Recycling Essay, Research Paper
RECYCLING.
Recycling is an ancient practice with many modern applications. It refers to the recovery and reuse of materials from spent products. In recent years recycling has become a major part of environmental policy, mainly because of the increased costs of solid- and hazardous-waste disposal, the scarcity of natural resources, and the growing concern over polluted land, water, and air.
There are two types of recycling operations: internal and external. Internal recycling is the reuse in a manufacturing process of materials that are a waste product of that process. Internal recycling is common in the metals industry. External recycling is the reclaiming of materials from a product that has been worn out or considered obsolete. An example of external recycling is the collection of old newspapers and magazines for the manufacture of newsprint or other paper products.
In some areas, industries are required to pretreat wastewater before it is funneled into a waterway. In homes, wastewater is sent to a sewage-treatment plant, where it is purified, recycled, and put back into the water-supply system. Many gardeners recycle organic, biodegradable kitchen scraps by mixing them with leaves and grass clippings in a compost mound. There the organic waste decomposes and is biochemically transformed into usable soil.
Successful recycling programs depend on several factors. There must be a general awareness of the problems caused by solid-waste disposal and an effective, inexpensive method for separating and collecting the recyclable materials. It also must be economically possible for industries to use and market recycled materials. In 1976 the United States Congress passed the Resource Conservation and Recovery Act, encouraging states to formulate solid-waste recovery plans. Many states set up special departments to assist local communities in their recycling efforts. Some communities adopted legislation that gives consumers the option of returning containers in exchange for a small deposit paid at the time of purchase.
In the United States, more than 150 million tons of solid waste are generated every year. This amounts to more than 3 pounds (1.4 kilograms) per person per day. In metropolitan areas, the daily production of solid waste is usually higher. Residents of New York City, for example, discard 26,000 tons of solid waste daily almost 7 pounds (3.2 kilograms) for each resident.
Domestic recycling efforts usually involve the salvage of materials associated with disposable products packages, bottles, and labels. The cost of disposing of the solid-waste materials mainly paper, glass, aluminum, and steel has steadily increased. In many cases the land used for garbage disposal, known as landfill areas, is too valuable to use as a dumping ground. As existing landfills reach their capacity, many municipalities turn to recycling programs as a relatively inexpensive alternative to landfill disposal. Some cities also solve energy-shortage problems and the need to dispose of growing amounts of organic wastes and garbage by converting waste into energy. This is done by pyrolysis, the incineration of refuse with a deficiency of air. While pyrolysis permits recovery of certain fuel gases, chemicals, and heat energy, it can also contribute to air pollution.
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