||eCFR Subpart DDDD [ecfr.gov]
This subpart applies to CISWI units that:
- Commercial/industrial solid waste incineration (CISWI) units that commenced construction on or before June 4, 2010;
- CISWI units that commenced modification or reconstruction after June 4, 2010 but on or before August 7, 2013.
CISWI units that undergo modification or reconstruction on or after June 1, 2001 become subject to NSPS CCCC and are no longer subject to this subpart. Changes made to existing CISWI units to comply with this subpart do not qualify as modifications or reconstructions.
Commercial and Industrial Solid Waste Incineration (CISWI) Unit:
Solid Waste Definition:
- Any distinct operating unit of any commercial or industrial facility that combusts, or has combusted in the preceding 6 months, any solid waste as defined in 40 CFR Part 241.
- Includes, but is not limited to, the solid waste feed system, grate system, flue gas system, waste heat recovery equipment, and bottom ash system.
- Does not include air pollution control equipment or the stack.
- Any garbage, or refuse, sludge from a wastewater treatment plant, water supply treatment plant, or air pollution control facility and other discarded material, including solid, liquid, semi-solid, or contained gaseous material resulting from industrial, commercial, mining, and agricultural operations, and from community activities.
- Does not include solid or dissolved materials in domestic sewage, or solid or dissolved materials in irrigation return flows or industrial discharges that are permitted point sources.
Not subject to this subpart*:
- Pathological waste incineration units that burn ≥ 90% by weight of pathological waste, low-level radioactive waste, and/or chemotherapeutic waste;
- Municipal waste combustion units subject to NSPS Cb, Ea, Eb, AAAA, or BBBB;
- Medical waste incineration units subject to NSPS Ce or Ec;
- Small power production facilities;
- Cogeneration facilities;
- Hazardous waste combustion units required to get a permit per Section 3005 of the Solid Waste Disposal Act;
- Material recovery units (e.g., primary/secondary smelters);
- Air curtain incinerators that burn 100% wood waste, 100% clean lumber, or a combination of only wood waste, clean lumber, and/or yard waste totaling 100%;
- Sewage treatment plants subject to NSPS O;
- Sewage sludge incinerators subject to NSPS LLLL or MMMM;
- Other solid waste incineration units subject to NSPS EEEE or FFFF.
*Certain rule requirements, including notification, recordkeeping, and reporting requirements may still apply, and may be required for exemption (per 40 CFR 60.2555). Please see rule text for full details.
- Air curtain incinerators that burn only 100% wood waste, clean lumber, and/or yard waste.