Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6634215 | Fuel | 2016 | 8 Pages |
Abstract
The present investigation deals with Rhodopseudomonas palustris sp. grown, using acetate, for purposes of hydrogen generation. All experiments were carried out using a lab-scale photobioreactor. The cultures were irradiated with a 150Â W (OSRAM power star HQI-TS) lamp impinging on the reactor surface an irradiance of 74Â W/m2. Three different growth regimens were compared: batch, fed-batch, and semi-continuous. In the third approach, two daily dilutions were applied, in order to operate the photobioreactor at two hydraulic retention times: 240Â h in the first semi-continuous regimen (SC240h) and 60Â h in the second (SC60h). The best performances were attained when operating the photobioreactor in fed-batch mode. A maximum hydrogen production rate of 15.21Â mL(H2)/LÂ h was achieved. The hydrogen yield (YH) was 1.60Â mol H2/mol acetic acid in SC240h; 1.42Â mol H2/mol acetic acid when the culture was operated in fed-batch mode, and 0.85Â mol H2/mol acetic acid under a batch growth regimen. YH decreased to 0.36Â mol H2/mol acetic acid in SC60h. Significant changes in the oxidation-reduction potential were noted among the selected growth regimens tested then and also over time.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Giulia Padovani, Sigita VaiÄiulytÄ, Pietro Carlozzi,