Abstract
Mixed media design is key factor that affects the operation of bioretention systems. In this study, four types of modifiers, namely, water treatment residual (WTR), green zeolite, fly ash, and coconut bran, were mixed with traditional bioretention soil (65% sand + 30% soil + 5% sawdust, by mass). Consequently, four kinds of modified media were obtained. Ten pilot-scale bioretention basins were constructed by setting different configurations. The steady infiltration rates of the modified packing bioretention systems were 3.25~62.78 times that of plant soil, which was 2.88~55.75 m/day. Results showed that the average concentration removal (ACR) of both mixed and layered fly ash and WTR were better than those of the other media, and the effects could reach over 61.92%. In the bioretention basins with WTR as the modifier, the treatment efficiency of nitrogen under the submerged zone height of 150 mm was relatively optimal, and ACR could reach 65.46%. Outflow total nitrogen (TN) load was most influenced by inflow load, and the correlation coefficient was above 0.765. Relative to the change of inflow concentration (IC), the change of recurrence interval (RI) and discharge ratio (DR) was more sensitive to TN load reduction. The reduction rate of TN load decreased by approximately 15% when the recurrence interval increased from 0.5 to 3 years. It decreased by approximately 12% when the discharge ratio increased from 10 to 20. This study will provide additional insights into the treatment performance of retrofit bioretention systems, and thus, can guide media and configuration design, effect evaluation, and related processes.
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Funding
This research was financially supported by the National Natural Science Foundation of China (51879215), the key research and development project of Shaanxi Province (2017ZDXM-SF-073), and the open foundation of Institute of Water Resources and Hydro-Electric Engineering of Xi’an University of Technology (2016ZZKTZ-30).
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Jiang, Cb., Li, Jk., Zhang, Bh. et al. Design parameters and treatment efficiency of a retrofit bioretention system on runoff nitrogen removal. Environ Sci Pollut Res 25, 33298–33308 (2018). https://doi.org/10.1007/s11356-018-3267-5
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DOI: https://doi.org/10.1007/s11356-018-3267-5