Journal of Rafsanjan University of Medical Sciences
Journal of Rafsanjan University of Medical Sciences
1735-3165
5
1
2006
6
1
Comparison between the Pain-Relief Effect of Fennel and Mefenamic Acid on Primary Dysmenorrhea
1
6
FA
V.
Modaress Nejad
B.
Motamedi
M.
Asadi pour
Journal of Rafsanjan University of Medical Sciences
Journal of Rafsanjan University of Medical Sciences
1735-3165
5
1
2006
6
1
The Calculation of Absorbed Dose from 131I Radioactive Source in Thyroid Using MCNP Code for Spherical and Cylindrical Fields
7
10
FA
AA.
Mowlavi
AR.
Binesh
Journal of Rafsanjan University of Medical Sciences
Journal of Rafsanjan University of Medical Sciences
1735-3165
5
1
2006
6
1
Evaluation of the Effects of Cobalt-60 Gamma Radiation on Budding of Triticum aestivum Seeds
11
16
FA
MA.
Hosseinpour-feizi
P.
Azarfam
S.
Yazdchi
Sh.
Jabbary
B.
Passebany
H.
Mohajjel-Shoja
Journal of Rafsanjan University of Medical Sciences
Journal of Rafsanjan University of Medical Sciences
1735-3165
5
1
2006
6
1
Evaluation of Fragile X Syndrome in Patients with Moderate Mental Retardation in Rafsanjan City
17
22
FA
MR.
Mirzaei
GR.
Asadi Karam
M.
Mahmoodi
MR.
Hajizadeh
M.
Musavi
AR.
Sayadi
S.H.
Hosseini
Journal of Rafsanjan University of Medical Sciences
Journal of Rafsanjan University of Medical Sciences
1735-3165
5
1
2006
6
1
The Prevalence of HIV, HBV and HCV in Narcotic addicted Persons Referred to the out Patient Clinic of Rafsanjan University of Medical Sciences in 2003
23
30
FA
A.
Khodadadi zadeh
A.
Esmaeili Nadimi
S.H.
Hosseini
Z.
Shabani shahrbabaki
Journal of Rafsanjan University of Medical Sciences
Journal of Rafsanjan University of Medical Sciences
1735-3165
5
1
2006
6
1
Comparison between the Effect of Medical Training Therapy and Stability Exercises on Functional Lumbar Instability
31
36
FA
F.
Bahrpeyma
Journal of Rafsanjan University of Medical Sciences
Journal of Rafsanjan University of Medical Sciences
1735-3165
5
1
2006
6
1
Changes in Blood Pressure and ECG Indices in Males Living Around Ravar, Feyz – Abad Lead Mine
37
44
FA
M.
Abbasnegad
A.
Abbasnegad
A.
Afarinesh
Journal of Rafsanjan University of Medical Sciences
Journal of Rafsanjan University of Medical Sciences
1735-3165
5
1
2006
6
1
The Removal of Chromium from Tannery Industries Effluent
Using Aspergillus niger
45
50
OTHER
Background and Objective: Tannery industries effluent contain 100-1000 mg/L Cr+3 and due to changing to Cr+6, its direct disposal into environment is potentiqlly hazardous and threaten the health of humans through contaminating to the environment. In the recent years, many studies have been carried out concerning the removal of heavy metals from synthetic effluent using fungi and algae. The aim of this study as a basic and applied, investigation is to assess the possibility of the growth of Aspergillus niger in tannery effluent and its role in removal of Chromium from these industrial wastes.
Materials and Methods: Firstly the chemical quality of tannery effluent was assessed through measuring Cr3+, total organic Carbon (TOC), total kadjeldal Nitrogen (TKN), Phosphate and pH (based on the latest standard methods for examinations of water and waste water). The ratio of carbon to nitrogen was adjusted to the optimal rate (C/N=10) prior to inoculation of 0.04-0.24% (dry weight) of A.niger into the effluent samples contained 122.5-1102.5mg/L of initial chromium. The samples were placed in a shaking incubator at 300C, 150 rpm for 24 h. The rate of fungi biomass growth, the ratio of the grown fungi biomass to the chromium concentration and the percentage of chromium removal were then determined.
Results: Findings of this experiment showed that the rate of fungi growth was increased in effluent that was initially contained 122.5 -1102.5 mg/L of Cr+3. However, effluent containing more than 1102.5 mg/L was able to stop the fungi growth. The best values of chromium removal (93.4% was observed at the initial concentration of 245mg/L (dry weight). Also the rate of biomass growth and the ratio of grown biomass to the chromium concentration were 0.4407 % and 18 mg/mg Cr+3, respectively.
Conclusion: A.niger has an optimal growth in the tannery effluent at the chromium concentration of 122.5–245 mg/L. Analysis of variance showed that the initial concentration of chromium in effluent and/or the amount of inocalm have a significant effect on the rate of biomass growth and chromium removal efficiency (p<0.001).The chromium removal efficiency and the ratio of fungi biomass to chromium concentration decreases when the concentration of chromium is higher than 245mg/L.
Key words: Tannery industries, Aspergillus niger, Chromium removal
Journal of Rafsanjan University of Medical Sciences
Journal of Rafsanjan University of Medical Sciences
1735-3165
5
1
2006
6
1
The Effect of Cold on the Strength of Anterior Forearm Muscles
51
56
FA
N.
Tahan
Kh.
Khademi Kalantari
Gh.
Nasaj