PROTOCOLS FOR QUANTIFYING SOLIDS REMOVAL PERFORMANCEDURING CONTROLLED TESTING OF MANUFACTURED TREATMENTDEVICES

摘要

As more manufactured stormwater treatment devices enter the market, stormwater managersare searching for effective and rapid methods for evaluating device performance. Manyagencies require vendors to test full-scale versions of their devices under controlledconditions. The most common parameter used to document performance is suspended solids.Many pollutants attach to the solids and a solids simulant is relatively easy to generate. Inaddition, solids are comparatively easy and inexpensive to quantify. However, a controversystill exists in the professional community as to whether total suspended solids (TSS) orsuspended sediment concentration (SSC) should be measured (several agencies require bothbut only use one to verify device performance). Second, agencies often specify differentsimulant mixtures for controlled tests. Third, sampling protocols, in particular samplepreparation and filter nominal pore diameter, are not well-defined. Sample location in theflow stream can greatly affect the results, as can the procedure used for sample splitting. Thispaper focuses on the protocol developed and evaluated by two academic testing organizationsduring recent evaluations of two devices that were evaluated for solids removal performance.This protocol is repeatable and is not specific to solids testing, but allows for a single sampleto be split into size fractions for subsequent particle-size and pollutant-association analysis.