LANDFILL LEACHATE TREATMENT BY FENTON'S REAGENT. THE VARIATION OF LEACHATE CHARACTERISTICS

摘要

The variation of young and old landfill leachate characteristics during Fenton process was investigated in a continuously stirred tank reactor (CSTR) as well as a semi-batch reactor. It was shown that both ammonia and nitrate-nitrogen changed little after treatment. The fluoride concentration markedly increased, while chloride remained relatively unchanged during the process. Chemical oxygen demand (COD), inorganic carbon (IC) and total organic carbon (TOC) decreased after Fenton process. Moreover, COD or TOC removal efficiency of old leachate was slightly better than that of young one, mainly due to the different high molecular weight (HMW) to low molecular weight (LMW) ratio in young and old landfill leachates. HMW was almost removed completely, compared with the relatively lower LMW removal efficiency.