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Removal of Oil and Cr( VI) from Wastewater Using Modified Pectin Flocculants

文献类型： 外文期刊

作者： Yang, Kun 1 ; Li, Yujing 1 ; Chen, Yucheng 1 ;

作者机构： 1.Southwest Univ, Coll Resources & Environm, Chongqing Key Lab Agr Resources & Environm, Chongqing 400715, Peoples R China

关键词： Oils;Wastewater management;Flocculation;pH;Modification;Oil;Cr(VI);Flocculation

期刊名称：JOURNAL OF ENVIRONMENTAL ENGINEERING （ 影响因子：1.6； 五年影响因子：1.8 ）

ISSN： 0733-9372

年卷期： 2014 年 140 卷 2 期

页码：

收录情况： SCI

摘要： 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 (ZnSO4), pH, and microwave irradiation time showed that PAC and ZnSO4 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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