The state of the art in environmental pollution control and impact analysis Page: 12
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Hydrocarbon--any of a vast family of compounds containing
carbon and hydrogen in various combinations, found
especially in fossil fuels. Some of the hydrocarbon
compounds are major air pollutants; they may be carcino- 29
genic or active participants in the photochemical process.
Particulates--finely divided solid or liquid particles in
the air or in any emission. Partic ates include dust,
smoke, fumes, mist, spray, and fog.
Point source--in air pollution, a stationary source of a
Tirge individual emission, generally of an industrial
nature. This is a general definition; point source is
legally and precisely defined in federal regulations.31
Primary treatment--the first stage in waste water treat-
ment in which substantially all floating or settleable
solids are mechanically removed by screening and sedi-
mentation.32
Secondary treatment--waste water treatment, beyond the
primary stage, in which bacteria consume the organic
parts of the wastes. This biochemical action is accom-
plished by the use of trickling filters or the activated
sludge process. Effective secondary treatment removes
virtually all floating and settleable solids and approxi-
mately 90 per cent of suspended solids. Customarily,
disinfection by chlorination is the final stage of the
secondary treatment process.33
Solid waste--Useless, unwanted or discarded material with
insufficient liquid content to free flowing.34
Solid waste--those solid materials that are beyond the
reach of today's technology.35
Scrap--those solid materials that can be recycled at a
profit.36
29Ibid., p. 482. 30Ibid., p. 482.
31Ibid., p. 481. 32Ibid., p. 479.
33Ibid., p. 478. 34Ibid., p. 483.
35The Challenge of the Environment, p. 16.
36Ibid.
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Thibodeaux, Mary Shepherd. The state of the art in environmental pollution control and impact analysis, dissertation, May 1976; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc332517/m1/20/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .