pH值对AOA-SBR处理污水过程中COD三维荧光法表征的影响

doi:10.11934/j.issn.1673-4831.2017.12.012

摘要/Abstract

摘要：

为探究在AOA-SBR工艺处理城市污水过程中不同pH值对COD快速表征的影响，利用三维荧光光谱技术研究溶解性有机物（DOM）的荧光强度与COD浓度的相关性，并进一步研究不同pH值对其相关性的影响。根据三维荧光光谱及相关性分析得知，污水处理过程中DOM主要有低激发波长色氨酸、高激发波长色氨酸和类腐殖酸3种物质，且2种色氨酸及两者之和的荧光强度与COD有很强的正相关关系，R²分别为0.982 3、0.977 4和0.980 9。当pH值为4时，低激发波长色氨酸、高激发波长色氨酸及色氨酸荧光强度之和与COD的R²为0.871 1、0.856 7和0.873 3；当6 ≤ pH值≤ 8时，相关性呈平稳变化趋势，R²波动范围分别为0.926 2~0.983 4、0.969 3~0.982 7和0.952 1~0.988 8；当pH值>8时，相关性随pH值增大呈下降趋势，R²波动范围分别为0.845 7~0.749 0、0.900 8~0.869 9和0.889 5~0.837 6。认为当pH值为6~8时DOM与COD的相关性较好。

关键词: 三维荧光光谱, 溶解性有机物, pH值, 荧光强度, COD

Abstract:

To explore effect of pH on rapid characterization of COD in the treatment of urban sewage using AOA-SBR technology, the three-dimensional fluorescent spectrum method was used to investigate relations between COD and fluorescence intensity of DOM, and further effect of pH on this relationship. Analyses of the three-dimensional fluorescence spectra obtained and their relationships with COD show that the DOM in the sewage under treatment contained the following three substances:tryptophan low in excitation wavelength, tryptophan high in excitation wavelength and humic acid. The two types of tryptophan and their sum in fluorescent intensity was highly and positively related to COD with R² being 0.982 3, 0.977 4 and 0.980 9, respectively, turning to be 0.871 1, 0.856 7 and 0.873 3 respectively, when pH was at 4, varying in the range of 0.926 2-0.983 4, 0.969 3-0.982 7 and 0.952 1-0.988 8 respectively, when pH varied between 6 and 8, and fluctuating in the range of 0.845 7-0.749 0, 0.900 8-0.869 9 and 0.889 5-0.837 6, respectively, along a declining trend with pH rising on above 8. Then it could be concluded that when pH was 6-8, DOM and COD concentrations are closely related in fluorescence intensity.

Key words: three-dimensional fluorescence spectrum, dissolved organic matter, pH, fluorescence intensity, COD

中图分类号:

X703.1

黄健, 吴兆亮, 张华, 张勇, 张雄, 于孝坤, 凌玲. pH值对AOA-SBR处理污水过程中COD三维荧光法表征的影响[J]. 生态与农村环境学报, 2017, 33(12): 1146-1152.

HUANG Jian, WU Zhao-liang, ZHANG Hua, ZHANG Yong, ZHANG Xiong, YU Xiao-kun, LING Ling. Effect of pH on Characterization of COD With Three-Dimensional Fluorescence in the Process of AOA-SBR Treating Wastewater[J]. Journal of Ecology and Rural Environment, 2017, 33(12): 1146-1152.

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