This study was to investigate the metabolic characteristics of cyanobacteria in organic waste-treatment systems in order to gain a better understanding of their physiological contributions during biological waste-treatment. This in turn would provide some valuable insight into the role of cyanobacteria in the microbial community as well as their potential impact on waste-treatment efficiency. Nostoc muscorum, Synechococcus PCC7942, Spirulina platensis and Anabaena cylindrica have varying tolerance potential to organic compounds and the order of tolerance was almost same in all the strains. We...