SME
Environmental Engineering · Problem type
The order of a treatment plant
Use this for “Put aeration, grit removal, disinfection, the primary clarifier and bar screens in plant order.”
Put in order
Put the stages of a wastewater treatment plant in order, from the inlet to the outfall.
1
?
2
?
3
?
4
?
5
?
6
?
7
?
Assumptions
•
Preliminary treatment (screens, grit) protects the pumps; primary settles solids; secondary lets microbes eat dissolved BOD.
•
Sludge from both clarifiers is a side stream, thickened, digested and dewatered, not a stage the water passes.
•
A typical activated-sludge plant: some add filters or nutrient removal before disinfection.
Topic check
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Related lessons
Wastewater treatment
Main lesson
BOD from a dilution test
Use this for “6 mL of wastewater in a 300 mL bottle drops the DO from 8.8 to 4.3 mg/L in 5 days. What is the BOD₅?”
F/M ratio and detention time of an aeration tank
Use this for “10,000 m³/d at 200 mg/L BOD enters a 3000 m³ tank held at 2500 mg/L MLVSS. What are F/M and the HRT?”