The objective of the present work is to cultivate the micro-alga "Spirulina platensis" of Burkina Faso origin in two types wastes water, olive mill wastes and the used engines oils in the area of Tizi-Ouzou, with a view to reduce pollution. In order to minimize the pollution caused by these wastes water, we opted to enrich them with the solution of fig wood ash as a source of alkalinity. The culture was carried out at 30 and 37° C. To be able to clean up these wastes water as much as possible, the recycling effect was studied. Some culture parameters (pH, phycocyanin level (%), Spirulina yields (%)), the analysis of functional groups and the antimicrobial activity of the obtained spirulina powders were determined.

The results obtained show that recycling has a positive effect on the culture of S.platensis in both natural media. A more or less significant production of phycocyanin was observed, in particular in the two recycled media at 30°C. These results state that temperature does not affect on the phycocyanin production.

Spirulina issued from the used oils of engines is dark brown in color and is characterized by a high level of pigments and impurities. On the other hand, that from olive mill wastes is blue-green in color, which reveals the presence of phycocyanin, the latter being the source of this color.

The two Spirulina powders from both media contain hydroxyl and carbonyl groups. Consequently, they are highly recommended as a source of carbon to use in agriculture.