Journal
ENERGIES
Volume 15, Issue 22, Pages -Publisher
MDPI
DOI: 10.3390/en15228355
Keywords
Rhodopseudomonas sp; photobioreactor; calcium alginate; photofermentation; hydrogen production
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The present investigation focuses on the potential of Rhodopseudomonas sp. cells to produce clean energy, such as molecular hydrogen (H-2). The cells were immobilized in calcium alginate gel beads and cultured in a cylindrical photobioreactor to enhance H-2 production. The maximum H-2 production rate reached 5.25 mL/h with a total output of 505 mL and a light conversion efficiency of 1.20%.
The present investigation concerns the potentiality of Rhodopseudomonas sp. cells to produce clean energy such as molecular hydrogen (H-2). The abovementioned goal could be reached by improving the capability of purple non-sulfur bacteria to produce H-2 via a photofermentative process through the enzyme nitrogenase. Rhodopseudomonas sp. cells were immobilized in calcium alginate gel beads and cultured in a cylindrical photobioreactor at a working volume of 0.22 L. The semi-continuous process, which lasted for 11 days, was interspersed with the washing of the beads with the aim of increasing the H-2 production rate. The maximum H-2 production rate reached 5.25 +/- 0.93 mL/h with a total output of 505 mL. The productivity was 40.9 mu L (of H-2)/mg (of cells)/h or 10.2 mL (of H-2)/L (of culture)/h with a light conversion efficiency of 1.20%.
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