LAUSR

Abstract To develop a technology for the degradation of the toxic and refractory pollutants contained in landfill leachate reverse osmosis (RO) concentrate, a γ-Al2O3/O3 system was set up in this study. Landfill leachate RO concentrate was rejected from RO of biologically pretreated raw landfill leachate. First, its key operational parameters, including γ-Al2O3 dosage, ozone dosage, reaction temperature, treatment time, and initial pH value, were optimized through single-factor experiments. Under the optimal conditions, the chemical oxygen demand (COD) (70%) and color (100%) removal efficiencies could be obtained by the γ-Al2O3/O3 process. Meanwhile, the ratio of biochemical oxygen demand (BOD5) to COD (B/C ratio) was enhanced from 0.01 to 0.2, which suggests that its biodegradability was improved to some extent. Decomposition or transformation of organic pollutants in landfill leachate RO concentrate was analyzed by ultraviolet-visible spectroscopy, excitation–emission matrix fluorescence spectroscopy, a...