Recycled materials hazardous industrial waste

The beneficial reuse of foundry solid waste has long been carried out informally, particularly in the U.S. Foundry solid waste has always been used as fills around the foundry or nearby neighborhood. With the promulgation of strict environmental protection laws, foundry solid waste is now required to be landfilled. Later, spent foundry sand was selected as a daily cover for landfills that are cover short. However, many recyclers believe that foundry solid waste should not necessarily be disposed of in landfills where other hazardous industrial waste belongs, simply because the main fraction of foundry solid waste is nonhazardous and has value in fully or partially substituting for currently in-use materials, for example, construction aggregates, soils, and minerals. Thus, reuse of foundry solid waste is marketable. 

Mineral processing spent materials. Mineral processing generates spent materials that may exhibit hazardous waste characteristics. Common industry practice is to recycle these mineral processing wastes back into the processing operations to recover mineral value. U.S. EPA created a conditional exclusion from the definition of solid waste for these spent materials when recycled in the mineral processing industry, provided the materials are stored in certain types of units and are not accumulated speculatively. 

Based on the old adage, "a stitch in time saves nine," waste avoidance is an area where separations can be of great benefit to the environment. The use of separation technologies to reclaim/recycle materials has become a very Important area in environment restoration, and zero discharge is quickly becoming the goal of all waste producers. As the cost of the disposal of hazardous waste increases, industry has come to recognize that recycle, once more of a public relations effort, is now an economic necessity. 

The toxics issue must be solved in two basic ways. First, as much as possible of the hazardous wastes that already exist must be destroyed or recycled, and when necessary, safe methods must be used to store wastes that cannot be destroyed. Second, industrial wastes must be eliminated or reduced, at their source, to the fullest extent possible. Plants must be designed to produce no waste, or as little as possible greater efficient means less waste. This is the long-term answer to the problem—human ingenuity. Such things as closed-loop s5 stems and waste exchange (whereby the wastes of one process become the raw materials of another can minimize or eliminate entirely the need for the disposal of toxic wastes. like this already exist, and they are economically feasible. 

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