Evaluation of Soluble BOD and Suspended Particles BOD Removal without and with Sediment in Different Velocities before and after Ozonation in an Industrial Wastewater Treatment

In this research, removing the values of BOD with and without sediment in two different methods in treatment of an industrial wastewater was experimented in order to evaluate the use of ozone in industrial wastewater treatment systems. Such wastewaters contain specific poisonous chlorinated phenolic combinations, which in biological reactors in a liquid phase could be absorbed much easier and with a high velocity. After the treatment, the measured soluble BOD and suspended particles BOD contents in the cyclic ozonation-biotreatment system compared to the soluble BOD and suspended particles BOD values in effluent from anaerobic bioreactor (without ozonation) with the consideration of three different sediment velocities (2.18, 1.09,0.73 cm/min.) and also without sediment. The comparison revealed that the removals in both were dramatically different and proved the remarkable efficiency of the cyclic ozonation-biotreatment system. By bio-ozone-bio treatment the value of consumed ozone was considerably increased, but through this way the quality of treatment and the value of dissolvable substances increased. In cyclic ozonation-biotreatment reactors liquids were passed sequentially and according to bio-ozone-biotreatment method, and it showed when ozone is consumed very quickly, no ozone can enter the reactor.