title: Effect of hydraulic retention time on anaerobic hydrogenesis in CSTR.
abstract: The objective of this work was to evaluate the production of hydrogen in a continuous system as a function of hydraulic retention time (HRT). The intermediates accumulated and other parameters of pH, oxidation-reduction potential were quantified. The heat treatment (103 degrees C for 24 h) of the compost from a cattle dung composting facility was able to select H2-producing spores; this product was used as a seed for continuous systems. The brewery waste was used as substrate. For the eight runs with combinations of five HRTs and four pHs, the results indicate that at pH=5.5, a maximum H2 production of 47% H2 concentration, 43 ml H2/g COD(added), and 3.1 l H2/l reactor d was achieved at HRT=18 h. Nevertheless, at HRT=18 h, pH 5.5 was also the optimum pH for the maximum H2 production among four pHs evaluated from 5 to 6.5. There was a significant accumulation of volatile acid and alcohols during the entire study.
authors.affiliation: Department of Safety and Environmental Engineering, National Kaohsiung First University of Science and Technology, No. 1 University St., Yanchau 824, Kaohsiung, Taiwan. ksfan@ccms.nkfust.edu.tw
authors.forename: Kuo-Shuh
authors.initials: KS
authors.lastname: Fan
authors.forename: Ni-ru
authors.initials: NR
authors.lastname: Kan
authors.forename: Jiuun-jyi
authors.initials: JJ
authors.lastname: Lay
mesh_terms: D000438:Alcohols / Q000378:metabolism; D000693:Anaerobiosis; D000818:Animals; D019149:Bioreactors / Q000382:microbiology; D001709:Biotechnology; D002417:Cattle; D005232:Fatty Acids, Volatile / Q000096:biosynthesis; D006859:Hydrogen / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D013997:Time Factors
chemical_list: D000438:Alcohols; D005232:Fatty Acids, Volatile; D007220:Industrial Waste; D006859:Hydrogen