Environmental Engineering FOURTH EDITION

476 ENVIRONMENTAL ENGINEEWNG

Gases (continued) chlorine, 15 1
measurement, 377-382 dose-response, 40-41
stack, 289,362,386-387 noise pollution, 437-440
Gaussian dispersion. See Air dispersion of radioactivity, 321-325
pollutants
General obligation bonds (GO), 25-27
Germ theory, 5
Grab samples, 8 1-82,38 1
Gravity settling tank, 140
Gravity thickener, 214-215,217-218
Gravity water, 108

Grit chamber, 172-173
Groundshine, 334
Groundwater, 108-109,247

Gray, 318-320

draw down, 112-115

hazardous waste, 297,301,303,

pollution, 53,73-75,97,235,241

radioactive materials, 334

solid waste disposal, 251,265-266,

3 10,349

342,344

Half life, physiological, 39

Half-life, 314-316,319,328-330,

332-334

Hazardous waste, 295-3 11

accidents, 301

chemical treatment, 298

classification, 297

clearinghouses, 302

detoxification, 298

groundwater, 115,297-298

hazardous waste exchanges, 301-303

incinerators, 304-308

land fills, 308-3 10

law, 75,345-350

manifests, 299-300

materials exchange, 302-303

recovery alternatives, 301

siting, 303-304

transportation, 299-301

volume reduction, 298-299

Haze hood, 353

Hazen-Williams formula, 122-126

Head capacity curve, 131-132

Health effects. See also Bacteria;

Carcinogens

air pollution, 375

risk assessment, 34,4143

thresholds, 9,3840,323-325

Heat island, 353-354,364

Heat value, 288

Heavy metals

measurement, 102-103

sludge, 207,209-210,230

toxic substances, 76,298

wastewater treatment, 168,187

HEPA filters. See Control of airborne

particulates, HEPA filters

Hertz, 425

Heuristic routing, 256-260

Homeostasis, 6

Hydraulic elements graph, 159,162

Hydraulic ram, 254

Hydraulics

conduit flow, 120-128

sewer, 157-164

244-245,247

automobile emissions, 233,403-406,

418419

pumps, 128-131

Hydrocarbons, 54,76,103,236,

Hydrogen

acceptor, 60,68

donor, 57

fuel cells, 2 1 1

ions, 91-95

solid waste energy recovery, 288-289

Hydrogen peroxide, 187

Hydrogen sulfide, 60,68,399,401

Hydrologic cycle, 107-108, 132

Hydrolysis, 150,299

Hygroscopic moisture, 108

Hypolimnion, 71-72

Impeller, 129-130

Incinerators

air emissions, 396

fluidized bed, 228-229

gas pollutant controls, 385,400,403

multiple hearth, 228-229

radioactive waste, 332

hazardous waste, 298,303-308