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Industrial Solid Waste

Industrial solid wastes include industrial process wastes and pollution control wastes generated by manufacturing or industrial processes that are not hazardous wastes.

Industrial process wastes include waste generated by electric utilities, steel mills, foundries, etc. Industrial process waste is defined in 329 IAC 10-2-95. Foundry waste includes sand, slag, sludge, core waste and dust fines from foundry operations.

Pollution control waste comes from the removal of contaminants from air (e.g., baghouse dust), water (e.g., wastewater treatment sludge) or land (e.g., spill cleanup waste). Pollution control waste is defined in 329 IAC 10-2-137.

Industrial solid wastes are often disposed at restricted waste sites (RWSs), but can also be disposed at MSWLFs, non-municipal solid waste landfills (non-MSWLFs).

If industrial waste is disposed at an RWS, industrial solid waste generators need to sample and analyze their wastes to determine their chemical concentration levels and obtain a waste classification from IDEM. This testing must be done at the point of generation of each waste stream. Based on the constituents’ concentrations, IDEM assigns one of 4 classes (Type I, Type II, Type III and Type IV).

Restricted waste site criteria are specified in 329 IAC 10-9-4.

Generators may also process their waste onsite or send offsite for further processing (e.g., a permitted processing facility to solidify or consolidate waste prior to disposal. You should contact the facility to determine whether they can accept your waste.

Coal Combustion Residuals (CCR) (326 IAC 4) are industrial wastes that are the byproducts of coal combustion at electric power plants. This includes include fly ash, bottom ash, boiler slag, and flue gas desulfurization byproducts. In Indiana, CCR waste is mostly disposed in restricted waste sites regulated under 329 IAC 10. With the passage of federal rules, these landfills must also comply with 40 CFR 257 subpart D.

CCR Surface Impoundments (ponds) are also regulated. Indiana has adopted the federal rules for CCR surface impoundments (40 CFR 257 Subpart D) by reference (329 IAC 10-9-1).

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