Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7077646 | Bioresource Technology | 2014 | 33 Pages |
Abstract
This study assesses the impact of organic loading rate on biohydrogen production from glucose in an up-flow anaerobic packed bed reactor (UAnPBR). Two mesophilic UAPBRs (UAnPBR1 and 2) were tested at organic loading rates (OLRs) ranging from 6.5 to 51.4 gCOD Lâ1 dâ1. To overcome biomass washout, design modifications were made in the UAnPBR2 to include a settling zone to capture the detached biomass. The design modifications in UAnPBR2 increased the average hydrogen yield from 0.98 to 2.0 mol-H2 molâ1-glucose at an OLR of 25.7 gCOD Lâ1 dâ1. Although, a maximum hydrogen production rate of 23.4 ± 0.9 L H2 Lâ1 dâ1 was achieved in the UAnPBR2 at an OLR of 51.4 gCOD Lâ1 dâ1, the hydrogen yield dropped by 50% to around 1 mol-H2 molâ1-glucose. The microbiological analysis (PCR/DGGE) showed that the biohydrogen production was due to the presence of the hydrogen and volatile acid producers such as Clostridium beijerinckii, Clostridium butyricum, Megasphaera elsdenii and Propionispira arboris.
Keywords
TSSsRTCSTRHRTLDPEOLRDGGETCODSCODSTPVSsDenaturing gradient gel electrophoresisBiohydrogenMolecular Evolutionary Genetic Analysisstandard temperature and pressurePacked bed reactorContinuous stirred tank reactorsSolids retention timehydraulic retention timeAttached biomasstotal suspended solidssoluble chemical oxygen demandVolatile suspended solidsMEGAOrganic loading ratepolymerase chain reactionPCRLow density polyethylenetotal chemical oxygen demand
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
Antônio Djalma Nunes Ferraz Júnior, Marcelo Zaiat, Medhavi Gupta, Elsayed Elbeshbishy, Hisham Hafez, George Nakhla,