Wastewater Treatment Operator Study Guide
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Grade V-Week 3 Study Guide Texas CNG Delivery Truck Driver Ex... NFPA 13 2022 Chapter 23 Maryla
197 terms 223 terms 33 terms 25 terms
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What is BOD? The amount of oxygen bacteria need to break down pollution.
Memory Trick:
More pollution = More hungry bacteria = More oxygen needed.
CBOD vs BOD? CBOD = Carbon only
BOD = Carbon + Nitrogen
Think:
CBOD = Chlorine Blocked Nitrification
Why is ammonia oxidation more expensive? Carbon removal
≈1.5 lb O₂/lb BOD
Ammonia removal
≈4.57 lb O₂/lb NH₃
Nitrifiers require much more oxygen.
, High MLSS Increase WAS.
High MCRT
High SVI Old sludge must leave the system.
Blanket rising
Effluent TSS increasing
What adjustment fixes the root cause?
DO = 0.8 Nitrification.
Ammonia increasing
MCRT = 2 days Increase aeration.
What process is failing? Increase sludge age.
High F/M means... Lots of food
Young sludge
Rapid growth
Poor nitrification
Low F/M means... Old sludge
Stable process
Excellent nitrification
Lower sludge production
What controls sludge age? WAS.
Waste more
↓
Younger sludge
Waste less
↓
Older sludge
Blanket rising Increase WAS.
SVI increasing
Effluent cloudy The sludge is becoming too old.
What should the operator do?
Primary sludge smells like rotten eggs. Sludge became septic.
Why? Hydrogen sulfide formed.
Pump sludge more frequently.
VA increasing Digester is souring.
pH dropping
Gas decreasing Methane bacteria are losing.
Root problem?
Leave the first rating
Students also studied
Flashcard sets Study guides
Grade V-Week 3 Study Guide Texas CNG Delivery Truck Driver Ex... NFPA 13 2022 Chapter 23 Maryla
197 terms 223 terms 33 terms 25 terms
shalamarhill Preview prestonx1006 Preview conorwhite202 Preview mjc
Terms in this set (54) Hide definitions
What is BOD? The amount of oxygen bacteria need to break down pollution.
Memory Trick:
More pollution = More hungry bacteria = More oxygen needed.
CBOD vs BOD? CBOD = Carbon only
BOD = Carbon + Nitrogen
Think:
CBOD = Chlorine Blocked Nitrification
Why is ammonia oxidation more expensive? Carbon removal
≈1.5 lb O₂/lb BOD
Ammonia removal
≈4.57 lb O₂/lb NH₃
Nitrifiers require much more oxygen.
, High MLSS Increase WAS.
High MCRT
High SVI Old sludge must leave the system.
Blanket rising
Effluent TSS increasing
What adjustment fixes the root cause?
DO = 0.8 Nitrification.
Ammonia increasing
MCRT = 2 days Increase aeration.
What process is failing? Increase sludge age.
High F/M means... Lots of food
Young sludge
Rapid growth
Poor nitrification
Low F/M means... Old sludge
Stable process
Excellent nitrification
Lower sludge production
What controls sludge age? WAS.
Waste more
↓
Younger sludge
Waste less
↓
Older sludge
Blanket rising Increase WAS.
SVI increasing
Effluent cloudy The sludge is becoming too old.
What should the operator do?
Primary sludge smells like rotten eggs. Sludge became septic.
Why? Hydrogen sulfide formed.
Pump sludge more frequently.
VA increasing Digester is souring.
pH dropping
Gas decreasing Methane bacteria are losing.
Root problem?
