Nitrogen Removal Strategy from Baker’s Yeast Industry Effluents

Résumé

Wastewaters from baker’s yeasts industry effluent have a high organic contamination. The classical biological treatments under aerobic and anaerobic conditions lead to a good efficiency in removing the organic carbon, but regarding nitrogen efficiency is variable. To obtain a good efficiency in removing nitrogen, the effluents must pass through all different stages of nitrogen cycle (i.e. ammonification, nitrification and denitrification), catalyzed by the activated sludge microbiota involved in the bioconversion processes from the organic nitrogen to the gaseous nitrogen. The biological processes involved in nitrogen removal from wastewaters of baker’s yeast industry are also dependent in physical and chemical conditions in which the activated sludge microbiota work to mineralize the organic compounds or to bio-convert them in to gases.