Biohydrogen and carboxylic acids production from wheat straw hydrolysate.
Hydrolyzed wheat straw was converted into carboxylic acids and biohydrogen using digesting bacteria. The fermentations were carried out using both free and membrane-encased thermophilic bacteria (55°C) at various OLRs (4.42-17.95g COD/L.d), in semi-continuous conditions using one or two bioreactors in a series. The highest production of biohydrogen and acetic acid was achieved at an OLR of 4.42g COD/L.d, whilst the highest lactic acid production occurred at an OLR of 9.33g COD/L.d. Furthermore, the bioreactor with both free and membrane-encased cells produced 60% more lactic acid compared to the conventional, free-cell bioreactor. In addition, an increase of 121% and 100% in the production of acetic and isobutyric acid, respectively, was achieved in the 2nd-stage bioreactor compared to the 1st-stage bioreactor.
Swedish Centre for Resource Recovery, University of Borås, 50190 Borås, Sweden. Electronic address: konstantinos.chandolias@hb.se.
Konstantinos
K
Chandolias
Samarkand Agricultural Institute, 140103 Samarkand, Uzbekistan.
Sindor
S
Pardaev
Swedish Centre for Resource Recovery, University of Borås, 50190 Borås, Sweden.
Mohammad J
MJ
Taherzadeh
D019149:Bioreactors / Q000382:microbiology*; D002264:Carboxylic Acids / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D005285:Fermentation; D006859:Hydrogen / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D006868:Hydrolysis; D014908:Triticum / Q000737:chemistry / Q000378:metabolism
D002264:Carboxylic Acids; D006859:Hydrogen
Biohydrogen; Carboxylic acids; Membrane-encased cells; Two-stage digestion; Wheat straw hydrolysate