Thesis Open Access

ADSORPTION OF LEAD AND COPPER FROM INDUSTRIAL WASTE WATER USING ONION SKINS A CASE STUDY OF AYKA ADDIS TEXTILE AND INVESTMENT GROUP

SIMENEH GIZAW BELETE


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    <subfield code="a">SIMENEH GIZAW BELETE</subfield>
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    <subfield code="a">&lt;p&gt;Textile industries are among industries which release large amount of waste which contains hazardous heavy metals. Heavy metals such as lead, chromium, cadmium and copper are widely used for the production of color pigments of textile dyes. Textile pollutant dyes are released to the environment at various stages of operation. Therefore, there is a need to find an economical method to remove pollutants. This study evaluated the efficiency and capacity of onion skin on the adsorption of lead and copper ions from Ayka Addis textile industry waste water. Batch experiments were carried out to optimize adsorption parameters and to evaluate the metal uptake from synthetic waste water prepared from lead nitrate and copper sulphate. The adsorption was studied at different adsorption parameters, namely; pH, contact time, initial metal ion concentration and adsorbent dose. It was found that the optimum PH for copper was 6 and that of lead was 5, initial metal ion concentration 50 mg/L, adsorbent dose 1 gram, contact time 30 minute. In the optimum condition the removal efficiency of onion skin on the adsorption of lead and copper from synthetic waste water were 98.9% and 95.9% and from real waste water were 80.2% and 78.9% respectively. The Freundlich adsorption isotherm model fitted well with the experiment data for both metals. The results indicate that the adsorption of Pb+2 and Cu+2 takes place by multilayer adsorption on a heterogeneous surface of the adsorbent. From the experimental results, it can be concluded that onion skin is a potential adsorbent for the removal of lead and copper ion in textile industry wastewater&lt;br&gt;
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    <subfield code="a">ADSORPTION OF LEAD AND COPPER FROM INDUSTRIAL WASTE WATER USING ONION SKINS A CASE STUDY OF AYKA ADDIS TEXTILE AND INVESTMENT GROUP</subfield>
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    <subfield code="a">Adsorption, onion skin, removal efficiency, adsorption isotherm</subfield>
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    <subfield code="a">Assefa Sergawie(PhD)</subfield>
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