TEXAS WASTE WATER EXAM QUESTIONS AND ACCURATE
ANSWERS| ACTUAL REAL EXAM WITH FREQUENTLY
TESTED QUESTIONS AND STUDY GUIDE |ALREADY A
GRADED|GUARANTEED PASS|LATEST UPDATE 2025.
what two pathogenic bacteria are still present in wastewater after 2 weeks? - CORRECT
ANSWER 1. Thypoid
2. Dysentery
Waste Water Disposal Types? - CORRECT ANSWER 1. Surface Disposal
2. Tile Fields Disposal
3. Subsurface Disposal
4. Dilution Disposal
Why do Disposal Sytes exists? - CORRECT ANSWER Most treatment plants do not treat waste
water beyond secondary treatment stage due to volume and regulation
Must be done before wastewater becomes septic
What are the goals of Waste water disposal types? - CORRECT ANSWER Goal is to keep a
certain level of dissolved oxygen during treatment process so it does not become septic
Surface Disposal site - CORRECT ANSWER Surface disposal pipes drain liquid onto land
straight to land
Tile Fields Disposal site - CORRECT ANSWER underground (shallow) collection of pipes
has tiles divided loosely and evenly in segments to allow water to percolate
Subsurface Disposal site - CORRECT ANSWER leach lines laid 2-5 ft underground used with
septic tank
pipes are perforated (4 in thick) to allow seepage
Dilution Disposal site - CORRECT ANSWER No longer accepted (illegal)
Dispose of wastewater onto a lake, or water body like river, stream
Effluent - CORRECT ANSWER waste water that is being treated
waste water going into treatment plant
liquid waste or sewage discharged into a river or the sea.
,Absorption - CORRECT ANSWER something that is taken into the material (absorbed)
Adsorption - CORRECT ANSWER The process of binding or sticking to a surface.
something that adheres to the material
How much is one gallon of water in lbs? - CORRECT ANSWER 8.34 lbs
How much is one cubic feet (ft3) of water in gal? - CORRECT ANSWER 7.48 gal
What are the waste water treatment steps?* - CORRECT ANSWER 1. Preliminary Treatment
2. Primary Treatment
3. Secondary Treatment
4. Tertiary Treatment
What are the drinking water treatment steps?* - CORRECT ANSWER 1. coagulation
2. Flocculation
3. Sedimentation
4. Filtration
5. Disinfection
*treated water
Preliminary Treatment in waste water - CORRECT ANSWER 1. Bar screening
2. Grit Removal
3. Pre-aeration
4. Flow-meter
5. Chlorine (optional)
Primary Treatment in waste water - CORRECT ANSWER sedimentation aka clarification tanks
- removes solids that can settle and floating debris
- uses coarse debris screens and sand and grit removal
Secondary Treatment in waste water - CORRECT ANSWER collects raw sludge and relocates
for a sludge digestion
-bio and chemical and physical treatment - further removal of solids and disabled solids of waste
water
what is an alternative secondary treatment in waste water? - CORRECT ANSWER Aeration
tanks - to help promote aerobic bacteria to grow which then attracts other bacteria to clump
together and settle for removal knows as "raw sludge",
-held up to 4 hours
,Tertiary Treatment in waste water - CORRECT ANSWER -Filtration of water
-filters to remove particles color and odor
-disinfection - destroys pathogens, bacteria
-tertiary used mainly for reclaimed water
-not done at many large treatment plants
Which waste water treatment is not done in many large treatment plants? - CORRECT
ANSWER Tertiary treatment - bc usually just for reclaimed water
secondary treatment usually enough to dispense into large body of water
After which waste water treatment is it enough to dump treated water into oceans, rivers? -
CORRECT ANSWER after the secondary treatment
What does the preliminary bar screening treatment do? - CORRECT ANSWER removes large
objects , roots, trash, paper, debris
1st line of defense
What does the Grit Removal in preliminary treatment do? - CORRECT ANSWER removes sand
and gravel
also slows down rate of influent water to let the rock, sand settle to bottom
waste water goes through multiple chambers to slow down water
what does the Pre-aeration in preliminary treatment do? - CORRECT ANSWER introduces
oxygen to freshen the waste water
it helps remove oil and scum
What does the flow-meter in preliminary treatment do? - CORRECT ANSWER measures the
rate of flow through out the plant
when is chlorine used in the preliminary treatment of waster water? - CORRECT ANSWER
when wastewater is highly active or reactive
usually optional
what is considered healthy state sludge in waste water treatment?* - CORRECT ANSWER
when digesting sludge by-products gases are at a certain %
, 65% methane
34% carbon Dioxide
< 1 % hydrogen sulfide
what happens in hydrogen sulfide gas increases in the sludge of waste water treatment?* -
CORRECT ANSWER considered a "sick state" sludge
must balance sludge to keep healthy and minimize sulfur odor
What some biological treatments process in secondary treatment? - CORRECT ANSWER 1.
