Abstract:

Concentrated landfill leachate rejected by reverse osmosis（RO）was oxidized in H₂O₂/O₃ system. Performances of H₂O₂/O₃ oxidation，H₂O₂oxidation and O₃ oxidation were compared. The effects of initial pH，O₃ dosage and H₂O₂ dosage on the removal of color，humic substances and COD were investigated. And the degradation of humic acid（HA）and fulvic acid（FA）were studied，E₂₅₀/E₃₆₅（E₂/E₃）and E₂₄₀/E₄₂₀（E₂/E₄）were used to evaluate the degree of humification. The results demonstrated that for the removal efficiencies of color，humic substances and COD were achieved 97.72%，88.85% and 74.54% respectively at initial pH 8.0，O₃ dosage 5.02 g/L，H₂O₂ dosage 90 mmol/L，reaction time 30 min. The removal efficiency of HA was obviously higher than that’s of FA，and the degree of humification was reduced.

摘要：

采用H₂O₂/O₃体系处理经反渗透膜处理后的浓缩垃圾渗滤液，比较了H₂O₂/O₃体系和单独H₂O₂和单独O₃处理浓缩液；并考察了体系初始pH值、O₃投量、H₂O₂投量对H₂O₂/O₃体系降解浓缩液的色度、腐殖酸以及COD的去除的影响；以及考察了H₂O₂/O₃体系对浓缩液中大分子的胡敏酸（HA）以及中等分子量的富里酸（FA）的去除，并通过E₂₅₀/E₃₆₅（E₂/E₃）和E₂₄₀/E₄₂₀（E₂/E₄）的变化表征腐殖酸的腐殖度的变化。结果表明：H₂O₂/O₃体系的处理效果远好于单独H₂O₂和单独O₃处理；在pH值为8.0、O₃投量为5.02 g/h、H₂O₂投量为90 mmol/L、反应时间为30 min时，H₂O₂/O₃体系处理浓缩液的色度、腐殖酸和COD的去除率分别达到97.72%、88.85%和74.54%；O₃/H₂O₂氧化体系对HA的去除率高于FA，且经过O₃/H₂O₂氧化体系处理后浓缩液中腐殖酸分子量降低，腐殖化程度降低。