过碳酸钠去除废活性污泥中内分泌干扰物的性能及促进污泥溶胞作用。
Performance of calcium peroxide for removal of endocrine-disrupting compounds in waste activated sludge and promotion of sludge solubilization.
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
Water Res. 2015 Mar 15;71:125-39. doi: 10.1016/j.watres.2015.01.005. Epub 2015 Jan 12.
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 calcium peroxide (CaO2) oxidation. Effects of initial pH and CaO2 dosage were investigated. The impacts of CaO2 treatment on sludge solubilization and anaerobic digestion were also evaluated. Specifically, the role of reactive oxygen species (ROS) in EDC degradation during CaO2 oxidation was tested. Effects of 6 metal ions contained in the sludge matrix on EDC degradation were also evaluated. The results showed that CaO2 treatment can be a promising technology for EDC removal and facilitating sludge reuse. The EDC removal efficiencies increased with the increase in CaO2 dosage. At CaO2 doses of more than 0.34 g per gram of total solid (g g(-1) TS), more than 50% of EDCs were removed in a wide pH range of 2-12. Higher removal efficiencies were achieved at initial pH values of 12 and 2. The products of EDCs during CaO2 oxidation had less estrogenic activity than the originals. Under the conditions of neutral pH and CaO2 dosage = 0.34 g g(-1) TS, the sludge solubilization can be improved by increasing the soluble total organic carbon (STOC) and volatile suspended solids (VSS) reduction by 25% and 27% in 7 d, respectively; the volatile fatty acid (VFA) production was enhanced by 96% in the 15 d following anaerobic digestion. The ROS released by CaO2 are the main factors contributing to EDC removal, among which, hydroxyl radicals (OH) play the most important role. Metal ions contained in the sludge matrix also affected EDC removal. For most cases, Fe, Cu, and Zn had positive effects; Mn and Ag had negative effects; and Mg had an insignificant effect on EDC removal.
用过氧化钙（CaO2）氧化法去除废活性污泥（WAS）中的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 pH 值和 CaO2 用量的影响。还评估了 CaO2 处理对污泥溶解和厌氧消化的影响。具体来说，测试了 CaO2 氧化过程中活性氧物质（ROS）在 EDC 降解中的作用。还评价了污泥基质中 6 种金属离子对 EDC 降解的影响。结果表明，CaO2 处理是去除 EDC 并促进污泥再利用的一种有前途的技术。EDC 去除效率随 CaO2 用量的增加而增加。在 CaO2 剂量超过每克总固体（g g(-1) TS）0.34 g 时，在 2-12 的宽 pH 范围内，超过 50%的 EDC 被去除。在初始 pH 值为 12 和 2 时，去除效率更高。在 CaO2 氧化过程中，EDC 的产物比原始产物的雌激素活性更低。在中性 pH 和 CaO2 剂量=0.34 g g(-1) TS 的条件下，7 d 内可分别提高可溶性总有机碳（STOC）和挥发性悬浮固体（VSS）的减少率，提高污泥的溶解率，分别提高 25%和 27%；在随后的厌氧消化 15 d 内，挥发性脂肪酸（VFA）的产量增加了 96%。CaO2 释放的 ROS 是去除 EDC 的主要因素，其中羟基自由基（OH）起着最重要的作用。污泥基质中含有的金属离子也影响 EDC 的去除。在大多数情况下，Fe、Cu 和 Zn 具有积极影响；Mn 和 Ag 具有消极影响；Mg 对 EDC 去除影响不大。
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