Aerobic treatment
2. Anaerobic treatment
3. Stabilization Pond (lagoonization)
Aerobic treatment process in waster water? - CORRECT ANSWER -activated sludge
-trickling filter
-oxidation ponds
-composting
-subsurface disposal field
-done in secondary treatment
Anaerobic treatment Process in waste water? - CORRECT ANSWER -sludge digestion
-methan productions
-septic tanks
-composting
-done in secondary treatment
Stabilization Pond - CORRECT ANSWER -also called Lagoonization
-holds volume of water for a period of time at shallow depth (3-5 ft)
-to promote aerobic activity and purify the water
-remains for 45-60 days before use
done in secondary treatment
What is sludge? - CORRECT ANSWER solid portion of waste water
3 types
How many types of sludge are there? name them - CORRECT ANSWER 1. Raw Sludge
ANSWERS| ACTUAL REAL EXAM WITH FREQUENTLY
TESTED QUESTIONS AND STUDY GUIDE |ALREADY A
GRADED|GUARANTEED PASS|LATEST UPDATE 2025.
what two pathogenic bacteria are still present in wastewater after 2 weeks? - CORRECT
ANSWER 1. Thypoid
2. Dysentery
Waste Water Disposal Types? - CORRECT ANSWER 1. Surface Disposal
2. Tile Fields Disposal
3. Subsurface Disposal
4. Dilution Disposal
Why do Disposal Sytes exists? - CORRECT ANSWER Most treatment plants do not treat waste
water beyond secondary treatment stage due to volume and regulation
Must be done before wastewater becomes septic
What are the goals of Waste water disposal types? - CORRECT ANSWER Goal is to keep a
certain level of dissolved oxygen during treatment process so it does not become septic
Surface Disposal site - CORRECT ANSWER Surface disposal pipes drain liquid onto land
straight to land
Tile Fields Disposal site - CORRECT ANSWER underground (shallow) collection of pipes
has tiles divided loosely and evenly in segments to allow water to percolate
Subsurface Disposal site - CORRECT ANSWER leach lines laid 2-5 ft underground used with
septic tank
pipes are perforated (4 in thick) to allow seepage
Dilution Disposal site - CORRECT ANSWER No longer accepted (illegal)
Dispose of wastewater onto a lake, or water body like river, stream
Effluent - CORRECT ANSWER waste water that is being treated
waste water going into treatment plant
liquid waste or sewage discharged into a river or the sea.
,Absorption - CORRECT ANSWER something that is taken into the material (absorbed)
Adsorption - CORRECT ANSWER The process of binding or sticking to a surface.
something that adheres to the material
How much is one gallon of water in lbs? - CORRECT ANSWER 8.34 lbs
How much is one cubic feet (ft3) of water in gal? - CORRECT ANSWER 7.48 gal
What are the waste water treatment steps?* - CORRECT ANSWER 1. Preliminary Treatment
2. Primary Treatment
3. Secondary Treatment
4. Tertiary Treatment
What are the drinking water treatment steps?* - CORRECT ANSWER 1. coagulation
2. Flocculation
3. Sedimentation
4. Filtration
5. Disinfection
*treated water
Preliminary Treatment in waste water - CORRECT ANSWER 1. Bar screening
2. Grit Removal
3. Pre-aeration
4. Flow-meter
5. Chlorine (optional)
Primary Treatment in waste water - CORRECT ANSWER sedimentation aka clarification tanks
- removes solids that can settle and floating debris
- uses coarse debris screens and sand and grit removal
Secondary Treatment in waste water - CORRECT ANSWER collects raw sludge and relocates
for a sludge digestion
-bio and chemical and physical treatment - further removal of solids and disabled solids of waste
water
what is an alternative secondary treatment in waste water? - CORRECT ANSWER Aeration
tanks - to help promote aerobic bacteria to grow which then attracts other bacteria to clump
together and settle for removal knows as "raw sludge",
-held up to 4 hours
,Tertiary Treatment in waste water - CORRECT ANSWER -Filtration of water
-filters to remove particles color and odor
-disinfection - destroys pathogens, bacteria
-tertiary used mainly for reclaimed water
-not done at many large treatment plants
Which waste water treatment is not done in many large treatment plants? - CORRECT
ANSWER Tertiary treatment - bc usually just for reclaimed water
secondary treatment usually enough to dispense into large body of water
After which waste water treatment is it enough to dump treated water into oceans, rivers? -
CORRECT ANSWER after the secondary treatment
What does the preliminary bar screening treatment do? - CORRECT ANSWER removes large
objects , roots, trash, paper, debris
1st line of defense
What does the Grit Removal in preliminary treatment do? - CORRECT ANSWER removes sand
and gravel
also slows down rate of influent water to let the rock, sand settle to bottom
waste water goes through multiple chambers to slow down water
what does the Pre-aeration in preliminary treatment do? - CORRECT ANSWER introduces
oxygen to freshen the waste water
it helps remove oil and scum
What does the flow-meter in preliminary treatment do? - CORRECT ANSWER measures the
rate of flow through out the plant
when is chlorine used in the preliminary treatment of waster water? - CORRECT ANSWER
when wastewater is highly active or reactive
usually optional
what is considered healthy state sludge in waste water treatment?* - CORRECT ANSWER
when digesting sludge by-products gases are at a certain %
, 65% methane
34% carbon Dioxide
< 1 % hydrogen sulfide
what happens in hydrogen sulfide gas increases in the sludge of waste water treatment?* -
CORRECT ANSWER considered a "sick state" sludge
must balance sludge to keep healthy and minimize sulfur odor
What some biological treatments process in secondary treatment? - CORRECT ANSWER 1.
Aerobic treatment
2. Anaerobic treatment
3. Stabilization Pond (lagoonization)
Aerobic treatment process in waster water? - CORRECT ANSWER -activated sludge
-trickling filter
-oxidation ponds
-composting
-subsurface disposal field
-done in secondary treatment
Anaerobic treatment Process in waste water? - CORRECT ANSWER -sludge digestion
-methan productions
-septic tanks
-composting
-done in secondary treatment
Stabilization Pond - CORRECT ANSWER -also called Lagoonization
-holds volume of water for a period of time at shallow depth (3-5 ft)
-to promote aerobic activity and purify the water
-remains for 45-60 days before use
done in secondary treatment
What is sludge? - CORRECT ANSWER solid portion of waste water
3 types
How many types of sludge are there? name them - CORRECT ANSWER 1. Raw Sludge
