Agricultural and Industrial Waste Material

The quantity of industrial and agricultural waste material being injected into the nation's water supply has been widely publicized for many years. It was due, in part, to this publicity, that stringent legislation was enacted which helped somewhat to control the types and amounts of waste materials that could legally be added to our waterways.

The National Pollutant Discharge Elimination System (NPDES) was established to control the "point sources" where industry was found to have dumped fluids into the nation's water system. Over the past 15 years, conditions have improved significantly as the quality of the nation's water supply and the amount of aquatic life in these waters have improved significantly.

The nation's air quality has suffered a similar fate. Thi

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inding, blending, and conveying of solids on a very large scale)as well as with the associated heat treatment (pyroprocessing)(Bye 31). Energy use is considerable and is therefore constantly monitored so that improvements can be made. In the dry process, the raw materials are prepared for pyroprocessing as a blend of finely ground powders. The initial heating to about 800 degrees is carried out in a preheater using the carbon dioxide generated from the limestone and the hot combustion gases from the fuel which is burned in a short rotary kiln. The length-to-diameter ratio of this kiln in approximately 15 (Ibid.). In the wet process, the slurry of finely divided raw materials is pumped into a long rotary kiln with a length-to-diameter ratio of approximately 30 (Ibid.). The wet process was at one time very widespread. Rapid increases in fuel costs have accelerated its replacement since it involves the evaporation of water which constitutes approximately 35 percent of the slurry. In those areas where the primary raw material is a high-moisture-content chalk containing flint, the wet process has survived. After the raw materials are extracted from the quarry, they are crushed, ground, and blended to create the raw feed for
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Approximate Word count = 8064
Approximate Pages = 32 (250 words per page)

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