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Evaluation of pathogenic indicator bacteria in structural best management practices
1Department of Civil and Environmental Engineering, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA. jackie_zhang@uml.edu
Summary
Vortechs Best Management Practices (BMPs) partially removed pathogenic indicator bacteria (PIB) but did not eliminate them, posing public health risks. Bacteria also re-suspended within the BMPs, increasing concentrations in sump water.
Area of Science:
- Environmental Engineering
- Microbiology
- Water Quality Management
Background:
- Pathogenic indicator bacteria (PIB) in stormwater runoff pose risks to public health and aquatic ecosystems.
- Best Management Practices (BMPs) are crucial for mitigating stormwater pollution.
- Vortechs systems are structural BMPs designed for stormwater treatment.
Purpose of the Study:
- To evaluate the bacteria removal efficiency of Vortechs BMPs.
- To investigate bacteria re-suspension and survivability within Vortechs.
- To assess the public health implications of Vortechs treatment on PIB.
Main Methods:
- Sampling of twelve rain storms from 2004-2005 at two Vortechs sites in Providence, Rhode Island.
- Analysis of five pathogenic indicator bacteria: E. coli, enterococci, fecal streptococci, total coliform, and fecal coliform.
- Comparison of PIB concentrations in influent and effluent, and assessment of bacteria concentrations in sump water.
Main Results:
- Vortechs achieved partial removal of PIB (39-86%), but effluent concentrations remained high.
- Indicator bacteria concentrations in sump water were 1.2-2.6 times higher than influent concentrations, indicating re-suspension.
- Lower bacterial concentrations at Site 2 suggested higher contamination from highway runoff, despite low survivability in sump water.
Conclusions:
- Vortechs BMPs provide partial but insufficient removal of PIB, necessitating further treatment to ensure public health safety.
- Bacteria re-suspension within Vortechs contributes to elevated concentrations in sump water.
- Site-specific factors, such as highway runoff, significantly influence bacterial loading and treatment efficacy.
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