Temperature Dependence of the Processes of Acrylamide Biodegradation in River Silt Suspensions at Their Inoculation by Selected Bacterial Strains

The temperature dependence of the rate of acrylamide biodegradation by silt microorganisms of small rivers in the Perm krai is studied in the antropogenically polluted Danilikha River, flowing in the territory of Perm city, and the Syuz’va River’s relatively clear tributary in Nytvenskii district. The rate of acrylamide biodegradation increases after introducing into river silt the biomass of bacteria of strains Alcaligenes faecalis 2 and Acinetobacter guillouiae 11h, selected toward an increase in amidase activity. It is shown that, at the ambient temperature of 30°C, the complete degradation of 100 mM acrylamide solution by silt microbiocenosis from the Danilikha River and a tributary of the Syuz’va River has taken place by the 21st and 28th day, respectively, while at 5 and 16–20°C, acrylamide concentration has decreased only slightly even by the 63rd day. The introduction of the biomass of preselected bacteria considerably reduces the time required for complete degradation of acrylamide. At temperature 5°C, acrylamide utilization can take place only at inoculation of silts by the biomass of amidase-containing microorganisms. A mathematical model of acrylamide biodegradation in silt suspensions of small rivers is given; kinetic curves of changes in its concentration are presented, and temperature dependences of biodegradation rates are obtained for different variants of the process.