Start-up alternatives and performance of an UASB pilot plant treating diluted municipal wastewater at low temperature |
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| Authors: | Alvarez J A Ruiz I Gómez M Presas J Soto M |
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| Institution: | 1. Dept. of Química Física e Enxeñaría Química I, University of A Coruña, A Zapateira s/n, 15071 A Coruña, Galiza, Spain;2. Aquagest S.A. EDAR Silvouta, 15896 Santiago de Compostela, Galiza, Spain;1. Center for Resource and Environmental Research, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Chaoyang District, Beijing 100029, PR China;2. Department of Water Supply and Environmental Engineering, Arba Minch University, P.O. Box 21, Arba Minch, Ethiopia;1. School of Engineering and Resources, Walailak University, Nakhon Si Thammarat 80161, Thailand;2. Renewable Energy Research unit, Walailak University, Nakhon Si Thammarat 80161, Thailand;3. Department of Biology, Faculty of Science, Thaksin University, Patthalung 93110, Thailand;4. Research Center in Energy and Environment, Thaksin University, Phatthalung 93110, Thailand;5. School of Industrial Technology, Universiti Sains Malaysia, Penang, 11800, Malaysia |
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| Abstract: | Different start-up procedures of an upflow anaerobic sludge bed (UASB) digester were carried out. Start-up without inoculum (experiment A) was delayed for about 120 day. The digester reached 75-85% total suspended solids (TSS) removal, 54-58% total chemical oxygen demand (TCOD) removal and 63-73% biological oxygen demand (BOD5) removal at influent concentrations of 240-340 mg TCODil-1, temperatures of 13.5-15 degrees C and hydraulic retention times (HRT) of 10-11 h. Digested sludge was used as inoculum in experiment B. After the start-up period of 75 days, digester efficiencies were 58%, 41% and 54% for TSS, TCOD and BOD5 removal, respectively, working at 169 mg TCODil-1, temperature of 14 degrees C and HRT of 11 h. The sludge bed developed and stabilised quickly when using a hydraulically adapted inoculum (experiment C), but TCOD and BOD5 removals remained low and volatile fatty acids (VFA) accumulated in the effluent. |
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