Biofilters are promising technologies that widely applied in the treatment of urban stormwater. However, the microbial removal capacity performance depends greatly on the design of biofilters. Hence, this laboratory study attempts to investigate the influence of filter media depths (i.e. 150, 250, 350 and 450 mm) and the variation of native plants, that is, Cow Grass (Axonopus compressus) and Pearl Grass (Axonopus compressus, dwarf) in removing stormwater microorganism particularly Faecal Coliform (FC). Findings showed that a minimum media depth of 300 mm was required to achieve >1 log FC removal. The mean removal of FC at 450 mm depth filter exceeded 2 log for both Cow and Pearl grass biofilter columns. Results showed that there was no statistically significant difference in vegetation type on the performance of FC removal, however, Cow grass biofilter column revealed higher FC mean log removal compared to Pearl grass biofilter column.

中文翻译：

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滤料深度和植被对雨水生物滤池去除粪大肠菌群的影响

生物滤池是有前景的技术，已广泛应用于城市雨水的处理。然而，微生物去除能力的性能很大程度上取决于生物过滤器的设计。因此，本实验室研究试图研究滤料深度（即150、250、350和450 mm）和原生植物（即牛草（Axonopus compressus）和珍珠草（Axonopus compressus，矮化）去除雨水微生物，尤其是粪便大肠菌（FC）。研究结果表明，去除> 1 log FC所需的最小介质深度为300 mm。对于母牛和珍珠草生物滤池柱，在450毫米深度滤池处的平均去除率均超过2 log。结果表明，植被类型在FC去除性能上没有统计学上的显着差异，但是，母牛草生物滤池柱显示的FC平均对数去除率高于珍珠草生物滤池柱。