Essay about Removal of Copper Contaminants Through Bacterial Adsorbents

Essay about Removal of Copper Contaminants Through Bacterial Adsorbents

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The increase in industrial, agricultural practices and several anthropogenic activities adds a significant amount of heavy metals in soil and water. Presence of these metals beyond threshold limit is toxic for the flora and fauna of the surroundings. So, there is a need for removing the harmful heavy metals from the environment. Several methods such as precipitation, evaporation, electroplating, ion exchange, membrane processes etc. have been developed for the decontamination of heavy metals from environment. These methods have several disadvantages like unpredictable metal ion removal, high reagent requirement, generation of toxic sludge and many more. To avoid such environmental problem, biosorption has been getting momentum for the removal of pollutants from aqueous medium and soil by the help of biosorbents (bacteria, algae, fungi, plants). Sometimes biosorbents are modified physically, chemically and genetically for the enhancement of their biosorption capacity. The mechanism of biosorption is affected by temperature, pH, bacterial activities and kinetics. This review paper describes the bacterial adsorbents, their modification and mechanism for removal of copper. By comparing previous studies it was observed that highest copper uptake was carried out by chemically modified Thiobacillusferroxidans (198.5 mg/g at pH 5.5 and temperature 30°C) and naturally occurring Pseudomonas putida (96.9 mg/g at pH 6.0 and temperature 37°C).
Keywords: Bioremediation, biosorption, adsorbent, bacteria, heavy metals, copper.

Introduction
Metals are inorganic form of pollutants which are added globally through military, mining, metallurgical, electroplating, metal finishing, agricultural processes and waste disposal. The extensive use of heavy ...


... middle of paper ...


...ynamic parameters of single andbinary mixture biosorption of lead (II) and copper (II) ions onto Pseudomonas putida: effect of temperature, J Hazard Mater, 135, 87-93 (2006).
30. Chen X C, Wang Y P, Lin Q, Shi J Y, Wu W X and Chen Y X, Biosorption of copper (II)and zinc (II) from aqueous solution by Pseudomonas putida CZ1, Colloids Surf B Biointerfaces, 46, 101-7 (2005).
31. Beolchini F, Pagnanelli F, Toro L and Veglio F, Ionic strength effect on copper biosorption by Sphaerotilusnatans: equilibrium study and dynamic modelling in membrane reactor, Water Res, 40, 144-52 (2006).
32. Ruiz-Manriquez A, Magana P I, Lopez V and Guzman R, Biosorption of Cu by Thiobacillusferrooxidans. Bioprocess Eng, 18, 113-8 (1997).
33. Liu H L, Chen B Y, Lan Y W and Cheng Y C, Biosorption of Zn(II) and Cu(II)by the indigenous Thiobacillusthiooxidans, ChemEng J, 97, 195-201 (2004).

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