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Decolourisation The pressed liquor from Filtration is passed through four guard filters containing multi-media filter material. This stage is to protect styrene resin from calcium carbonate which may have been carried over by filtration. In the second tank there is a double passage of styrene resin which removes colour molecules. This decolourised solution is known as fine liquor. After a period of time, the resin is regenerated with brine solution to ensure it operates at its maximum potential. In total, four vessels are operated with two chambers in each. The liquor can be further polished by a double passing through a column of granular active carbon from a mineral source, after which the total colour removal exceed 90%. |
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