冬季不同污水处理工艺对溶解性有机物的去除

以东北地区4个城市污水处理厂为研究对象,考察冬季不同污水处理工艺对溶解性有机物(DOM)组分的去除效果,以及对DOM组分的光谱学特性和卤代活性的影响.利用XAD树脂将DOM分为5个部分:疏水性有机酸(HPO-A)、疏水性中性有机物(HPO-N)、过渡亲水性有机酸(TPI-A)、过渡亲水性中性有机物(TPI-N)和亲水性有机物(HPI).结果表明,A/O法、曝气生物滤池、浮动填料法和A2/O法对DOM都具有较高的去除能力,其中曝气生物滤池对DOM的处理效果最好.经4种污水处理工艺处理后,5种组分的芳香性和三卤甲烷生成活性(STHMFP)均升高.A2/O法对HPO-A和TPI-A的芳香性增强程度最高,而曝气生物滤池对HPO-N,TPI-N和HPI的芳香性增强程度最高.浮动填料法对HPO-A,TPI-A和HPI的STHMFP升高最显著,A2/O法对HPO-N的STHMFP增加最显著,曝气生物滤池对TPI-N的STHMFP升高最显著.4种污水处理工艺对HPI中荧光物质的去除率高于非荧光物质.而对于其他4种DOM组分来说,不同的污水处理工艺对不同荧光峰的改变不相同.

Removals of dissolved organic matter fractions by different wastewater treatment processes in winter

The removals of dissolved organic matter (DOM) fractions as well as changes in the spectroscopic characteristics of DOM fractions in four municipal sewage treatment plants in the Northeast in winter were investigated. DOM was fractionated using XAD resins into five fractions: hydrophobic acid (HPO-A), hydrophobic neutral (HPO-N), transphilic acid (TPI-A), transphilic neutral (TPI-N) and hydrophilic fraction (HPI). Removals of DOM by anaerobic-anoxic-oxic (A2/O)、biological aerated filter (BAF)、suspended carrier activated sewage (SCAS) and A2/O processes were high, and the BAF process was the most efficient process for reduction of DOM. Both aromaticity and specific trihalomethaneformation potential (STHMFP) increased as a result of the four wastewater treatment processes. The increases in aromaticity of HPO-A and TPI-A caused by the A2/O process were the greatest, while those of HPO-N、TPI-N and HPI caused by the BAF process were the greatest. The increases in STHMFP of HPO-A, TPI-A and HPI caused by the SCAS process were the greatest, while those of HPO-N and TPI-N caused by the A2/O and BAF processes were the greatest, respectively. The removal efficiency of fluorescent materials in HPI was higher than that of non-fluorescent materials by the four wastewater treatment processes. On the other hand, the changes in different fluorescence peaks of the other four DOM fractions caused by different wastewater treatment processes were distinct and different.