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Temperature dependency of granule characteristics and kinetic behavior in UASB reactors
Author(s) -
Chou HsinHsien,
Huang JuSheng,
Hong WenFeng
Publication year - 2004
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.999
Subject(s) - acidogenesis , granule (geology) , methanogenesis , chemistry , mesophile , anaerobic exercise , anaerobic digestion , phenol , pulp and paper industry , sequencing batch reactor , volatile suspended solids , chemical engineering , methane , activated sludge , environmental engineering , wastewater , environmental science , materials science , organic chemistry , biology , bacteria , physiology , engineering , composite material , genetics
When an inhibitory substrate, phenol, was treated under mesophilic conditions (25, 30, 35, and 40 °C), the upflow anaerobic sludge bed (UASB) reactors at 30 °C resulted in the greatest amount of biomass and the largest granule size, while the UASB reactors at 25 °C resulted in the smallest granule size and the greatest amount of wash‐out of sludge. The granule size tended to be negatively correlated with the amount of wash‐out of sludge. With an increase in temperature, the kinetic constant k for anaerobic phenol degradation increased and the half saturation constant ( K s ) decreased. The mass fraction of methanogens ( f ) increased with increasing operational temperature in the UASB reactors and the activation energy ( E a ) for acetate methanogenesis was larger than that for phenol acidogenesis in the batch reactors, indicating that the operational temperature imposes a more influential effect on methanogens than on acidogens. From the results of the activity of acidogens and methanogens (expressed in specific COD utilization rate), the rate‐limiting step is phenol acidogenesis. Copyright © 2004 Society of Chemical Industry