Novel Bioretention System for Sustainable Urban Stormwater Management

Technology Overview

In an urban setting, rainwater flows over rooftops and concrete surfaces picking contaminants including bacteria, oil & grease, metals and pesticides before entering the sewer systems. These pollutants will eventually end up in the surrounding waterways contributing water pollution and increasing the treatment load to municipal wastewater treatment plants. Green infrastructure such as green rooftops, roadside plants and landscaped parks can potentially reduce the amount of polluted stormwater runoff, hence, reducing the reliance on wastewater treatment plants.

Bioretention systems comprising of a novel engineered filter media and various types of plants were developed to mitigate the negative effects of urban stormwater runoff. This novel modular bioretention system process consists of detention, conveyance, sedimentation, filtration and biological denitrification. Compared to conventional media, the modular system is more cost-effective and customizable in managing the non-point source pollution.

Technology Features & Specifications

  • Soak-away garden comprising of various types of plants - E.g. talipariti tiliaceaum, syzygium leucoxylon and paederia foetida
  • Engineered soil utilizing recycled materials
  • Bioretention system consists of a three-layer design including filtration media layer, transition layer, and drainage layer
  • Improves total suspended solids, nitrogen and phosphorus removal compared to conventional media 
  • Improves downstream aquatic ecosystem health and flood control

Potential Applications

This technology can be implemented near development sites and impervious areas containing pollutants and suspended solids. The bioretention system can be constructed near carparks, farms and housing areas.  For sites with high inorganic nitrogen contamination, bioretenton with saturated anoxic zones (the bottom media remains continuously submerged) can be installed. 

Customer Benefits

  • Removes pollutants in stormwater runoff to meet pollutant removal guidelines - TSS (80 %), TN (45 %) and TP (45 %)
  • Technology can be adopted by SME landscape contractors, schools and homeowners
  • Improves discharged stormwater quality while contributing to the greenery aesthethics 
  • Improves aquatic ecosystem health and reduced eutrophication

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