『Abstract
　For a half century, total suspended solids (TSS) has been the most commonly utilized particulate matter (PM) gravimetric index for wastewater. While TSS has been extended to urban runoff, runoff phenomena are unique. Runoff is unsteady and transports heterodisperse inorganic granulometry, giving rise to the PM index, suspended sediment concentration (SSC). With respect to PM-associated chemical oxygen demand (CODp) in runoff, it is hypothesized that, while the TSS method can represent effluent CODp, the SSC method is required to represent influent CODp. CODp and PM indices (TSS and SSC) for runoff events with mass balances and manual sampling are analyzed to investigate this hypothesis. This study examined a series of rainfall-runoff events captured from an instrumented fully paved urban catchment subject to traffic loadings in Baton Rouge, LA. Results indicate TSS generated substantial event-based mass balance errors for CODp and Δmp (mg/g) across a hydrodynamic separator (HS) as compared to SSC. TSS underestimates sediment-bound COD (＞75μm), a significant portion (maximum of 63％ and median of 50％) of influent load. Negative bias by the TSS method for influent CODp load increases as the heterodisperse particle size distribution becomes coarser. Above a PM of 250 mg/L, underestimation of CODp by the TSS method is statistically significant. Utilizing the SSC method, CODp reduction by a HS upstream of a batch clarifier (BC) indicates that a HS does not provide CODp reduction, compared to a BC with 60 min of residence time. Representative PM and CODp assessment suggests frequent BMP and drainage system maintenance to ensure proper operation and reduce pollutant elution.

Keywords: Particulate matter; COD; TSS; Particle size distribution; BMP; Unit operations』

1. Introduction
　1.1. Oxygen demand indices for urban rainfall runoff
　1.2. Particulate matter indices for urban rainfall runoff
　1.3. Heterodisperse PSDs and subsampling TSS
2. Objectives
3. Methodology
　3.1. Urban-paved watershed and treatment facility
　3.2. Wastewater sample and urban atmospheric rainfall collection
　3.3. PSD and COD (TSS and SSC method) analysis
　3.4. Phase fractionation of CODT between CODP fractions and CODd
　3.5. PM fraction analyses
　3.6. CODp concentration (mp) (mg/g)
　3.7. Mass balance, QA/QC, and statistical analysis
4. Results and discussion
　4.1. Comparison of PSD and organic content between wastewater and urban runoff
　4.2. BMP performance for CODp characterized by TSS and SSC methods
　4.3. SSC and TSS as a measure of particulate-bound COD in rainfall runoff
　4.4. The role of PSDs on COD concentration measurement by TSS and SC method
　4.5. PLM to model relationship between PM and CODp
　4.6. Transport of CODp associated with three size fractions and CODd in urban runoff
　4.7. Treatment performance of HS, BC, and both for CODp and CODd in urban runoff
　4.8. Comparison of CODT in urban runoff, atmospheric rainfall, and wastewater with literature
5. Conclusions
Nomenclature
References