Variation of dissolved organic matter and its biotoxicity from secondary effluent under sunlight and ultraviolet light irradiation
ZHANG Shi-ying1, MA Xiao-yan1, DONG Ke1, HAO Li-wei2, ZHANG Wei-yao3, Li Ying1, WANG Xiao-chang1, ZHOU Jin-hong4
1. Key Laboratory of Northwest Water Resources and Environment, Shaanxi Key Laboratory of Environmental Engineering, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China; 2. Shandong Urban Construction Design Institute, Jinan 250000, China; 3. Xi'an No.5 Wastewater Treatment Plant, Xi'an 710021, China; 4. School of Geography and Environment, Baoji University of Arts and Sciences, Baoji 721013, China
Abstract：In order to investigate the variation of dissolved organic matter (DOM) and related biotoxicity from secondary effluent, this paper studied the spectral characteristics, genotoxicity and phytotoxicity of DOM from secondary effluent under the photolysis condition of sunlight and ultraviolet light (UV) irradiation. The origin of biotoxicity from DOM was also explored. The results showed that UV irradiation could significantly decrease UV254 value and achieve 21% of mineralization, comparing with sunlight irradiation. Both sunlight and UV irradiation could reduce the chromophoric dissolved organic matter (CDOM), but the obviously removed components were different. Meanwhile, the sunlight and UV irradiation could also reduce genotoxicity posed by secondary effluent and their removal efficiencies were 92% and 61%, respectively. Genotoxicity from secondary effluent was significantly correlated with fluorescence intensity of CDOM. UV irradiation could reduce 81% of phytotoxicity posed by secondary effluent. However, sunlight irradiation showed a poor property on phytotocicity removal (only 19%). UPLC-MS was used to detect herbicides from secondary effluent. It was found that the difference in phytotocicity removal was mainly due to the slow degradation of atrazine in secondary effluent under sunlight irradiation, and its apparent rate constant was 0.0033h-1. However, atrazine could be rapidly degraded under UV irradiation, whose apparent degradation rate constant was 0.2225h-1. This provides a certain basis for the biotoxicity control and ecological safety of discharged wastewater from wastewater treatment plant.
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