WASTEWATER TREATMENT
OPERATOR EXAMINATION REVIEW
TESTED QUESTIONS ACCURATE
SOLUTIONS
⩥ acid. Answer: A substance that increases the hydrogen ion
concentration of a solution.
lowers PH
corrosive
⩥ activated sludge. Answer: produced in raw or settled wastewater by
the growth of bacteria, in the presence of dissolved oxygen.
⩥ activated sludge process. Answer: A biological wastewater treatment
process which speeds up the decomposition of wastes in the wastewater
being treated. Activated Sludge is added to wastewater and the mixture
(mixed liquor) is aerated and agitated. After some time in the aeration
tank, the activated sludge is allowed to settle out by sedimentation and is
disposed of (wasted) or reused (returned to the aeration tank) as needed,
the remaining wastewater then undergoes more treatment.
,⩥ adsorption. Answer: The process of binding or sticking to a surface.
⩥ advanced waste treatment. Answer: Any process of water renovation
that upgrades treated wastewater to meet specific reuse requirements.
⩥ aeration. Answer: the process by which air is circulated through,
mixed with or dissolved in a liquid or substance.
⩥ aerobes. Answer: Bacteria that require oxygen to grow
⩥ aerobic bacteria. Answer: bacteria that use oxygen for cellular
respiration
⩥ air lift. Answer: type of pump, air injected at the bottom to lift water
to the top, like percolator coffee pot
⩥ algae. Answer: microscopic plants. live in or on water or on structures
near water, make o2 during day, use o2 at night, affect PH and DO
⩥ aliquot. Answer: A portion of a well-mixed sample removed for
testing
⩥ alkalinity. Answer: ability of water to buffer acids
,⩥ anaerobic. Answer: Process that does not require oxygen
⩥ anaerobic bacteria. Answer: bacteria that do not require oxygen to
survive
⩥ anaerobic digestion. Answer: is the decomposition of waste under
anaerobic conditions to produce biogas and a compost-like residue
⩥ anoxic. Answer: oxygen deficient less than .5 ppm
⩥ bacteria. Answer: (microbiology) single-celled or noncellular
spherical or spiral or rod-shaped organisms lacking chlorophyll that
reproduce by fission
⩥ baffle. Answer: board used to direct flow, uniform velocities, absorb
energy, divert, guide, agitate liquids
⩥ base. Answer: a compound that produces hydroxide ions in solution.
raises PH
⩥ biomass. Answer: the total mass of organisms in a given area or
volume.
, ⩥ biosolids. Answer: A primarily organic solid product produced by
wastewater treatment processes that can be beneficially recycled. The
word biosolids is replacing the word sludge when referring to treated
waste.
⩥ Biochemical Oxygen Demand (BOD). Answer: A measure of the
amount of dissolved oxygen required to break down the organic material
in a given volume of water through aerobic biological activity
⩥ blank. Answer: sample being tested is not added
⩥ buffer. Answer: A solution that minimizes changes in pH when
extraneous acids or bases are added to the solution.
⩥ bulking. Answer: a condition arising when sludge floats rather than
settles in secondary sewage treatment. can be caused by filamentous
bacteria
⩥ Carbonaceous Biochemical Oxygen Demand (CBOD). Answer: only
the BOD required to remove carbon. based
⩥ cavitation. Answer: formation and collapse of gas bubbles due to low
pressure. can cause pitting. makes noise.
OPERATOR EXAMINATION REVIEW
TESTED QUESTIONS ACCURATE
SOLUTIONS
⩥ acid. Answer: A substance that increases the hydrogen ion
concentration of a solution.
lowers PH
corrosive
⩥ activated sludge. Answer: produced in raw or settled wastewater by
the growth of bacteria, in the presence of dissolved oxygen.
⩥ activated sludge process. Answer: A biological wastewater treatment
process which speeds up the decomposition of wastes in the wastewater
being treated. Activated Sludge is added to wastewater and the mixture
(mixed liquor) is aerated and agitated. After some time in the aeration
tank, the activated sludge is allowed to settle out by sedimentation and is
disposed of (wasted) or reused (returned to the aeration tank) as needed,
the remaining wastewater then undergoes more treatment.
,⩥ adsorption. Answer: The process of binding or sticking to a surface.
⩥ advanced waste treatment. Answer: Any process of water renovation
that upgrades treated wastewater to meet specific reuse requirements.
⩥ aeration. Answer: the process by which air is circulated through,
mixed with or dissolved in a liquid or substance.
⩥ aerobes. Answer: Bacteria that require oxygen to grow
⩥ aerobic bacteria. Answer: bacteria that use oxygen for cellular
respiration
⩥ air lift. Answer: type of pump, air injected at the bottom to lift water
to the top, like percolator coffee pot
⩥ algae. Answer: microscopic plants. live in or on water or on structures
near water, make o2 during day, use o2 at night, affect PH and DO
⩥ aliquot. Answer: A portion of a well-mixed sample removed for
testing
⩥ alkalinity. Answer: ability of water to buffer acids
,⩥ anaerobic. Answer: Process that does not require oxygen
⩥ anaerobic bacteria. Answer: bacteria that do not require oxygen to
survive
⩥ anaerobic digestion. Answer: is the decomposition of waste under
anaerobic conditions to produce biogas and a compost-like residue
⩥ anoxic. Answer: oxygen deficient less than .5 ppm
⩥ bacteria. Answer: (microbiology) single-celled or noncellular
spherical or spiral or rod-shaped organisms lacking chlorophyll that
reproduce by fission
⩥ baffle. Answer: board used to direct flow, uniform velocities, absorb
energy, divert, guide, agitate liquids
⩥ base. Answer: a compound that produces hydroxide ions in solution.
raises PH
⩥ biomass. Answer: the total mass of organisms in a given area or
volume.
, ⩥ biosolids. Answer: A primarily organic solid product produced by
wastewater treatment processes that can be beneficially recycled. The
word biosolids is replacing the word sludge when referring to treated
waste.
⩥ Biochemical Oxygen Demand (BOD). Answer: A measure of the
amount of dissolved oxygen required to break down the organic material
in a given volume of water through aerobic biological activity
⩥ blank. Answer: sample being tested is not added
⩥ buffer. Answer: A solution that minimizes changes in pH when
extraneous acids or bases are added to the solution.
⩥ bulking. Answer: a condition arising when sludge floats rather than
settles in secondary sewage treatment. can be caused by filamentous
bacteria
⩥ Carbonaceous Biochemical Oxygen Demand (CBOD). Answer: only
the BOD required to remove carbon. based
⩥ cavitation. Answer: formation and collapse of gas bubbles due to low
pressure. can cause pitting. makes noise.
