阴离子对城市污水二级出水DOM光谱特性影响

doi:10.3964/j.issn.1000-0593(2018)07-2157-06

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摘要：利用三维荧光光谱法和紫外光谱法，研究阴离子对城市污水二级出水DOM光谱的影响，为环境中DOM分析提供数据基础。结果表明：投加SO^2-₄和Cl^-使二级出水DOM荧光峰强度小幅度增强或降低。投加NO^-₃浓度在0.005～0.1 mol·L^-1时，出现代表可见光区类腐殖质的荧光峰。随投加NO^-₃浓度增大，荧光强度显著降低；代表类腐殖质荧光峰的激发波长和发射波长与紫外吸收峰右侧红移。NO^-₃投加浓度与HIX，UV₂₅₄，UV₂₅₃/UV₂₀₃，α₃₀₀和α₂₅₀/α₃₆₅呈较强的正相关性，决定系数分别为0.993，0.994，0.987，0.998和0.995；与BIX呈负相关性，R²为0.949；对α₃₅₀和α₃₅₅影响不大。结果表明，投加SO^2-₄和Cl^-对二级出水DOM的荧光(除荧光强度外)和紫外特性影响较小。样品NO^-₃浓度不同时，用荧光参数和紫外参数衡量不同DOM来源和性质时将产生一定影响。

关键词：阴离子；二级出水；DOM；光谱特性

Abstract：This study investigated how the anions had the effect on the spectral characteristics of dissolved organic matter (DOM) of secondary effluent from municipal wastewater treatment by using three-dimensional fluorescence spectroscopy and UV spectrophotometry in order to provide the data foundation for DOM’s environmental behavior. The results showed that the addition of SO^2-₄ and Cl^- could increase or decrease the fluorescence intensity of DOM’s fluorescence peaks. In addition, the fluorescence peak representing the visible humus-like was observed with the additional concentration of NO^-₃ with 0.005~0.1 mol·L^-1. Moreover, the fluorescence intensity of each fluorescence peak decreased obviously with the increase of NO^-₃ concentration, and the excitation and emission wavelengths of the fluorescence peaks representing the humus-like were red shifted with the right side of UV absorption peak. The added NO^-₃ concentration was positively correlated with HIX with the determination coefficient of 0.993. This was similar to that with UV₂₅₄(0.994), UV₂₅₃/UV₂₀₃(0.987), α₃₀₀(0.998) and α₂₅₀/α₃₆₅(0.995). And it had the negative correlation with BIX as the determination coefficients was 0.949. However, it had no significant effect on α₃₅₀ and α₃₅₅. In conclusion, the addition of SO^2-₄ and Cl^- had little effect on the fluorescence and UV characteristics of secondary effluent DOM except fluorescence intensity. When the concentrations of NO^-₃ in the samples were different, it had a certain effect on analyzing the source and the properties of the different DOMs by using fluorescenct parameters and UV parameters.

Key words：Anion; Secondary effluent; DOM; Spectral properties

收稿日期: 2017-07-11 修订日期: 2017-11-20

中图分类号:

X132

基金资助: 国家自然科学基金项目(21407119)，陕西省教育厅专项科研计划项目(15JK1440)资助

作者简介: 杨毅，女，1976年生，西安建筑科技大学环境与市政工程学院副教授 e-mail: yangyi@xauat.edu.cn

引用本文:

杨毅，郑振泽，马新培，韩丽媛，胡敏，徐会宁. 阴离子对城市污水二级出水DOM光谱特性影响[J]. 光谱学与光谱分析, 2018, 38(07): 2157-2162.
YANG Yi, ZHENG Zhen-ze, MA Xin-pei, HAN Li-yuan, HU Min, XU Hui-ning. Effect of Anions on Spectral Properties of DOM from Secondary Sewage of Municipal Wastewater. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(07): 2157-2162.

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