Scale up of panel photobioreactors for hydrogen production by PNS Bacteria

Avcıoğlu, S. Gökçe
Production of hydrogen from biomass through the use of dark and photofermentative bacteria will be applicable in the future and a promising route. The aim of this study is to develop and to scale-up solar panel photobioreactors for the biological hydrogen production by photosynthetic purple non sulfur (PNS) bacteria on artificial substrates and on real dark fermentation effluent of molasses. The parameters studied are light intensity, temperature, feed stock, feed rate, pH, cell density, light and dark cycle and carbon to nitrogen ratio on hydrogen production. Continuous hydrogen production has been achieved on artificial medium and dark fermentor effluent of molasses containing acetate and lactate by Rhodobacter capsulatus wild type and (hup-) mutant strains in panel photobioreactors in indoor and outdoor conditions by fed batch operation. Laboratory (from 4 to 8 liters) and large scale (20 L) panel photobioreactors by using various designs and construction materials were developed. In this photobioreactors continuous hydrogen production was achieved by feeding. Na2CO3 can be used as buffer to keep the pH stable during long term operation on molasses dark fermentor effluent. The adjustment of the feedstock by dilution and buffer addition were found to be essential for the long term stability of pH, biomass and H2 production for both in indoor and outdoor applications.
Citation Formats
S. G. Avcıoğlu, “Scale up of panel photobioreactors for hydrogen production by PNS Bacteria,” M.S. - Master of Science, Middle East Technical University, 2010.