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Colored compounds adsorption from the textile dyeing effluents on activated carbons produced from various indigenous vegetable sources by zinc chloride activation is studied. The most important parameters in chemical activation were found to be the chemical ratio of ZnCl₂ to feed (3:1), carbonization temperature (460?470 ℃) and time of activation (75 min). The absorbance at 511 ㎚ (red effluent) and 615 ㎚ (blue effluent) are used for estimation of color. It is established that at optimum temperature (50 ℃), time of contact (30?40 min) and adsorbent loading (2 g/L), activated carbons developed from rain tree (Samanea saman) saw dust and blackberry (Randia formosa) tree saw dust showed great capability to remove color materials from the effluents. It is observed that adsorption of reactive dyes by all types of activated carbons is more than that of disperse dyes. It is explained that because of its acidic nature the activated carbon can adsorb better reactive dye particles containing large number of nitrogen sites and ?SO₃Na group in their structure. The use of activated carbons from the indigenous biomass would be economical, because saw dusts are readily available waste worldwide.

Color Removal from Dyeing Effluent using Activated Carbons Produced from Various Indigenous Biomass