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NOAA Fisheries Northwest Science Center Publication Details

CitationColt, J., G. Tchobanoglous, R.B. Johnson. 2025. Measurement of settling velocities of feeds and fecal solids in aquacultural applications, A Critical Review. Aquacultural Engineering, DOI: https://doi.org/10.1016/j.aquaeng.2025.102548 (https://doi.org/10.1016/j.aquaeng.2025.102548)
TitleMeasurement of settling velocities of feeds and fecal solids in aquacultural applications
Publication Year2025
Volume111
Pages102548
Keywordstotal suspended solids, nonsettleable solids, fecal solids, settling rates, settleable solids, feeds
AbstractThe majority of solids in intensive culture systems are from uneaten feed and fecal solids. Information on the settling velocity of feeds and fecal solids are needed for the design of settling basins and modeling of the impacts of netpens. The Umwelt und Fluid Technik (UFT ) column developed in Germany in the 1980s has become the dominant column type for wastewater settling testing. The primary advantage of this column compared to conventional columns is the preconcentration of the settleable solids, elimination of problems with time zero estimates, and reduced sampling requirements. The conventional settling velocity analysis presented in standard references, while theoretically correct, and is virtually impossible to apply to actual fecal waste because of uncertainty in numbers, mass, shape, density, and drag characteristics. In addition, this analysis is unneeded, as the removal efficiency is measured directly in the settling column tests. Because the UFT column uses only the settl
Official CitationColt, J., G. Tchobanoglous, R.B. Johnson. 2025. Measurement of settling velocities of feeds and fecal solids in aquacultural applications, A Critical Review. Aquacultural Engineering, DOI: https://doi.org/10.1016/j.aquaeng.2025.102548
Links (https://doi.org/10.1016/j.aquaeng.2025.102548)