The characteristics of the ozone-anaerobic treatments of phenol wastewater were studied in a laboratory scale wastewater treatment system. The ozone treatment of wastewater was carried out in a batch-type reactor. The ozonizing time, initial pH of wastewater, volumetric flow rate and ozone concentration of aerating gas were maintained as 140 min, 10, 1.5ℓ/min and 30 mg/ℓ. The anaerobic reactor was maintained at a temperature of 35℃ and a hydraulic retention time of 24 hours. In the ozonation with successive anaerobic degradation, the ozonizing stage gave removal efficiencies of phenol and COD as 77% and 33%, respectively. The overall removal efficiencies of phenol and COD could be obtained over the whole treatment as 97% and 70%, respectively. However, the anaerobic degradation was ineffective and could not be used as an energy source due to producing a small amount of low calorific biogas. The intermediates formed by ozonation of phenol seemed hard to decompose in the anaerobic treatment. In conclusion, the ozonation reactor with successive anaerobic reactor is unsuitable due to losing the advantage of anaerobic treatment that is to obtain the considerable amount of fuel gas.
III. 결과 및 고찰