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Total Suspended Solids - inorganic suspended matter with a diameter >4.5 um
3 Types of Mixtures
Properties of Colloids
Usually do not settle out - so small that they remain in medium
Brownian motion - random zigzags due to collisions
Which organic materials would a 4.5um filter remove?
oil & grease
6 problems with TSS
5 ways to measure TSS
PSA - particle size analyzer
SDI - silt density index
What does PSA & SDI stand for
particle size analyzer
silt density index
Which optical properties of water does turbidity account for?
What does Nephelometry of a Nephelometer measure?
Which law gives the terminal Velocity o a particle falling through a medium?
Ways to increase settling efficiency (3)
use very thin film of continuous media
slow flow rates
Name the 3 steps in Clarification
Coagulation neutralizes the surface charge by;
increasing ionic strength (add salts)
add coagulant (Alum)
two main filtration processes
In which zone of a clarifier does coagulations occur?
Rapid Mix Zone
In which zone of the clarifier does flocculation occur?
Slow Mix Zone
In a flash mixer, why are the coagulant chemicals mixed violently when added to the water?
to evenly distribute the chemicals
2 Benefits of Inclined Plate Clarifiers?
Settling time is reduced
takes up less space then ponds or tanks
benefit of pressure filters?
speeds up filtration process
When using a Finer Surface Filter, does water or particles pass through?
TSS ENVS348 SAIT CLT2