石化废水处理过程中荧光有机物变化特征及去除效果

Variation Characteristics and Removal Rate of Fluorescence Organic Matter in the Petrochemical Wastewater Treatment Process

石化废水排放量大、污染物成分复杂,对环境的危害较大。采用三维荧光光谱扫描技术分析了某大型石化企业综合污水处理厂各处理单元(水解酸化+A/O+接触氧化工艺)进出水的荧光光谱特征。污水厂总进水包含四个荧光峰Peak A,Peak B,Peak D,Peak E,分别位于λex/λem=220/300,225/340,270/300,275/340nm附近,荧光物质主要来自工业废水,水解酸化池出水各荧光峰强度有所降低,位置基本不变,厌氧池出水λex/λem=250/425nm附近出现新荧光峰Peak C,好氧池出水荧光峰Peak C处荧光强度有所增强,二沉池出水Peak A消失,二沉池之后水样荧光谱图变化不大;该处理工艺对荧光有机物的总去除率为92.0%,Peak A,Peak B,Peak D,Peak E附近的荧光有机物去除率分别为100.0%,91.2%,80.3%,92.0%;污水厂进水IPeak B/IPeak E值波动较大而出水变化不大,表明该污水处理厂运行稳定,其处理工艺具有较强的抗冲击负荷能力。

Petrochemical wastewater is of huge quantity released during the production and complicated contaminants of petro-chemical wastewater will have immense negative impact on ecology environment. Three-dimensional excitation-emission matrix fluorescence（3D-EEM ） was used to investigate the characteristic fluorescence of influent and effluent from each processing unit of Hydrolysis-acidification ＋A/O＋ Contact-oxidation Process in a typical petrochemical wastewater treatment plant . The re-sults showed that there were 4 fluorescence peaks named Peak A ,Peak B ,Peak D ,Peak E in the spectrum chart of influent ,＆amp;nbsp;they are aroundλex/λem =220/300 ,225/340 ,270/300 ,275/340 nm ,the primary source of fluorescence organic matter （FOM ） is industrial wastewater. The fluorescence intensity of each fluorescence peak was decreased ,while location was unchanged in the effluent of Hydrolysis-acidification. Peak C appeared from the effluent of anaerobic tank at λex/λem =250/425 nm ,then the fluo-rescence intensity of Peak C was enhanced in the effluent of aerobic tank. Peak A disappeared from the effluent of secondary sed-imentation tank. The spectrum chart of the wastewater had no obvious variation after secondary sedimentation tank. The remov-al rate of FOM was expressed with the degradation percentage of the fluorescence intensity ,the total FOM was reduced by 92.0% after processing ,and the removal rate of the FOM fluoresce around Peak A ,Peak B ,Peak D ,Peak E were 100.0% , 91.2% ,80.3% ,92.0% respectively. A volatile IPeak B/IPeak E value of influent but a relatively stable value of effluent demonstra-ted that the wastewater treatment plant operated steadily and the process has higher capacity in resistance to shock loading.