Environmental Engineering FOURTH EDITION

482 ENVIRONMENTAL ENGINEERING

Salmonella typhosa, 100
Salt, and radioactive waste disposal, 336
Sand beds, 218-219
Sand filters, 140-146,246,248,394
Sand, removal of, from wastewater, 172
Sanitary landfills. See Lanals
Sanitary sewers, 4,153-154,167
Saturation, zone of, 108-109
Screens, 4,172,282-283
Sedimentation tanks. See Settling tanks
Sedimentation, 141-143,174,245,247,

Sediments. See also Suspended

309

Sediments; Turbidity
erosion, 8, 16,235-245
Seeding, 86,244
Separate sewerage, 4
Separation efficiency, 388
Separation factor, 391
Separation of waste materials, 274-280,
282-286,298
hammermills, 275
shredding, 268,275-280
Septic tanks, 169-171,233,243
Settling tanks, 137, 140-141, 173-180,

Settling velocity, 176-177,179,216,284,

Sewage systems. See Wastewater

Shredding, 268,275-280

Sievea, 3 18-320

Sigma equation, 225

Significant deterioration, prevention of,

412413,417-418

Silt. See also Sediments, 243-244,246

water treatment, 135

Silviculture, 230,345

Siting

184,191,195

369-370,397

hazardous waste facilities, 10,25,

303-305,308

Siting

Size reduction. See Shredding

Slope factors

runoff, 236,239

Sludge, 205-232

as fertilizer, 209,228,230

characteristics, 207-2 10

dewatering, 218-228

landfills, 264-265

sources, 205-207

stabilization, 210-213

thickening, 214-218

viscosity, 208-209

yield stress, 208-209

214-216

ultimate di~posal, 228-230

Sludge volume index (SVI), 186, 195,

Smog, 287,361

Smoke, 34,39,306,330,361,377,382

Soil characteristics

runoff, 235-241

Soil Conservation Service, 237

Soil erodibility factor, 224-226

Solid waste, 251-263

air classifiers, 283-287

characteristics, 252-254

collection, 254-259

composting, 290-291

disposal, 259-261,263-271

energy recovery, 286-290

law, 341-350

leachate, 266

moisture concentration, 253-254

municipal, 252-259

plastics, 251,253,261,284-285

resource recovery, 280-28 1

screens, 28 1-283

separation process, 282-286

volume reduction, 269-270

Solid waste Disposal Act of 1965,342

Sones, 434

Sound, 423-426

frequency, 423-426

level, 430-434

level meter, 431433

pressure, 427-430

wavelength, 423-426

Special nuclear material, 33 1

Specific gravity of liquid, 81, 120

Specific resistance to filtration test,

Specific weight, 120-121, 130

Specific yield, 109-110

Speech Interference Level (SIL), 434

Spray tower, 387,394395,398-399

Stack gases

atmospheric dispersion, 362,367

Stack height. See Effective stack height

219-223