Skip to main content

PATHOGEN REMOVAL IN CONSTRUCTED WETLANDS FOCUSING ON BIOLOGICAL PREDATION AND MARINE RECREATIONAL WATER QUALITY

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

Constructed wetlands can be extremely successful in removing a variety of pollutants from water which passes through them, including pathogenic bacteria, viruses, and protozoa. Removal mechanisms have been hypothesized but have rarely been quantified. Grazing experiments were performed to evaluate the potential contribution to pathogen consumption made by mussels (Mytilus edulis) and rotifers (Brachionus plicatilis) using fluorescent labeled enterococci and latex microspheres as food sources. Enterococcus bacteria were chosen due to their use as an indicator of marine recreational water quality. With mussel predation, enterococcus concentration was reduced by 90% (1-log removal) after 2 to 4 hours, and an average 97.2% reduction was seen after 24 hours. Rotifer average clearance rates ranged from 0.51 to 35.79 μL/individual*hour, and average ingestion rates ranged from 24 to 676 food particles/individual*hour. When compared to the pathogen removal rates observed in treatment wetlands, these clearance rates, consistent with those cited in the literature, illustrate the potential for grazing to make a substantial contribution to pathogen removal in wetlands containing these predatory organisms. These data were applied to a case study of Talbert Marsh, a restored wetland located in Huntington Beach, California that receives controlled stormwater discharges and acts an apparent source of enterococcus. While Talbert Marsh could be modified to enhance biological pathogen removal, alteration of the wetland flow patterns and substrate would probably have a more substantial impact in enhancing pathogen removal within the wetland.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864703784639408

Publication date: 2003-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more