Environmental Engineering Reference
In-Depth Information
System (i): Oxidation Pond Treatment Systems
(A)
Septic Tank
(12 hrs.)
Oxidation Pond
(30 days)
Effluent
(B)
Anaerobic Pond
(4 days)
Oxidation Pond
(26 days)
Effluent
Anaerobic/Oxidation
Pond
(30 days)
(C)
Screening/Grit
Removal
Influent
Effluent
System (ii): Aerated Lagoon Treatment System
Screening/
Grit
Removal
First Aerated
Pond
Second Aerated
Pond
Treated
Effluent
Influent
System (iii): Extended Aeration Treatment Systems
Return Sludge
Aeration
Tank
(24 hours)
(A)
Settling
Tank
Inlet Screens
Influent
Effluent
Waste
Sludge
Dewatering Belt
or Drying Beds
Final Sludge
Disposal
Sludge
Thickener
Aeration
Tank
(24 hours)
(B)
Inlet
Screens
Effluent
System (iv): Activated Sludge Treatment System
Return Sludge
Inlet
Screens
Primary
Clarifier
Aeration
Tank
Secondary
Clarifier
Influent
Effluent
Waste sludge
Primary
Sludge
Thickener
Secondary
Sludge
Thickener
Sludge
Digester
Dewatering Belt
or
Drying Beds
Final Sludge
Disposal
Recommended standard sewage treatment systems
105
.
FIGURE 4.7
