TEXAS WASTEWATER CLASS A
CERTIFICATION REVIEW 2026 TESTED
ANSWERS GRADED A+
⩥ Inorganic Solids (ash) are those that.
Answer: Consist of sand, grit, & minerals and
can be suspended or dissolved
⩥ Organic matter in wastewater can be ______or________and
makes up approximately _______% of the total solids.
Answer: Dissolved or Suspended / 65
⩥ The typical pH of an influent entering the plant will vary from.
Answer: 6.5 to 8.0
⩥ Acute toxicity occurs when.
Answer: There is a rapid die off of treatment organisms
⩥ Chronic toxicity occurs when.
Answer: Certain microorganisms become inactivated but others
continue to work resulting in a sick biological process
,⩥ A mechanical device that screens & cuts large solids in small particles.
Answer: Comminutors
⩥ Detention time in wastewater typically refers to.
Answer: The time sewage is kept in a sedimentation basis
⩥ There are five (5) major components to a trickling filter.
Answer: Filter floor, underdrain, walls, filter media, & distributer arms
⩥ Zoogleal Mass refers to.
Answer: A thick layer of jelly like slime where
organisms bacteria, fungi,
protozoa and ciliates thrive.
⩥ The efficiency of a trickling filter is measured in.
Answer: Percent BOD Removed
⩥ Common operating problems with a trickling filter include.
Answer: Ponding, Filter files, Odors, Clogging of Nozzles, & Snails
⩥ Wastewater Stabilization Ponds are an approved process
, for wastewater treatment. Organic loading of
Stabilization Ponds is typically.
Answer: 35 lbs BOD/Acre/Day with a minimum
of 30 days detention time
⩥ Wastewater Stabilization Ponds work through a
complex process which includes.
Answer: Sunlight, Oxygen, Nutrients, Algae, and Bacteria
⩥ Facultative Lagoons have two zones of treatment.
Answer: an aerobic surface layer and an anaerobic bottom layer
⩥ Typically one could expect ____ % BOD removal in a Facultative
Lagoon.
Answer: 50
⩥ Aerated Lagoons rely on ______ to provide ____and _____.
Answer: Mechanical aeration/ Aeration & mixing
⩥ The most common method of dewatering and drying sludge is.
Answer: drying bed
CERTIFICATION REVIEW 2026 TESTED
ANSWERS GRADED A+
⩥ Inorganic Solids (ash) are those that.
Answer: Consist of sand, grit, & minerals and
can be suspended or dissolved
⩥ Organic matter in wastewater can be ______or________and
makes up approximately _______% of the total solids.
Answer: Dissolved or Suspended / 65
⩥ The typical pH of an influent entering the plant will vary from.
Answer: 6.5 to 8.0
⩥ Acute toxicity occurs when.
Answer: There is a rapid die off of treatment organisms
⩥ Chronic toxicity occurs when.
Answer: Certain microorganisms become inactivated but others
continue to work resulting in a sick biological process
,⩥ A mechanical device that screens & cuts large solids in small particles.
Answer: Comminutors
⩥ Detention time in wastewater typically refers to.
Answer: The time sewage is kept in a sedimentation basis
⩥ There are five (5) major components to a trickling filter.
Answer: Filter floor, underdrain, walls, filter media, & distributer arms
⩥ Zoogleal Mass refers to.
Answer: A thick layer of jelly like slime where
organisms bacteria, fungi,
protozoa and ciliates thrive.
⩥ The efficiency of a trickling filter is measured in.
Answer: Percent BOD Removed
⩥ Common operating problems with a trickling filter include.
Answer: Ponding, Filter files, Odors, Clogging of Nozzles, & Snails
⩥ Wastewater Stabilization Ponds are an approved process
, for wastewater treatment. Organic loading of
Stabilization Ponds is typically.
Answer: 35 lbs BOD/Acre/Day with a minimum
of 30 days detention time
⩥ Wastewater Stabilization Ponds work through a
complex process which includes.
Answer: Sunlight, Oxygen, Nutrients, Algae, and Bacteria
⩥ Facultative Lagoons have two zones of treatment.
Answer: an aerobic surface layer and an anaerobic bottom layer
⩥ Typically one could expect ____ % BOD removal in a Facultative
Lagoon.
Answer: 50
⩥ Aerated Lagoons rely on ______ to provide ____and _____.
Answer: Mechanical aeration/ Aeration & mixing
⩥ The most common method of dewatering and drying sludge is.
Answer: drying bed
