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(77-13) Influence of synthetic pyrethroids on biodegradation processes. Kalka, Joanna*,1, Grabinska-Sota, Elzbieta1, Miksch, Korneliusz1, Figiel, Joanna1, 1 Silesian University of Technology, Environmental Biotechnology Department, Gliwice, Poland ABSTRACT- Since many organochlorine insecticides have been withdrawn from use because of evidence of their persistence in the environment, toxicity and bioaccumulation, other types, among them synthetic pyrethroids, are being introduced in many agricultural applications. Pyrethroids were found in natural waters in concentrations from 0,05 to 2.5 Key words: biodegradation, insecticides, pyrethroids |
g/dm3. In those concentrations they are hazardous to aquatic organisms. Because they are used in great number of commercial preparations synthetic pyrethroids can occur in wastewater. The results of investigations on biodegrability of some synthetic pyrethroids are presented. Commercial formulations of deltamethrin (Decis 2.5 EC), 
-cyflutrin (Bulldock 025 EC) and 
-cyhalotrin (Karate 025 EC) were examined. Biodegradation tests were conducted according to OECD guidelines for testing of chemicals (OECD Method 303 A). During the experiment it was found, that all preparations were biodegradable. COD reduction was greater than 75 %. Nitrification processes were slightly inhibited. It was also shown, that preparations caused impoverishment of activated sludge microflora.