Utilization of pulp and paper industrial wastes to remove heavy metals from metal finishing wastewater |
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Authors: | Suthipong Sthiannopkao Siranee Sreesai |
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Institution: | aInternational Environmental Research Center, Gwangju Institute of Science and Technology, 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea;bDepartment of Environmental Health Science, Faculty of Public Health, Mahidol University, Bangkok 10400, Thailand |
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Abstract: | Two pulp and paper industrial wastes, lime mud (LM) and recovery boiler ash (RB), have low moisture contents, low heavy metal contaminations and contain various carbonate compounds which contribute to a high pH. Metal finishing wastewater (MF-WW) has a low pH, high levels of TDS and high contaminations from Cr, Cu, Pb and Zn. The heavy metals from MF-WW were removed by sorption and precipitation mechanisms. LM gave better results in removing heavy metals from MF-WW than RB. At a reaction time of 45 min, the maximum removal efficiencies for Cr (93%) and Cu (99%) were obtained at 110 g L−1 of LM, but at 80 g L−1 for Pb (96%) and Zn (99%). Treatment with LM gives a higher sludge volume than with RB. However, the leachability of heavy metals from LM is lower. Leachability of heavy metals in the sediment for all selected treatment conditions is within government standards. |
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Keywords: | Pulp and paper industrial wastes Metal finishing wastewater Heavy metals Removal efficiency Leachability |
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