Ozonation optimization of Dewatering Unit Effluent of Drilling Rig for COD Removal

چکیده مقاله

In this research, reduction of chemical oxygen demand (COD) value of drilling industry wastewater by advance oxidation has been investigated. Drilling wastewater treatment for mud preparation is one of the main challenges in drilling industry since it can cause high economic and environmental benefits. This research investigates treatment of an effluents of drilling operation through ozone as an advanced oxidation agent. For this purpose, all experiments are conducted using a gas distributor into an advance semi-batch photo-reactor which consists three UV lamps. Ozone is well dispersed at a dose of 5 g/h and effective transferred concentration of 2335 mg/L. The effects of initial presence of UV light, initial pH, and temperature were investigated on the studying parameters. According to the results, the highest removal rate occurred at 60 min reaction time. Also it has been observed that, for the initial COD concentration of 2300 mg/L, the ozonation process after 60 min resulted in 91% COD removal under optimum initial pH of 8.5 and optimum temperature of 20°C and presence of UV light.

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