A lead-acid battery recycling plant located near Montreal, Quebec produces process water that is highly loaded with lead and sulphate. The water is treated with lime in a plant that produces variable density sludge that can contain up to 10% solids.
Although the facility is dated, this treatment is very effective in precipitating metals including lead, but very limited in terms of sulphate treatment in this case because sulphate is associated with sodium in the process water, present at concentrations up to 81,000 mg/L as Na2SO4.
A scoping study of the technologies available to reduce sulphate concentrations in the final effluent was prepared.
Location: Sainte-Catherine, Quebec, Canada
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