Enhancing fermentative hydrogen production from sucrose.
This study evaluated the hypothesis that fermentative hydrogen production from organic-rich feedstock could be enhanced by supplementing with waste materials such as cattle manure that could provide nutritional needs, buffering capacity, and native hydrogen-producing organisms. This hypothesis was tested in batch reactors fed with sucrose blended with cattle manure run at 25 degrees C without any nutrient supplements, pH adjustments, buffering, or gas-sparging. Hydrogen production rates in these reactors ranged 16-30 mL H(2)/g DeltaCOD-day, while hydrogen content in the biogases ranged 50-59%. Compared to literature studies conducted at higher temperatures, hydrogen yields found in this study at 25 degrees C were higher in the range of 3.8-4.7 mol H(2)/mol sucrose added, with higher positive net energy yields (>14 kJ/L). This study demonstrated that cattle manure as a supplement could not only provide hydrogen-producing seed, nutritional needs, and buffering capacity, but also increase hydrogen yield by approximately 10%, improving the economic viability of fermentative biohydrogen production from sugary wastes.
Perera
Karnayakage Rasika J
KR
Civil Engineering Department, New Mexico State University, Las Cruces, NM 88003, USA.
Nirmalakhandan
Nagamany
N
D000818:Animals; D019149:Bioreactors; D002021:Buffers; D002417:Cattle; D005232:Fatty Acids, Volatile / Q000032:analysis; D005285:Fermentation / Q000502:physiology*; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008372:Manure; D010100:Oxygen / Q000032:analysis; D013395:Sucrose / Q000032:analysis / Q000378:metabolism*; D013696:Temperature; D013997:Time Factors
D002021:Buffers; D005232:Fatty Acids, Volatile; D008372:Manure; D013395:Sucrose; D006859:Hydrogen; D010100:Oxygen