Secondary sludge recirculation
and extraction
Membrane basin
Anaerobic
Anoxic
Carbon, nitrogen and phosphorus removal from organic matter, human
waste, soap, detergents, etc.
Wastewater
Sieving
Secondary biological treatment
Primary clarifier, sand, gravel, fat and grease removal
Primary sludge decantation and removel
Primary treatment, waste settling
Treated Wastewater
FeCl3
A stream
Nitrate recirculation
Secondary sludge recirculation
and extraction
Crops irrigation
Aerobic
Coarse debris screen
Fig. 1
Urban wastewater treatment using activated sludge technology
52
E. Ammar et al.