Recovery of Calcium Carbonate from Wastewater Treatment Sludge Using a Flotation Technique
|Jannie P. Maree1, Caliphs M. Zvinowanda1*, Munyaradzi Mujuru1, Regina M. Matsapola2, David J. Delport2 and Wynand J. Louw3|
|1Department of Environmental, Water & Earth Sciences, Faculty of Science, Tshwane University of Technology, Pretoria, South Africa|
|2Department of Chemical & Metallurgical Engineering, Faculty of Engineering & Inbuilt Environment, Tshwane University of Technology, Pretoria, South Africa|
|3Marlow Aquatec (Pty) Ltd, 50 Francis Street, Colbyn, Pretoria, South Africa|
|Corresponding Author :||Caliphs M. Zvinowanda
Department of Environmental Water & Earth Sciences
Faculty of Science, Tshwane University of Technology
Pretoria, South Africa
|Received March 19, 2012; Accepted April 21, 2012; Published April 23, 2012|
|Citation: Maree JP, Zvinowanda CM, Mujuru M, Matsapola RM, Delport DJ, et al. (2012) Recovery of Calcium Carbonate from Wastewater Treatment Sludge Using a Flotation Technique. J Chem Eng Process Technol 3:130. doi:10.4172/2157-7048.1000130|
|Copyright: © 2012 Maree JP, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.|
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The use of flotation technique for the recovery of calcium carbonate (CaCO3) from wastewater treatment sludge was investigated in this study. The parameters that were investigated included dosage of floating agents (sodium oleate and sunlight dish liquid) and the percentage solids of the slurry. The experiments were performed by floating sieved and un-sieved materials and CaCO3 was determined for both conditions as well as from tailings.
Initial CaCO3 analysis for the bulk material indicated that sieved and un-sieved materials had 63.4% and 32.9% CaCO3 content by weight respectively. The modification of pH was effected by dosing 1g NaCO3 to both 1000 g of sieved and un-sieved materials which was sufficient to raise the pH of the slurry to 9.5. A lower average recovery of 2.33% was observed on un-sieved material after using sodium oleate as a collector when compared to sunlight liquid of 31.6%. Therefore, it was concluded that for un-sieved material sunlight dishwashing liquid was a better collector compared to the latter. The results of this study proved that there is great potential of recovering commercial grade limestone from wastewater sludge.