December 1, 2016 Thesis Open Access

Kidanu G/Selassie

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    "description": "<p>investigate the reduction process of hexavalent chromium from electroplating wastewater by<br>\nchemical precipitation in order to achieve the maximum trivalent chromium concentration.<br>\nSodium bisulphite is one of the widely used coagulants in waste water treatment process and has<br>\ngood reducing ability. Because of its reducing capacity, sodium bisulphite is applied to reduce<br>\nhexavalent chromium from electroplating wastewater. The study has been conducted in four<br>\nphases. In phase one reduction of hexavalent chromium, phase two determination of hexavalent<br>\nchromium, phase three precipitation of chromium sulphate followed by oxidation of the sludge<br>\nof Chromium (III) hydroxide. Phase one study was carried out to analyze the reduction process<br>\nof the toxic soluble hexavalent chromium by using the concept of design experiment to justify<br>\nthe number of affecting factors and levels during the laboratory work followed by the synthetic<br>\nwaste sample preparation at Homicho Ammunition Engineering Industry in Ambo.<br>\nDifferent experiments were considered like classical method of analysis to quantify and<br>\nqualify the wastewater sample, atomic absorption spectrophotometric technique was utilized to<br>\ndetermine the amount of total chromium, and finally colorimetric method to determine the<br>\namount of hexavalent chromium with a suitable complexing agent to engulf the ionic hexavalent<br>\nChromium. The total numbers of experiments were fifty four (54), the first twenty seven (27) run<br>\nwas analyzed by labeling the distributed parameters in each beaker of the solution and the<br>\nnumber of factors with their levels were indicated. For the purpose of optimization of the<br>\nselected parameters experiments were replicated, then at the second round of the experiment run<br>\nnumber 44 was the optimized one.</p>", 
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    "title": "Treatment and Recovery of Chrome from Electroplating Wastewater (By Chemical Precipitation) ( At Homicho Ammunition Engineering Industry)", 
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