Abstract
Leather industries are one of pollution-intensive industrial complexes generating huge volumes of liquid and high concentration of solid wastes. Tanneries use different harmful chemicals like (chromium, sulphuric acid, dyes, etc) in their processing. They could have a number of adverse impacts on the environmental eco-system as well as on the society living around. In this study, fleshed parts of tannery solid wastes were brought from Bahir Dar leather factory to synthesize an activated carbon used for effective removal of chromium, mordant black-11 and red azo dyes from the aqueous solution. Fleshed tannery waste activated carbon (FTWAC) characterized by FTIR which shows acidic properties, surface area by BET was 535.02 m2/g and different physical and chemical properties were determined. The concentration of Cr(VI) was determined by ICP-OES, but mordant black-11 and red azo dyes were determined by UV-Vis spectroscopy instrument. Freundlich isotherm model is well fitted than Langmuir model for the adsorption. Generally the results showed that the removal efficiency of FTWAC for Cr(VI) over 99%, for mordant black-11 dye over 97% and red azo dye over 93% were achieved. Therefore, using FTWAC for treatments of chromium and dyes in the effluent wastes for leather industry is economical and viable option.
Highlights
The major causes of water pollution due to toxic heavy metals and dyes are the big concern for chemical and environmental engineers, which is because of excessive release of pollutants into the surrounding environment, due to the expansion of industrialization and urbanization
This thesis work mainly focused on the characterization of activated carbon made from fleshed part of the skin and optimization of chromium, mordant black and azo dye, removal efficiency and adsorption capacity of the activated carbon synthesized from fleshed part of skin were analyzed
In this study mainly focused on the optimization of removal efficiency and adsorption capacity of the activated carbon synthesized from fleshed parts of tannery solid wastes
Summary
The major causes of water pollution due to toxic heavy metals and dyes are the big concern for chemical and environmental engineers, which is because of excessive release of pollutants into the surrounding environment, due to the expansion of industrialization and urbanization. The majority of industries such as paper and pulp, cosmetics, paints and pigments, plastics, leather tanning, and textile industries generate a huge amount of colored effluent and considerable amount of toxic metals and the waste effluents need treatment. The discharge of such effluents causes toxicological and aesthetical problems. Out of a number of industries leather tanning industry is a major source of colored effluent and toxic metal discharge to water bodies (Linhares et al, 2013) [17]. Surveys found that fast growth of leather production from
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