Emission estimate guide for primary aluminum producers: chapter 10


10. Estimating off-site transfers (disposal and recycling) - Under development

This section presents the appropriate tools for estimating releases during off-site transfers.

10.1 Main types of waste transferred off site: spent pot liners, wet scrubber sludge, water treatment sludge and aluminium dross

10.1.1 Process description

NPRI substances that may be contained in residues from the dismantling of electrolysis pots (spent pot liners), wet scrubber sludge, waste water sludge and aluminium dross. What goes out (transfer) needs to be separated from what returns (raw material to be included in calculating the substance threshold).

10.1.2 Releases

Polycyclic aromatic hydrocarbon (PAHs), metals

10.1.3 Transfer calculations

The spreadsheet provides a list of substances generally contained in waste transferred off site for disposal or recycling. If the information or measurement is not available, for example, users can use one of the approaches mentioned in the Emission Codes Table.

10.2 Other waste

10.2.1 Carbon-based waste

10.2.1.1 Process description

NPRI substances contained in carbon-based waste, such as excess ramming paste and used oil containing PCBs.

10.2.1.2 Releases

Metals, PAHs

10.2.1.3 Transfer calculations

The spreadsheet  does not yet contain a standard procedure for estimating transfers from other carbon-based waste; users can therefore use one of the approaches mentioned above in the Emission Codes Table.

10.2.2 Non-carbon-based waste

10.2.2.1 Process description

NPRI substances that may be contained in other materials, water contaminated with oil and carbon, used filter bags and refractories from baking furnaces.

10.2.2.2 Releases

Metals, PAHs

10.2.2.3 Transfer calculations

The spreadsheet  does not yet contain a standard procedure for estimating transfers from other waste; users can therefore use one of the approaches mentioned in the Emission Codes Table.

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