Prefermentation to overcome nutrient limitations in food processing wastewater: Comparison of pilot- and bench-scale systems |
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| Institution: | 1. Wales Centre of Excellence for Anaerobic Digestion, University of South Wales, Pontypridd, CF37 1DL, UK;2. Sustainable Environmental Research Centre, Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd, CF37 1DL, UK;3. Hazen and Sawyer, Vice President & Residuals Group Practice Leader, One South Broad Street, Suite 1630, Philadelphia, PA 19107, USA;4. Welsh Water, Nelson, Treharris CF46 6LY, UK;1. Division of Environmental and Water Resources Engineering, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;2. Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore;1. Institut für Mikrobiologie, Universität Innsbruck, Technikerstraße 25d, 6020 Innsbruck, Austria;2. Hochschule Hamm-Lippstadt, Biotechnologie, Marker Allee 76-78, 59063 Hamm, Germany |
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| Abstract: | A bench- and a pilot-scale anaerobic/aerobic system were evaluated for the treatment of high strength tomato-processing wastewater. The pilot-scale anaerobic tank achieved better prefermentation of organic carbon and nitrogen than the bench-scale system, although overall system performance was comparable with more than 99% SBOD removal and 97% SCOD removal. Hydraulic retention time (HRT) and temperature effects were studied in the bench-scale system. Increase of anaerobic HRT from 0.25 day to 0.5 day favored prefermentation and a better effluent quality was achieved, as demonstrated by reduction in TSS concentrations from 66 mg/L to 24 mg/L, SCOD from 103 mg/L to 78 mg/L and SBOD from 8 mg/L to 6 mg/L, respectively. Specific oxygen uptake rate (SOUR) increased from 0.15–0.23 mg O2/mg VSS day at 25 °C to 0.67–1.24 mg O2/mg VSS day at 32 °C. Settling characteristics deteriorated from sludge volume index (SVI) of 24–131 mL/g at 25 °C to 115–173 mL/g at 32 °C. Sludge yield decreased from 0.14 g VSS/g COD at 25 °C to 0.098 g VSS/g COD at 32 °C. |
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