Performance of an UASB reactor treating synthetic wastewater at low-temperature using cold-adapted seed slurry |
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| Affiliation: | 1. Department of Chemical Engineering, University of La Frontera, Av. Francisco Salazar, 01145, Temuco, Chile;2. Scientific and Technological Bioresource Nucleus, University of La Frontera, Av. Francisco Salazar, 01145, Temuco, Chile;3. Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina, s/n, 47011, Valladolid, Spain;4. Department of Water Technology and Environmental Engineering, Faculty of Environmental Technology, Institute of Chemical Technology, Technická 5, 166 28, Prague 6, Czechia;1. Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering, Dr. Mergelina s/n, 47011, University of Valladolid, Valladolid, Spain;2. CADAGUA, Gran Via 45, Bilbao, Spain;1. Sub-Department of Environmental Technology, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands;2. School of Municipal and Environmental Engineering, Harbin Institute of Technology, 150090 Harbin, China;1. Department of Science and Engineering of Materials, Environment and Urban Planning-SIMAU, Faculty of Engineering, Marche Polytechnic University, 60131 Ancona, Italy;2. Department of Biotechnology, University of Verona, 37134 Verona, Italy;3. Department of Civil Engineering and Environmental Engineering, Institute of Environment, Health and Societies, Brunel University London, Uxbridge Campus, Middlesex, UB8 3PH Uxbridge, United Kingdom |
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| Abstract: | The present study is an attempt to investigate if a long-term acclimation of digester contents to low-temperatures would improve wastewater treatment at low-temperatures similar to mesophilic ranges. The feasibility of low-temperature (15 °C) anaerobic treatment of synthetic wastewater in an upflow anaerobic sludge blanket reactor was studied using inoculum from a cattle manure digester adapted to 15 °C. The effect of varying hydraulic retention time was studied by decreasing the retention time from 7 days to 1 day. Under a constant temperature of 15 °C with a hydraulic retention time of 1 day and a corresponding loading rate of 7.2 g-chemical oxygen demand (COD)/l/day, 90–95% removal efficiency was achieved. The methane production of 250 l/kg-COD removed at standard temperature pressure (STP) is a major highlight of the study complementing the high treatment efficiency achieved. Loading rates >5 g-COD/l/day was accompanied by increase in effluent volatile fatty acids (VFA) concentrations. Due to the presence of a high concentration of active granular sludge in the lower compartment of the reactor, 80% reduction of COD occurred within the granular bed of the reactor. Treatment of low strength wastewater for a short period showed 70–75% removal efficiencies with methane yield of 300 l/kg-COD removed. Specific methanogenic activity profiles of the anaerobic biomass revealed low-temperature (15 °C) optima, indicating selection of cold-active microorganisms during the acclimation process. The SMA assays also indicate the development of a putatively psychrophilic acetoclastic methanogenic community and biogas analysis showed 75% efficiency in energy recovery as methane. |
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