WASTEWATER CLASS B TEXAS 2026 TEST PAPER
QUESTIONS AND ANSWERS GRADED A+
✔✔Secondary treatment typically used today would include - ✔✔Stabilization ponds,
trickling filters, rotating biological contractors (RBC) & activated sludge
✔✔Essential components of the wastewater collection system include - ✔✔Sewer
mains & piping, Lift Stations, Pumps, Grease & Sand traps, & Manholes
✔✔Grit removal would be considered - ✔✔A part of Primary Treatment
✔✔The protozoa that causes dysentery would most likely be destroyed by -
✔✔Disinfection
✔✔Using final plant effluent in cooling towers would be a - ✔✔Beneficial way to reuse
treated effluent
✔✔TCEQ may authorize discharge of untreated wastewater into or near a receiving
stream in extreme cases. This is referred to as - ✔✔Bypass
✔✔Enforcement action from TCEQ may be taken if pollution or waste violates the
Texas Water Code. Violations of Water Code may include - ✔✔Unauthorized discharge,
accidental discharge & health hazard
✔✔Solids in wastewater are classified as - ✔✔Total (TR), Suspended (TSS), Dissolved
(TDS), Settleable (SS), Non-setteable, Floatable, Organic and Inorganic
✔✔Total Suspended Solids (TSS) are those that - ✔✔Can be filtered out
✔✔Total Dissolved Solids (TDS) are those that - ✔✔cannot be filtered out
✔✔Settable Solids (SS) are those that - ✔✔Settle out when left standing for extended
periods of time
✔✔Non-settleable Solids are - ✔✔Small particles that do not settle
✔✔Volatile Solids (VSS) are those that - ✔✔Are determined by burning the residue from
the Total Solids determination
✔✔Inorganic Solids (ash) are those that - ✔✔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 - ✔✔Dissolved or Suspended / 65
✔✔The typical pH of an influent entering the plant will vary from - ✔✔6.5 to 8.0
✔✔Acute toxicity occurs when - ✔✔There is a rapid die off of treatment organisms
✔✔Chronic toxicity occurs when - ✔✔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 -
✔✔Cumminuter
✔✔Detention time in wastewater typically refers to - ✔✔The time sewage is kept in a
sedimentation basis
✔✔There are five (5) major components to a trickling filter - ✔✔Filter floor, underdrain,
walls, filter media, & distributer arms
✔✔Zoogleal Mass refers to - ✔✔A thick layer of jelly like slime where organisms
bacteria, fungi, protozoa and ciliates thrive.
✔✔The efficiency of a trickling filter is measured in - ✔✔Percent BOD Removed
✔✔Common operating problems with a trickling filter include - ✔✔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 - ✔✔35 lbs BOD/Acre/Day with a
minimum of 30 days detention time
✔✔Wastewater Stabilization Ponds work through a complex process which includes -
✔✔Sunlight, Oxygen, Nutrients, Algae, and Bacteria
✔✔Facultative Lagoons have two zones of treatment - ✔✔an aerobic surface layer and
an anaerobic bottom layer
✔✔Typically one could expect ____ % BOD removal in a Facultative Lagoon - ✔✔50
✔✔Aerated Lagoons rely on ______ to provide ____and _____ - ✔✔Mechanical
aeration/ Aeration & mixing
✔✔The most common method of dewatering and drying sludge is - ✔✔drying bed
QUESTIONS AND ANSWERS GRADED A+
✔✔Secondary treatment typically used today would include - ✔✔Stabilization ponds,
trickling filters, rotating biological contractors (RBC) & activated sludge
✔✔Essential components of the wastewater collection system include - ✔✔Sewer
mains & piping, Lift Stations, Pumps, Grease & Sand traps, & Manholes
✔✔Grit removal would be considered - ✔✔A part of Primary Treatment
✔✔The protozoa that causes dysentery would most likely be destroyed by -
✔✔Disinfection
✔✔Using final plant effluent in cooling towers would be a - ✔✔Beneficial way to reuse
treated effluent
✔✔TCEQ may authorize discharge of untreated wastewater into or near a receiving
stream in extreme cases. This is referred to as - ✔✔Bypass
✔✔Enforcement action from TCEQ may be taken if pollution or waste violates the
Texas Water Code. Violations of Water Code may include - ✔✔Unauthorized discharge,
accidental discharge & health hazard
✔✔Solids in wastewater are classified as - ✔✔Total (TR), Suspended (TSS), Dissolved
(TDS), Settleable (SS), Non-setteable, Floatable, Organic and Inorganic
✔✔Total Suspended Solids (TSS) are those that - ✔✔Can be filtered out
✔✔Total Dissolved Solids (TDS) are those that - ✔✔cannot be filtered out
✔✔Settable Solids (SS) are those that - ✔✔Settle out when left standing for extended
periods of time
✔✔Non-settleable Solids are - ✔✔Small particles that do not settle
✔✔Volatile Solids (VSS) are those that - ✔✔Are determined by burning the residue from
the Total Solids determination
✔✔Inorganic Solids (ash) are those that - ✔✔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 - ✔✔Dissolved or Suspended / 65
✔✔The typical pH of an influent entering the plant will vary from - ✔✔6.5 to 8.0
✔✔Acute toxicity occurs when - ✔✔There is a rapid die off of treatment organisms
✔✔Chronic toxicity occurs when - ✔✔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 -
✔✔Cumminuter
✔✔Detention time in wastewater typically refers to - ✔✔The time sewage is kept in a
sedimentation basis
✔✔There are five (5) major components to a trickling filter - ✔✔Filter floor, underdrain,
walls, filter media, & distributer arms
✔✔Zoogleal Mass refers to - ✔✔A thick layer of jelly like slime where organisms
bacteria, fungi, protozoa and ciliates thrive.
✔✔The efficiency of a trickling filter is measured in - ✔✔Percent BOD Removed
✔✔Common operating problems with a trickling filter include - ✔✔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 - ✔✔35 lbs BOD/Acre/Day with a
minimum of 30 days detention time
✔✔Wastewater Stabilization Ponds work through a complex process which includes -
✔✔Sunlight, Oxygen, Nutrients, Algae, and Bacteria
✔✔Facultative Lagoons have two zones of treatment - ✔✔an aerobic surface layer and
an anaerobic bottom layer
✔✔Typically one could expect ____ % BOD removal in a Facultative Lagoon - ✔✔50
✔✔Aerated Lagoons rely on ______ to provide ____and _____ - ✔✔Mechanical
aeration/ Aeration & mixing
✔✔The most common method of dewatering and drying sludge is - ✔✔drying bed
