Biosorption of heavy metals from waste water using Pseudomonas sp.

Abstract

Biosorption experiments for Cr(VI), Cu(II), Cd(II) and Ni(II) were investigated in this study using nonliving biomass of different Pseudomonas species. The applicability of the Langmuir and Freundlich models for the different biosorbent was tested. The coefficient of determination (R 2 ) of both models were mostly greater than 0.9. In case of Ni(II) and Cu(II), their coefficients were found to be close to one. This indicates that both models adequately describe the experimental data of the biosorption of these metals. The maximum adsorption capacity was found to be the highest for Ni followed by Cd(II), Cu(II) and Cr(VI). Whereas the Freundlich constant k in case of Cd(II) was found to be greater than the other metals. Maximum Cr(VI) removal reached around 38% and its removal increased with the increase of Cr(VI) influent. Cu(II) removal was at its maximum value in presence of Cr(VI) as a binary metal, which reached 93% of its influent concentration. Concerning to Cd(II) and Ni(II) similar removal ratios were obtained, since it was ranged between 35 to 88% and their maximum removal were obtained in the case of individual Cd(II) and Ni(II). *Corresponding authorThe presence of heavy metals in aquatic environments is known to cause severe damage to aquatic life, beside the fact that these metals kill microorganisms during biological treatment of wastewater with a consequent delay of the process of water purification. Most of the heavy metal salts are soluble in water and form aqueous solutions and consequently cannot be separated by ordinary physical means of separation.Physico-chemical methods, such as chemical precipitation, chemical oxidation or reduction, electrochemical treatment, evaporative recovery, filtration, ion exchange, and membrane technologies have been widely used to remove heavy metal ions from industrial wastewater. These processes may be ineffective or expensive, especially when the heavy metal ions are in solutions containing in the order of 1-100 mg dissolved heavy metal ions/L (Volesky, 1990a; Volesky, 1990b). Biological methods such as biosorption/ bioaccumulation for the removal of heavy metal ions may provide an attractive alternative to physico-chemical methods (Kapoor and Viraraghavan, 1995).

Evaluation of removal of heavy metals by microorganisms isolated from industrial effluents

“…When they are taken up by organism may cause adverse reaction in different organs and biological function, including reproduction and birth defects (Hobman et al, 1997;Hussein et al, 2004). The physico-chemical techniques such as incineration, ion exchange, filtration, chemical precipitation, adsorption membrane separation and reverse osmosis are available for removal of heavy metal (Pandit, et al, 2013).…”

Biosorption of Mercury onto Protonated Pistachio Hull Wastes – Effect of Variables and Kinetic Experiments

“…Numerous methods are practised in order to treat the metal contaminated effluent such as precipitation, ion exchange, electrolysis, separation by membrane, adsorption, etc. The method of wastewater treatment is selected according to the concentration of the waste and the cost of treatment [3]- [5].…”

Evaluación analítica para la determinación de aluminio, bario y cromo en aguas, por espectroscopia de absorción atómica con llama óxido nitroso-acetileno

“…El incremento de uso de metales y sustancias químicas en los procesos industriales ha resultado en la generación de grandes cantidades de efluentes acuíferos que contienen altos niveles de contaminantes orgánicos e inorgánicos (Hussein, Ibrahim, Kandeel, & Moawad, 2004). Se sabe que la presencia de metales pesados en el ambiente causa severos daños a la vida acuática, además de que elimina microorganismos durante los tratamientos biológicos de aguas residuales, lo que, a su vez, ocasiona que el proceso de purificación decaiga.…”

“…Se sabe que la presencia de metales pesados en el ambiente causa severos daños a la vida acuática, además de que elimina microorganismos durante los tratamientos biológicos de aguas residuales, lo que, a su vez, ocasiona que el proceso de purificación decaiga. Aunado a lo anterior, las sales de estos metales pesados son solubles en agua y, en consecuencia, no pueden ser separadas por métodos ordinarios (Hussein et al, 2004;Sarabia, 2011).…”