Stormwater Symposium

Oral

393823 - Iron-Enhanced Sand Filter Performance for Phosphorus, Metals, and Trace Organic Contaminants: Overview of Three Field Studies

Thursday, June 7
8:30 AM - 10:00 AM
Location: Greenway AB

Untreated stormwater may facilitate transport of contaminants including nutrients, metals, bacteria, and organic chemicals to receiving waters. Generally, filtration-based stormwater control measures (SCMs) are effective for particulate-bound contaminants, but less effective for dissolved or colloidal contaminants. Chemisorbent- or biosorbent-amended filtration SCMs may improve removal of some dissolved constituents. Iron-enhanced sand filters (IESFs) have shown potential to attenuate dissolved phosphorus, which has been problematic for some biosorbents. Thus, numerous IESFs have recently been installed in Minnesota. Although laboratory and some field-scale IESFs meet performance expectations, others exhibit variable or poor performance. In addition, limited prior field studies impede trend and determinant analysis. Fortunately, existing IESF installations and monitoring data provide opportunities for meta-analysis. Accordingly, MPCA has collaborated with local jurisdictions to collect new field data to support their monitoring programs, aggregate multiple existing datasets, and address IESF information needs. This presentation describes three monitoring projects’ strategies and progress to date, summarizes current data from 8-10 IESFs representing several hundred grab and automated samples, and discusses preliminarily identified spatiotemporal performance patterns. The focus is on parameters analyzed across IESFs (i.e., nutrients, TSS, metals), but includes less common analytes (e.g., bacteria, chloride, flame-retardants, PAHs, pesticides, and pharmaceuticals). The goal of this initiative is to develop information and analysis to augment our understanding of IESF performance. Researchers, practitioners, and agencies will benefit from increased communication, analysis, and understanding of IESF information at multiple scales.

David J. Fairbairn


Minnesota Pollution Control Agency

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393823 - Iron-Enhanced Sand Filter Performance for Phosphorus, Metals, and Trace Organic Contaminants: Overview of Three Field Studies



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