Abstract:A microcosm scale study was established to explore the adsorption, photodegradation and biodegradation of di-n-butyl phthalate (DBP) in suspended particulate matter (SPM) contained waters. The water and SPM samples were collected from the Yulin River, a tributary of the Three Gorges Reservoir. Twelve columns containing the same amount of water were prepared, and were divided into 4 treatments. 1) containing water and 5mg/L DBP, which were used as controls; 2) containing water, 5mg/L DBP, and NaN3; 3) containing water, 5mg/L DBP, and SPM; 4) containing water, 5mg/L DBP, SPM and NaN3. The water volume, SPM and NaN3 concentration was equivalent for the 4treatments. The results showed that the DBP in the water phase can directly absorb photoelectrons or the chromophore (benzene ring, carboxyl group, etc.) in the colored soluble humus (including fulvic acid and humic acid-like, etc.) could absorb electrons to generate active intermediates, which induced the photocatalytic degradation of DBP. In the raw water-NaN3 experimental group, photocatalytic degradation was responsible for 82.86% degradation of DBP in the water after 24 days. The adsorption of DBP by the SPM was insignificant and triggered 0.63% reduction of DBP in the water, this may be due to the competition of adsorption sites between DBP photodegradation products, soluble organic matter and DBP. The joint effect of adsorption and biofilm degradation by the SPM attached biofilm effectively degraded 89.81% DBP in the water. Although the overall removal efficiency of DBP in the four treatments displayed slight difference (in the range of 82%~89%), the concentration of dissolved organic carbon in the SPM added group but without the addition of NaN3was significantly higher (P<0.05) than others, indicating the degradation of DBP from the water.
黄维, 冉艳, 何艺欣, 刘孟子, 何强, 胡学斌, 李宏. 悬移质泥沙影响下水体中DBP的降解[J]. 中国环境科学, 2022, 42(3): 1230-1239.
HUANG Wei, RAN Yan, HE Yi-xin, LIU Meng-zi, HE Qiang, HU Xue-bin, LI Hong. The degradation of di-n-butyl phthalate in suspended particulate matter contained waters. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(3): 1230-1239.
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