Influence of biogas-induced mixing on granulation in UASB reactors |
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| Authors: | Puspendu Bhunia M.M. Ghangrekar |
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| Affiliation: | aEnvironmental Engineering Section, Department of Civil Engineering, Motilal Nehru National Institute of Technology, Allahabad 211004, India;bEnvironmental Engineering and Management Section, Department of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, India |
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| Abstract: | Studies have been carried out to correlate biogas-induced mixing and granulation in upflow anaerobic sludge blanket (UASB) reactors, treating low-strength as well as high-strength biodegradable wastewaters. A dimensionless granulation index (GI) has been framed taking into account the mixing in sludge bed due to produced biogas. Analysis of full-scale, pilot-scale and lab-scale UASB reactors treating actual wastewaters reveals the significance of biogas-induced mixing, represented by GI, on granulation of biomass in the reactors. For obtaining proper granulation in UASB reactors (percentage granules greater than 50%, w/w), resulting in higher chemical oxygen demand (COD) removal efficiency, it is recommended to maintain GI values in the range of 15,000–57,000. |
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| Keywords: | Granulation Granulation index (GI) Mixing UASB Velocity gradient |
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