6533b7d2fe1ef96bd125ebc5
RESEARCH PRODUCT
Characterization of activated sludge settling properties with a sludge collapse-acceleration stage
Aurora SecoJosé FerrerE. AsensiE. Alemanysubject
Suspended solidsHindered settlingMaterials scienceFiltration and Separation02 engineering and technologyMechanics021001 nanoscience & nanotechnologyTwo stagesAnalytical ChemistryIndustrial wastewater treatmentAccelerationSludge accelerationActivated sludge020401 chemical engineeringSettlingHomogeneousActivated sludgeStage (hydrology)0204 chemical engineering0210 nano-technologyMATEMATICA APLICADARichardson-Zaki modelTECNOLOGIA DEL MEDIO AMBIENTEdescription
Abstract The sedimentability of the activated sludge can be affected by the presence of a large variety of coagulants and polymers from a previous physical-chemical process. In this paper, the activated sludge settling process in industrial wastewater treatment plants where the sludge does not settle in a conventional way is studied. The two observed constant hindered settling velocity stages and the instant the intermediate sludge acceleration period occurs are described. A variation of the Richardson and Zaki model is used to characterize the two stages of constant settling velocity. The concentration of suspended solids, where a sudden decrease of hindered settling velocity was observed, is calculated. Finally, a new hypothesis to explain the processes triggering the collapse of the initial homogeneous sludge structure and the existence of an acceleration period is formulated.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-01-31 |