Abstract
Abstract This study investigated the physical and chemical properties of a single or combination of permeable materials which can be used as fillers in the Sponge City program in China. Four types of fillers, perlite, coral sand, vermiculite and ceramsite, were selected from six alternative fillers by an analytic hierarchy process. The optimal city sponge, which consists of vermiculite (10 cm), ceramsite (15 cm), perlite (15 cm), coral sand (20 cm) and Canna indica L, was found by the orthogonal experiment (L16(45)). The results of the simulated rainwater experiment of the optimal sponge showed that the permeability coefficient K10, NH3-N, total phosphorus (TP) and chemical oxygen demand (COD) removal rate were 1.20 ± 0.23 mm/s, 96.6 ± 0.2%, 36.8 ± 0.07% and 9.6 ± 0.07% respectively. The results suggested that the optimal sponge had an excellent treatment effect on NH3-N in rainwater while ensuring rapid infiltration. It provided a simple, economical and effective method for rainwater treatment and the Sponge City program in the future.
Highlights
IntroductionYunpeng Jing Jian Li (corresponding author) Yimin Mei Xiao Liu Xuelan Yu Xuezhou Hu Fangfang Song Key Laboratory of Jiangxi Province for Persistant
Yunpeng Jing Jian Li Yimin Mei Xiao Liu Xuelan Yu Xuezhou Hu Fangfang Song Key Laboratory of Jiangxi Province for PersistantMingming Lu Department of Chemical and EnvironmentalEngineering, University of Cincinnati, Cincinnati, Ohio, USAIn recent decades in China, about ten million people have entered cities (Qiu ) every year
In China, the economic loss and casualties in cities affected by flooding have increased significantly (Liao et al )
Summary
Yunpeng Jing Jian Li (corresponding author) Yimin Mei Xiao Liu Xuelan Yu Xuezhou Hu Fangfang Song Key Laboratory of Jiangxi Province for Persistant. In recent decades in China, about ten million people have entered cities (Qiu ) every year. As a result of urbanization, a large number of buildings were built, resulting in decreased green areas and an increase of impervious zones, which increased the risks of urban flooding. In China, the economic loss and casualties in cities affected by flooding have increased significantly (Liao et al ). In 2011, the worst urban waterlogging occurred in China, which caused nearly 400 billion yuan of economic losses (Wu et al ). In 2016, 28 provinces in China experienced severe flooding during weeks of torrential rainfall (Jiang et al ). Urban rain water management has become a serious challenge
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