Water, Wastewater & Stormwater

Oral

394035 - Occurrence and removal of polychlorinated biphenyls (PCBs) in urban stormwater

Wednesday, June 6
4:00 PM - 5:30 PM
Location: Greenway EF
Co-Authors: Staci Cappozi, College Park – University of Maryland, College Park; Allen Davis, College Park – University of Maryland, College Park; Birthe Kjellerup, College Park – University of Maryland, College Park

PCBs are a group of chlorinated organic compounds. They are persistent in the environment and threaten the health of humans and wildlife. Urban stormwater runoff is considered as an important source of many pollutants, including PCBs, to aquatic environments. In this study, affiliations of PCBs with the size and depth of accumulated stormwater sediments, and their biodegradation potential were studied. Total PCB concentrations in the settleable fraction (~25 to 75 µm, total organic matter (TOM): 13.66%) of stormwater sediments were found to be significantly higher than in the sediment fraction (> 75 µm, TOM: 6.97%). In bioretention media cores, PCB concentrations decreased as bioretention media depth increased (from 32.0 ± 2.0 ng/g at the surface to 22.6 ± 7.1 ng/g at 30 cm deep), and with distance from the stormwater entrance (from 41.1 ± 2.3 ng/g at the entrance to 31.6±2.8 ng/g at 3-m distance). PCB congeners extracted from the sediments were dominated by tetra-, penta-, and hexa- homolog groups. Among the 209 congeners, 3,3’-dichlrobiphenyl (PCB 11), which is emerging as a marker of non-legacy PCB contamination, was detected in all the sediment samples as one of the highest PCB concentrations (9.9 ng/g). Additionally, polymerase chain reaction (PCR) results showed that putative anaerobic dechlorinating bacteria were present in the bioretention system. Results indicate that bioretention is a promising management practice to control runoff PCBs.

Siqi Cao

Student
University of Maryland, College Park

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394035 - Occurrence and removal of polychlorinated biphenyls (PCBs) in urban stormwater



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