Effect of Ozone and Ozone/Persulfate Processes on Biodegradable and Soluble Characteristics of Semiaerobic Stabilized Leachate

This study investigated the effects of O-3 and O-3/S2O82- in the advanced oxidation process (AOPs) on the biodegradable and soluble characteristics of semiaerobic stabilized solid waste leachate. The biodegradability (BOD5/COD) ratio improved from 0.034 to 0.05 and 0.29 following O-3 and O-3/ S2O82-, respectively. Fractions of biodegradable COD(bi) (24%), nonbiodegradable COD(ubi) (76%), soluble COD(s) (59%), biodegradable soluble COD(bsi) (38%), nonbiodegradable soluble COD(ubsi) (62%), and particulate COD (PCOD) (41%) in stabilized leachate were also investigated. The fraction of COD ((bi)) increased to 28 and 39% after applying O-3 and O-3/ S2O82- in AOPs, respectively. COD(S) increased to 65 after O-3 and to 72% after O-3/AOPs, whereas COD ((bsi)) increased to 38 and 55% after O-3 and O-3/AOPs, respectively. The removal efficiency of total COD was obtained at 15 after O-3 alone and improved to 72% following ozone-based AOPs, whereas PCOD reduced from 41 to 35 after O-3 and 28% after ozone-based AOPs. Ozone/Prsulfate is an efficient method for degradation of stabilized leachate, enhanced biodegradability and improved biodegradable and soluble characteristics of stabilized leachate. (c) 2013 American Institute of Chemical Engineers Environ Prog, 33: 184-191, 2014