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Title: Heavy Metal Removal from Paint Industries Wastewater Using Wood Ash as an Adsorbent (A Case of Zemilli Paint Factory)
Authors: Biruk, Tsegaye
Advisors: Dr. Ing. Belay Woldeyes
Keywords: Adsorption
paint waste water
atomic adsorption spectrometer
wood ash
heavy metal
Copyright: Jun-2011
Date Added: 4-May-2012
Publisher: AAU
Abstract: Wastewater generated from Zemilli Paint Factory creates a wastewater that has a potential hazard to the environment by introducing various contaminants such as heavy metals into soil and water resources. The adsorption characteristics of Co2+ and Pb2+ ions found in waste water onto a wood ash surfaces were investigated with respect to changes in the pH of solution, adsorbent dose and contact time. The aim of this work was to evaluate the fundamental aspects of sorption of Pb (II) and Co (II) metal species using wood ash. Batch adsorption experiments were carried out in order to evaluate the metal uptake and to optimize condition of the adsorption. The optimized value of pH, adsorbent dosage and contact time were obtained. The results revealed that removal of 94% for cobalt at a pH of 8, 20gm/l adsorbent dose and 90 minute contact time was obtained; and 97% removal of lead is obtained at a PH of 10, 20 gm/l adsorbent dose and 90minute contact time. pH of Sample is adjusted to the required level by using 1M HCl and NaOH solution. Pb uptake increases with an increased with pH and became maximum at a pH of 10. But, uptake of Co best achieved at pH 8. Adsorbent dose affect uptake of both metal ions positively; and contact time gets equilibrium at 90 min of contact (shaking) time. The Langmuir isotherm was demonstrated to provide the best correlation for the adsorption of lead and cobalt on to wood ash. Based on the result the pseudo second-order kinetic model provided the best correlation of the experimental data. In the desorption study the cationic forms of heavy metals were first complexes with a Na2EDTA in order to recover water-soluble polymers and to obtain a heavy metal complexes with EDTA. This desorption study revealed that, the higher desorption efficiencies of up to 90% for Co2+ and up to 78% for Pb2+ was o achieved by using the solution of Na2EDTA at Temperature of 30 C, 2 hour mixing time, solid to liquid ratio of 5 and 2M Na2EDTA as Desorption solution. The adsorption column was designed using different parameters for Zemilli Paint Factory waste water and on the basis of the results obtained from the experiment, by using such necessary data; also size the dimensions of the adsorption column. Wood ash is an abundant resource in every part of the country; it is recommended that, wood ash can effectively be applied as an absorbent for the removal of Co (II) and Pb (II) ions from paint waste water.
URI: http://hdl.handle.net/123456789/2464
Appears in:Thesis - Environmental Engineering

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