Provider: Ingenta Connect
Database: Ingenta Connect
Content: application/x-research-info-systems
TY - ABST
AU - Ah Yuen, Weng
TI - Empirical Equations for the Limiting Solids Flux of Final Clarifiers
JO - Water Environment Research
PY - 2002-03-01T00:00:00///
VL - 74
IS - 2
SP - 200
EP - 209
KW - LIMITING SOLIDS FLUX
KW - UNDERFLOW VELOCITY
KW - MODELING
KW - FINAL CLARIFIER
KW - SURFACE AREA
N2 - Using the solids flux theory, two quantities (i.e., the dimensionless limiting solids flux [*G* = *kG*_{L}/υ_{o}
] and the dimensionless underflow velocity [*U* = *F*_{R}/(Aυ_{o})] are introduced for a final clarifier based
on the Vesilind equation of sludge zone-settling velocity (υ = υ_{
o
}exp[−*kX*], where *X* is the suspended solids concentration, υ_{
o
} and *k* are empirical coefficients, and *G*_{L}
, *F*_{R}
, and *A*
are the limiting solids flux, recycle flowrate, and surface area of the settling tank, respectively). In this paper, the dimensionless limiting solids flux is shown to be a function of the dimensionless underflow velocity only and is accurately represented by empirical equations. The limiting
solids flux can, thus, be easily calculated by using the empirical equations without resorting to tedious numerical procedures. Furthermore, using the dimensionless quantities (*G* and *U*), two final clarifier equations that express the relationship among suspended solids concentration,
surface area of the clarifier, recycle flowrate, and wastewater flowrate are derived. Their applications to final clarifier analysis and to determining required surface area of final clarifier are illustrated.
UR - http://www.ingentaconnect.com/content/wef/wer/2002/00000074/00000002/art00011
M3 - doi:10.2175/106143002X139910
UR - https://doi.org/10.2175/106143002X139910
ER -