©THESTAR EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
Wastewater B License Fl Study Guide.
3 Amigos
- Answers✔F/M, SVI, Current WAS rate
3 M's
- Answers✔MLSS, MLVSS, MCRT
High Sludge Age =_________ MCRT - Answers✔High MCRT
High Sludge Age=_______ MLSS - Answers✔High MLSS
Older Sludge F/M ratio - Answers✔=< 0.1 lbs/day CBOD : 1lb MLVSS
Young Sludge Bacteria - Answers✔Amoebas, Flagellates, Swimming ciliates
Old Sludge Bacteria - Answers✔Nocardioforms, Rotifers, Nematodes
To reduce F/M Ratio _______ the waste rate - Answers✔reduce the waste rate
6 Reasons for Filament Bacteria to flourish: - Answers✔Low F/M RATIO, High MCRT
Low DO
Septic/High Organic Acids
Nutrient imbalance in influent
Low pH
FOG
Successful Biological Nutrient Removal (BNR) need specific environmental conditions -
Answers✔Air and Water Temperature
pH
Alkalinity
Nutrients
, ©THESTAR EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
MCRT/SRT
Proper respiratory conditions
Water Temp for BNR - Answers✔Ideal is 77° - 95° F
Below 59°F inhibit bacteria
Above 104°F kills bacteria
pH for BNR - Answers✔Ideal is 7.0 to 8.0
Below 6.5 inhibit bacteria
Below 6.0 kills bacteria
Essential Nutrients for BNR - Answers✔Carbon, Nitrogen, Phosphorus
DO levels should be - Answers✔2 mg/L
Anaerobic Microorganisms are - Answers✔Methane formers, Sulfate reducing bacteria
Aerobic Microorganisms are - Answers✔Nitrobacter, Nitrosomonas, Floc formers
Anoxic Conditions - Answers✔No free DO.
Nitrate or Nitrite is present as a combined oxygen source.
Heterotrophic bacteria - Answers✔Bacteria that use organic carbon as a source of nutrients.
Protozoa, fungi, and most bacteria fall into this category.
Autotrophic bacteria - Answers✔Self nourishing bacteria.
Are nitrifiers.
High Chlorine demand caused by - Answers✔High effluent nitrite
Poor fecal coliform kills caused by - Answers✔poor chlorine residual
Steps in BNR - Answers✔1. Ammonification
2. Nitrification
3. De-nitrification
Ammonification (nitrogen cycle) - Answers✔Conversion of organic N to ammonia or
ammonium
Nitrification (nitrogen cycle) - Answers✔The biological oxidation of ammonia or ammonium to
nitrite followed by the oxidation of the nitrite to nitrate.
ALL RIGHTS RESERVED.
Wastewater B License Fl Study Guide.
3 Amigos
- Answers✔F/M, SVI, Current WAS rate
3 M's
- Answers✔MLSS, MLVSS, MCRT
High Sludge Age =_________ MCRT - Answers✔High MCRT
High Sludge Age=_______ MLSS - Answers✔High MLSS
Older Sludge F/M ratio - Answers✔=< 0.1 lbs/day CBOD : 1lb MLVSS
Young Sludge Bacteria - Answers✔Amoebas, Flagellates, Swimming ciliates
Old Sludge Bacteria - Answers✔Nocardioforms, Rotifers, Nematodes
To reduce F/M Ratio _______ the waste rate - Answers✔reduce the waste rate
6 Reasons for Filament Bacteria to flourish: - Answers✔Low F/M RATIO, High MCRT
Low DO
Septic/High Organic Acids
Nutrient imbalance in influent
Low pH
FOG
Successful Biological Nutrient Removal (BNR) need specific environmental conditions -
Answers✔Air and Water Temperature
pH
Alkalinity
Nutrients
, ©THESTAR EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
MCRT/SRT
Proper respiratory conditions
Water Temp for BNR - Answers✔Ideal is 77° - 95° F
Below 59°F inhibit bacteria
Above 104°F kills bacteria
pH for BNR - Answers✔Ideal is 7.0 to 8.0
Below 6.5 inhibit bacteria
Below 6.0 kills bacteria
Essential Nutrients for BNR - Answers✔Carbon, Nitrogen, Phosphorus
DO levels should be - Answers✔2 mg/L
Anaerobic Microorganisms are - Answers✔Methane formers, Sulfate reducing bacteria
Aerobic Microorganisms are - Answers✔Nitrobacter, Nitrosomonas, Floc formers
Anoxic Conditions - Answers✔No free DO.
Nitrate or Nitrite is present as a combined oxygen source.
Heterotrophic bacteria - Answers✔Bacteria that use organic carbon as a source of nutrients.
Protozoa, fungi, and most bacteria fall into this category.
Autotrophic bacteria - Answers✔Self nourishing bacteria.
Are nitrifiers.
High Chlorine demand caused by - Answers✔High effluent nitrite
Poor fecal coliform kills caused by - Answers✔poor chlorine residual
Steps in BNR - Answers✔1. Ammonification
2. Nitrification
3. De-nitrification
Ammonification (nitrogen cycle) - Answers✔Conversion of organic N to ammonia or
ammonium
Nitrification (nitrogen cycle) - Answers✔The biological oxidation of ammonia or ammonium to
nitrite followed by the oxidation of the nitrite to nitrate.
