WATER TREATMENT GRADE 4
EXAM
which treatment technique is the best to prevent lead
contamination
corrosion control
when doing lead and copper sampling the customer usually takes
the sample the next morning as
first draw sample from the cold water slide
how long should water set undisturbed before collecting a lead
and copper sample
6 hours minimum 12 hours max
a mixed media sand filter will usually contain
gravel, sand, and anthracite
autoclaving is the sterilization of glassware at
121 degrees c at 15 psi
a bad leak on a chlorinator exists, it can best be found by
putting on a scba then find leak using ammonia fumes
chlorine dioxide must be generate on site it gives off the by
products of
chlorate and chlorite
what needs to be installed on the bottom of a pipe when the pump
is above water
foot valve
,a leak has been found on a 150 pound cylinder before attempting
to repair the leak is to
roll unit until leak is on top
a utility plans to feed fluoride to protect children's teeth. if
accidentally over fed the result could be
mottling
a person drinking water with high fluoride levels for years may
have
brittle bone disease
what is the purpose of a wear ring in a centrifugal pump
to help protect expensive pump parts and direct flow
what piece of lab glassware will most accurately measure 100
MLS of water
volumetric flask
when speaking of corrosion control a glassy phosphate is used to
protect the pipes from corrosion and scaling the downside is
phosphate is used by bacteria to grow
if a sample comes back ECP (E-Coli Positive) the utility would
first
issue a boil water alert immediatly with signs through TV radio and
newspaper
what happens to the setting rate of particles when the temp is
colde
it slows down
what is the purpose of a surge tank
absorb a water hammer
,what is the purpose of a greensand filter and in what position will
it sit
to remove hydrogen sulfide gas and sit above anthracite. greensand
oxidizes iron and manganese and can be regenerated
crypto is a very real danger to customers I'd these cysts get into
the distribution system. they are only found in surface water and
can be very hard to kill with chlorine because
they form a slime layer around themselves when water temps drop
a fire main for a hotel is being installed this flow will have an in
line meter the best meter to use isthe
proportional meter
filtration will not remove all impurities from the water
true
a water plant operator notices a dramatic spike In turbidity levels
after checking the visual water clarity he notices a reddish color
in the water. what action should be done first
shut the plant off
when speaking of colonies the colonies in water treatment we are
looking for are
bacterial
when taking a coliform sample why do we allow the water to run
for a few minutes before taking chlorine residual
allow fresh water to get from the main to there
what is the definition of a clear well
it holds filtered water and allows for fairly constant filtration rates
chlorine is harmful to fish
, true
what effect does blue baby syndrome have on an unborn child
nitrates limit oxygen transfer
Anabaena bacteria (blue green algae) can cause illness in people
and animals due to the reasons of toxins. they were once mistaken
for algae they are more numerous in
nutrient rich reservoirs
why is a rapid sand filter back washed at a lower rate in the
beginning
to purge the filter of air
during coagulation with aluminum sulfate the proper pH range
will need to be found for the best coagulation. the perfect pH is
known as the
isoelectic point
a sedimentation basin has rising gas bubbles the bubbles are
nitrogen gas
Pac will not remove flouride ions
true
the main advantage of using UV lights vs chlorination
UV light has a much shorter need of contact time with the
microorganisms.
lead mcl
.015
Copper MCL
1.3
EXAM
which treatment technique is the best to prevent lead
contamination
corrosion control
when doing lead and copper sampling the customer usually takes
the sample the next morning as
first draw sample from the cold water slide
how long should water set undisturbed before collecting a lead
and copper sample
6 hours minimum 12 hours max
a mixed media sand filter will usually contain
gravel, sand, and anthracite
autoclaving is the sterilization of glassware at
121 degrees c at 15 psi
a bad leak on a chlorinator exists, it can best be found by
putting on a scba then find leak using ammonia fumes
chlorine dioxide must be generate on site it gives off the by
products of
chlorate and chlorite
what needs to be installed on the bottom of a pipe when the pump
is above water
foot valve
,a leak has been found on a 150 pound cylinder before attempting
to repair the leak is to
roll unit until leak is on top
a utility plans to feed fluoride to protect children's teeth. if
accidentally over fed the result could be
mottling
a person drinking water with high fluoride levels for years may
have
brittle bone disease
what is the purpose of a wear ring in a centrifugal pump
to help protect expensive pump parts and direct flow
what piece of lab glassware will most accurately measure 100
MLS of water
volumetric flask
when speaking of corrosion control a glassy phosphate is used to
protect the pipes from corrosion and scaling the downside is
phosphate is used by bacteria to grow
if a sample comes back ECP (E-Coli Positive) the utility would
first
issue a boil water alert immediatly with signs through TV radio and
newspaper
what happens to the setting rate of particles when the temp is
colde
it slows down
what is the purpose of a surge tank
absorb a water hammer
,what is the purpose of a greensand filter and in what position will
it sit
to remove hydrogen sulfide gas and sit above anthracite. greensand
oxidizes iron and manganese and can be regenerated
crypto is a very real danger to customers I'd these cysts get into
the distribution system. they are only found in surface water and
can be very hard to kill with chlorine because
they form a slime layer around themselves when water temps drop
a fire main for a hotel is being installed this flow will have an in
line meter the best meter to use isthe
proportional meter
filtration will not remove all impurities from the water
true
a water plant operator notices a dramatic spike In turbidity levels
after checking the visual water clarity he notices a reddish color
in the water. what action should be done first
shut the plant off
when speaking of colonies the colonies in water treatment we are
looking for are
bacterial
when taking a coliform sample why do we allow the water to run
for a few minutes before taking chlorine residual
allow fresh water to get from the main to there
what is the definition of a clear well
it holds filtered water and allows for fairly constant filtration rates
chlorine is harmful to fish
, true
what effect does blue baby syndrome have on an unborn child
nitrates limit oxygen transfer
Anabaena bacteria (blue green algae) can cause illness in people
and animals due to the reasons of toxins. they were once mistaken
for algae they are more numerous in
nutrient rich reservoirs
why is a rapid sand filter back washed at a lower rate in the
beginning
to purge the filter of air
during coagulation with aluminum sulfate the proper pH range
will need to be found for the best coagulation. the perfect pH is
known as the
isoelectic point
a sedimentation basin has rising gas bubbles the bubbles are
nitrogen gas
Pac will not remove flouride ions
true
the main advantage of using UV lights vs chlorination
UV light has a much shorter need of contact time with the
microorganisms.
lead mcl
.015
Copper MCL
1.3
