Effects of convective-diffusive vertical mixing on the conception of rectangular settling basins

Research areas:
Year:
2018
Authors:
Journal:
Stochastic Environmental Research and Risk Assessment
Volume:
32
Number:
5
Pages:
1457-1463
Month:
May
ISSN:
1436-3259
Abstract:
Collection efficiency $\eta$ of rectangular settling basins is studied in this note for two cases: (i) with no mixing and (ii) with perfect vertical mixing. At first, well known reference solutions corresponding to suspended solids with constant settling velocity are presented. The effects on deposition of suspended solids with varying settling velocities are then studied. Finally, original exact solutions for $\eta$ are obtained for gamma distributed settling velocities. The reference solutions are perfectly compatible with these more general solutions.