膜-生物反应器中溶解性有机物的三维荧光分析

采用三维荧光技术研究了膜-生物反应器(MBR)处理生活污水过程及膜污染物中溶解性有机物(DOM)的变化,并与传统的厌氧/缺氧/好氧(AAO)活性污泥工艺进行了对比.结果表明,生活污水DOM中主要的荧光物质有类蛋白质(荧光峰A和B)及类腐殖质(荧光峰C),经MBR处理后,荧光峰的强度降低了16%~35%,同时类蛋白质的结构也发生了变化.与好氧段滤液相比,溶解性膜污染物中类腐殖质含量较低,主要的荧光物质为分子量较小、共轭性较弱的类蛋白质.AAO工艺中厌氧段加强了对荧光峰A和C的去除,处理过程中类蛋白质结构的变化与MBR工艺有显著不同.

Excitation-emission matrix fluorescence spectra analysis of dissolved organic matter in membrane bioreactor

Fluorescence spectrum of dissolved organic matter (DOM) in domestic wastewater and membrane foulants during membrane bioreactor (MBR) treatment process was analysed and the comparison of DOM between MBR and traditional anaerobic/anoxic/aerobic process was also carried out. The fluorescent components in domestic wastewater DOM were mainly protein-like (Peak A and Peak B) and humic-like fluorophores (Peak C). The fluorescent intensity reduced by 16%~35% and the structure of protein-like fluorophores changed during the MBR treatment process. Decrease of the number of conjugated bonds and the molecule size in the protein-like structure had been observed in dissolved membrane foulants. And the membrane foulants contained less humic-like matter than the filtrate from aerobic zone. Compared with MBR process, the anaerobic zone increased the reduction of fluorescence intensity of Peak A and Peak C and the change of protein-like structure was different in the AAO process.