RECYCLING WASTE POLYETHYLENE MATERIALS TO USEFUL PRODUCTS VIA PYROLYSIS
1.1 Background of study
Recycling is a process of changing waste materials into new products to prevent waste of potentially useful materials, reduce the consumption of fresh raw materials, energy usage, water and air pollution (from incineration), and lower greenhouse gas emissions as compared to plastic production. Recycling is a key component of modern waste reduction and is the third component of the “Reduce, Reuse and Recycle” waste hierarchy (lajeunesse,sara 2004).
The rate of consumption of plastic materials in the world is greatly expanding, more waste plastics are generated. In recent years, their generation amount in Korea becomes about four million per year, according to data from the National Institute of Environmental Research (Lajeunesse, Sara 2004). The disposal of waste plastic is mostly achieved by conventional ways such as landfill or incineration. However, these methods have a problem of a social resistance due to the air pollution, soil contamination, and the economical resistance caused by an increase of space and disposal cost. Thus, the recycling of plastic wastes as a cheap source of raw materials has become a predominant subject over all countries (Roach, John 2003). The development of technologies acceptable from the environmental and economical fields is one of the most important key factors. (Roach, John.2003). Plastic materials used for food storage, visible in all supermarkets, preserves freshness and flavor due to the ability to seal out contaminants. Polyethylene materials are useful over a wide temperature range, from frozen foods to microwavable packages1. Due to these benefits, plastics have become widely used. (lajeunesse,sara 2004).
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