Wastewater Grade 4 questions well
answered already passed
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
answered already passed
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
