Wang Miaomiao, Meng Yingjie, Ma Defang, Wang Yan, Li Fengli, Xu Xing, Xia Chufan, Gao Baoyu
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, People's Republic of China.
Shandong Institute of Metrology, Jinan, 250014, China.
Environ Sci Pollut Res Int. 2017 May;24(13):12426-12436. doi: 10.1007/s11356-017-8854-3. Epub 2017 Mar 30.
This study investigated the N-nitrosodimethylamine (NDMA) formation potential of various dissolved organic matter (DOM) fractions in biologically treated municipal wastewater by UF fractionation, XAD-8 resin adsorption isolation, and excitation and emission matrix (EEM) fluorescence spectroscopy. Removal of various NDMA precursor fractions was also analyzed to evaluate the efficiency of traditional water treatment processes (coagulation, adsorption, and coagulation-adsorption). Results showed that NDMA were mainly formed by low molecular weight (MW) fractions (<30 kDa) and hydrophilic fractions (HiS) in biologically treated municipal wastewater. Integrated coagulation-adsorption treatments showed the highest reduction capacity for NDMA formation potential (57%), followed by isolated adsorption treatment (50%) and isolated coagulation treatment (28%). The powdered activated carbon (PAC) adsorption process could reduce the high MW precursors (>30 kDa) by 48%, which was higher than other treatments. In contrast, the highest uptake (66%) of low MW precursors (<30 kDa) was achieved by the coagulation-adsorption process. All treatments preferentially removed the hydrophobic acids (HoA) fraction compared to other fractions. Coagulation could remove more fulvic acid-like substances and adsorption could remove more microbial by-products and aromatic proteins.
本研究通过超滤分级、XAD - 8树脂吸附分离以及激发发射矩阵（EEM）荧光光谱法，研究了生物处理后的城市污水中各种溶解有机物（DOM）组分形成N - 亚硝基二甲胺（NDMA）的潜力。还分析了各种NDMA前体组分的去除情况，以评估传统水处理工艺（混凝、吸附以及混凝 - 吸附）的效率。结果表明，在生物处理后的城市污水中，NDMA主要由低分子量（MW）组分（<30 kDa）和亲水组分（HiS）形成。综合混凝 - 吸附处理对NDMA形成潜力的降低能力最高（57%），其次是单独吸附处理（50%）和单独混凝处理（28%）。粉末活性炭（PAC）吸附工艺可使高分子量前体（>30 kDa）减少48%，高于其他处理方法。相比之下，混凝 - 吸附工艺对低分子量前体（<30 kDa）的去除率最高（66%）。与其他组分相比，所有处理方法都优先去除疏水酸（HoA）组分。混凝可以去除更多类富里酸物质，吸附可以去除更多微生物副产物和芳香族蛋白质。
