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FIGURE 6.3 Sequential production dynamics of gases emitted from a sanitary landfill. (From Beeby, A. 1993. Applying Ecology. Chapman & Hall, London. With permission.)

FIGURE 6.3 Sequential production dynamics of gases emitted from a sanitary landfill. (From Beeby, A. 1993. Applying Ecology. Chapman & Hall, London. With permission.)

FIGURE 6.4 Energy circuit diagram of a landfill ecosystem.

Optimal sites for landfills are those which are socially acceptable, environmentally safe, and close enough to cities to have reasonable transportation costs. These sites are becoming difficult to locate, especially in highly developed regions such as the eastern U.S. and Europe where solid wastes have accumulated over long time periods. The current trend is to build and operate fewer but larger landfills and to transport wastes greater distances.

The most dangerous components of solid wastes to both humans and the environment are those categorized as hazardous, according to the U.S. Resource Con

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