Characterization and microbial mechanism of pollutant removal from stormwater runoff in the composite filler bioretention system

IF 4.3 4区环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL

Water Reuse Pub Date : 2024-02-29 DOI:10.2166/wrd.2024.145

Kaiwen Guo, Hairuo Wang, Teng Mu, Jiaxuan Chen, Hui Luo, Bao-Jie He

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引用次数: 0

Abstract

Bioretention systems are a low-impact development (LID) measure to effectively control stormwater runoff and reduce pollutant concentrations. In this paper, three groups of bioretention cells with different filling materials (1# bioretention soil media (BSM), 2# BSM + 5% biochar, and 3# BSM +5% biochar +biological filler) were constructed to analyze the pollutant removal characteristics and microbial action under different simulated rainfall conditions. Results showed that the overall pollutant removal capacity of systems 2# and 3# was higher than that of system 1#, with system 3# having the lowest effluent concentrations of 2.71 mg/L for total nitrogen (TN) and 64.3 mg/L for chemical oxygen demand (COD). The load reduction effect for heavy metals of the three systems was ranked as 2# > 1# > 3#, and average load reduction rates were 80.3, 75.1, and 84.8% for Cu, Pb, and Zn in 2#. Microbial community analysis indicated that Proteobacteria and Firmicutes were the absolute dominant bacteria of the three bioretention systems, and the dominant genera included Bacillus, Hyphomicrobium, Micrococcaceae, and Nitrospira. In addition, the total number of denitrifying functional bacteria genera in systems 2# and 3# was increased by 1.39 and 52.1% compared to system 1#.

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复合填料生物滞留系统去除雨水径流中污染物的特征和微生物机理

生物滞留系统是一种低影响开发（LID）措施，可有效控制雨水径流并降低污染物浓度。本文构建了三组不同填充材料的生物滞留池（1#生物滞留土壤介质、2#生物滞留土壤介质+5%生物炭、3#生物滞留土壤介质+5%生物炭+生物填料），分析了不同模拟降雨条件下的污染物去除特性和微生物作用。结果表明，2#和 3#系统对污染物的总体去除能力高于 1#系统，其中 3#系统的出水浓度最低，总氮（TN）为 2.71 mg/L，化学需氧量（COD）为 64.3 mg/L。三个系统的重金属负荷削减效果依次为 2#>1#>3#，2#系统中铜、铅和锌的平均负荷削减率分别为 80.3%、75.1%和 84.8%。微生物群落分析表明，蛋白质细菌和固缩菌是三个生物滞留系统的绝对优势细菌，优势菌属包括芽孢杆菌、嗜水微生物、微球菌科和硝化细菌。此外，与 1#系统相比，2#和 3#系统的反硝化功能菌属总数分别增加了 1.39%和 52.1%。

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来源期刊

Water Reuse Multiple-

CiteScore

6.20

自引率

8.90%

发文量

审稿时长

7 weeks