Optimum Ozone Dosage of Preozonation and Characteristic Change of Refractory Organics in Landfill Leachate

摘要

abstract_textpPreozonation on landfill leachate was carried out. COD removal rate has an obvious inflection at ozone dosage 0.186 mg(O3)/mg(COD) in ozonation process. Seven sets of identical O-3-SBR combined process under different ozone dosages were studied. The results indicated that the best COD removal rate of synergetic effect is also at 0.186 mgO3/mgCOD. New organic substances produced after ozonation was confirmed by an excitation-emission matrix (EEM). Carbon dioxide production increased from 36.3 mg to 75.7 mg after ozonation, confirming that biodegradability of refractory organics in landfill leachate was enhanced. All the arguments indicated that the inflection point of COD removal by ozonation has a great significance for preozonation./p/abstract_text