Activated sludge process: F/M ratio, MLSS, SRT and SVI
How the most common sewage treatment process works, and the four numbers operators watch every day.
Subject
Environmental Engineering
Water supply, sewage treatment and solid waste.
BOD: what it measures and how to calculate it
Biochemical oxygen demand, the first-order BOD curve, the dilution test, and the effect of temperature on the rate constant.
Population forecasting for water supply design
Arithmetic, geometric and incremental increase methods with a worked example, and how per capita demand turns population into flow.
Settling tanks: Stokes' law and surface overflow rate
How fast particles settle, why tank depth doesn't decide removal, and how to size a sedimentation tank.
How a water treatment plant works, unit by unit
From intake to tap: screening, aeration, coagulation, flocculation, sedimentation, filtration and disinfection.