High sludge age mlss - Study guides, Class notes & Summaries
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Wastewater C License Florida exam 2023 with 100% correct answers
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Young Sludge Floc Size 
straggler Floc, large, fluffy, irregular shape 
 
 
 
Old Sludge Floc Size 
pin Floc, round, small, granular 
 
 
 
Young Sludge Foam Characteristics 
white, billowy, crisp 
 
 
 
Old Sludge Foam Characteristics 
shiny, dark tan, greasy, dark leathery 
 
 
 
Young Sludge Indicator Organisms 
Amoebae, Flagellates 
 
 
 
Old Sludge Indicator Organisms 
Rotifers, worms, nematodes 
 
 
 
Young Sludge MLSS 
low, under-oxidized 
 
 
 
Old Sludge MLSS 
high, over-oxidizes 
 
 
 ...
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TEXAS WASTEWATER LICENSE (TREATMENT) QUESTIONS AND ANSWERS
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Important factors that determine the type of treatment scheme that will be used include ________. 
Select one: 
 area available 
ent quality required 
ting costs 
 of the above 
d. 
all of the above 
 
 
 
Causes of sludge bulking include ________. 
Select one: 
 DO and presence of sulfides 
 supply too low 
ic loading rate too high 
ent imbalance 
 the above 
 the above 
 
 
 
A rotating biological contactor is ________. 
Select one: 
ced treatment rarely found in Texas 
b.a centrifuge for micr...
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Texas Wastewater A Exam Quuestions and Complete Solutions
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Texas Wastewater A Exam Quuestions and Complete Solutions 
 
What is TCEQ doing to control "point source" pollution of the Texas waterways? - Answer: *Permitting of domestic wastewater plants 
*Permitting of industrial wastewater plants 
 
Describe proper design of force main wastewater lines. - Answer: Minimum two fps velocity with the smallest pump operating alone. Minimum four inch diameter pipe with 150 psi rating. 
 
What is Standard Dimension Ratio? - Answer: Ratio of outside pipe diamet...
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Wastewater Exam Class C Questions and Answers Already Passed
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Wastewater Exam Class C Questions and Answers Already Passed 
The Activated Sludge Process: 
A. requires preaeration 
B. requires Activated Carbon 
C. is an aerobic biological process. 
D. Usually precedes primary sedimentation. E. Requires 50% by volume old sludge to work effectively. C. Is an Aerobic biological process 
A complete mix activated sludge plant has a fast settling sludge and high amounts of pin floc leaving the clarifier. One way to correct this problem is to : 
A. Increase the RA...
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WasteWater Operator class C exam practice review questions and answers with certified solutions
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WasteWater Operator class C exam practice review questions and answers with certified solutions 
When Chlorine is combined with water what type of pipe should be used? 
A. Ductile iron 
B. Asbestos concrete 
C. PVC D. Carbon Steel C. PVC 
A good settling sludge would consist of what type of protozoa? 
A. Rotifers and nematodes 
B. Amoebas and Flagellates 
C. Stalked ciliates and mastagoria D. Free swimmers and stalk ciliates D. Free swimmers and stalk ciliates 
What is Phenolphylein used for in ...
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Texas Wastewater Class A Exam Questions and Complete Solutions
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Texas Wastewater Class A Exam Questions and Complete Solutions 
 
Seeding of BOD samples is necessary when samples - Answer: (All of the above) have a chlorine residual, have a previously been chlorinated, have been subjected to high temperatures, contain high or low pH industrial wastes 
 
When is blue-green algae the most dominant on a pond treatment system? - Answer: Summer 
 
A 30-inch diameter wastewater interceptor is observed to be flowing half-full at about two fps. The approximate volum...
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FE Exam – Environmental with 100% correct answers 2024.
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WASTEWATER TREATMENT BIOLOGY - answer- 
 
Aerobic Decomposition - answer-decomposition of organic material in the presence of oxygen 
 
Aerobic Decomposition 
a. end products 
b. appropriate BOD levels 
c. how much sludge produced - answer-a. water, CO2, new cell material 
b. <500 mg/l (dilute ww) 
c. produces a lot of sludge 
 
Anaerobic Decomposition - answer-decomposition in the absence of oxygen and nitrate 
- primary electron acceptors are sulfate (SO42-), CO2, and organic compounds that...
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Wastewater Treatment Operator Certification Test #1 Questions With Correct Answers
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What is the methane content in a properly operation anaerobic digester? 
 
A) 30 to 35% by volume 
B) 1 to 2% by volume 
C) 65 to 70% by volume 
D) 15 to 20% by volume -ANSWER C) 65 to 70% by volume (v.2 pg 158) 
 
What will the addition of chlorine gas do to the pH of wastewater? 
 
A) Moderately increase pH 
B) pH will not be affected 
C) Significantly increase the pH 
D) Decrease the pH -ANSWER D) Decrease the pH (v.1 pg 349-350) 
 
What is the purpose of a Parshall flume? 
 
A) measure turb...
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Wastewater Exam Class C
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Wastewater Exam Class C 
The Activated Sludge Process: 
A. requires preaeration 
B. requires Activated Carbon 
C. is an aerobic biological process. 
D. Usually precedes primary sedimentation. 
E. Requires 50% by volume old sludge to work effectively. Ans- C. Is an Aerobic biological process 
A complete mix activated sludge plant has a fast settling sludge and high amounts of pin floc leaving the 
clarifier. One way to correct this problem is to : 
A. Increase the RAS Flow 
B. Reduce Wasting Rat...
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Wastewater Treatment Operator Certification Test #1(solved)
- Exam (elaborations) • 15 pages • 2022
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What is the methane content in a properly operation anaerobic digester? 
 
A) 30 to 35% by volume 
B) 1 to 2% by volume 
C) 65 to 70% by volume 
D) 15 to 20% by volume - ANSWER C) 65 to 70% by volume (v.2 pg 158) 
 
What will the addition of chlorine gas do to the pH of wastewater? 
 
A) Moderately increase pH 
B) pH will not be affected 
C) Significantly increase the pH 
D) Decrease the pH - ANSWER D) Decrease the pH (v.1 pg 349-350) 
 
What is the purpose of a Parshall flume? 
 
A) measure tu...
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