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According to government data, activated sludge (AS), stabilization ponds (SP), and lagoon systems comprise 51%, 36%, and 13% of total WWTPs in Iran, respectively (MOE 2010). Table 5 presents the advantages and disadvantages of biological WWTPs’ performance (Pescod 1992).

Table 5

Advantages and disadvantages of biological WWTPs’ performance

Treatment systemsAS
 SP
ParametersConventionalExtended aerationOxidation ditchAerated lagoonAerationOther
BOD removal Average Average Good Good Good Good 
TSS removal Good Good Good Average Average Average 
Virus removal Average Poor Good Average Good Good 
Coliform removal Poor Average Average Average Good Good 
Treatment systemsAS
 SP
ParametersConventionalExtended aerationOxidation ditchAerated lagoonAerationOther
BOD removal Average Average Good Good Good Good 
TSS removal Good Good Good Average Average Average 
Virus removal Average Poor Good Average Good Good 
Coliform removal Poor Average Average Average Good Good 

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