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Long-Term Performance of Enhanced Bioretention Media Under Nutrient Rich Runoff in Tropical Climate

Author(s): Hui Weng Goh, Chee Hui Lai, Nor Azazi Zakaria

Linked Author(s): Hui Weng Goh

Keywords: Best Management Practices (BMPs), bioretention system, hydraulic conductivity, long-term performance, nutrient removal

Abstract: Treating nutrient from stormwater runoff is necessary to enhance public health and to protect the quality of environment. In recent years, bioretention system has become one of the most common green infrastructures as Best Management Practices (BMPs) for stormwater management in the Asian-Pacific Region. This study investigates the performance of different types bioretention media in treating nutrient-rich runoff over a long period of time. Of five types of enhanced bioretention media tested (coconut husks, tyre crumbs, shredded printed papers, crushed cockle shells, and shredded newspapers), vegetated mesocosm studies on crushed cockle shells (CS) and shredded newspapers (NP) were chosen to be extended to 49 weeks to compare with the standard bioretention media (STD) on their long-term performance in hydraulic conductivity, total nitrogen (TN), total suspended solid (TSS), and total phosphorus (TP) removals, and N retention ability within soil and plant. The hydraulic conductivity for all three types of media changes over time, which increases signi?cantly to an average range of 170 to 178 mm/hour at week 15, and the hydraulic conductivity declines gradually to an average range of 112 to 134 mm/hour towards the end of the study. The long-term monitoring study indicated that NP's result in TSS and TN is the most significant among all types of bioretention media, followed by. As for TP removal, CS performed the best, followed by NP for vegetated mesocosm. The results show that both enhanced bioretention media have better performance in nutrient removal over a long-time period


Year: 2017

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