Review article

One of the ways to improve the energy and ecology efficiency of biological treatment plants performance could be a wider application of microorganisms that are able to use the chemical elements with a variable valence as terminal electron acceptors in the technology of wastewater treatment from organic and mineral pollution. Replacing of specially dispersible oxygen used in the traditional aerobic wastewater treatment for chemically bonded or already present in drains oxygen will allow solving the problem of the of wastewater treatment. Basically all reported chromate-reducing bacterial strains belong to the obligatory or optionally anaerobic microorganisms as well as to the aerobes able to proceed to anaerobic respiration. In order to prove it, the capacity of the latter to use chrome (6+) as a terminal electron acceptor instead of a common oxidant - oxygen was investigated. The test objects of the research were the Pseudomonas bacteria strains unspecialized to chrome (6+) which are incapable to recover nitrate and characterized as the strict aerobes. The researches allow giving preliminary conclusions that the collection strains not only of aerobic bacteria but also bacteria which are traditionally regarded as the obligatory aerobes of such taxonomic groups like Bacillus sp., Azotobacter sp., Mycobacteium sp., Micrococcus sp. are able to use chrome (6+) as the terminal electron acceptor at the oxidation of organic compounds.