Isolation and characterization of heterotrophic nitrifying and aerobic denitrifying Klebsiella pneumoniae and Klebsiella variicola strains from various environments

This study is one of only a few works to successfully isolate K. pneumoniae with heterotrophic nitrification and aerobic denitrification abilities in various natural environments. The physiological characterization K. variicola as having abilities to heterotrophically nitrify and aerobically denitrify is the first to be reported. Moreover, this study may provide alternative microbial resources for the removal of nitrogen from wastewater.