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Effects of Amendments on Bioretention Systems: The Field and Laboratory Investigations
In the face of urbanization and climate change, Canadian municipalities have intended to supplement the centralized drainage system with decentralized stormwater management practices, such as bioretention systems, to better management urban stormwater runoff. However, it is not uncommon to observe that bioretention systems leach nutrients (both phosphorus (P) and nitrogen (N)), particularly in the beginning of their operation. This study examined the effects of six amendments selected primarily for reducing P leaching of bioretention systems through monitoring six amendment and two control cells in the field in the growing season of 2020. In addition, two amendments were examined in the laboratory setting to investigate the influence of amendment mixture percentage on their performance using laboratory columns. The field results showed that all amendments had the capability of preventing or mitigating P leaching from bioretention systems, with the water treatment residual (WTR) outperforming all other amendments, followed by the sorptiveMEDIA (SM) and activated aluminum (AA). In addition, some of the amendments (i.e., drywall (DRY), WTR, and SM) were also found to be beneficial in reducing the N leaching to a slight degree, whereas eggshell (EGG) introduced an extra source of N leached. Furthermore, the temporal evolution of the P leaching of the amendment cells was found to be different from that of the control cells, whereas same result was not observed in the N leaching. The laboratory results further confirmed the effectiveness of SM and AA in reducing P leaching. The results also revealed that the increase of the mixture percentage of amendment did not always improve the performance (in term of P removal rate) and reduce the degree of P leaching. The observed difference in the P leaching behavior between the bioretention cells and columns suggests that caution should be paid when translating laboratory knowledge into the field.
Effects of Amendments on Bioretention Systems: The Field and Laboratory Investigations
In the face of urbanization and climate change, Canadian municipalities have intended to supplement the centralized drainage system with decentralized stormwater management practices, such as bioretention systems, to better management urban stormwater runoff. However, it is not uncommon to observe that bioretention systems leach nutrients (both phosphorus (P) and nitrogen (N)), particularly in the beginning of their operation. This study examined the effects of six amendments selected primarily for reducing P leaching of bioretention systems through monitoring six amendment and two control cells in the field in the growing season of 2020. In addition, two amendments were examined in the laboratory setting to investigate the influence of amendment mixture percentage on their performance using laboratory columns. The field results showed that all amendments had the capability of preventing or mitigating P leaching from bioretention systems, with the water treatment residual (WTR) outperforming all other amendments, followed by the sorptiveMEDIA (SM) and activated aluminum (AA). In addition, some of the amendments (i.e., drywall (DRY), WTR, and SM) were also found to be beneficial in reducing the N leaching to a slight degree, whereas eggshell (EGG) introduced an extra source of N leached. Furthermore, the temporal evolution of the P leaching of the amendment cells was found to be different from that of the control cells, whereas same result was not observed in the N leaching. The laboratory results further confirmed the effectiveness of SM and AA in reducing P leaching. The results also revealed that the increase of the mixture percentage of amendment did not always improve the performance (in term of P removal rate) and reduce the degree of P leaching. The observed difference in the P leaching behavior between the bioretention cells and columns suggests that caution should be paid when translating laboratory knowledge into the field.
Effects of Amendments on Bioretention Systems: The Field and Laboratory Investigations
Lecture Notes in Civil Engineering
Gupta, Rishi (editor) / Sun, Min (editor) / Brzev, Svetlana (editor) / Alam, M. Shahria (editor) / Ng, Kelvin Tsun Wai (editor) / Li, Jianbing (editor) / El Damatty, Ashraf (editor) / Lim, Clark (editor) / Zhang, Yihui (author) / Skorobogatov, Anton (author)
Canadian Society of Civil Engineering Annual Conference ; 2022 ; Whistler, BC, BC, Canada
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 ; Chapter: 81 ; 1277-1289
2023-08-17
13 pages
Article/Chapter (Book)
Electronic Resource
English
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