Study on biological function of oyster (Anodonta cygnea) in reducing chlorpyrifos organophosphate pesticide from aquatic environment

In today's world, the extensive human use of pesticides to control agricultural pests and their entry into water resources is a threat to aquatic ecosystems. In this study, Reduction of Chloriprifos organophosphate pesticide from aqueous environment was investigated by bioremediation method by Anodonta cygnea oyster as a bio filter. During a period of twelve days, three treatments with three replications were exposed to three different concentrations of pesticide, 30, 20, 15 mg / l. And indices of toxin concentration, light absorption, water pH and oyster filtration rate were measured to determine the reduction of toxin concentration. At the end of the experiment, the amount of pesticide concentration for treatments with concentrations of 30, 20 and 15 mg/L pesticides were 19 ± 0.1, 4.6 ± 0.153, 3 ± 0.133, with a reduction efficiency of 36.67%, 76.83%, 100% respectively. Percent, Light absorption rate 0.44 ± 0.001, 0.011 ± 0.002, 0.000 ± 0.000 with a reduction efficiency of 38.04%, 77.75%, 100% and a pH of 7.53, 99/7, 6/8 were estimated. Filtration rate for treatments with concentrations of 30 and 20 mg/L pesticides decreased and for treatment with 15 mg/L pesticide concentration had an increasing trend. There was a significant difference between changes in toxin concentration, light absorption miran and filtration rate at the beginning and end of the experiment (P˂0.05). Anodonta cygnea species as a suitable bioremediator for the removal of chlorpyrifos pesticides in agricultural wastewater treatment systems or contaminated natural water environments is recommended, however, further studies are needed in this area.