Wastewater Grade 4 Exam UPDATED
QUESTIONS AND CORRECT ANSWERS
COD - CORRECT ANSWER Chemical Oxygen Demand
Sensors used in continuous monitoring program should not require frequent ... - CORRECT
ANSWER Calibration to maintain their accuracy
Sulfuric Acid - CORRECT ANSWER H2SO4
Out of pH, suspended solids, BOD, COD, which one can be monitored continuously? -
CORRECT ANSWER pH (temperature as well)
The easiest way to evaluate absorption of organics in a carbon column is to perform ... -
CORRECT ANSWER Analysis of dissolved organics
BOD - CORRECT ANSWER biochemical oxygen demand, amount of dissolved
oxygen needed by aerobic decomposers to break down organic materials
Prior to using a buret for titration, The burette should be rinsed out with - CORRECT
ANSWER Distilled water
POTW - CORRECT ANSWER Publicly Owned Treatment Works
Receiving Waters - CORRECT ANSWER all distinct bodies of water that receive
runoff such as streams, lakes and rivers from a POTW
Sodium hypochlorite is used as a - CORRECT ANSWER Liquid
,Suspended Solids (SS) - CORRECT ANSWER Anything that settles to the bottom of
the receiving water and smothers living things
Oils and Grease (O&G) - CORRECT ANSWER Anything that will float on top of
receiving and prevents oxygen from being added
Total solids = suspended solids & WHAT? solids. - CORRECT ANSWER Dissolved
Grease entering a waste water treatment plant is removed by - CORRECT
ANSWER Skimming
Biochemical Oxygen Demand (BOD) - CORRECT ANSWER Anything that consumes
oxygen preventing fish etc. from getting oxygen they need
No industrial facility shall discharge to a POTW a waste stream with a pH lower than -
CORRECT ANSWER 5.5
Suspended Solids are removed by - CORRECT ANSWER Settling
Oils and Grease are removed by - CORRECT ANSWER Skimming
To determine the amount of organic material present in an industrial waste stream you would
use - CORRECT ANSWER A BOD test
BOD is removed by - CORRECT ANSWER Aeration and microorganisms
Valves used to open or close only are - CORRECT ANSWER Ball valves (small
piping)
Gate valves (large piping)
,Along with the SS, O&G and BOD POTWs also prohibit the discharge of - CORRECT
ANSWER 1. Anything creating fire/explosion hazard
- worker safety
2. Anything with pH below 5.0
- acidic water dissolves concrete piping and tanks
3. Anything that obstructs flow or is a solid. - clogs piping and restricts flow
4. Anything above 104 F
- kills organisms and bacteria
5. Anything creates toxic gas
- worker safety
6. No priority pollutants Toxic Organics TTO's
- kills organisms and bacteria
7. No heavy metals
- kills organisms and bacteria and contaminates settled solids
Biomass or biosolids - CORRECT ANSWER A clump of organic material consisting
of living organisms feeding on wastes and other debris
Pulp and Paper Industry - CORRECT ANSWER High BOD, COD and suspended
solids
Mesh equals the number of holes - CORRECT ANSWER Per inch
Battery Manufacturing - CORRECT ANSWER Lead and Acids
Slurry - CORRECT ANSWER The suspension of water and another solid material that
does not dissolve i.e. lime slurry
Petroleum Industry - CORRECT ANSWER High suspended solids, dissolved solids
and oils
, Gate valves are most commonly used for - CORRECT ANSWER Lime slurries
Blinding - CORRECT ANSWER When a screen type filter clogged because all it's
pores are plugged up
Turbidity - CORRECT ANSWER Measurement of the cloudiness of a water stream.
