process for preparing klaerenden gefaerbten, waesserigen abwaessern

摘要

1392676 Treating water KANEBO Ltd 17 April 1973 [25 April 1972 8 May 1972] 18494/73 Heading C1C Waste coloured aqueous liquids containing at least one non-anionic colouring agent are clarified by treating with a coagulating agent containing at least one condensation product of sulphonated dihydroxydiphenyl-sulphones or sulphonated dihydroxydiphenyls with C 1-4 aliphatic aldehydes, or sulphonated condensation products of dihydroxydiphenyl-sulphones or dihydroxydiphenyls with C 1-4 aliphatic aldehydes, or alkali metal or ammonium salts thereof, and removing the coagulated colouring agent from the liquid. The coagulating agent may be used together with conventional agents such as aluminium sulphate, polyaluminium chloride, iron chlorides and sulphates and polyacrylamides.