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Air Emissions—Case Studies
2008
A noteworthy performance in GHG emission reduction
In 2002, Alcoa Canada Primary Metals was the first corporation to sign a voluntary greenhouse gas (GHG) emissions reduction agreement with the Government of Quebec. This five-year agreement fixed specific reduction targets and required compensation to be paid if the targets were not reached.
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Fluorides: landmark results at the Deschambault Smelter
Despite increasing production, the Deschambault Smelter achieved its lowest fluoride emissions ever in 2007: 0.26 kg F/t Al compared to an annual average of 0.32 kg F/t Al over the last few years. Emissions are measured in two locations, at the scrubbers and at the roof vents, and measures have been specifically adopted in both places to achieve this strong performance.
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The ABS approach to better environmental compliance
New, stricter regulations will be going into effect in 2010 for polycyclic aromatic hydrocarbons (PAH) emissions – contaminants produced during the combustion of organic matter. In anticipation of these harsher requirements and to ensure compliance, the Baie-Comeau Smelter applied ABS (Alcoa Business Systems) tools such as visual management and the standardization of work methods to reduce emissions at its Söderberg potrooms.
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Alcoa takes active part in the PRRI
The Programme de Réduction des Rejets Industriels (PRRI) (Industrial Waste Reduction Program) of Quebec’s Ministère du Développement durable, de l’Environnement et des Parcs aims to gradually reduce industrial waste. This strategy targets some 250-300 companies in the industrial sector whose discharge of contaminants can have a potentially significant impact on the surrounding area.
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2007
Daily management of scrubbers in the Electrolysis sector
The Air Environment team at the Deschambault aluminum smelter has developed a highly effective tool for optimally managing fluoride emissions at the scrubbers in the Electrolysis sector.
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Replacing pot hoods in the Electrolysis sector
A curved electrolytic pot hood has two marked advantages relative to a flat one. First, it is more solid, and thus less likely to be damaged in the potline. Secondly – and this is environmentally significant – it is more air tight and accordingly reduces fluoride emissions.
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Testing hybrid pitch at the Söderberg pots
To meet future government environmental standards, the Baie-Comeau aluminum smelter is working on reducing its polycyclic aromatic hydrocarbon (PAH) emissions, which are produced during the combustion of briquettes in the anodes of the Söderberg pots. The new standards will be 0.30 kg/metric ton of aluminum (mt Al) and, in 2010, they will go down to 0.20 kg/mt Al.
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Reducing greenhouse gases: a winning proposition for the Bécancour aluminum smelter
Thanks to persistent teamwork, the Bécancour aluminum smelter (ABI) has made remarkable progress in reducing greenhouse gases. For several years, the plant has applied itself to the task of reducing emissions of perfluorocarbons (PFCs), which are potent greenhouse gases.
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