Effect of ozonation on reduction of volume and mass of waste activated sludge

Abstract: The effect of ozonation on sludge treatment was investigated. The main objective of this research was to asses the effectiveness of different ozone doses on sludge disintegration and mineralization, for which the parameters of TS, TSS, VS and settlable solids were chosen. The results 3 indicate that the ozone at doses between 0.125 to 2 gO g TS reduced TS, TSS and VS between 15.4% -1 to 80.7%, 8.3% to 47.9% and 5.8% to 45.9%, respectively. It can be concluded from these results that the ozone could mineralize a high fraction of volatile solids so that the minimum reduction of VS in waste activated sludge required by EPA was achievable via ozonation. Ozonation also improved the settlabilty of the sludge which resulted in reducing the sludge volume. Reduction of sludge volume can decrease the cost of its handling