Biological hydrogen generation in the presence of excess sludge

The possibility of the application of excess sludge in the photobiochemical hydrogen generation was tested. It was found that the non-treated or thermally hydrolyzed sludge was completely inactive. The hydrogen evolution was found only for the alkaline hydrolysis. During the optimization of the process, the best conditions for hydrogen generation were established: medium containing 20 - 50% of alkaline hydrolizate containing 10 or 20% of total solids (TS).