Sulfidogenic activity of bacteria Desulfomicrobium sp. CrR3 under the influence of nitrite and sodium molybdate

Abstract

Sulfate reducing bacteria Desulfomicrobium sp. CrR3, selected from the wastewater of the city, do not accumulate biomass under the influence of nitrite and molybdate ions. These substances inhibit sulfidogenic activity of bacteria Desulfomicrobium sp. CrR3. Additon of nitrite at a concentration of 1 mM has virtually no effect on the accumulation of biomass and hydrogen sulfide by bacteria Desulfomicrobium sp. CrR3. The increasing the concentration of nitrite up to 5 mM biomass accumulation of bacteria Desulfomicrobium sp. CrR3 was inhibited by approximately 50% while the observed decrease in efficiency of sulfate compared with control. Molybdate at a concentration of 0.5–1 mM completely inhibits the growth and sulfidogenic activity of Desulfomicrobium sp. CrR3. Simultaneous action of nitrite and molybdate causes almost complete inhibition of Desulfomicrobium sp. CrR3 growth. Under these conditions the bacteria do not reduced sulfate and as a result do not accumulate hydrogen sulfide.