Our research line is dedicated to study Hydrogen (H2) metabolism in alga such as Chlamydomonas reinhardtii but also in consortium using alga and bacteria. H2 is a very interesting renewable fuel that does not release CO2 after combustion, and that can be easily interconvertible with electricity, allowing the transport and storage of renewable energy. The general objective of our research is to understand 1) how algae produce H2, 2) develop the bases for a new approach to produce bioH2 using algae-bacteria consortia (photoH2 together + dark fermentative H2), and 3) remediate wastewater using those microorganisms. This approach aims to combine the natural algal capacity for H2 photoproduction using water and sunlight with the powerful and versatile bacterial ability to produce fermentative H2 while remediating different types of wastewater. Microalgae are able to grow photoautotrophically and heterotrophically using diverse organic carbon sources. They are known to be pollutant scavengers for a broad range of chemicals derived from the domestic, industrial and agricultural sectors. Besides the usual organic and inorganic compounds present in wastewater (i.e., nitrates, phosphates, ammonium), microalgal cells can also bioremediate many xenobiotics. Moreover, farming wastewater represents a suitable ecosystem for the simultaneous growth of microalgae and bacteria. In this context, we work with wastewater derived from dairy and olive oil sectors and propose to simultaneously bioremediate them, and valorize the algal biomass obtained as biofertilizer, feed, and hydrogen production.