Simulation and optimizing of ethanol production by glycerol fermentations

Abstract

have demonstrated that atrazine has toxic effects in algae, aquatic plants, aquatic insects, fishes and mammals. Owing to the toxicity and persistence of atrazine in the environment, the search of microbial strains capable of degrading it is fundamental to the development of bioremediation processes, as corrective tools to solve the current problems of the irrational use of agrochemicals. This work aimed the isolation and identification of atrazine degrading bacteria from rizospheric soil, as well as the evaluation of their degradation capacity. Two different atrazine degrading bacteria were isolated and identified as belonging to the genera Arthrobacter and Corynebacterium. Arthrobacter sp. proved to be a better atrazine degrader by the appearance of transparent halos around the colonies when atrazine (0.1 g L −1 ) was the sole carbon and nitrogen source in the medium. In liquid medium, higher specific growth rate (0.0499 hour −1 ) was observed with Arthrobacter sp. when sodium citrate (1 g L −1 ) was an additional source of carbon.