Content Vol. 2 N 10, 2016
 

Pages 421 - 445


Study of binary adsorption of heavy metals Cu (II) and Co (II) contained in the model samples of wastewater by natural clay; Hicham Es-sahbany, Mohamed Berradi, Mustapha Belfaquir, Hakima Nassali, Mohamed Salahdine Elyoubi; Inter. J. Acad. Stud. 2(10):2016:421-431

Abstract:
In this present study, we studied the technique of binary adsorption of heavy metals namely; copper (Cu) and cobalt (Co) contained in models of wastewater samples. Adsorption was done using a natural adsorbent clay of chlorite-illitic of the region Had Kourt-Sidi Kacem-Morocco (CCI-HK-SKM). The mineralogical and spectroscopic characterization of this clay was carried out by the X-ray diffraction and X-ray fluorescence, and the binary adsorption of heavy metals (Cu (II) and Co (II)) by exploiting adsorption isotherms Langmuir and Freundlich. This was done in order to have a competitive adsorption of Cu2+ and Co2+ ions contained in the wastewater samples prepared at our laboratory LIMEMA. This technique was based on the main adsorption parameters namely; the mass of adsorbent, the initial contents of Cu2+ and Co2+ ions and the pH of the aqueous solutions prepared. The results obtained at optimum parameters of the binary adsorption of the studied heavy metals have been recorded successively in the values of  71% and 76% for the cobalt (Co (II)) and the copper (Cu (II)). According to the present results, it appears that the adsorption rate of copper the clay used in this work is higher than cobalt; this can be explained by the specified from the valence shell of each metal and also the specific surface of this for clay regarding heavy metals.

Key words:
Binary adsorption, Natural clay, Heavy metals, Mineralogical characterization.



Isolation and Identification of E. coli from Calf Diarrhea from Selected Dairy Farm in Holeta Oromiya Special Zone, Ethiopia; Zelalem Abera, Soressa Bekele, Lishan Asefa; Inter. J. Acad. Stud. 2(10):2016:432-445

Abstract:
Calf diarrhea is a multi factorial disease entity that can have serious financial and animal welfare implication in dairy farm and is one of the most common diseases reported in calves up to 3 months old. Among the bacterial causes of diarrhea in neonatal animals, E. coli is the most common and economically important one. The current cross sectional study was undertaken from November, 2015 to April, 2016 to isolate and identify E. coli from diarrheic calves aged up to 3 months from two selected dairy farm located in Holeta, Oromiya Special Zone, Ethiopia. Purposive type of sampling was made and 99 diarrheic calf samples were used in this study. Standard isolation techniques were used to identify the E. coli from diarrheic cases samples. Out of 99 fecal samples collected from diarrheic calves of different farm, 89 were positive for E. coli with the prevalence rate of 89.9%. The potential variables were sexes, body condition, blood level and sites. Prevalence rate of E. coli was observed based on sex groups of animals in which 86.3% and 93.8% were recorded in male and female’s calves, respectively. Higher prevalence rate was recorded in good body conditioned animals (95 %) as compared with medium (84.4 %) and poor (94.1%). Different rate of E. coli were recorded in two of them 92.3% and 81% in HARC and Bull-dam farms, respectively. A relatively high E. coli record was observed in HARC farm. There was great difference in prevalence rate among these blood groups that were 63, 90.6% and100% in 100%, 75%, and 50% blood groups, respectively. However, there were no respective variables found significantly associated with risk of occurrence of E. coli in diarrhea (P>0.05). Further epidemiological and microbiological studies on enteropathogens causing calf diarrhea to identify the serotype and virulent gene of the bacteria strongly recommended.

Key words:
Calf diarrhea, Dairy, E. Coli, Isolation, Holeta.


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