title: Hydrogen and methane production, energy recovery, and organic matter removal from effluents in a two-stage fermentative process.
abstract: This study evaluates the potential for using different effluents for simultaneous H(2) and CH(4) production in a two-stage batch fermentation process with mixed microflora. An appreciable amount of H(2) was produced from parboiled rice wastewater (23.9 mL g(-1) chemical oxygen demand [COD]) and vinasse (20.8 mL g(-1) COD), while other effluents supported CH(4) generation. The amount of CH(4) produced was minimum for sewage (46.3 mL g(-1) COD), followed by parboiled rice wastewater (115.5 mL g(-1) COD) and glycerol (180.1 mL g(-1) COD). The maximum amount of CH(4) was observed for vinasse (255.4 mL g(-1) COD). The total energy recovery from vinasse (10.4 kJ g(-1) COD) corresponded to the maximum COD reduction (74.7 %), followed by glycerol (70.38 %, 7.20 kJ g(-1) COD), parboiled rice wastewater (63.91 %, 4.92 kJ g(-1) COD), and sewage (51.11 %, 1.85 kJ g(-1) COD). The relatively high performance of vinasse in such comparisons could be attributed to the elevated concentrations of macronutrients contained in raw vinasse. The observations are based on kinetic parameters of H(2) and CH(4) production and global energy recovery of the process. These observations collectively suggest that organic-rich effluents can be deployed for energy recovery with sequential generation of H(2) and CH(4).
authors: Laboratory of Biological Processes, Center for Research, Development and Innovation in Environmental Engineering, São Carlos School of Engineering, University of Sao Paulo, João Dagnone, 1100 Santa Angelina, CEP 13563-120 São Carlos, Brazil. peixoto@sc.usp.br
authors: Guilherme
authors: G
authors: Peixoto
authors: Jorge Luis Rodrigues
authors: JL
authors: Pantoja-Filho
authors: José Augusto Bolzan
authors: JA
authors: Agnelli
authors: Marlei
authors: M
authors: Barboza
authors: Marcelo
authors: M
authors: Zaiat
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology; D005285:Fermentation; D006859:Hydrogen / Q000737:chemistry / Q000378:metabolism*; D007700:Kinetics; D008697:Methane / Q000737:chemistry / Q000378:metabolism*; D009930:Organic Chemicals / Q000737:chemistry / Q000378:metabolism*; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry / Q000382:microbiology*
chemical_list: D006859:Hydrogen; D008697:Methane; D009930:Organic Chemicals; D062065:Wastewater