Industrial Ecology U.S.-Japan Perspectives (1994) / Chapter Skim
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Pages 23-27
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From page 23... ...
The workshop participants generally agreed that environmental risks posed by increased material flows can be addressed by improving industrial efficiency and by substituting less damaging materials for those currently used. From an industrial ecology perspective, change requires understanding what materials are involved and how they flow throughout an industrial system.
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From page 24... ...
of products is one component of a broader phenomenon called"dematerialization."i The trend toward increasing materials efficiency contributes to environmental quality, since it suggests that economic growth need not necessarily be accompanied by increased resource use and waste generation. Increasing Complexity Statistics concerning materials consumption do not capture a more subtle change that has potentially important environmental consequences the trend toward increasing complexity of materials use.
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From page 25... ...
The Japanese cement industry, over the past 20 years, has used waste from several diverse industry sectors as shown in Table 2. Of the 99 percent of blast furnace slag recycled in Japan, 60 percent, or 15.6 million tons per year, is recycled to cement kilns.
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From page 26... ...
Blast furnace slag, pig iron furnace slag, electric furnace slag, converting furnace slag Copper slag, iron concentrate, stack gas desulfilnzed gypsum Casing sand waste, waste wire covering Oil cokes, catalyst residue, used kaoline Automobile Inures, waste paint, waste oil, stack gas desulfilnzed gypsum Paper sludge, incineration ash of pulp sludge Used kaoline, waste oil Waste sugar dregs Used diatomaceous earth Waste earth from construction and recover energy from the wastes of other industries. The total amount of waste recycled in American kilns is equivalent to that recycled in one large Japanese enterprise.
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From page 27... ...
There are concerns that boilers, furnaces, and cement kilns in the United States are generally operated under less rigorous environmental requirements than commercial incinerators. This concern has also led to a temporary freeze on the development of new hazardous waste incinerators.
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