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National Pollutant Release Inventory (NPRI) Emission Estimate Guide for Primary Aluminum Producers

6. Identification of sources of releases and off-site transfers

This section presents the sources of releases to air, land and water bodies as well as off-site transfers.

Sources of air emissions from the following processes:

  • Receipt of raw materials
  • Storage of raw materials
  • Calcining of petroleum coke
  • Anode manufacturing
  • Anode baking
  • Anode sealing
  • Electrolysis
  • Butt cooling
  • Bath treatment
  • Butt processing
  • Casting centre
  • Skimming operations and Crucible repair
  • Dross storage
  • Cathode lining and delining
  • Spent pot linerstorage
  • Boilers
  • Maintenance shops
  • Accidental emissions

Emissions from these sources are released into the air by fans, dust collectors, outdoor vents, roof vents, etc.

Sources of releases to water bodies:

  • Final effluent in runoff
  • Process and cooling water
  • Combined final effluent
  • Accidental spills and leaks

Source of releases to land:

  • Spills

Off-site transfers:

NPRI substances that may be contained in:

  • Spent pot liner
  • Wet scrubber sludge
  • Wastewater treatment sludge
  • Aluminium dross
  • Other waste
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