SCREENING AND SEDIMENTATION
228. Purpose. 229. Types of Screens. 230. Sizes of Openings.
231. Design of Fixed and Movable Screens. PLAIN
SEDIMENTATION. 232. Theory of Sedimentation. 233. Types of
Sedimentation Basins. 234. Limiting Velocities. 235. Quantity
and Character of Grit. 236. Dimensions of Grit Chambers. 237.
Existing Grit Chambers. 238. Number of Grit Chambers. 239.
Quantity and Characteristics of Sludge from Plain
Sedimentation. 240. Dimensions of Sedimentation Basins.
CHEMICAL PRECIPITATION. 241. The Process. 242. Chemicals.
243. Preparation and Addition of Chemicals. 244. Results. 383–409