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Research Paper | December 1, 2014

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Using natural adsorbents to reduce polycyclic aromatic hydrocarbons contamination of oily wastewater

Maryam Farahani, Azita Behbahaninia

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J. Bio. Env. Sci.5(6), 274-281, December 2014


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In recent years, an intensive research was conducted focusing on the selection of low-cost adsorbents which could be utilized as an alternative to the most widely used adsorbent in wastewater treatment activated carbon. This study was carried out to compare the adsorption of PAHs on rice bran, sawdust and activated carbon, and investigate the adsorption properties of them. We prepared a rectangular pilot plant with an interlaced plate as drainage at the end of it, and after packing it with each of the adsorbents in specific weight and height, oily wastewater containing polycyclic aromatic hydrocarbons (PAHs) influence on it. The column pressure head and its conditions have been stable during experiments. The adsorption of PAHs on these adsorbents was estimated by measuring the concentration of PAHs in effluences of the drainage every 15 min intervals up to 4 h, and the bed of adsorbents at the end of experiments. The results showed, Activated carbon and Rice bran attained the maximum of the adsorption (92.1%) and (91.5%) within 60 min, respectively. Also, the maximum PAHs adsorption on sawdust (88.5%) observed, after 30 min. Then, the mean concentration of PAHs was calculated per unit of the mass of adsorbents at the end of experiments and revealed; time is the effective factor on adsorption values. The adsorption coefficient was calculated as 0.187, 0.131and 0.114 on rice bran, sawdust and activated carbon, respectively.


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Using natural adsorbents to reduce polycyclic aromatic hydrocarbons contamination of oily wastewater

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