Solid Waste Management

solid waste

solid waste, discarded materials other than fluids. In the United States in 1996, nearly 210 million tons—about 4.3 lb. (2 kg) per person daily (up from 2.7 lb./1.2 kg in 1960)—were collected and disposed of by municipalities. In that year, municipal garbage included 12.4 million tons of glass and about 80 million tons of paper and paperboard (by far the largest constituent); in addition enormous tonnages of food residues, yard trimmings, textiles, plastics, and sludge formed in sewage treatment were produced. Although the amount of the increase has been slowed somewhat by recycling and composting programs and improvements in packaging, the amount of solid waste continues to increase annually. Moreover, the most common disposal methods pollute land, water, or air to some degree (see pollution). Management of solid waste therefore presents an increasingly acute problem.

See also environmentalism; radioactive waste.

Landfills

Approximately 62% of municipal waste is placed in landfills. If the waste is dumped untreated, it can promote the proliferation of rats, flies, and other vermin, encourage growth of disease-carrying organisms, contaminate surface and underground water, scar the land, and preempt open space. An alternative method of solid waste disposal is the sanitary landfill, first employed in Fresno, Calif., in 1937: waste is spread in thin layers, each tamped compactly and covered by a layer of earth. While more expensive than open dumping, the sanitary landfill eliminates health hazards and permits reclamation of the site for construction, recreation, or other purposes. The chief drawbacks are that feasible locations are relatively rare and costly and that sites must be insulated from water resources to avoid polluting them (see water pollution). Both open dump and sanitary landfill disposal depend on the natural degradability of wastes for an ultimate return to normal earth conditions. Decay, however, takes time; buried paper, for example, can persist as long as 60 years. Many plastics and synthetic textiles do not degrade at all.

Incineration

To reduce the bulk of solid waste burning of paper, plastic, and other components is often resorted to, either in open dumps or incinerators. Fly ash, noxious gases, and chemical contaminants can thus be released into the air (see air pollution). However, new techniques for "scrubbing" pollutants from incinerator stacks are being developed. Incineration of typical garbage reduces its weight and volume by as much as 80%. Approximately 15.9% of municipal solid waste is combusted.

Recycling

Recycling of solid wastes is an option that many municipalities have explored in recent years. It not only facilitates disposal but conserves energy, cuts pollution, and preserves natural resources. To make cans from recovered aluminum, for example, requires 10% of the energy needed to make them from virgin ore. At the same time ore is saved, and the pollution resulting from mining and processing are avoided. Making steel bars from scrap requires 74% less energy and 50% less water, while reducing air-polluting emissions by 85% and mining wastes by 95%.

Similarly, sludge from treated sewage can be used for fertilizer, but it has been less costly to dump it at sea or on open land (see sewerage). Dumped sludge has killed marine life and threatened beaches along the Eastern seaboard; elsewhere in the United States it is a growing nuisance. Between 1975 and 1985 the amount of sludge dumped in U.S. coastal waters increased by 60%; the effects of dumping and illegal dumping are still felt despite the fact that it has been illegal since the beginning of 1992. Recycling and composting take care of approximately 2.7% of municipal solid waste.

New Techniques

The federal government now provides assistance to localities in developing new means of recovering materials and energy from solid waste, and encourages private industry to seek similar goals. One technique being tried involves intensified combustion of wastes to produce heat for generating power. A second promising approach is pyrolysis, the thermal decomposition of wastes in controlled amounts of oxygen to produce valuable petrochemicals; the residue is an inert char of little bulk. Another method of reducing solid wastes is to replace polystyrene packaging with less bulky wrapping made largely of paper. Wider application of such processes is being advocated not only to diminish pollution of the environment by solid waste, but also to conserve natural resources.

The Columbia Encyclopedia, 6th ed. Copyright© 2013, The Columbia University Press.

Selected full-text books and articles on this topic

Moving to Markets in Environmental Regulation: Lessons from Twenty Years of Experience
Jody Freeman; Charles D. Kolstad.
Oxford University Press, 2007
Librarian’s tip: Chap. 11 "An Economic Assessment of Market-Based Approaches to Regulating the Municipal Solid Waste Stream"
Public versus Private Delivery of Municipal Solid Waste Services: The Case of North Carolina
Bae, Suho.
Contemporary Economic Policy, Vol. 28, No. 3, July 2010
Staying Informed of Solid-Waste Disposal Options: A Brief Primer on What Managers Need to Know about New Conversion Technologies
Rogoff, Marc; Clark, Bruce.
Public Management, Vol. 94, No. 8, September 2012
Applying the Miceli Model to Explain Cooperation in Municipal Solid Waste Management
Tiller, Kelly J.; Jakus, Paul M.
Agricultural and Resource Economics Review, Vol. 34, No. 2, October 2005
Economics and the Environment: A Signalling and Incentives Approach
Ian Wills.
Allen & Unwin, 2006 (2nd edition)
Librarian’s tip: Chap. 16 "Social Coordination in Waste Disposal and Recycling"
Illegal Disposal of Commercial Solid Waste: A Dynamic Analysis
Ferrara, Ida.
Atlantic Economic Journal, Vol. 36, No. 2, June 2008
A Field-Based Procedure for Determining Number of Waste Sorts for Solid Waste Characterization
Sharma, Mukesh; McBean, Edward.
Journal of Environmental Engineering and Science, Vol. 7, No. 3, May 2008
Cash for Your Trash: Scrap Recycling in America
Carl A. Zimring.
Rutgers University Press, 2005
Urban Recycling and the Search for Sustainable Community Development
Adam S. Weinberg; David N. Pellow; Allan Schnaiberg.
Princeton University Press, 2000
Librarian’s tip: "The Consolidation of the Recycling and Solid Waste Management Industry" begins on p. 25
Organizations, Policy and the Natural Environment: Institutional and Strategic Perspectives
Andrew J. Hoffman; Marc J. Ventresca.
Stanford University Press, 2002
Librarian’s tip: Chap. 14 "Policy Discourse, Logics, and Practice Standards: Centralizing the Solid Waste Management Field"
When Does Interstate Transportation of Municipal Solid Waste Make Sense and When Does It Not?
Podolsky, Michael J.; Spiegel, Menahem.
Public Administration Review, Vol. 59, No. 3, May 1999
The Role of Social Capital in Development: An Empirical Assessment
Christiaan Grootaert; Thierry Van Bastelaer.
Cambridge University Press, 2002
Librarian’s tip: Chap. 6 "Does Social Capital Increase Participation in Voluntary Solid Waste Management? Evidence from Dhaka, Bangladesh"
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