Wpływ wybranych pestycydów na pracę osadu czynnego

The pesticides under study were specific preparations produced on the basis of 2,4-dichlorophenoxyacetic acid and 4-chloro-2-methylphenoxyacetic acid. The objective of the investigations (carried out in a conventional activated sludge system) was to determine the influence of the pesticides on the biodegradation process. Consideration was given to the problem of how their presence in the wastewater affected organic matter removal, nitrification and sludge volume index. The toxicity oft he preparations was examined as well. Biocoenosis quality in the activated sludge system with pesticide degradation was compared with that in the reference system. The study has revealed the following: The presence of pesticides did not affect either organic matter removal or nitrification. There was only a slight deterioration of the sludge volume index, as well as an insignificant toxic effect on the biomass. The two sludge systems did not very much differ in the quality of their biocoenosis.