Lecture 1: Introduction Wastewater: liquid effluents derived from domestic sewage or industrial sources, which for reasons of public health and for recreational, economic, and aesthetic considerations, cannot be disposed of by discarding them untreated into lakes or streams Wastewater: liquid effluents derived from domestic sewage or industrial sources, which for reasons of public health and for recreational, economic, and aesthetic considerations, cannot be disposed of by discarding them untreated into lakes or streams Types: Types: Industrial: e.g., petrochemical, metallurgical, plastics industries Industrial: e.g., petrochemical, metallurgical, plastics industries Domestic: sewage, “gray water” (washing, bathing, cooking), food processing Domestic: sewage, “gray water” (washing, bathing, cooking), food processing Goals of WWTP: Goals of WWTP: Reduce organic content Reduce organic content Remove particles Remove particles Remove/inactivate pathogens Remove/inactivate pathogens Reduce inorganic nutrient levels Reduce inorganic nutrient levels

contaminants of concern in wastewater treatment suspended solids biodegradable organics pathogens, parasites nutrients priority pollutants refractory organics heavy metals dissolved inorganics

Municipal Water Treatment

Municipal Sewage Treatment

Primary Treatment

Secondary Treatment

Activated Sludge Figure 27.20a,b

Activated Sludge Components

Primary treatment of wastewater trickling filter aeration tank, activated sludge unit

Hyperion WWTP Key Data Key Data Plant capacity: 300,000 gallons/minute Plant capacity: 300,000 gallons/minute Site size: 144 acres (60ha) Site size: 144 acres (60ha) Associated sewer run: 6,000 miles (9,600km) Associated sewer run: 6,000 miles (9,600km) Water reclamation for re-use: 6% Water reclamation for re-use: 6% Energy recovery system generation capacity: 25,000kW (electrical) Energy recovery system generation capacity: 25,000kW (electrical) Total project cost: $1.4 billion Total project cost: $1.4 billion

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