Typically, this is due to suspended or colloidal solids and they won't settle because they are so
small
Iron and Steel Industry - CORRECT ANSWER Toxic organics, dissolved salts, oils,
acids and solvents
Volatile - CORRECT ANSWER A substance i.e. methanol gasoline that can be
evaporated at a relatively low temperature
Dairy Industry - CORRECT ANSWER High BOD and suspended solids
Plastics Industry - CORRECT ANSWER High Temperatures, oils and coolants
Because lime slurries need to be vigorously agitated or the lime will settle out and clog
everything, there's only on type of pump used - CORRECT ANSWER Centrifugal
Tanning Industry - CORRECT ANSWER High salts, high BOD, suspended solids
Meat Packing Industry - CORRECT ANSWER High BOD and suspended solids
Air stripping - CORRECT ANSWER The removal of volatile organic compounds
(VOCs) from a water stream by evaporating them and adding them to air
QUESTIONS AND CORRECT ANSWERS
COD - CORRECT ANSWER Chemical Oxygen Demand
Sensors used in continuous monitoring program should not require frequent ... - CORRECT
ANSWER Calibration to maintain their accuracy
Sulfuric Acid - CORRECT ANSWER H2SO4
Out of pH, suspended solids, BOD, COD, which one can be monitored continuously? -
CORRECT ANSWER pH (temperature as well)
The easiest way to evaluate absorption of organics in a carbon column is to perform ... -
CORRECT ANSWER Analysis of dissolved organics
BOD - CORRECT ANSWER biochemical oxygen demand, amount of dissolved
oxygen needed by aerobic decomposers to break down organic materials
Prior to using a buret for titration, The burette should be rinsed out with - CORRECT
ANSWER Distilled water
POTW - CORRECT ANSWER Publicly Owned Treatment Works
Receiving Waters - CORRECT ANSWER all distinct bodies of water that receive
runoff such as streams, lakes and rivers from a POTW
Sodium hypochlorite is used as a - CORRECT ANSWER Liquid
,Suspended Solids (SS) - CORRECT ANSWER Anything that settles to the bottom of
the receiving water and smothers living things
Oils and Grease (O&G) - CORRECT ANSWER Anything that will float on top of
receiving and prevents oxygen from being added
Total solids = suspended solids & WHAT? solids. - CORRECT ANSWER Dissolved
Grease entering a waste water treatment plant is removed by - CORRECT
ANSWER Skimming
Biochemical Oxygen Demand (BOD) - CORRECT ANSWER Anything that consumes
oxygen preventing fish etc. from getting oxygen they need
No industrial facility shall discharge to a POTW a waste stream with a pH lower than -
CORRECT ANSWER 5.5
Suspended Solids are removed by - CORRECT ANSWER Settling
Oils and Grease are removed by - CORRECT ANSWER Skimming
To determine the amount of organic material present in an industrial waste stream you would
use - CORRECT ANSWER A BOD test
BOD is removed by - CORRECT ANSWER Aeration and microorganisms
Valves used to open or close only are - CORRECT ANSWER Ball valves (small
piping)
Gate valves (large piping)
,Along with the SS, O&G and BOD POTWs also prohibit the discharge of - CORRECT
ANSWER 1. Anything creating fire/explosion hazard
- worker safety
2. Anything with pH below 5.0
- acidic water dissolves concrete piping and tanks
3. Anything that obstructs flow or is a solid. - clogs piping and restricts flow
4. Anything above 104 F
- kills organisms and bacteria
5. Anything creates toxic gas
- worker safety
6. No priority pollutants Toxic Organics TTO's
- kills organisms and bacteria
7. No heavy metals
- kills organisms and bacteria and contaminates settled solids
Biomass or biosolids - CORRECT ANSWER A clump of organic material consisting
of living organisms feeding on wastes and other debris
Pulp and Paper Industry - CORRECT ANSWER High BOD, COD and suspended
solids
Mesh equals the number of holes - CORRECT ANSWER Per inch
Battery Manufacturing - CORRECT ANSWER Lead and Acids
Slurry - CORRECT ANSWER The suspension of water and another solid material that
does not dissolve i.e. lime slurry
Petroleum Industry - CORRECT ANSWER High suspended solids, dissolved solids
and oils
, Gate valves are most commonly used for - CORRECT ANSWER Lime slurries
Blinding - CORRECT ANSWER When a screen type filter clogged because all it's
pores are plugged up
Turbidity - CORRECT ANSWER Measurement of the cloudiness of a water stream.
Typically, this is due to suspended or colloidal solids and they won't settle because they are so
small
Iron and Steel Industry - CORRECT ANSWER Toxic organics, dissolved salts, oils,
acids and solvents
Volatile - CORRECT ANSWER A substance i.e. methanol gasoline that can be
evaporated at a relatively low temperature
Dairy Industry - CORRECT ANSWER High BOD and suspended solids
Plastics Industry - CORRECT ANSWER High Temperatures, oils and coolants
Because lime slurries need to be vigorously agitated or the lime will settle out and clog
everything, there's only on type of pump used - CORRECT ANSWER Centrifugal
Tanning Industry - CORRECT ANSWER High salts, high BOD, suspended solids
Meat Packing Industry - CORRECT ANSWER High BOD and suspended solids
Air stripping - CORRECT ANSWER The removal of volatile organic compounds
(VOCs) from a water stream by evaporating them and adding them to air
