HF: hollow fiber
FS: flat sheet
S: fine screening
PC: Primary clarification
CAS: Conventional activated sludge process
IF: Integrated fixed-film activated sludge process
D (MBR−IF): two parallel treatment lines with different technologies, an MBR and an IF
H (MBR−CAS): hybrid configuration including an aerated tank and membrane filtration tank that have the identical pretreatment and maintain a secondary settler to treat peak flows.