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| Bioretention cells with epoxy resin modified loess to remove runoff pollutants |
| ZHOU Hang, ZHOU Jia-jia, XIONG Jia-qing, XU Yan-wei |
| Key Lab of Northwest Water Resource, Environment and Ecology, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China |
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Abstract This paper chose epoxy resin modified loess as the primary filler for the biological retention tank. It tested 48 different raw material types with varying parameters to improve the ratio of epoxy resin to loess as the benchmark (greater than 2mm/min). The corresponding epoxy resin content is 5% (b5), 10% (b10), 5% (b5d1), and 10% (b10d1). The adsorption capability of the four enhanced materials for NH4+ -N and phosphate was stronger than that of conventional fillers. After the biological retention tank was filled, b5d1had the best average removal of NH4+ -N and COD, reaching 93.97% and 77.5%, respectively. b5also removed NO3- -N (76.6%), TN (62.4%), and TP (98%) more successfully than the other two. Through microbial investigation, b5was found to contain more organisms including Chloroflexi and Steroidobacter that are engaged in the flora process. The NH4+ -N, NO3- -N, TN, TP, and COD can all be efficiently removed by an enhanced loess packed biological tank. According to studies, loess enhanced with epoxy resin has a wide range of promotional uses, may be utilized as biological tank packing, and effectively filters contaminants in runoff rainfall.
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Received: 03 June 2024
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