Study on removal of cadmium from water by bacterial biomass in biological silicious filter - Journal of Mazandaran University of Medical Sciences
Volume 13, Number 40 (Sep 2003)                   J Mazandaran Univ Med Sci 2003, 13(40): 17-26 | Back to browse issues page


XML Persian Abstract Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Deyanati tilki R, Shariat M. Study on removal of cadmium from water by bacterial biomass in biological silicious filter . J Mazandaran Univ Med Sci. 2003; 13 (40) :17-26
URL: http://jmums.mazums.ac.ir/article-1-783-en.html

Abstract:   (7741 Views)
Background and purpose: Studies show that surface or subsurface water in some areas near to the pollutant sources, to an extent higher than the permisible potable limit are contaminated with cadmium. There are different reports about biological absorption of cadmium in high concentrations (present in industrial effluents) by bacterial biomass, but there is less report about removing of low concentrations cadmium (present in the contaminated water resources) with the above mentioned method. Âim of this study was to determine cadmium adsorption isotopes (0.2 to 5 mg/liter) by bacterial biomass, pH effects, biomass concentration on absorption isoterms, and also to determine efficiency rate of silicious containig column having adhered biomass to remove cadminum from water.
Materials and methods: Çadmium absorption isoterms determined by biomass at different pH, corresponded ÂSTM method. Ëffect of biomass concentration on the rate of cadmium absorption on the unit of biomass weight (q), rate of cadmium absorption by fresh and nonfresh biomass, and also rate of cadmium deabsorption from biomass due to contact with distilled water were determined. Breakthrough curves related to the water containing cadmium for concentration of 0.5 mg/liter at emply bed contact time (ËBÇT) for 15 and 30 minutes was plotted.
Results : With increase in initial concentration of cadmium, rate of its absorption on the weight unit of biomass (q) was high, but removing efficiency declined. Âbsorption of cadmium on bacterial biomass corresponded the first grade synthetic equilibrium. With increase in concentration of biomass, absorption rate of cadmium on the weight unit of biomass (q) declined. Ïncrease in pH caused acceleration of cadmium absorption. Rates of cadmium absorption by fresh biomass and non fresh biomass were nearly the same. Rate of cadmium absorption from biomass due to contact with distilled water was obtained. For 0.5 mg/liter concentration of cadmium, at the remaining times of 15 and 30 minuts. of breakthrough after passing of water were 40 and 85 folds volum of empty bed respectively.
Çonclusion: Çadmium absorption by biomass is generaly physical and corresponds the first grade synthetic.
Full-Text [PDF 484 kb]   (1394 Downloads)    
Type of Study: Research(Original) |

Add your comments about this article : Your username or email:
Write the security code in the box

© 2015 All Rights Reserved | Journal of Mazandaran University of Medical Sciences

Designed & Developed by : Yektaweb