True or False: The minimum velocity in gravity sewers should be 2.0 ft/s for self-cleansing. | Card: 3 / 48 |
Calculate F/M ratio: Flow = 5 MGD, BOD₅ = 200 mg/L, Volume = 2 MG, MLVSS = 2500 mg/L | Card: 5 / 48 |
Which parameter measures biodegradable organic matter in wastewater over 5 days? | Card: 7 / 48 |
Which process converts ammonia to nitrate? | Card: 19 / 48 |
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Fill in the blank: Trickling filters are _____-growth biological treatment systems. | Card: 25 / 48 |
A plant has high F/M ratio and poor settling. What operational change is needed? | Card: 27 / 48 |
Which equation is used for force main head loss calculations? | Card: 31 / 48 |
Calculate SRT: Basin volume = 2 MG, MLSS = 3000 mg/L, Waste rate = 0.2 MGD, Waste concentration = 8000 mg/L | Card: 35 / 48 |
Nitrification produces hydrogen ions (H⁺), which consume alkalinity for pH buffering. | Card: 38 / 48 |
Fill in the blank: Secondary treatment must achieve _____% BOD₅ and TSS removal minimum. | Card: 39 / 48 |
Denitrification in sludge blanket produces nitrogen gas bubbles causing flotation. | Card: 42 / 48 |
True or False: UV disinfection effectiveness depends on intensity × contact time. | Card: 43 / 48 |
Which process requires external carbon source for complete nutrient removal? | Card: 45 / 48 |
Calculate oxygen requirement: BOD removed = 1000 lb/day, sludge production = 400 lb VSS/day | Card: 47 / 48 |






