title: Hydrogen bio-production through anaerobic microorganism fermentation using kitchen wastes as substrate.
abstract: In order to treat the kitchen wastes and produce hydrogen, anaerobic fermentation technology was used in this experiment. The results showed that the fermentation type changed from mixed acid fermentation to ethanol fermentation in a continuous stirred tank reactor (CSTR) 22 days after start-up. The maximum efficiency of hydrogen bio-production in the CSTR was 4.77 LH(2)/(L reactor d) under the following conditions: organic loading rate (OLR) of 32-50 kg COD/(m(3) d), oxidation reduction potential (ORP) of -450 to -400 mV, influent pH value of 5.0-6.0, effluent pH value of 4.0-4.5, influent alkalinity of 300-600 mg/l, temperature of 35 +/- 1 degrees C and hydraulic retention time (HRT) of 7 h. An artificial neural network (ANN) model was established, and each parameter influencing the performance of the reactor was compared using the method of partitioning connection weights (PCW). The results showed that OLR, pH, ORP and alkalinity could influence the fermentation characteristics and hydrogen yield of the anaerobic activated sludge; with an influence hierarchy: OLR > pH values > ORP > alkalinity. An economic analysis showed that the cost of producing hydrogen in this experiment was less than the cost of electrolysis of water.
authors.affiliation: College of Power and Energy Engineering, Harbin Engineering University, Harbin, Hei Long-jiang Province, China. realshiyue@sohu.com
authors.forename: Yue
authors.initials: Y
authors.lastname: Shi
authors.forename: Xiu-Tao
authors.initials: XT
authors.lastname: Zhao
authors.forename: Peng
authors.initials: P
authors.lastname: Cao
authors.forename: Yinyin
authors.initials: Y
authors.lastname: Hu
authors.forename: Liang
authors.initials: L
authors.lastname: Zhang
authors.forename: Yan
authors.initials: Y
authors.lastname: Jia
authors.forename: Zeqi
authors.initials: Z
authors.lastname: Lu
mesh_terms: D001421:Bacteria, Anaerobic / Q000378:metabolism*; D019149:Bioreactors; D003198:Computer Simulation; D005191:Family Characteristics; D005285:Fermentation; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D013696:Temperature; D018505:Waste Management / Q000379:methods*; D014866:Waste Products
chemical_list: D014866:Waste Products; D006859:Hydrogen