采用 UV、H2O2 和 UV/H2O2 氧化工艺从废活性污泥中去除酚类内分泌干扰物：反应条件和污泥基质的影响。
Removal of phenolic endocrine disrupting compounds from waste activated sludge using UV, H2O2, and UV/H2O2 oxidation processes: effects of reaction conditions and sludge matrix.
机构信息
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
出版信息
Sci Total Environ. 2014 Sep 15;493:307-23. doi: 10.1016/j.scitotenv.2014.05.149. Epub 2014 Jun 19.
Removal of six phenolic endocrine disrupting compounds (EDCs) (estrone, 17β-estradiol, 17α-ethinylestradiol, estriol, bisphenol A, and 4-nonylphenols) from waste activated sludge (WAS) was investigated using ultraviolet light (UV), hydrogen peroxide (H2O2), and the combined UV/H2O2 processes. Effects of initial EDC concentration, H2O2 dosage, and pH value were investigated. Particularly, the effects of 11 metal ions and humic acid (HA) contained in a sludge matrix on EDC degradation were evaluated. A pseudo-first-order kinetic model was used to describe the EDC degradation during UV, H2O2, and UV/H2O2 treatments of WAS. The results showed that the degradation of the 6 EDCs during all the three oxidation processes fitted well with pseudo-first-order kinetics. Compared with the sole UV irradiation or H2O2 oxidation process, UV/H2O2 treatment was much more effective for both EDC degradation and WAS solubilization. Under their optimal conditions, the EDC degradation rate constants during UV/H2O2 oxidation were 45-197 times greater than those during UV irradiation and 11-53 times greater than those during H2O2 oxidation. High dosage of H2O2 and low pH were favorable for the degradation of EDCs. Under the conditions of pH = 3, UV wavelength = 253.7 nm, UV fluence rate = 0.069 mW cm(-2), and H2O2 dosage = 0.5 mol L(-1), the removal efficiencies of E1, E2, EE2, E3, BPA, and NP in 2 min were 97%, 92%, 95%, 94%, 89%, and 67%, respectively. The hydroxyl radical (OH) was proved to take the most important role for the removal of EDCs. Metal ions in sludge could facilitate the removal of EDCs during UV/H2O2 oxidation. Fe, Ag, and Cu ions had more obvious effects compared with other metal ions. The overall role of HA was dependent on the balance between its competition as organics and its catalysis/photosensitization effects. These indicate that the sludge matrix plays an important role in the degradation of EDCs.
采用紫外光（UV）、过氧化氢（H2O2）和 UV/H2O2 联合工艺，研究了从废活性污泥（WAS）中去除六种酚类内分泌干扰化合物（EDCs）（雌酮、17β-雌二醇、17α-乙炔基雌二醇、雌三醇、双酚 A 和 4-壬基酚）。考察了初始 EDC 浓度、H2O2 用量和 pH 值的影响。特别评估了污泥基质中 11 种金属离子和腐殖酸（HA）对 EDC 降解的影响。采用拟一级动力学模型描述了 WAS 在 UV、H2O2 和 UV/H2O2 处理过程中 EDC 的降解。结果表明，在所有三种氧化过程中，六种 EDC 的降解均符合拟一级动力学。与单独的 UV 辐照或 H2O2 氧化过程相比，UV/H2O2 处理对 EDC 降解和 WAS 溶解更为有效。在最佳条件下，UV/H2O2 氧化过程中 EDC 的降解速率常数是 UV 辐照的 45-197 倍，是 H2O2 氧化的 11-53 倍。高剂量的 H2O2 和低 pH 值有利于 EDC 的降解。在 pH=3、UV 波长=253.7nm、UV 光强率=0.069mWcm(-2)和 H2O2 用量=0.5molL(-1)的条件下，2min 内 E1、E2、EE2、E3、BPA 和 NP 的去除效率分别为 97%、92%、95%、94%、89%和 67%。羟基自由基（OH）被证明是去除 EDCs 的最重要的因素。污泥中的金属离子可以促进 UV/H2O2 氧化过程中 EDCs 的去除。与其他金属离子相比，Fe、Ag 和 Cu 离子具有更明显的效果。HA 的总体作用取决于其作为有机物的竞争与其催化/光敏化作用之间的平衡。这些表明污泥基质在 EDCs 的降解中起着重要作用。
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