ocsillator system lucidity performance in turbidity removal abstract

background: ocsillator system is recognized by many water plant treatment designers for having many advantages, such as combination of mixing processes, flocculation and sedimentation processes in the same unit, the possibility of softening and lucidity simultaneously, and relatively acceptable efficiency. despite using this process in number of the regions in the country, enough researches have not been under taken on the actual performance and the pilot-scale. methods: in this study, to investigate the ocsillator system performance in turbidity removal a system was designed in pilot scale and operated in controlled condition (25 o c and ph=7.2) using chemical coagulants (pacl and fecl3) and different conditions of turbidity, coagulant dose and detention time. findings: the results indicated that there was significant deference between the detention time and turbidity of outlet water (r=0.98 and p<0.05). maximum efficiency of the system in turbidity removal was 95% while the injected coagulant dose (fecl3) was 10 mg / l after detention time of 240 minutes. so the inlet turbidity of 100ntu decreased to 5ntu. conclusion: fecl3 efficiency in the turbidity removal is more than pacl.