Answered: b. Based on concentration and the…

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter10: Oxidation, Degradation, Corrosion, Electroprocessing, Batteries, And Fuel Cells

Section: Chapter Questions

Problem 10.1P

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1a. In water and wastewater containing particles that tend to coalesce upon colliding with other particles, and having a range of particle sizes, fast settling larger particles overtake slow settling smaller particles (in accordance with Stokes' law) possibly colliding and coalescing with these smaller particles. Under these conditions, particles tend to grow in size and settle at still higher downward velocity. This is known as __________ settling.

b. Based on concentration and the tendency of particles to interact, particle settling in a water or wastewater clarifier can be described as:

a) compression

b) discrete particle settling

c) Any or all of these types of settling may occur in a single clarifier

d) hindered (also called zone) settling

e) flocculent settlin ? ?

c. Rectangular clarifiers typically use either chain-and--------- or traveling- ----------type sludge collector mechanisms.

d.When laminar fluid flow occurs around a discrete spherical particle settling through the fluid (a good approximate characterization of the settling of real particles in water and wastewater treatment systems), the downward force of gravity on the particle (i.e., particle weight) is eventually balanced by the sum of the upward buoyant force and fluid drag force to yield a constant downward velocity called the ________ settling velocity of the particle.

e.A typical design surface loading rate (also called overflow rate) at the average flow rate passing through a wastewater clarifier is ______ gal/ft²-day.

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