title: Enhancement of anaerobic biohydrogen/methane production from cellulose using heat-treated activated sludge.
abstract: Anaerobic digestion is an effective technology to convert cellulosic wastes to methane and hydrogen. Heat-treatment is a well known method to inhibit hydrogen-consuming bacteria in using anaerobic mixed cultures for seeding. This study aims to investigate the effects of heat-treatment temperature and time on activated sludge for fermentative hydrogen production from alpha-cellulose by response surface methodology. Hydrogen and methane production was evaluated based on the production rate and yield (the ability of converting cellulose into hydrogen and methane) with heat-treated sludge as the seed at various temperatures (60-97 degrees C) and times (20-60 min). Batch experiments were conducted at 55 degrees C and initial pH of 8.0. The results indicate that hydrogen and methane production yields peaked at 4.3 mmol H2/g cellulose and 11.6 mmol CH4/g cellulose using the seed activated sludge that was thermally treated at 60 degrees C for 40 min. These parameter values are higher than those of no-treatment seed (HY 3.6 mmol H2/g cellulose and MY 10.4 mmol CH4/g cellulose). The maximum hydrogen production rate of 26.0 mmol H2/L/d and methane production rate of 23.2 mmol CH4/L/d were obtained for the seed activated sludge that was thermally treated at 70 degrees C for 50 min and 60 degrees C for 40 min, respectively.
authors: Department of Environmental Engineering and Science, Feng Chia University, Taichung, Chinese Taiwan. p9521684@fcu.edu.tw
authors: C H
authors: CH
authors: Lay
authors: F Y
authors: FY
authors: Chang
authors: C Y
authors: CY
authors: Chu
authors: C C
authors: CC
authors: Chen
authors: Y C
authors: YC
authors: Chi
authors: T T
authors: TT
authors: Hsieh
authors: H H
authors: HH
authors: Huang
authors: C Y
authors: CY
authors: Lin
mesh_terms: D000693:Anaerobiosis; D002482:Cellulose / Q000737:chemistry / Q000378:metabolism*; D006358:Hot Temperature; D006859:Hydrogen / Q000737:chemistry / Q000378:metabolism*; D008697:Methane / Q000737:chemistry / Q000378:metabolism*; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification
chemical_list: D012722:Sewage; D006859:Hydrogen; D002482:Cellulose; D008697:Methane