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¹ University of Tehran, Faculty of Natural Resources, Department of Fisheries, Karaj, Iran DOI : 10.4194/1303-2712-v19_01_03 Viewed : 4081 - Downloaded : 4441 Environmental pollution caused by heavy metals and pesticides have increased concerns over potential toxicity to a range of species, and their removal from water is of unquestionable importance. The present study was attempts to remove heavy metal, Arsenic and pesticides, Malathion and Diazinon from water using physical and biological methods. The physical remove of the pollutants was carried out through a particle trapping systems, contained straws to trap the fine and large particles. The system received 3 g montmorillonite as the absorbent media each 24 h during 10 days. A media containing algae, Anabaena sp. was also used for the biological treatment of the pollutants. The results showed that the montmorillonite particles in the particle trapping system were able to reduce the initial concentrations of pollutants. The removing efficiency of 78% and 58% were measured respectively for initial concentrations of 1 and 2 g/L Arsenic in the biological system. The biological treatment also reduced the initial levels of pesticides with the reduction efficacies of 68.3% and 71.6% for Diazinon and 40.5% and 67.8% for Malathion, respectively. In the both systems, pH increased gradually with the removal of contaminants. The results are discussed with regard to potency of particle trapping system supplemented montmorillonite and algae removal of pollutants from water solutions. Keywords : Particle trapping system, Montmorillonite, Algae, Water treatment, Pollution