MPR处理低温污水中溶解性有机物的光谱特性

Spectral Characteristics of Dissolved Organic Matter in Low Temperature Sewage Treated by Micro-pressure Inner-loop Bioreactor

该文研究了微压内循环生物处理反应器(MPR)处理低温污水的效果,利用三维荧光光谱-平行因子分析法和紫外光谱法分析了低温下溶解性有机物(DOM)的降解特性及组成变化。结果表明:MPR对低温污水有很好的处理效果,化学需氧量、氨氮、总氮和总磷的平均去除率分别为90%、92%、71%和97%。三维荧光光谱图显示原水中有2个强烈的荧光峰,分别是类酪氨酸峰Peak B和类色氨酸峰Peak T_(1)、Peak T_(2);在MPR处理过程中,出现类腐殖质峰Peak A且难以降解,成为出水主要荧光物质。通过平行因子分析法识别出MPR处理低温污水时,DOM中含有2个主要荧光组分,即类蛋白质C1(Ex=225/280 nm,Em=340 nm)和富里酸类腐殖质C2(Ex=235 nm,Em=415 nm)。2种荧光组分的去除效果不同,类蛋白质经MPR处理后降解了85.1%,而类腐殖质组分较为稳定,无明显变化。在MPR运行周期内的紫外光谱试验分析结果显示,MPR对低温污水中溶解性有机物有一定的降解作用,且发现反应器对难降解的芳香性有机化合物也有降解作用,其降解顺序是先降解取代基,再降解芳香环。

The treatment of low temperature sewage by micro-pressure inner-loop bioreactor(MPR) was studied, the degradation characteristics and composition changes of dissolved organic matter(DOM) at low temperature were analyzed by threedimensional fluorescence-parallel factor analysis(EEM-PARAFAC) combined with ultraviolet spectroscopy. The results showed that MPR had a good effect on the treatment of low temperature sewage. The average removal rate of COD, NH4+-N,TN and TP had reached 90%, 92%, 71% and 97%, respectively. Three-dimensional fluorescence spectrogram showed that there were two dominant fluorescence peaks in the raw water which were called tyrosine-like Peak B and tryptophan-like Peak T_(1), T_(2). In the process of MPR, humus-like Peak A appeared, which was difficult to be degraded and became the main fluorescence substance in effluent. Two fluorescent components of DOM in low temperature wastewater treated by MPR were identified by using EEM-PARAFAC model, which were protein-like C1:(Ex=225/280 nm, Em=340 nm)and humic acid-like C2(Ex=235 nm, Em=415 nm). The removal efficiency of the two fluorescent components was different. The protein-like was degraded by 85.1% after MPR treatment, but the humus-like component was stable and had no obvious change. The results of UV spectrum analysis during the run cycle showed that MPR could degrade the dissolved organic matter in low temperature sewage including the refractory aromatic organic matter, and the order of degradation is first substituent, then aromatic ring.