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Enhanced mesophilic bio-hydrogen production of raw rice straw and activated sewage sludge by co-digestion

Alemahdi, Nika LU (2015) In International Journal of Hydrogen Energy 40(46). p.16033-16044
Abstract
In this study, batch biohydrogen production by co-digestion of raw rice straw and activated sewage sludge was investigated with different inoculum heat treatment, pH, S/X ratio (based on VS) and substrate sizes under mesophilic condition. In order to achieve a high bio-hydrogen yield and methanogens activity inhibition, heat treatment of inoculum was optimized at different exposure times (30, 45 & 60 min) and temperature ranges (80, 90 and 100 °C) prior to dark fermentation process. Collected data was analysed using response surface methodology (RSM). The heat treatment of inoculum at 100 °C for 60 min produced the highest bio-hydrogen yield of 14.22 NmL H2/g VS at concentration of 70.97% and Production of 0.073 NmL CH4/g VS at 0.17%... (More)
In this study, batch biohydrogen production by co-digestion of raw rice straw and activated sewage sludge was investigated with different inoculum heat treatment, pH, S/X ratio (based on VS) and substrate sizes under mesophilic condition. In order to achieve a high bio-hydrogen yield and methanogens activity inhibition, heat treatment of inoculum was optimized at different exposure times (30, 45 & 60 min) and temperature ranges (80, 90 and 100 °C) prior to dark fermentation process. Collected data was analysed using response surface methodology (RSM). The heat treatment of inoculum at 100 °C for 60 min produced the highest bio-hydrogen yield of 14.22 NmL H2/g VS at concentration of 70.97% and Production of 0.073 NmL CH4/g VS at 0.17% concentration in total produced biogas. The raw rice straw was also co-digested with heat-treated inoculum at different ratios of volatile solids (2:1, 4:1 and 6:1) and initial pH (4, 4.75 and 5.5) as numerical variables and 4 categories of substrate size ((250–500 μm], (500 μm-2mm], (2–20 mm), [20–30 mm]). The highest bio-hydrogen yield of 14.70 NmL/g VS was recognized at the optimum initial pH of 5.01 and S/X ratio of 4.54:1 using 2–20 mm rice straw. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bio-hydrogen, Co-digestion, Activated sewage sludge, Rice straw, Response surface methodology, S/X ratio
in
International Journal of Hydrogen Energy
volume
40
issue
46
pages
11 pages
publisher
Elsevier
external identifiers
  • Scopus:84955422586
ISSN
0360-3199
DOI
10.1016/j.ijhydene.2015.08.106
language
English
LU publication?
yes
id
856e6567-4db7-4ebc-87b1-1fb01603d7b3
date added to LUP
2016-04-12 11:32:55
date last changed
2016-10-13 05:06:01
@misc{856e6567-4db7-4ebc-87b1-1fb01603d7b3,
  abstract     = {In this study, batch biohydrogen production by co-digestion of raw rice straw and activated sewage sludge was investigated with different inoculum heat treatment, pH, S/X ratio (based on VS) and substrate sizes under mesophilic condition. In order to achieve a high bio-hydrogen yield and methanogens activity inhibition, heat treatment of inoculum was optimized at different exposure times (30, 45 & 60 min) and temperature ranges (80, 90 and 100 °C) prior to dark fermentation process. Collected data was analysed using response surface methodology (RSM). The heat treatment of inoculum at 100 °C for 60 min produced the highest bio-hydrogen yield of 14.22 NmL H2/g VS at concentration of 70.97% and Production of 0.073 NmL CH4/g VS at 0.17% concentration in total produced biogas. The raw rice straw was also co-digested with heat-treated inoculum at different ratios of volatile solids (2:1, 4:1 and 6:1) and initial pH (4, 4.75 and 5.5) as numerical variables and 4 categories of substrate size ((250–500 μm], (500 μm-2mm], (2–20 mm), [20–30 mm]). The highest bio-hydrogen yield of 14.70 NmL/g VS was recognized at the optimum initial pH of 5.01 and S/X ratio of 4.54:1 using 2–20 mm rice straw.},
  author       = {Alemahdi, Nika},
  issn         = {0360-3199},
  keyword      = {Bio-hydrogen,Co-digestion,Activated sewage sludge,Rice straw, Response surface methodology,S/X ratio},
  language     = {eng},
  number       = {46},
  pages        = {16033--16044},
  publisher    = {ARRAY(0x796c2b0)},
  series       = {International Journal of Hydrogen Energy},
  title        = {Enhanced mesophilic bio-hydrogen production of raw rice straw and activated sewage sludge by co-digestion},
  url          = {http://dx.doi.org/10.1016/j.ijhydene.2015.08.106},
  volume       = {40},
  year         = {2015},
}