STORMWATER METALS REMOVAL BY MEDIA FILTRATION: FIELD ASSESSMENT CASE STUDY
In 2003, the Port installed eight Downspout Stormfilter units and began testing them for removing zinc in runoff from a 1-acre Galvalume metal-roofed cargo building. This approach examined runoff treatment by three media as an alternative to source controls for the associated zinc such as re-roofing or painting. A total of 7 storms were sampled between August 2003 and January 2004, ranging from 0.03“ to 0.38” total rainfall. Zinc, DOC, hardness and nutrient concentrations in the roof runoff varied over an order of magnitude during the study and decreased with rainfall volumes and possibly seasonal factors. Zinc in the roof runoff ranged from 0.42 mg/l to 14.7 mg/l and averaged 86% dissolved. The peat and leaf compost removed dissolved zinc at similar rates averaging 81% and 76%, respectively, though they fell short of achieving consistent effluent quality. The soy bean hull medium experienced subsidence that lead to short circuiting of the filter unit with unsuccessful attempts to correct it. The supplier is expected to rectify the physical properties of the soybean hulls for future testing. Potential collateral effects of each medium appeared to be positive in raising the pH of the slightly acidic runoff and providing nominal levels of DOC (an aid to reducing dissolved metal bioavailability). Each medium released nominal levels of nitrogen and phosphorus that dropped to insignificant concentrations after the first few storms sampled. Further testing will be carried out during 2004.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
Document Type: Research Article
Publication date: 01 January 2004
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 These proceedings are not peer reviewed. A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.
WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
- Subscribe to this Title
- Membership Information
- About WEF Proceedings
- WEFTEC Conference Information
- Learn about the many other WEF member benefits and join today
- Ingenta Connect is not responsible for the content or availability of external websites