Characteristics of dissolved organic matters from different landfill leachate treatment processes
不同垃圾渗滤液组合处理工艺中DOM的变化特征

The ultraviolet spectra and fluorescence spectra are used to rapidly reveal the variation of dissolved organic matter (DOM) characteristics in two combination processes including two-pass RO (process A) and anaeration +aeration +MBR+ NF+ RO (process B) for landfill leachate treatment. The results indicated that the removal rates of COD and NH3-N were 98.7% and 99.0% for process A, and 98.8% and 98.6% for process B, respectively. The ultraviolet spectra analysis showed that aromatic and unsaturated compounds slightly decreased and the stability of aromatic compounds with aliphatic chain was weaken in those processes. These results were confirmed by the values of SUVA254 and E253/E203 decreasing from 0.74 and 0.33 to 0.015 and 0.014 in process A, and from 0.46 and 0.12 to 0.010 and 0.012 in process B. Moreover, the 3DEEM of DOM indicated that the concentrations of fulvic-like and protein-like compounds decreased and the degree of aromatization was reduced. The further analysis suggested that a good removal efficiency of fulvic-like compounds by two-pass RO system was achieved in process A. Tyrosine-like compounds were mainly removed by microbial degradation, and a good retention effect of fulvic-like compounds and humic-like compounds could be obtained by NF-RO in process B.