam Loperena Mario Daniel Ferrari Ana Laura Díaz Guzmán Ingold Leticia Verónica Pérez Francisco Carvallo Dayana Travers Rodolfo Javier Menes Claudia Lareo |
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| Institution: | 1. Dept. Bioingeniería, Instituto de Ingeniería Química, Facultad de Ingeniería, Universidad de la República, J. Herrera y Reissig 565, 11300 Montevideo, Uruguay;2. Cátedra de Microbiología, Facultad de Química, Universidad de la República, Gral. Flores 2124, 11800 Montevideo, Uruguay;1. RealCME, New York, NY;2. AXIS Medical Education, Fort Lauderdale, FL;1. Department of Biomolecular Sciences, University of Urbino Carlo Bo, Italy;2. Department of Earth, Life Sciences & Environment, University of Urbino Carlo Bo, Italy;3. Department of Base Sciences and Foundations, Chemistry Section, University of Urbino Carlo Bo, Italy;4. Department of Science and Engineering of Matter, of Environment and Urban Planning, Polytechnic University of Marche, Ancona, Italy;1. Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B9000 Gent, Belgium;2. Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), University of Bologna, Via Terracini, 28, 40131 Bologna, Italy |
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| Abstract: | Milk fat/protein degrading microorganisms were isolated from different locations of a dairy wastewater treatment system with the goal of developing an inoculum for bioaugmentation strategies. Eight isolates, identified by 16S rRNA gene sequence analysis as belonging to the genera Bacillus, Pseudomonas, and Acinetobacter, were tested for their ability to remove COD and protein from a milk-based medium (3000 mg/L COD) and compared to a commercial bioaugmentation inoculum. The Acinetobacter isolate exhibited a pellet-type growth in liquid culture, a property that could potentially aid in the separation of microbes and liquid phase following treatment. Based on the individual degradation capacity and growth behavior of the isolates, three microorganisms were further selected and tested together. This consortium exhibited a COD removal similar to the commercial inoculum (57% and 63%, respectively), but higher protein (consortium: 93%; commercial inoculum: 54%), and fat removals (consortium: 75%; commercial inoculum: 38%). |
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