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Final Exam - Erosion and Sediment Control(67 questions and answers).

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Institution Erosion And Sediment Control
Course Erosion and Sediment Control
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Final Exam - Erosion and Sediment Control(67 questions and answers).

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Final Exam - Erosion
and Sediment
Control(67 questions
and answers)
if erosion control practices fail - answer sediment-
laden stormwater runoff will still be a concern


WHAT IS THE PROBLEM? - answer Sediment-laden
water contains very fine colloidal silt and clay
particles Particles stay in suspension for a
extended period of time


Flocculants - answer Facilitate coagulation and
flocculation Increases sedimentation rate
Decreases detention time


Flocculant def - answer is a chemical additive that
acts as a binder for soil particles


Colliods - answer (small particles, sometimes
magnetically charged) which remain in suspension
and are difficult to settle out

, Flocculation Agents (3 Types) - answer Aluminum
sulfate (alum) - neutral ionic charge (pH
dependent)


Polyacrylamide - can be cationic, anionic, or
nonionic (soil specific)


Chitosan - cationic


Flocculant Types - answer Synthetic- Cationic,
Anionic, Nonionic, PAM


Inorganic- low MW, small size, Alum, PAC


Bio/Natural- Polysacchariades, Tannins, Celluslose,
Starch


Stimuli Responsive- Thermo, pH, Electromagnetic
responsive


Flocculant Charges - answer Anionic (-) nontoxic
Cationic (+) toxic
Nonionic (no charge) nontoxic

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