Compositional Characteristics of Interstitial Water Dissolved Organic Matter in Bioretention Systems with Different Filling
FAN Gong-duan1*, LIN Xiu-yong1,2, WANG Shu-min1,2*, LUO Jing1, XIE Zhi-gang2, LI Qiang2
1. College of Civil Engineering, Fuzhou University, Fuzhou 350116, China
2. Chongqing Key Laboratory of Environmental Material and Restoration Technology，Chongqing University of Arts and Sciences, Chongqing 402160，China
Abstract：To find out the impact of different saturation filling in the treatment process of bioretention systems, composition and dynamics of dissolved organic matter in runoff were analyzed using three-dimensional excitation emission matrix fluorescence spectroscopy (EEM). The results indicated that the major organic compounds of interstitial water were microbial metabolites from sponge iron, fulvic-like substances from brick bat and volcanic, and aromatic protein-like substances, fulvic-like substances and biometabolism from chippings. After 48 h treatment, fluorescence peakof interstitial water associated with fulvic-like and brick bat were weakened, but volcanic and chippings were strengthened. The best purification of organic substance was obtained by sponge iron at 84.52%, followed by volcanic and brick bat at 77.25% and 77.90% respectively, and chippings at 29.20%. Thevolume fluorescence integral of fulvic-like substances in effluent of bioretention decreased to 58.04% on average, but aromatic protein-like substances increased on average to 65.36%. HIX of all samples were smaller than 4, which means the organic compounds mainly come from microorganism supersession activity. Aromatic protein-like substances degraded by microbes easily, which could promote microorganism activity and nitrogen removal by denitrification. The design suggests that sponge iron and brick bat would be better as the saturation filling. External carbon source would be able to choose organic compounds which are easily utilized by microbe.
范功端，林修咏，王书敏，罗 劲，谢志刚，李 强. 生物滞留系统间隙水DOM三维荧光光谱特征分析[J]. 光谱学与光谱分析, 2018, 38(04): 1139-1145.
FAN Gong-duan, LIN Xiu-yong, WANG Shu-min, LUO Jing, XIE Zhi-gang, LI Qiang. Compositional Characteristics of Interstitial Water Dissolved Organic Matter in Bioretention Systems with Different Filling. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(04): 1139-1145.
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