Membrane and Water Treatment

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Evaluation on the suspended solids and heavy metals removal mechanisms in bioretention systems

  • Geronimo, Franz Kevin F. (Department of Civil and Environment Engineering, Kongju National University) ;
  • Maniquiz-Redillas, Marla C. (Civil Engineering Department., 2401 Taft Avenue, De La Salle University-Manila) ;
  • Hong, Jungsun (Department of Civil and Environment Engineering, Kongju National University) ;
  • Kim, Lee-Hyung (Department of Civil and Environment Engineering, Kongju National University)
  • Received : 2018.05.21
  • Accepted : 2018.09.15
  • Published : 2019.01.25
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Abstract

Application of bioretention systems in Korea is highly considered due to its minimal space requirements, appropriateness as small landscape areas and good pollutant removal and peak hydraulic flow reduction efficiency. In this study, the efficiency of two lab-scale bioretention types having different physical properties, media configuration and planted with different shrubs and perennials was investigated in reducing heavy metal pollutants in stormwater runoff. Type A bioretention systems were planted with shrubs whereas type B were planted with perennials. Chrysanthemum zawadskii var. latilobum (A-CL) and Aquilegia flabellata var. pumila (A-AP) respectively were planted in each type A bioretention reactors while Rhododendron indicum linnaeus (B-RL) and Spiraea japonica (B-SJ), respectively were planted in each type B bioretention reactors. Results revealed that the four lab-scale bioretention reactors significantly reduced the influent total suspended load by about 89 to 94% (p<0.01). Type B-RL and B-SJ reactors reduced soluble Cr, Cu, Zn, and Pb by 28 to 45% that were 15 to 35% greater than the soluble metal reduction of type A-CL and A-AP reactors, respectively. Among the pollutants, total Cr attained the greatest discharged fraction of 0.52-0.81. Excluding the effect of soil media, total Pb attained the greatest retention fraction in the bioretention systems amounting to 0.15-0.34. Considering the least discharge fraction of heavy metal in the bioretention system, it was observed that the bioretention systems achieved effectual reduction in terms of total Cu, Zn and Pb. These findings were associated with the poor adsorption capacity of the soil used in each bioretention system. The results of this study may be used for estimating the maintenance requirements of bioretention systems.

Keywords

Acknowledgement

Grant : Development of Rain Garden Technology for Improvement of Urban Water Environment

Supported by : Kongju National University

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