Adsorption of ionic dyes on wool carbonizing waste

During wool processing, large volumes of wool carbonizing waste are produced; this consists of plant particles (mainly lignosulphonate) and short wool fibres that have undergone chemical modifications. Experiments have been carried out on the feasibility of using this waste material for decolorizing dyeworks waste waters; results are summarized in tables and graphs, and discussed. Best results were obtained at pH 2 for acid dyes and at pH values greater than 5 for basic dyes. A temperature above 60C was desirable. The adsorptive capacity of the wool waste was no greater than that of other adsorbents for basic dyes, but was 6 to 10 times greater for acid dyes. (Full translation 32 pounds sterling).