Check that the upward liquid velocity between plates does not exceed settling velocities (e.g., maintain for inclined plates). Standard Design Criteria Summary Typical Value range Plate Angle Plate Spacing Surface Loading Rate (Application dependent) Plate Length Recommended Resources for PDF Downloads
SOR=QN×W×L×cos(θ)cap S cap O cap R equals the fraction with numerator cap Q and denominator cap N cross cap W cross cap L cross cosine open paren theta close paren end-fraction Critical Flow Velocity ( Vccap V sub c
to facilitate smooth mechanical scraping or hydrostatic desludging. lamella clarifier design calculation pdf downloadl better
) that exceeds the surface area of a traditional horizontal clarifier by utilizing the horizontal projections of multiple inclined plates. Effective Settling Area ( cap A sub e f f end-sub
The most critical metric in clarifier design is the . It represents the flow rate of water per unit of effective settling area. It is typically expressed as gpm/ft² or m³/m²·hr . Check that the upward liquid velocity between plates
N=ArApcap N equals the fraction with numerator cap A sub r and denominator cap A sub p end-fraction To ensure laminar flow (essential for settling), should ideally be less than 500 :
) based on pilot testing or standard literature for your specific particle type. Effective Settling Area ( cap A sub e
vmean=QN⋅p⋅Wv sub m e a n end-sub equals the fraction with numerator cap Q and denominator cap N center dot p center dot cap W end-fraction
Plate area: 1.25 m × 2.5 m = 3.125 m² N = 13.9 m² / 3.125 m²/plate ≈ 4.45 plates
The following mathematical sequence establishes the exact sizing of a lamella clarifier unit based on fluid dynamics and geometric projection.
Uneven flow distribution across plates reduces efficiency. Use perforated baffle walls or specialized inlet channels to evenly distribute incoming water.
