State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
J Environ Sci (China). 2019 Feb;76:329-338. doi: 10.1016/j.jes.2018.05.025. Epub 2018 Jun 11.
The removal of four dissolved organic matter (DOM) fractions, non-acid hydrophobics, hydrophobic acids, hydrophilics and transphilics, was achieved by coagulation-UV/HO oxidation in post-pharmaceutical wastewater (PhWW). Coagulation with Polyferric chloride (PFC), Polymeric ferric sulfate (PFS) and Polymeric aluminum ferric chloride (PAFC) was studied separately to evaluate the effects of the initial pH and coagulant dosage. The coagulation-UV/HO oxidation method resulted in much higher reduction rates for dissolved organic carbon (DOC) (by 75%) and UV (by 92%) than coagulation or UV/HO oxidation alone. The proportion of non-acid hydrophobics, hydrophobic acids, transphilics and hydrophilics removed by coagulation was 54%, 49%, 27% and 12 %, while the combined treatment removed 92%, 87%, 70% and 39%, respectively. Parallel factor analysis (PARAFAC) of fluorescence measurements revealed that the humic-like fluorescent component C4 showed the highest removal (by 44%) during the coagulation stage. After coagulation-UV/HO treatment, the humic-like fluorescent component C3 had the highest removal (by 72%), whereas xenobiotic organic fluorescent components C1 and C4 remained recalcitrant to decomposition. Significant correlations (R > 0.8) between C1 and the hydrophobic acids and non-acid hydrophobics suggested the possibility of using fluorescence spectroscopy as an effective tool to assess variations in DOM fraction treatment efficacy in coagulation-UV/HO systems. After the combined treatment, toxic inhibition of cellular activity by post PhWW decreased from 88% to 47% and biodegradability increased from 0.1 to 0.52.
采用混凝-UV/H₂O₂氧化工艺去除了医药废水中的 4 种溶解态有机物质（DOM），分别是非酸性疏水物质、疏水性酸、亲水性物质和转相物质。单独使用混凝或 UV/H₂O₂氧化时，混凝-UV/H₂O₂氧化法对溶解态有机碳（DOC）（去除率 75%）和紫外吸光度（UV）（去除率 92%）的去除效果明显优于混凝或 UV/H₂O₂氧化。混凝对非酸性疏水物质、疏水性酸、转相物质和亲水性物质的去除率分别为 54%、49%、27%和 12%，而联合处理的去除率分别为 92%、87%、70%和 39%。荧光测量的平行因子分析（PARAFAC）表明，腐殖质类荧光组分 C4 在混凝阶段的去除率最高（44%）。混凝-UV/H₂O₂处理后，腐殖质类荧光组分 C3 的去除率最高（72%），而外源性有机荧光组分 C1 和 C4 仍然难以分解。C1 与疏水性酸和非酸性疏水物质之间存在显著相关性（R>0.8），这表明荧光光谱法可作为评估混凝-UV/H₂O₂体系中 DOM 组分处理效果变化的有效工具。经联合处理后，医药废水的细胞毒性从 88%降至 47%，可生化性从 0.1 提高至 0.52。
