Ozonation of biologically-treated municipal solid waste leachate using an integrated process of O3/Ca(OH)2 and microbubble reactor

The ozonation process was limited by the relatively low solubility in liquid and low transfer mass efficiency. In this work, O-3/Ca(OH)(2) was adopted to treat biologically-treated municipal solid waste (MSW) leachate in a microbubble gas-liquid reactor. The residual COD concentration is meeting the discharge standard after treatment. The effects of operating parameters such as Ca(OH)(2) dosage, external reactor pressure, liquid temperature, inlet ozone concentration and ozone flow rate on COD removal and mineralization (TOC removal) were studied systematically. This process was able to remove 89.86% of COD, 65.35% of TOC and 92.12% of UV-254 under the optimal conditions. And the intensification mechanism of O-3/Ca(OH)(2) system was explored through analysing the change of UV-254, 3D-EEM and the organic matters present in the leachate.