Wastewater collections Exam Questions
with Answers
pH - ✔✔hydrogen ion concentration
Acidic - ✔✔pH less than 7 (Ionized "free" H+)
Basic - ✔✔pH greater than 7 (Ionized "free" OH-)
Neutral - ✔✔pH of 7
pH formula - ✔✔pH=-log[H+]
pH Difference - ✔✔10 Fold
Optimal pH for bacterial growth - ✔✔usually 6.8 to 7.2
Bacterial growth effect on pH - ✔✔Generally decreases pH
Alkalinity - ✔✔The ability for a solution to neutralize an acid
Measurement of Alkalinity - ✔✔mg/l of Calcium Bicarbonate
pH reading - ✔✔Read within 15 of collection
, Primary treatment - ✔✔Separations of floatable and settleable solids the wastewater using a
physical process
Primary removal of influent TSS - ✔✔40-60%
Primary removal of influent BOD - ✔✔25-50%
Primary removal of influent settleable solids - ✔✔95-99%
Primary sludge dried solids - ✔✔4-8%
Primary tank water velocity - ✔✔1 ft/sec (.3 m/sec)
Primary Detention time - ✔✔1-2 hours
Warm water - ✔✔Low viscosity, speeds up settling
Cold water - ✔✔High viscosity, slows settling
Activated Sludge process location - ✔✔After primary treatment
ASP components - ✔✔Aeration basin, secondary clarifier, and return system
Biological Oxygen Demand (BOD) - ✔✔The amount of oxygen required by aerobic
microorganisms to decompose the organic matter in a sample of wastewater.
BOD5 test - ✔✔Stored at 20 degrees Celsius for 5 days
with Answers
pH - ✔✔hydrogen ion concentration
Acidic - ✔✔pH less than 7 (Ionized "free" H+)
Basic - ✔✔pH greater than 7 (Ionized "free" OH-)
Neutral - ✔✔pH of 7
pH formula - ✔✔pH=-log[H+]
pH Difference - ✔✔10 Fold
Optimal pH for bacterial growth - ✔✔usually 6.8 to 7.2
Bacterial growth effect on pH - ✔✔Generally decreases pH
Alkalinity - ✔✔The ability for a solution to neutralize an acid
Measurement of Alkalinity - ✔✔mg/l of Calcium Bicarbonate
pH reading - ✔✔Read within 15 of collection
, Primary treatment - ✔✔Separations of floatable and settleable solids the wastewater using a
physical process
Primary removal of influent TSS - ✔✔40-60%
Primary removal of influent BOD - ✔✔25-50%
Primary removal of influent settleable solids - ✔✔95-99%
Primary sludge dried solids - ✔✔4-8%
Primary tank water velocity - ✔✔1 ft/sec (.3 m/sec)
Primary Detention time - ✔✔1-2 hours
Warm water - ✔✔Low viscosity, speeds up settling
Cold water - ✔✔High viscosity, slows settling
Activated Sludge process location - ✔✔After primary treatment
ASP components - ✔✔Aeration basin, secondary clarifier, and return system
Biological Oxygen Demand (BOD) - ✔✔The amount of oxygen required by aerobic
microorganisms to decompose the organic matter in a sample of wastewater.
BOD5 test - ✔✔Stored at 20 degrees Celsius for 5 days
