Predicting chromium (VI) adsorption rate in the treatment of liquid-phase oil-based drill cuttings

The adsorption rate of chromium (VI) on commercial activated carbon during the treatment of the flocculation effluent of liquid-phase oil-based drill-cuttings has been investigated in terms of contact time and initial chromium (VI) ion concentration. Homogenizing 1 g of the activated carbon with 100 ml of the flocculation effluent of known initial concentrations (1.25 → 6.25 mg/l, in turn) in a flask, at a constant stirring speed of 80 rpm at 25 o C for 180 min, the pseudo-second-order kinetics was observed to be more suitable in predicting the adsorption rate of chromium (VI) ion in the treatment process as experimental data fitted the model relatively better than the pseudo-first-order kinetics with R 2 = 0.9999. Adsorption took place in two steps: an initial high rate step before reaching a plateau at equilibrium in the low rate step. Equilibrium was attained in a contact time of 60 min and the equilibrium adsorption capacity of the activated carbon was 78.6%. Equilibrium adsorption data fitted the Freundlich isotherm well with R 2 = 0.981. The intensity of adsorption was 1.32, which indicates a strongly favourable adsorption. This showed that a large proportion of the chromium (VI) ion was adsorbed at low concentration of the adsorbate in solution. Key words : Carbon adsorption, kinetic models, drill cuttings, chromium removal.

[1]  A. Özcan,et al.  Adsorption kinetics of naphthalene onto organo-sepiolite from aqueous solutions , 2008 .

[2]  J. Huot.  Kinetics and Thermodynamics , 2008 .

[3]  J. C. Igwe,et al.  Equilibrium sorption isotherm studies of Cd(II), Pb(II) and Zn(II) ions detoxification from waste water using unmodified and EDTA-modified maize husk , 2007 .

[4]  Stephen Ogaji,et al.  Chromium removal from flocculation effluent of liquid-phase oil-based drill-cuttings using powdered activated carbon , 2007 .

[5]  S. Popuri,et al.  Biosorption of hexavalent chromium using tamarind (Tamarindus indica) fruit shell-a comparative study , 2007 .

[6]  Runping Han,et al.  Biosorption of methylene blue from aqueous solution by fallen phoenix tree's leaves. , 2007, Journal of hazardous materials.

[7]  K. Parvathi,et al.  Lead biosorption onto waste beer yeast by-product: a means to decontaminate effluent generated from battery manufacturing industry , 2007 .

[8]  S. Ismadji,et al.  Improved Adsorption Capacity of Commercially Available Activated Carbon Norit ROW 0.8 Supra with Thermal Treatment for Phenol Removal , 2007 .

[9]  B. Yao,et al.  Kinetics and thermodynamics study of lead adsorption on to activated carbons from coconut and seed hull of the palm tree , 2007 .

[10]  M. Abedin,et al.  ADSORPTION OF PHENOL FROM AQUEOUS SOLUTION BY WATER HYACINTH ASH , 2007 .

[11]  K. Tsekova,et al.  Heavy Metal Biosorption sites in Penicillium cyclopium , 2006 .

[12]  A. Spiff,et al.  Sorption kinetics of Pb2+ and Cu2+ ions from aqueous solution by Nipah palm (Nypa fruticans Wurmb) shoot biomass , 2006 .

[13]  M. Romero,et al.  Biosorption of heavy metals by Talaromyces helicus: a trained fungus for copper and biphenyl detoxification , 2006 .

[14]  E. Asuquo.  Lead (II) and nickel (II) adsorption kinetics from aqueous metal solutions using chemically modified and unmodified agricultural adsorbents , 2006 .

[15]  Y. Ho.  Second-order kinetic model for the sorption of cadmium onto tree fern: a comparison of linear and non-linear methods. , 2006, Water research.

[16]  T. Ramachandra,et al.  Biosorption of chromium (VI) from aqueous solutions by the husk of Bengal gram (Cicer arientinum) , 2005 .

[17]  M. Otero,et al.  Activated carbons from sewage sludge and discarded tyres: production and optimization. , 2005, Journal of hazardous materials.

[18]  Saifuddin M. Nomanbhay,et al.  Removal of heavy metal from industrial wastewater using chitosan coated oil palm shell charcoal , 2005 .

[19]  E. Demirbas,et al.  Adsorption kinetics for the removal of chromium (VI) from aqueous solutions on the activated carbons prepared from agricultural wastes , 2004 .

[20]  S. Ibrahim,et al.  Biosorption of heavy metals from waste water using Pseudomonas sp. , 2004 .

[21]  E. S. Cossich,et al.  Biosorption of chromium(III) by Sargassum sp. biomass , 2002 .

[22]  E. S. Cossich,et al.  BIOSORPTION OF CHROMIUM (III) BY SARGASSUM SP , 2002 .

[23]  L. F. Calvo,et al.  Upgrading sewage sludges for adsorbent preparation by different treatments. , 2001, Bioresource technology.

[24]  K W Kolasniski,et al.  ZUR THEORIE DER SOGENANNTEN ADSORPTION GELÖSTER STOFFE. KUNGLIGA SVENSKA VETENSKAPSAKADEMIENS , 2001 .

[25]  Gordon McKay,et al.  The kinetics of sorption of divalent metal ions onto sphagnum moss peat , 2000 .

[26]  Y. Ho,et al.  Pseudo-second order model for sorption processes , 1999 .

[27]  Gordon McKay,et al.  The Sorption of Lead(II) Ions on Peat , 1999 .

[28]  T. Ramachandra,et al.  BIOSORPTION OF HEAVY METALS , 2003 .

[29]  Z. Aksu,et al.  A comparative study of various biosorbents for removal of chromium(VI) ions from industrial waste waters , 1994 .

[30]  A. E. Greenberg,et al.  Standard methods for the examination of water and wastewater : supplement to the sixteenth edition , 1988 .

[31]  M. Fraser.  25-27 September , 1956 .