Removal of Oil and Cr(VI) from Wastewater Using Modified Pectin Flocculants
Publication: Journal of Environmental Engineering
Volume 140, Issue 2
Abstract
This study examined the effects of pH, dosage, and stirring time on the removal of oil and Cr(VI) from simulated wastewater by pectin obtained from citrus byproducts. After pectin modification by etherification and polyaluminum chloride (PAC) impregnation, the extract removed highly concentrated oil and Cr(VI) from wastewater. Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray diffraction were used to characterize the flocculants and confirm modification of the pectin. An orthogonal factorial experiment with factors of stirring time, dosage, and pH was used to optimize the conditions for contaminant removal by the modified pectin. The average removal rates were 79 and 77% for oil and Cr(VI), respectively. A central composite design with factors of PAC, zinc sulfate (), pH, and microwave irradiation time showed that PAC and intensified the flocculation effect. The actual optimum removal rates for oil and Cr(VI) were 95.0 and 98.4%, respectively. Binomial regression adequately predicted the experimental results.
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Acknowledgments
This work was financially supported by Key Projects in the National Science and Technology Pillar Program during the Eleventh Five-Year Plan Period (2010BAD03B03), and by the National Undergraduate Innovation Program (201210635020).
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© 2013 American Society of Civil Engineers.
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Received: May 17, 2013
Accepted: Oct 3, 2013
Published online: Oct 5, 2013
Published in print: Feb 1, 2014
Discussion open until: Apr 8, 2014
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