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Mr. Tom Horton Ak Project 939-02.22 <br /> January 25, 1990 <br /> Page 7 <br /> 4. Wood and Yard Waste Processing <br /> Many landfills divert concentrated loads of wood and yard waste to <br /> a separate tipping area. Once sufficient quantities accumulate, a <br /> mobile grinder unit is brought on-site to process the material. The <br /> ground material is usually screened to separate course and fine <br /> fractions. The course material is either sold as boiler fuel or <br /> landscaping material, and the fine material is composted and used <br /> for final cover material. <br /> 5. Sorting Before Disposal <br /> Stockpile areas for tires, mattresses, white goods, motor oil, <br /> batteries, etc., are commonly provided near landfill gatehouses to <br /> collect recyclable materials. <br /> 6. Concrete and Asphalt Recycling <br /> Some landfill operations collect and process concrete and asphalt. <br /> These materials are usually stockpiled until sufficient quantities <br /> accumulate for a contractor to profitably move on-site to process <br /> the material. Concrete is crushed and the reinforcing steel is <br /> removed. The rock portion is used as general aggregate and the <br /> steel is sold for scrap. Asphalt is crushed and recycled into new <br /> pavement. <br /> 7. Mechanized Materials Separating <br /> Some landfills, ones with large waste streams or with a <br /> predominant concentration of recoverable materials in the waste <br /> stream, are planning materials recovery facilities (MRF). These <br /> facilities are usually enclosed in a large metal building and they <br /> produce market ready (clean and transportable) materials. The <br /> sorting processes within each MRF are typically specifically <br /> designed and tailored to site specific waste stream characteristics. <br /> Final Pregaration of Target Materials <br /> Recycling operations at most landfills are generally designed to separate target <br /> materials, which will produce the maximum benefit. In some cases, target <br /> materials selection is based on market values and profitability (e.g., aluminum), <br /> and in other cases target materials are determined by relative abundance and the <br /> net reduction in volume of waste headed for the landfill (e.g., yard waste) <br /> Table 1 (next page) summarizes target materials and the final processes required <br /> to transform those materials into a marketable form. <br />