Hitherto, the coagulation process and the activated sludge process have been mostly used for treatment of dyeing waste water. In this paper, an ultrafiltration method is applied for dye removal from waste water.
The rejection rates are high, for the molecular weights of dyes are larger than 620, in treatments of both acid dyes and substantive dyes. When the molecular weights of dyes do not exceed 620, the rejection rate is comparatively higher for substantive dyes, compared with acid dyes.
Relationships between the rejection rate and the structure, size and shape, and concentration of dyes, are investigated and the effects of pH, temperature and amount of feed solution are also examined.
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