Author(s): Husna Takaijudin, Aminuddin Ab. Ghani, Nor Azazi Zakaria, Tze Liang Lau
Linked Author(s): HUSNA TAKAIJUDIN
Keywords: Bioretention, soil column studies, filter media depth, hydraulic conductivity (Ksat), stormwater treatment
Abstract: Media depth is the main design element in bioretention system. However, the range of depth which used in this approach is still questionable when dealing with the hydraulic and treatment performance. Hence, this paper investigates the relationship between hydraulic and stormwater treatment performance in predicting long-term performance of bioretention by variation of filter media depths. Preliminary studies focused on three small-scale columns, namely C1, C2 and C3 with 74mm in diameter and 700 mm in height. Column C1, C2 and C3 comprise 300 mm, 400 mm, 500 mm deep engineered soil media, respectively. Soil composition of engineered soil media consists of 50% medium sand, 30% topsoil, and 20% organic leaf compost. Approximately 3. 3 L of collected raw stormwater samples were poured into each column in four (4) repetition cycles. Both influent and effluent were collected and tested. Declination trends was observed in hydraulic conductivity (Ksat) as the sedimentation start to develop and clogged on top of surface layer. The results revealed that deeper media depth effectively removed the wastes with the mean�standard deviation (SD) for removal is at 93. 4�5. 2, 69. 5�17. 0, 40. 0�13. 7% for TSS, TN and TP, respectively. The responses between hydraulic and treatment performance are established using regression method. The relative K, TSS and TP removal had good agreement because R2 is within 0. 72 to 0. 91. Hence, the prediction of infiltration parameters can be relied on the contaminant removal through sedimentation and filtration process
Year: 2017