Water Treatment Grade 4 exam prep
which disinfectant would work best against Cryptosporidium
Ozone
The pH of a Water sample Is greater than the PHs so the Langlier index
indicates the water is scale forming
When water high in calcium bicarbonate is softened by ion exchange
Sodium Bicarbonate ...
Water Treatment Grade 4 exam prep
which disinfectant would work best against Cryptosporidium
Ozone
The pH of a Water sample Is greater than the PHs so the Langlier index
indicates the water is scale forming
When water high in calcium bicarbonate is softened by ion exchange
Sodium Bicarbonate remains in the product water
A bypass valve would be used with a
gate valve
Where ground frost is expected the riser pipes in a meter pit should be atleast how far away from any
wall of the meter box to prevent freezing
1-2 inches
which type of pipe joint is available in both bolted and bolt less flexible pipe joint designs
Ball and Socket Joint
which type of pipe joint permits flexible pipe alignment is inexpensive to manufacture and is easy to
assemble
push on joint
new polyvinyl chloride pipe has a c-value of about
150+
which type of valve would be particularly useful for throttling the flow of corrosive liquids
pinch valve
Water meter pits are usually used in
cold climates
fuel oil will permeate which type of pipe
polyethylene pipe
An ion exchange softener is treating a flow rate of 125 gpm. what is the operating time in hours if the
softener unit treats 297000 gallons before it requires regeneration?
39.6 hr
00:0101:28
, in describing pump operation what type of curve shows the relationship between power and capacity
P-Q curve
What is Head Loss
energy used by water when moving from point to point
Static Suction Lift
Difference in water placement
What is Power
Work done in a given time
if a water system collects at least 40 samples per month for the analyses of total coliforms, what
percentage of total coliform samples are acceptable for the system to remain in compliance with the
maximum contaminant level for total coliforms
no more than 5%
water systems are required to achieve at least________ removal and or inactivation of viruses between
a point where the raw water is not subject to recontamination by surface water runoff and a point
downstream before or at the first customer.
4 log
where are the sampling points located for required samplings of organics (except THMs) in a community
water system
entry points to the distribution system
where are the sampling points located for required sampling of natural radionuclides in a community
water system
each entry point to the system
continuous chlorine residual monitoring is required where the water enters the distribution system
under the SWTR when the
population served is >3300 people.
a community water system must post the consumer confidence report on a publicly accessible website if
it serves more than
100000 people
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