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Effect of Anions on Spectral Properties of DOM from Secondary Sewage of Municipal Wastewater |
YANG Yi1, 3, ZHENG Zhen-ze1, MA Xin-pei1, HAN Li-yuan1, HU Min1, XU Hui-ning1, 2 |
1. School of Environmental & Municipal Engineering, Xi’an University of Architecture and Technology,Xi’an 710055, China
2. Shaanxi Key Laboratory of Environmental Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
3. Experimental Teaching Demonstration Center of National Environmental Specialty, Xi’an University of Architecture and Technology, Xi’an 710055, China |
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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 SO2-4 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 SO2-4 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.
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Received: 2017-07-11
Accepted: 2017-11-20
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