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INTRODUCTION 1
SCREENS: Simple—Rotary—For deep
sewers—Mechanical—Other types 3
STORM-WATER OVERFLOWS: Diverting plate—Fixed
weirs—Movable weirs 16
DETRITUS TANKS: Capacity—Dortmund type—Apparatus
for sludge removal 23
TANKS: Various types—Capacities—General
construction details—Flow through tanks—Sludge
well—Roofs—Inlets and outlets—Precipitation
tanks—Dortmund types—Hydrolytic tank—Imhof
tank—Skegness tank—Candy-Whittaker tank—Non-septic
cylinder—“Kessel”—Separator—Fieldhouse tank—Dibdin
slate beds 29
SLUDGE DISPOSAL: Sludge removal—Apparatus—Chemical
mixers—Sewage mixers—Sludge presses—Hydro-extractor
for sludge—Sludge draining beds 71
PERCOLATING FILTERS: General design—Various
types of construction—Floors of filters—
Sub-drainage—Floor-tiles—Walls of filters—Planning
of filters—Filtering material—Grading of material
—Methods of distribution—Appliances for distribution
—Automatic revolving distributors—Power-driven
revolving distributors—Automatic travelling
distributors—Power-driven travelling distributors—Fixed
distributors—Troughs—Spray-nozzles—Methods of feeding
percolating filters—Continuous versus intermittent
supply—Supply channels and pipes-Dosing apparatus 85