Authors

Department of Environmental engineering (environmental pollutants), Islamic Azad University, Tonekabon Branch

Abstract

Heavy metals are highly poisonous in the environment, even in small quantities, and endanger certain species and all live beings. Current methods of removing heavy metals from aqueous media include chemical sequestration, ion exchange, surface absorption, membrane processes, oxidation and revival procedures which have high investment and exploitation costs. Hence, it is significantly necessary to develop new and economical methods for effective removal of these metals from water and sewage. The present paper aims to evaluate efficiency of microparticles in removing heavy metals from water. Results of application of hydroxy-apatite microparticles as absorbers of heavy metals show that the absorption percentage average of lead (84.72%) by hydroxy-apatite microparticles is greater than that of cadmium (49.89%), zinc (72.90%), iron (74.50%) and nickel (79.25%).

Keywords

Chong, A. M. Y.; Wong, Y. S.; Tam, N. F. Y., (2000). Performance of different microlgal species in removing nickel and zinc from industrial wastewater. Chemosphere 41, 251-257.
Liehr, S. K.; Chen, H. J.; Lin, S. H., (1994). Metal removal by algal biofilms. Water Sci., Technol., 30 (11), 59-68.
Matheical, J. T.; Yu, Q., (1996). Biosorption of  lead from aqueous solutions by marine algae Ecklonia radiate. Water Sci., Technol, 34 (9), 1-7.
Fergusson J. E., (1990). The Heavy Elements: Chemistry, Environmental Impact, and Health Effects. Newzealand, Pergamon Press, 431.
Ahluwalia, S. S.; Goyal, D., (2007). Microbial and plant derived biomass for removal of heavy metals from wastewater. 98 (12), 2243-2257.
Malik, A., (2004). Metal bioremediation through growing cells. Environment International. 30 (2), 261-278.
Volesky, B.; Schiewer S., (2000). Biosorption, Metals. Encyclopedia Of Bioprocess Technology. (Fermentation, Biocatalysis and Bioseparation)1, 433-453.
McEldowney, S. H.; Hardman, D. J., (1993). Polution: ecology and biotreatment. Longman group Ltd.
Eckenfelder, W.W., (2000). Industrial Water Polution Control. 3rd Eddition, McGraw-Hill, Boston, MA.
Zhang, Z.; Zeng, G. M.; Huang, J. H.; Fang, Y. Y.; Xu, K.; Qul, Y. H.; Yang Ch. P.; Li, J. B., (2007). Removal of zinc ions from aqueous solution using micellar-enhanced ultrafiltration at low surfactant concentrations. Water research commission 33.
Kurniawan, T. A.; Chan, G. Y. S.; Loa, W. H.; Babel, S., (2006). Physico-chemical treatment techniques for wastewater laden with heavy metals. Chemical Engineering Journal, 118, 83-98.
Kim, H.; Baek, K.; Leec J.; Iqbala, J.; Yang, J. W., (2006). Comparison of separation methodes of heavy metal from surfactant micellar solutions for the recovery of surfactant. Desalination. 191, 186-192.
Omar, W.; Al-Itawi, H., (2007). Removal of Pb2+ Ions from Aqueous Solutions by Adsorption on Kaolinite Clay. A. J. of Appl.Sci., 4 (7), 502-507.
Takeuchi, Y.; Arai, H., (1990). Removal of coexisting Pb2+, Cu2+,Cd2+ ions from water by addition of  hydroxyapatite powder.  J.Chem. Eng. Jpn., 23, 75-80.
Elliott, J. C., (1994). Structure and Chemistry of the Apatites and Other Calcium Orthophosphates. Elsevier, Amsterdam.
Tanaka, H.; Futaoka, M.; Hino, R.; Kandori, K.; Ishikawa, T., (2005). Structure of synthetic calcium hydroxyapatite particles modified with pyrophosphoric acid. J. Colloid Interf. Sci., 283 (2),
609-612.
Krestou, A.; Xenidis, A.; Panias, D., (2004). Mechanism of aqueous uranium (VI) uptake by a natural zeolite tuff. Miner. Eng., 16 (12), 1363-1370.
Czerniczyniec, M.; Farias, S.; Magallanes,
J.; Cicerone, D., (2003). Arsenic (V) Adsorption onto Biogenic Hydroxyapatite: solution composition effects. Water Air Soil Pollute. 180, 75-82.
Vega, E. D.; Pedregosa, J. C.; Narda, G. E., (1999). Interaction of oxovanadium (IV) with crystalline calcium hydroxyapatite: surface mechanism with no structural modification. J. Phys. Chem.Solids., 60 (6), 759-766.