Characterization of dissolved organic matter in urban sewage using excitation
emission matrix fluorescence spectroscopy and parallel factor analysis |
| |
Authors: | Weidong Guo Jing Xu Jiangping Wang YingrouWen Jianfu Zhuo and Yuchao Yan |
| |
Institution: | 1. State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China;Joint Key Laboratory of Coastal Study(XMU & FJIO), Xiamen University, Xiamen 361005, China 2. State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China |
| |
Abstract: | Microcystins (MCs) produced by cyanobacteria are strong hepatotoxins and classified as possible carcinogens. MCs pose a
considerable threat to human health through tainted drinking and surface waters. Herein filtrated water from a waterworks in Harbin,
China, was spiked with microcystin-LR (MC-LR) extracted from a toxic scum of microcystis aeruginosa, and the spiked sample waters
were treated using UV irradiation with consequent ozonation process (UV/O3), compared with ozonation at a dose range commonly
applied in water treatment plants, UV irradiation at 254 nm and UV irradiation combined with ozonation (UV+O3), respectively. The
remaining of toxins were analyzed using high-performance liquid chromatography and also determined using a protein phosphatase
type 2A inhibition assay, which was utilized to evaluate the reduction in toxicity. Results indicated that in comparison to other three
processes (O3, UV, and UV+O3), UV/O3 process could e ectively decrease both the concentration and toxicity of MC-LR at 100 g/L
level after 5 min UV irradiation with consequent 5 min ozonation at 0.2 mg/L (below 1 g/L ), while 0.5 mg/L ozone dose was required
for the level below 0.1 g/L. The addition of an UV treatment step to the existing treatment train may induce significant transformation
of micropollutants and breaks down the natural organic matters into moieties unfavorable for ozone decomposition, stabilizing the
ozone residual. These findings suggested that sequential use of UV and ozone may be a suitable method for the removal of these
potentially hazardous microcystins from drinking water. |
| |
Keywords: | dissolved organic matter sewage fluorescence EEM parallel factor analysis |
本文献已被 CNKI 万方数据 ScienceDirect PubMed 等数据库收录! |
| 点击此处可从《环境科学学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《环境科学学报(英文版)》下载免费的PDF全文 |
|