Grade 3 Wastewater Practice Questions with Verified Answers| Latest Update Graded A+
metals plastics elastomers the ozone is extremely reactive. which of the following materials
will it readily corrode?
seeded a BOD sample is collected after UV disinfection. To get an accurate result, the BOD
bottle must be:
positive displacement pumps what type of pump adds energy to the fluid intermittently?
reduce the aeration rates if a small package treatment plant utilizing the activated sludge
process has a light-colored floating sludge on the surface of the clarifier, which one of the
following would be most likely eliminate the floating sludge?
a white filamentous growth on the rotating biological contactor (RBC) media is indicative of
septic wastewater & high H25
a white mat (filamentous growth) on a RBC is due to sulfate compounds in the wastewater. Due
to a lack of O2 (septicity) sulfates are reduced to hydrogen sulfite gas.
inadequate sludge pumping you observe an excessive D.O. drop across a primary clarifier
the probable cause is?
at the influent end and influent BOD for the modified Ludzack-Ettinger process the anoxic
zone is located ______ and USIS ______ as the carbon source
alkalinity consumption addition of iron salts for phosphorus removal results in?
phosphate alum (aluminum sulfate) might be added to wastewater to cause a reduction in
the concentration of:
F/M ratio is too ow
,rotifiers are an older bug when looking through a microscope an operator sees the presence
of nematodes & a predominance of rotifiers from sample collected from the activated sludge
plant.
what is the most likely cause?
unloading of the trickling filter means? the filter growth has sloughed off the filter & washed
to the secondary clarifier
7.2 lbs to 1 lb
and replenishes it at a rate of 3.6 lbs of alkalinity to 1 lb of nitrate how much alk is required
to convert 1.0 lbs of ammonia-nitrogen during the nitraction process
to maintain a constant temp or even temp why is the fecal coliform stored in a water bath?
acid bath UV light bulbs may be cleaned in a?
solarization which mean the quartz sleeve has reached its life and reduce the UV transmission
discoloration on the quartz sleeve of a UV system is called what
UV life expectancy 7,500 hours to 20,000 hours
dose dose= demand + residual
demand = dose - residual
cationic polymer is positive change
class B 2,000,000 per gram
, class A no more than 1,000 per gram what is the fecal coliform limit to meet standard for
class B & A biosolids?
destroys the cell ability to reproduce what does UV radiation do to the cell wall of an
organism?
sodium hydroxide. the addition of caustic to a bed of activated carbon elevates the pH to about
12 to absorb H25 from media which chem is typically used to regenerate the carbon of an
activated carbon odor control system
conventional aeration what type of activated sludge process has an F/M ratio of about 0.2
to 0.5 an SRT of about 5 days to 15 days?
8 inch water column but some are designed for a pressure of 25 inches or more fixed
covered digester both flat, conical covers are designed to maintain no more than an _________
water column
aluminum and iron the two main metal salts used in phosphorus removal are?
oxygen uptake rate (OUR) what bacterial activity measurement is expressed as Mg/L/Hr
ortho-phosphate what type of phosphorus is soluble and not particulate?
A= 150 lb cylinder
B= 1 ton
C= tank and cars which repair kit is used for 150 lb cynlinder of chlorine
3,960 33,000 ft/lb divided by 8.33 (the weight in lbs of one gallon of water
metals plastics elastomers the ozone is extremely reactive. which of the following materials
will it readily corrode?
seeded a BOD sample is collected after UV disinfection. To get an accurate result, the BOD
bottle must be:
positive displacement pumps what type of pump adds energy to the fluid intermittently?
reduce the aeration rates if a small package treatment plant utilizing the activated sludge
process has a light-colored floating sludge on the surface of the clarifier, which one of the
following would be most likely eliminate the floating sludge?
a white filamentous growth on the rotating biological contactor (RBC) media is indicative of
septic wastewater & high H25
a white mat (filamentous growth) on a RBC is due to sulfate compounds in the wastewater. Due
to a lack of O2 (septicity) sulfates are reduced to hydrogen sulfite gas.
inadequate sludge pumping you observe an excessive D.O. drop across a primary clarifier
the probable cause is?
at the influent end and influent BOD for the modified Ludzack-Ettinger process the anoxic
zone is located ______ and USIS ______ as the carbon source
alkalinity consumption addition of iron salts for phosphorus removal results in?
phosphate alum (aluminum sulfate) might be added to wastewater to cause a reduction in
the concentration of:
F/M ratio is too ow
,rotifiers are an older bug when looking through a microscope an operator sees the presence
of nematodes & a predominance of rotifiers from sample collected from the activated sludge
plant.
what is the most likely cause?
unloading of the trickling filter means? the filter growth has sloughed off the filter & washed
to the secondary clarifier
7.2 lbs to 1 lb
and replenishes it at a rate of 3.6 lbs of alkalinity to 1 lb of nitrate how much alk is required
to convert 1.0 lbs of ammonia-nitrogen during the nitraction process
to maintain a constant temp or even temp why is the fecal coliform stored in a water bath?
acid bath UV light bulbs may be cleaned in a?
solarization which mean the quartz sleeve has reached its life and reduce the UV transmission
discoloration on the quartz sleeve of a UV system is called what
UV life expectancy 7,500 hours to 20,000 hours
dose dose= demand + residual
demand = dose - residual
cationic polymer is positive change
class B 2,000,000 per gram
, class A no more than 1,000 per gram what is the fecal coliform limit to meet standard for
class B & A biosolids?
destroys the cell ability to reproduce what does UV radiation do to the cell wall of an
organism?
sodium hydroxide. the addition of caustic to a bed of activated carbon elevates the pH to about
12 to absorb H25 from media which chem is typically used to regenerate the carbon of an
activated carbon odor control system
conventional aeration what type of activated sludge process has an F/M ratio of about 0.2
to 0.5 an SRT of about 5 days to 15 days?
8 inch water column but some are designed for a pressure of 25 inches or more fixed
covered digester both flat, conical covers are designed to maintain no more than an _________
water column
aluminum and iron the two main metal salts used in phosphorus removal are?
oxygen uptake rate (OUR) what bacterial activity measurement is expressed as Mg/L/Hr
ortho-phosphate what type of phosphorus is soluble and not particulate?
A= 150 lb cylinder
B= 1 ton
C= tank and cars which repair kit is used for 150 lb cynlinder of chlorine
3,960 33,000 ft/lb divided by 8.33 (the weight in lbs of one gallon of water
