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A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities
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Improving bioretention/biofiltration performance with restorative maintenance.

Robert A Brown1, William F Hunt

  • 1Biological and Agricultural Engineering, North Carolina State University, Raleigh, NC 27695-7625, USA.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|January 12, 2012
PubMed
Summary

Bioretention (biofiltration) systems need proper installation and maintenance. Repairing these stormwater controls significantly improved water storage, infiltration, and pollutant removal, demonstrating maintenance is critical for performance.

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Area of Science:

  • Environmental Engineering
  • Urban Hydrology
  • Stormwater Management

Background:

  • Bioretention cells are popular stormwater control measures.
  • Poor installation and lack of maintenance often compromise bioretention performance.
  • Inadequate storage volume and infiltration rates are common post-construction issues.

Purpose of the Study:

  • To assess the impact of maintenance and media depth on bioretention cell performance.
  • To quantify improvements in storage volume, infiltration, and pollutant removal after repairs.
  • To compare the effectiveness of different media depths (0.6 m vs. 0.9 m).

Main Methods:

  • Excavation and replacement of the top 75 mm of fill media in two sets of bioretention cells.
  • Measurement of surface storage volume and infiltration rates before and after repair.
  • Monitoring of overflow volume and effluent pollutant loads.
  • Comparison of performance between cells with 0.6 m and 0.9 m media depths.

Main Results:

  • Repairs increased storage volume by nearly 90% and infiltration rates by up to 10 times.
  • Overflow volume decreased from 35-37% to 11-12% post-repair.
  • Effluent pollutant loads were significantly reduced after maintenance.
  • Deeper media cells (0.9 m) showed slightly better outflow reduction than shallower cells (0.6 m).

Conclusions:

  • Maintenance is critical and highly beneficial for restoring poorly performing bioretention systems.
  • Repairs effectively enhance stormwater management functions, including pollutant removal.
  • While deeper media offers some benefits, the improvement may not justify the additional costs.