期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 461, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2023.132670
关键词
Sulfate radical; Incineration leachate; Persulfate; Electrical energy per order
This study compares and evaluates the UV/PS and heat/PS systems for advanced treatment of biologically pre-treated incineration leachate. The results show that the UV365 nm/PS system has the highest removal efficiency for various pollutants. Moreover, the study highlights the potential interference of PS on COD detection.
This study compared and evaluated the ultraviolet/persulfate (UV/PS) at 254 or 365 nm and heat/persulfate (heat/PS) systems for advanced treatment of biologically pre-treated incineration leachate. The UV365 nm/PS system with the highest removal reduced chemical oxygen demand (COD) by 81.7%, total organic carbon by 73.8%, NH3-N by 96.8%, total nitrogen by 47.3%, and color by 98.6% within 24 h, separately. Kinetics tests suggested that a highest concentrations of 4.8 x 10(-10) M for [SO4 center dot-](ss) and 2.8 x 10(-11) M for [center dot OH](ss) were reported in UV365/PS and UV254/PS systems, respectively. Characterization of leachate organic matter species revealed that low molecular weight organic matter < 5 kDa was preferentially degraded in three systems. Ketones are relatively easily degraded by both heat/PS and UV/PS systems, whereas esters were the most recalcitrant. Three-dimensional fluorescence analysis revealed > 99% humic acid and fulvic acid removal in all three systems. In practical applications, it is crucial to consider the pH and toxicity of SR-AOPs in the treatment of bio-treated incineration leachate. Furthermore, the ecotoxicity of MBR effluent treated by the heat/PS system and UV365 (nm)/PS system increased, which was caused by the strong acidity exhibited in the systems. In addition, we found that PS could interfere with 3.3% of the COD's detection. The findings of this study suggest that secondary effects of PS on water quality at high doses should be investigated in future research.
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