AI Article Synopsis
- Bioretention systems are effective at capturing rubber particles and microplastics from stormwater runoff, but the long-term impact on pollutant removal is still uncertain.
- A study showed that adding ethylene-propylene-diene-monomer (EPDM) particles improved nitrogen removal, with reductions in nitrogen levels in effluent during both short and long-duration rainfalls.
- The presence of EPDM particles also enhanced the growth of denitrifying bacteria in the bioretention system, which boosted its capacity to remove nitrates from the water.
Article Abstract
Bioretention systems effectively capture rubber particles and other microplastics in stormwater runoff. However, it is uncertain whether long-term particle accumulation affects pollutant removal efficacy. This study investigated the impact of various concentrations of ethylene-propylene-diene-monomer (EPDM) particles (0, 50, 100, and 400 mg/L) on bioretention system nitrogen removal performance. The input of EPDM during short-duration (2 h) rainfall favored the removal of nitrogen, and the total nitrogen effluent concentration of the bioretention system with EPDM was reduced by 0.59-1.52 mg/L compared with that of the system without EPDM. In addition, the input of EPDM reduced the negative effects of drought. During long-duration (24 h) rainfall, higher concentrations of EPDM led to lower nitrate-nitrogen concentrations in the effluent. The bioretention system with EPDM required less time for nitrate-nitrogen removal to reach 50% than that without EPDM input. Microbial community analysis showed that EPDM increased the relative total abundance of denitrifying bacteria (such as , , , and ) by 7.25-10.26%, which improved the denitrification capacity of the system.
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| http://dx.doi.org/10.2166/wst.2024.363 | DOI Listing |
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