Temporal phenomena of hydrogen photobioproduction

The photobioproduction of hydrogen through in water alga systems has been studied as a suitable way for clean hydrogen generation from renewable solar energy and renewable bio-sources. There is evidence of such hydrogen path metabolism involving some algae types in stress conditions and it has been reported by several authors. In this paper some results of hydrogen production are shown for different stress conditions carried out in not full aseptic environment stabilized by antibiotics, Chlamydomonas reinhardtii has got resistance to. Oscillations and temporal phenomena of hydrogen production have been observed and studied by means of Fourier analysis. Their nature can be related to the variation of hydrogen production rate usually reflected on the cumulative hydrogen curves by the presence of shoulders or accentuated changes of slope.