title: Selective production of organic acids in anaerobic acid reactor by pH control.
abstract: The selective production of organic acids by anaerobic acidogenesis with pH control was examined using a chemostat culture. The results showed that the product spectrum in the acid reactor strongly depended on the culture pH. Under acidic and neutral conditions, the main products were butyric acid, while acetic and propionic acids were the main products under the basic condition. This phenomenon was reversible between the acidic and basic conditions, and was not affected by the dilution rate. The change in the main products was caused by the change in the dominant microbial populations, from butyric acid-producing bacteria to propionic acid-producing bacteria in the acid reactor due to the pH shift. The control of culture pH was considered to be a useful way for controlling the product spectrum in the anaerobic acid reactor.
authors: Department of Chemical System Engineering, Kitami Institute of Technology, Hokkaido, Japan. horiuchi@betta.chem.kitami-it.ac.jp
authors: J I
authors: JI
authors: Horiuchi
authors: T
authors: T
authors: Shimizu
authors: K
authors: K
authors: Tada
authors: T
authors: T
authors: Kanno
authors: M
authors: M
authors: Kobayashi
mesh_terms: D019342:Acetic Acid / Q000737:chemistry; D000693:Anaerobiosis; D019149:Bioreactors; D020148:Butyric Acid / Q000737:chemistry; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D008962:Models, Theoretical; D011422:Propionates / Q000737:chemistry; D013997:Time Factors
chemical_list: D011422:Propionates; D020148:Butyric Acid; C029658:propionic acid; D019342:Acetic Acid