As it is shown in fig.2 even with biological treatment can be suitable for meeting the standard level of turbidity in this wastewater, but as it was recorded and revealed in the figure below turbidity of the wastewater with ozonation treatment causes a very remarkable decrease from step 9 by 20 (NTU) while it was recorded 30 (NTU) at the same step and 50 (NTU) in almost all previous steps. It is obvious that this parameter not only is below the standard level for the moment effluent depletion which is 50 (NTU), but also the removal trend to end of the Bio-ozone-bio treatment remains well. It should be mentioned that the standard value of turbidity for effluent depletion to surface water and leaching pits is 50 (NTU).