徐垒,谢锐莉,董慧峪,袁向娟,李津,强志民.亚硫酸氢根活化高锰酸根氧化富里酸对消毒副产物生成势的影响[J].环境科学学报,2019,39(6):1781-1789
亚硫酸氢根活化高锰酸根氧化富里酸对消毒副产物生成势的影响
- Effect of bisulfite activated permanganate oxidation of fulvic acid on the formation potential of disinfection by-products
- 基金项目：国家自然科学基金（No.51878648）；国家水体污染控制与治理科技重大专项（No.2017ZX07207-004）
- 徐垒
- 1. 青岛大学, 环境科学与工程学院, 青岛 266071;2. 中国科学院生态环境研究中心, 饮用水科学与技术重点实验室, 北京 100085
- 谢锐莉
- 2. 中国科学院生态环境研究中心, 饮用水科学与技术重点实验室, 北京 100085;3. 武汉纺织大学, 环境工程学院, 武汉 430200
- 董慧峪
- 中国科学院生态环境研究中心, 饮用水科学与技术重点实验室, 北京 100085
- 袁向娟
- 武汉纺织大学, 环境工程学院, 武汉 430200
- 李津
- 青岛大学, 环境科学与工程学院, 青岛 266071
- 强志民
- 中国科学院生态环境研究中心, 饮用水科学与技术重点实验室, 北京 100085
- 摘要：考察了高锰酸钾/亚硫酸氢钠（PM/BS）氧化体系对天然有机物（NOM）组分富里酸（FA）的结构变化及消毒副产物（DBPs）生成势的影响.通过紫外-可见光谱、总有机碳（TOC）、三维荧光光谱对FA结构变化进行了表征.结果发现，经PM/BS预氧化之后，PM的光谱特征峰及FA的荧光强度峰均消失.三氯甲烷（TCM）及二氯乙腈（DCAN）分别是FA生成的主要的含碳及含氮类DBPs.在PM单独氧化中，TCM与DCAN的浓度随PM投加量的增大都呈现先略微上升后下降的趋势；而在PM/BS体系中，随着PM/BS投加量的增大，TCM的浓度呈现先降低后升高的趋势，而DCAN的浓度则显著上升.反应pH也显著影响FA的DBPs生成势，在PM体系中，除TCM和DCAN外其他DBPs（1，1-二氯丙酮（1，1-DCP）、1，1，1-三氯丙酮（1，1，1-TCP）、三氯乙腈（TCAN）、三氯硝基甲烷（TCNM））浓度总体随pH的增大而下降.在PM/BS体系中，随着pH的升高，C-DBPs及N-DBPs总浓度总体呈现先降低后升高再降低的趋势，pH 7.5时达到最大值.在pH 7.5时，无预氧化的条件下生成的TCM浓度约为100.7 μg·L-1，DCAN浓度约为7.5 μg·L-1；在PM预氧化条件下二者浓度分别为127.5 μg·L-1和9.7 μg·L-1；而在PM/BS预氧化条件下生成的TCM高达217.1 μg·L-1，DCAN为9.3 μg·L-1.PM/BS氧化工艺在加速降解微量有机物的同时，亦将改变NOM结构，进而有可能提升NOM的DBPs生成势，在实际工程应用中应予以关注.
- Abstract：The potassium permanganate/sodium bisulfite (PM/BS) oxidation of fulvic acid (FA), which is a component of natural organic matter (NOM), and its effect on the disinfection by-products (DBPs) formation potential were investigated. The structural changes of FA was characterized by UV-vis spectroscopy, total organic carbon (TOC) and three-dimensional excitation emission matrix spectra. The results show that after PM/BS pre-oxidation, the spectral characteristic peaks of PM and the fluorescence intensity peaks of FA disappeared. Trichloromethane (TCM) and dichloroacetonitrile (DCAN) were the main carbonaceous and nitrogenous DBPs of FA, respectively. In the PM oxidation alone, with the increase of PM dosage, the TCM and DCAN concentrations increased slightly and then decreased. In the PM/BS system, with the increase of PM/BS dosage, TCM concentration decreased first and then increased, while DCAN increased significantly. The reaction pH also significantly influenced the DBPs formation potential of FA. In the PM system, the concentration of other DBPs except TCM and DCAN (1,1-dichloroacetone (1,1-DCP), 1,1,1-trichloroacetone (1,1,1-TCP), trichloroacetonitrile (TCAN), trichloronitromethane (TCNM)) generally decreases with increasing pH. In the PM/BS system, with the increase of pH, the total concentration of C-DBPs and N-DBPs generally showed a trend of decreasing first, then increasing and then decreasing, reaching a maximum at pH 7.5. At pH 7.5, the concentrations of TCM and DCAN formed under no pre-oxidation condition were approximately 100.7 μg·L-1 and 7.5 μg·L-1, respectively; under PM pre-oxidation condition, the concentrations were approximately 127.5 μg·L-1 and 9.7 μg·L-1, respectively; while the concentration of TCM generated under PM/BS pre-oxidation condition was as high as 217.1 μg·L-1, and the concentration of DCAN was 9.3 μg·L-1. Although PM/BS could accelerate the degradation of micro-pollutants, the enhanced formation of DBPs, should draw enough attention during the practical application.
