Chapter II: SEWAGE DISPOSAL METHODS, Need for Proper Disposal—Sewerage

Systems—Purification of Sewage—Processes of Purification—
Dilution—Screening—Grit Chambers—Straining or Roughing—
Treatment in Tanks—Plain Sedimentation—Septic Process—The
Imhoff Tank—Chemical Precipitation—Slate Beds—Dosing
Chambers—Contact Filters—Trickling, Percolating or
Sprinkling Filters—Intermittent Sand Filters—Broad
Irrigation—Disinfection—Activated Sludge Process—Other
Processes—Trade Wastes—Sludge Disposal and Value—Management
and Supervision 71