Gou Xiying, Zhang Panyue, Song Yonghui, Qian Feng, Yu Huibing, Zeng Guangming
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China; Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China and State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China E-mail:
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
Water Sci Technol. 2017 Dec;76(11-12):3246-3257. doi: 10.2166/wst.2017.425.
In this study, coagulation process was applied to treat the effluent of pharmaceutical wastewater using polymeric ferric sulfate as a coagulant. Three-dimensional excitation-emission matrix fluorescence spectroscopy coupled with parallel factor analysis (EEMs-PARAFAC) was applied to investigate the fluorescent characteristics of dissolved organic matter (DOM) from pharmaceutical wastewater and the reduction of contaminant and fluorescent variations in the coagulation process. It shows that coagulation was effective to remove contaminants in the effluent of pharmaceutical wastewater, and the optimum coagulate dosage was 0.5 g/L, where the removal efficiency of total organic matter (TOC), UV, turbidity and NH-N were achieved 44.2%, 43.3%, 87.0% and 10.27%, respectively. Five fluorescence components were identified by EEMs-PARAFAC, including one fulvic-like component (C1), one xenobiotic-like component (C2), two humic-like components (C3 and C5) and one protein-like component (C4); DOM of pharmaceutical wastewater was dominated by C3, C4 and C2. Under the optimum coagulation condition, the decreasing order of removal efficiencies was C5 (49.92%), C3 (40.95%), C4 (10.58%), C2 (9.68%) and C1 (5.05%). Principal component analysis (PCA) showed C3, C5 had remarkable correlations with TOC and UV, suggesting that C3 and C5 may be a good indicator for the reduction of TOC and UV. PCA indicated that the EEM-PARAFAC could be successfully applied to the evaluation of the coagulation efficiency for pharmaceutical wastewater treatment.
在本研究中，采用聚合硫酸铁作为混凝剂，应用混凝工艺处理制药废水的出水。采用三维激发-发射矩阵荧光光谱结合平行因子分析（EEMs-PARAFAC）研究制药废水中溶解性有机物（DOM）的荧光特性以及混凝过程中污染物的去除和荧光变化。结果表明，混凝对制药废水出水中的污染物有有效去除作用，最佳混凝剂投加量为0.5 g/L，此时总有机碳（TOC）、紫外吸光度、浊度和氨氮的去除率分别达到44.2%、43.3%、87.0%和10.27%。通过EEMs-PARAFAC识别出5种荧光组分，包括1种类富里酸组分（C1）、1种类外源物质组分（C2）、2种类腐殖酸组分（C3和C5）和1种类蛋白质组分（C4）；制药废水的DOM以C3、C4和C2为主。在最佳混凝条件下，去除率的递减顺序为C5（49.92%）、C3（40.95%）、C4（10.58%）、C2（9.68%）和C1（5.05%）。主成分分析（PCA）表明，C3、C5与TOC和紫外吸光度有显著相关性，表明C3和C5可能是TOC和紫外吸光度降低的良好指标。PCA表明，EEM-PARAFAC可成功应用于制药废水处理混凝效率的评价。
