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Treatment of aluminium brightening effluent

We are about to upgrade an aluminium brightening, anodising and dyeing line and desperately want to find the latest in effluent treatment technology. Is there something better than lime?

Richard Hutchinson
York, England

Current technology is closed loop control of brightener/first rinse with vacuum evaporation and partial reuse. Initial capital expenditure is high and disposal costs will always increase. Alternatively we can still take 100g/l PO4 down to 0.3ppm PO4 with a modified lime/caustic soda. method. (no nitric please) ...use the electrobrightening method). The method is in pH start point, addition points and correct flocculating agent. Its not pure precipitation, it involves adsorption onto a lime colloid.

John Tuohy
- Ireland

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