TY - JOUR
T1 - Application of microbial electrolysis cells to treat spent yeast from an alcoholic fermentation
AU - Sosa-Hernández, Ornella
AU - Popat, Sudeep C.
AU - Parameswaran, Prathap
AU - Alemán-Nava, Gibrán Sidney
AU - Torres, Cesar
AU - Buitrón, Germán
AU - Parra-Saldívar, Roberto
N1 - Funding Information:
The authors are grateful to the National Council of Science and Technology (Consejo Nacional de Ciencia y Tecnología) from México, for the scholarship #CVU 420136 granted to the student and principal author, Ornella Sosa Hernández. The authors gratefully acknowledge the Research Laboratory for Advanced Processes for Water Treatment (LIPATA) at the Academic Unit Juriquilla of the Engineering Institute (UNAM), for the support in the accomplishment of the present study and also to the Water Center for Latin America and the Caribbean for its support with the facilities. We also wish to thank Dr. Diana L. Cárdenas-Chávez for her advice and writing assistance that enriched this work.
Publisher Copyright:
© 2015 The Authors. Published by Elsevier Ltd.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - Spent yeast (SY), a major challenge for the brewing industry, was treated using a microbial electrolysis cell to recover energy. Concentrations of SY from bench alcoholic fermentation and ethanol were tested, ranging from 750 to 1500mgCOD/L and 0 to 2400mgCOD/L respectively. COD removal efficiency (RE), coulombic efficiency (CE), coulombic recovery (CR), hydrogen production and current density were evaluated. The best treatment condition was 750mgCOD/LSY+1200mgCOD/L ethanol giving higher COD RE, CE, CR (90±1%, 90±2% and 81±1% respectively), as compared with 1500mgCOD/LSY (76±2%, 63±7% and 48±4% respectively); ethanol addition was significantly favorable (p value=0.011), possibly due to electron availability and SY autolysis. 1500mgCOD/LSY+1200mgCOD/L ethanol achieved higher current density (222.0±31.3A/m3) and hydrogen production (2.18±0.66 LH2/day/LReactor) but with lower efficiencies (87±2% COD RE, 71.0±.4% CE). Future work should focus on electron sinks, acclimation and optimizing SY breakdown.
AB - Spent yeast (SY), a major challenge for the brewing industry, was treated using a microbial electrolysis cell to recover energy. Concentrations of SY from bench alcoholic fermentation and ethanol were tested, ranging from 750 to 1500mgCOD/L and 0 to 2400mgCOD/L respectively. COD removal efficiency (RE), coulombic efficiency (CE), coulombic recovery (CR), hydrogen production and current density were evaluated. The best treatment condition was 750mgCOD/LSY+1200mgCOD/L ethanol giving higher COD RE, CE, CR (90±1%, 90±2% and 81±1% respectively), as compared with 1500mgCOD/LSY (76±2%, 63±7% and 48±4% respectively); ethanol addition was significantly favorable (p value=0.011), possibly due to electron availability and SY autolysis. 1500mgCOD/LSY+1200mgCOD/L ethanol achieved higher current density (222.0±31.3A/m3) and hydrogen production (2.18±0.66 LH2/day/LReactor) but with lower efficiencies (87±2% COD RE, 71.0±.4% CE). Future work should focus on electron sinks, acclimation and optimizing SY breakdown.
KW - COD removal
KW - Coulombic efficiency
KW - Hydrogen
KW - Microbial electrolysis cell
KW - Spent yeast
UR - http://www.scopus.com/inward/record.url?scp=84945162029&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84945162029&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2015.10.053
DO - 10.1016/j.biortech.2015.10.053
M3 - Article
C2 - 26512857
AN - SCOPUS:84945162029
VL - 200
SP - 342
EP - 349
JO - Agricultural Wastes
JF - Agricultural Wastes
SN - 0960-8524
ER -