Abstract
In the contribution at hand two main concepts of photobioreactors are considered: the flat-panel reactor and the tubular reactor. Both reactors are investigated under outdoor conditions in Germany in the summer time for their applicability for H 2 production by means of purple non-sulphur bacteria Rhodobacter capsulatus. The experiments are performed as fed batch. The performance of a photobioreactor is evaluated in terms of H 2 productivity per IRS (illuminated reactor surface). It is demonstrated that both reactors could be operated stable for several weeks with comparable H 2 productivities. The mean hydrogen productivity for the panel and the tubular reactor is 3690 ml H 2/(m IRS 2 d) and 3350 ml H 2/(m IRS 2 d) respectively. While approximately 8 m 2 of the illuminated reactor surface of the panel reactor can be installed on 1 m 2 of ground space, the relation of the illuminated reactor surface to the ground area for the tubular reactor is approximately 1–1.
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