A/O-混凝-BDD组合工艺处理垃圾渗滤液的研究:Ⅱ.有机物去除机理

Treatment of Landfill Leachate Using A/O-Coagulation-BDD: Ⅱ.Removal Mechanism of the Organic Matters

在A/O-混凝-BDD组合工艺系统最优运行条件下,采用紫外扫描、分子荧光、GC-MS、红外光谱等多种方法从不同角度深入分析A/O-混凝-BDD组合工艺的各段工艺进出水有机物组成和结构特性的变化,剖析不同工艺去除有机物的机理。结果表明,A/O工艺对脂肪族有机物支链和类色氨酸容易去除,对类富里酸有较好的去除,而对类腐殖酸较难去除;水力停留时间(HRT)从4.0 d增加至10.7 d时,增强了系统对类色氨酸和类富里酸的去除;回流比从3.0增加至3.5时,增强了系统对类色氨酸的去除,但对类富里酸的去除效果变差。混凝过程主要去除脂肪族和蛋白质类有机物以及类腐殖酸,对类富里酸去除效果较差,出水中仍残留部分芳香性物质。BDD对渗滤液中残留的各种难降解有机物均能够有效降解。

Landfill leachate was treated by A/O-coagulation-BDD combined processes,and the organic mattersduring treatment processes were characterized by UV spectra,fluorescence excitation-emission matrix,GC-MS,and Fourier transform infrared spectra under optimum operating conditions.Aliphatic organic matters,tryptophanlikematters,and some fulvic acid-like organic matters can be easily removed by A/O treatment while humic acidlikeorganic matters can not.The removal efficiencies of ryptophan-like matters and fulvic acid-like organicmatters were better as HRT increasing from4.0d to10.7d.As sludge recirculation ratio increasing from3.0to3.5,the removal efficiency of ryptophan-like matters was better while the removal efficiency of fulvic acid-like organicmatters was worse.Coagulation mainly removed aliphatic organic matters,proteins,and some humic acid-likeorganic matters,but can’t easily remove fulvic acid-like organic matters,and there were still some aroma organicmatter in the effluent.BDD treatment can effectively remove kinds of refractory organic matters.