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Acidogenic and methanogenic fermentation of causticized straw
Author(s) -
Baccay Romeo A.,
Hashimoto Andrew G.
Publication year - 1984
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260260811
Subject(s) - acidogenesis , methanogenesis , chemistry , fermentation , substrate (aquarium) , yield (engineering) , straw , nuclear chemistry , methane , chromatography , food science , anaerobic digestion , inorganic chemistry , organic chemistry , materials science , ecology , biology , metallurgy
The effects of pretreatment process variables [straw concentration between 20 and 90 kg volatile solids (VS)/m 3 , temperature between 30 and 85°C, and alkaline dosage between 0 and 80 g NaOH/kg VS] on acidogenesis and methanogenesis were investigated. Rates of acidogenesis and methanogenesis were determined using firstorder kinetics, and ultimate acid and methane yields were measured. The acid yield was not affected by pretreatment concentration or temperature, but increased as alkaline dosage increased. The acidogenesis rate was not affected by pretreatment temperature or alkaline dosage, but decreased as the substrate concentration increased. This decrease in the acidogenesis rate was attributed to a decrease in the inoculum: substrate ratio as the substrate concentration increased. The methane yield and methanogenesis rate were not affected by pretreatment substrate concentration or temperature, and both increased with alkaline dosage up to about 40 g NaOH/kg VS, then remained relatively constant above 40 g NaOH/kg VS.