Iranian Journal of

Background and Objectives: Water pollution by pesticides has adverse effects on the  environment and  human health, as well .In recent years, advanced oxidation processes,  have been gone through to a very high degree for pesticides removal. Poly-Aluminum chloride (PAC) used  for water treatment, can be effective on pesticides removal. The aim of this research was to study the use of UV/O3 and PAC in the removal of pesticides from drinking water.
Materials and Methods: In  this descriptive- analytical survey, specific concentrations of pesticides (1,5,10,15,20 ppm)namely Diazinon, Chlorpyrifos, Carbaril were prepared through addition to deionized water. Dichloromethane was used for samples&apos extraction, samples extracted with Liquid- Liquid & Solid-phase extraction ,  finally entered  bath  reactor at pH (6,7,9)  .The samples then exposed to UV/O3at contact time  of (0.5,1,1.5 and 2 hours) . In the PAC pilot , the effects of various concentrations of  pesticides, and PAC - ranging (12/24 and 36 ppm)  were  investigated  for the efficacy of pesticides removal. All samples analyzed by GC/MS/MS and HPLC.
Results: It was found that  in UV/O3 reactor, with the rise of  pH, decrease in  pesticides concentration, and rise of contact time, the efficiency of removal  increased too. In  the PAC pilot, increase in  PAC concentration  and decrease  in pesticides concentration , both increased the efficiency. Besides, both of the methods  showed high efficiencies in the removal of both pesticides,i-e. halogenated Organophosphorus (Chlorpyrifos) , non- halogenated Organophosphorus (Diazinon) at the degree of over (%80 ) In case of carbamate pesticides (e.g. Carbaril) efficiency was over (>%90). One-Way Anova & Two -Way Anova were used to analyze the obtained data.
Conclusion: According these results these two methods  are suggested for the removal of pesticides from aqueous solutions.