Control Approach to Non-biodegradable Organic Matter in Roadway Runoff

摘要

Roadway dust includes non-biodegradable and hazardous organic pollutants such as polycyclic aromaticnhydrocarbons (PAHs). The objective of this study was to estimate the proportion of non-biodegradable organicnmatter (NBOM) in roadway runoff using a biodegradability test, and to reveal the effectiveness of its removalnusing soil infiltration. Total organic carbon (TOC) concentration of roadway runoff was approximately 20 mg/Lnand its 74% was estimated to be NBOM. The percentage of NBOM in particulate organic carbon (POC) reachedn96%, which was much higher than that in dissolved organic carbon (DOC, 40%). Although 5 polycyclic aromaticnhydrocarbons were detected in roadway runoff, they were removed by the aerobic biodegradation for 100ndays incubation. The soil infiltration was able to reduce NBOM in roadway runoff by 93% in POC and 55% innDOC, whereas the removal efficiencies of biodegradable organic matter in POC and DOC were only 25% andn59%, respectively. Consequently, the soil infiltration is thought to be a potential measure to reduce NBOMnloads to water environment through roadway runoff.