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Drinking Water Treatment Certification (Study Guide For Water Treatment Certification) –Q&A
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Drinking Water Treatment Certification (Study GuideFor Water Treatment Certification) –Q&A
Colloids Correct Ans - fine particles that do not dissolve
Coagulation Correct Ans - Clumping of particles to form larger
particles caused by use of chemicals (coagulants)
Need for coagulation and flocculation Correct Ans - remove particulate
impurities, especially non settleable solids, and color from ater being treated
Best ph for coagulation Correct Ans - between 5 and 7
Primary purpose of flash mixing Correct Ans - rapidly mix and
uniformly distribute coagulants
primary coagulants/coagulants aids Correct Ans - primary
coagulantes neutralize electrical charge causing clumps. coagulant aids add
density to clumps so floc will not break
methods of mixing coagulants Correct Ans - hydraulic, mechanical,
diffusers and grid system, pumped blenders
hydraulic mixing device Correct Ans - turbulence created by flowing
water to mix chemicals. baffles and throttle valves
flocculation Correct Ans - slow stirring process that causes gathering
of coagulated particles into larger floc particles
advantage of vertical flocculators vs horizontal Correct Ans - require
less maintenance by eliminating submerged bearings and packings
process that removes suspended solids after coagulation-flocculation
Correct Ans - sedimentation and filtration
common lab tests to monitor coagulation-flocculation Correct Ans -
turbidity, alkalinity, color, ph, chlorine demand
, purpose of sedimentation process Correct Ans - remove suspended
solids that are denser than water and reduce load on filters
how is sedimentation accomplished Correct Ans - decreasing the
velocity of water to allow heavier particles to settle out
presedimentation is installed in.... Correct Ans - facilities where water
source is directly diverted from rivers or streams which can be contaminated
by overland runoff and point source waste discharges
point source Correct Ans - discharge that comes from the end of a pipe
why is treatment referred before sedimentation Correct Ans - to
convert finer particles that do not readily settle into larger particles
four zones in sedimentation basin Correct Ans - inlet, settling, sludge,
outlet
pros and cons of double deck basin Correct Ans - pros - provide twice
the surface area of single basin of equivalent dimensions. conserve land area.
cons - higher operation and maintenance costs. entire operation may shut
down if an equipment problem develops in either deck
what material is used to support granular filter materials Correct Ans -
gravel
what units is filtration expressed in Correct Ans - gallons per minute
per square foot
when is filtration process stopped Correct Ans - either just before
clogging, a specified time period has passed, or a specified head loss is
achieved
what aspects of filtration are controlled by the filter control system
Correct Ans - rate-of-flow, split-flow, declining-rate, self-backwash
what is the primary purpose of activated carbon (granular) as filter media
Correct Ans - to remove taste and odor causing compounds as well as trace
organics
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