Ozone Usage in Wastewater Treatment of a Paper Industry for Removing Soluble and Suspended Chemical Oxygen Demand

In this research, removal of Suspended and Soluble Chemical Oxygen Demand (COD) with and without sediment in treatment of an industrial wastewater system before and after ozonation was studied and compared. A case study of a paper industry wastewater treatment is reported to prove the suitability of ozonation for COD removal. The ozone application as an end treatment is used to provide a perfect oxidation yield of organic matter in a landfill leachate. The combination of ozonation and biological process appears quite effective for the post-treatment of biological effluents from paper industry. Wastewaters of pulp factories which are by-products of cellulose cause a hazardous water vapor that is dangerous because of containing different combinations of chlorophenol. After the treatment, the measured soluble and suspended COD contents in the cyclic ozonation-biotreatment system compared to the ones in the treatment method without ozonation. Sedimentation was also considered in this experiment. The average percent reduction in total COD due to ozone addition was 32.5, 34, 46.3 and 60 in without sediment, and with maximum sediment velocity of 2.18, 1.09 and 0.73 cm/min respectively. The comparison proved the remarkable efficiency of the cyclic ozonation-biotreatment system in removing COD both with and without sediments.