Effluent treatment with hydrotalcite
AssigneeCrosfield Limited
InventorsKeith Robert Cockett, Maurice Webb, Roderick Terence Whalley
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Abstract
Effluents containing residual dyes are contacted with an effective amount of hydrotalcite-like material together with an effective amount of a magnesium salt or a mixture of magnesium salts, the weight ratio (on dry basis) of hydrotalcite-like material to magnesium salt being in the range of 20:1 to 1:20. Residual dyes are removed from effluents.
Claims8
Process for removing residual dyes from effluents which comprises lowering the pH of the effluent to be treated to between pH 4 and pH 5.5, adding an effective amount of hydrotalcite-like material to the effluent to be treated, and then raising the pH of the effluent to above 7.
Dependencies are inferred from the claim text.