Showing papers by "Adama University published in 2008"
TL;DR: In this article, two pass and three pass bead-over-bead (BoB) electron beam weld technique was attempted on Ti6Al4V to improve its Charpy impact and fracture toughness of weld metal portion.
61 citations
TL;DR: Tannery sludge derived activated carbon exhibits dye removal efficiency that is about 80-90 % of that observed with commercial coal based activated carbon as mentioned in this paper, which is the most widely used adsorbent for the removal of dyestuffs from dyeing industry effluents.
Abstract: Effective treatment of dyestuff containing textile dyeing industry effluents require advanced treatment technologies such as adsorption for the removal of dyestuffs. Powdered commercial coal based activated carbon has been the most widely used adsorbent for the removal of dyestuffs from dyeing industry effluents. As an alternative to commercial coal based activated carbon, activated carbon prepared from dried tannery sludge was used as an adsorbent for dyestuff removal from simulated textile dying industry effluent in this study. The color removal performance of tannery sludge derived activated carbon and commercial coal based activated carbon has been investigated using parameters such as adsorbent dosage, initial dye concentration, pH and temperature. It was found that tannery sludge derived activated carbon exhibits dye removal efficiency that is about 80–90 % of that observed with commercial coal based activated carbon. The amount of dye adsorbed on to tannery sludge derived activated carbon is lower compared with commercial activated carbon at equilibrium and dye adsorption capacity increased with increase of initial dye concentration and temperature, and deceasing pH. It was found that the Langmuir isotherm appears to fit the isotherm data better than the Freundlich isotherm. The leachate of heavy metals from tannery sludge derived activated carbon to the environment is very low, which are within the standard limit of industrial effluent and leachable substances. KEY WORDS: Adsorption, Tannery sludge derived activated carbon, Commercial coal based activated carbon, Adsorption isotherms, TCLP Bull. Chem. Soc. Ethiop. 2008 , 22(3), 369-378.
17 citations