What is waste material? Define.
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"Waste are unwanted or unusable materials. Waste is any substance which is discarded after primary use, or is worthless, defective and of no use. A by-product by contrast is a joint product of relatively minor economic value. "
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Industrial processes, construction activities and power plants produce a wide range of solid byproducts and residues. The predominant waste products are generated from oil refineries, power plants, construction works, pharmaceuticals, and agricultural product producers.
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