Abstract: The process of the present invention involves intermixing of industrial waste waters with household-communal waste waters with subsequent biochemical reduction of perchlorates and chlorates contained in said waters under anaerobic conditions by means of a strain of the microorganism Vibrio dechloraticans Cuznesove B-1168 grown by way of successive inoculations on a liquid nutrient medium containing sources of carbon, nitrogen, and phosphorus under anaerobic conditions in the presence of a perchlorate as a donor of oxygen; said strain having the following morphological characteristics and physiological properties: single cells, size 0.8-1.times.0.5-0.4.mu. mobile with one flagella of 1.5-2.mu.

Abstract: A method of biological purification of industrial effluents from chromates and bichromates, wherein industrial effluents are mixed with domestic sewage and then the chromates and bichromates contained therein are biochemically reduced under anaerobic conditions using a strain of Bacterium dechromaticans Romanenko B-1167 microorganism, selected by repeated seeding on liquid nutrient medium containing sources of carbon, nitrogen, phosphorus, under anaerobic conditions, in the presence of potassium chromate in the function of oxygen donor, followed by separation from the seeding on a meat-infusion agar under aerobic conditions without chromate, the strain having the following morphological features and physiological properties: small bacilli of about 1.2 micron long and 0.