Evaluation of Efficiency of Rice Bran in the Removal of Heavy Metals from Wastewater

Subject Areas : Environment Pullotion (water and wastewater)

soheil sobhan ardakani ¹ ( دانشیار گروه محیط‌زیست، دانشگاه آزاد اسلامی، واحد همدان )
hassan Parvizi mosaed ² ( Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran )
Razieh zandi pak ³ ( Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran )

Received: 2011-10-07 Accepted : 2012-01-11 Published : 2014-12-22

Keywords: Rice bran, chromium, Copper, Wastewater, Adsorption isotherm,

Abstract :

Rice bran, as an organic solid waste material, has a high adsorption potential in removal of heavy metal ionsfrom wastewater and can be very effective in treating the industrial wastewater which is the main source of waterand soil contamination with heavy metals. In this study, the efficiency of Cr(III) and Cu(II) removals from heavymetals containing solutions was evaluated. Afterwards by adding rice bran to reaction environment, the amountof metal ions removed by rice bran in acidities, amount of adsorbent used, contact times and different initialconcentrations of ions in wastewater were investigated. The results indicated that with an increase in the solutionpH, the percentage heavy metal ions adsorption by rice bran increased and reach the amount maximum in pH=5.Also, percentage of adsorption was dependent on metal type, so that percentages of Cr(III) and Cu(II) adsorptionfrom wastewater were 84.2% and 89.5% in pH=5, respectively.To increase the wastewater initial concentration,first percentage of adsorption was increased and then it was decreased due to saturation of rice bran particles.According to the obtained results, the calculated saturation capacities of rice bran for Cr(III) and Cu (II) were 71and 78 mg/g-1 respectively. Moreover, percentage of ions adsorption was increased with the increase of contacttime. Due to rapid reaction, 50-60% of metal ions was adsorbed after 5 min from start of reaction. In this study,contact time of 30 min was offered as an appropriate contact time. The experimental data were analyzed usingthe Langmuir and Freundlich models of adsorption. Equilibrium data fitted well with the Langmuir model.

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