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Showing 3 results for Vaezi
Dr A.h Mahvi, Mr J Ebrahimi, Dr J Nouri, Dr F Vaezi, Mrs L Ebrahimzadeh,
Volume 12, Issue 2 (Scientific Journal of Kurdistan University of Medical Sciences 2007)
Abstract
Background and Aim: Although primary and secondary treatment processes when completed by disinfection can remove 85% of both BOD, SS and inactivate nearly all of the pathogenic microorganisms, few pollutants such as soluble COD, nitrogen, phosphorus, and heavy metals are not completely removed from effluent. This may be regarded as a cause of trouble when larger volumes of these effluents are discharged into a small flow or a sensitive ecosystem.�The aim of this study was to determine the efficiency of electrolysis process in removal of phosphorus from the wastewater effluent of treatment plants. Materials and Methods: This was an experimental study carried out by establishing a pilot reactor in the laboratory of water and wastewater microbiology of the school of public health (TUMS). The capacity of this reactor was 20 liters. The reactor was put into operation under different conditions of influent flows, electrical potentials and pollutants concentrations. In all of these experiments, flow was continuous. Results: All plates embedded in anode pole as a flocculating agent, revealed a 90% removal of phosphorous. Conclusion: The future of electrolysis process for removal of phosphorous and other similar pollutants from effluents will be promising. Application of this technology can lead to a much more perfect and economical wastewater treatment with no (or less) sludge production and a favorable environmental health condition
Hosein Miladi Gorji, Dr Abas Ali Vafaie, Dr Abas Ali Taherian, Tahmineh Vaezi,
Volume 13, Issue 2 (Scientific Journal of Kurdistan University of Medical Sciences 2008)
Abstract
ABSTRACT
Background and Aim: Melissa officinalis (MO) grows in the different parts of Iran abundantly. In previous studies, the extract of MO has been reported to have antinociceptive and anticonvulsive effects in rats. This study was designed to evaluate the effect of different doses of the aqueous decoction extracts of MO on withdrawal syndrome in rats.
Material and Methods: 40 male albino rats (25-30 gr) were selected for this study. Morphine was used to produce drug dependency by Marshall method (injection of 10 doses of drug in four days). 30 min before injection of naloxone (2 mg/kg), different doses of the extract (5, 10, 25 mg/kg) were injected intraperitoneally and saline (10ml/kg IP) was injected into the rats of control group. Assessment of classic withdrawal syndrome was based on the number of jumps and the weight of the fecal material for every rat.
Results: The results of this study indicated that injection of doses of 10, 25 mg/kg of the extract led to a significant decrease in the number of Jumps (p=0.005) and also in the weight of feces of the rats (p=0.01).
Conclusion: We conclude the aqueous extract of MO can have an important role in the reduction of the severity of withdrawal syndrome in rats.
Key words: Aqueous decoction extracts, Melissa officinalis, Withdrawal syndrome, Morphine, Naloxone.
Conflict of Interest: Nill
Received: December 8, 2007 Accepted: May 17, 2008
Alireza Asgari, Amir Hosein Mahvi, Foroogh Vaezi, Azar Ghasri,
Volume 13, Issue 2 (Scientific Journal of Kurdistan University of Medical Sciences 2008)
Abstract
ABSTRACT
Background and Aim: The pollution of water resources with arsenic (As) is considered as a serious problem and there are several reports about pollution of superficial and underground water with arsenic, in particular arsenate and arsenite in our country specially in some areas of Kurdistan province. There are various methods for removal of arsenic from drinking water which are generally costly.
Material and Methods: In this study, granular ferric hydroxide (GFH) was used as a synthetic adsorbent for removal of arsenate and arsenite with concentrations of 0.5, 1.0 and 2.0 mg/L. The effects of changing contact time, pH and concentrations of competitive anions, concentration of iron added to water during removal of arsenic and the effect of sulfate and chloride ions on removal of arsenic and compatibility of adsorption with Ferundlinch and Langmuir equations were evaluated. Excel soft ware was used for data analysis.
Results: According to this study, GFH showed removal efficiencies of 95, 86.5 and 83.75 for arsenate and 91, 83.5 and 80 percent for arsenite (in initial concentrations of 0.5, 1 and 2 mg/L and at a PH of 7.5). The dosage of adsorbent for this treatment was 0.5 g/L and 30 minutes was required for contact time. SO42- and Cl- revealed no significant effect on removal of arsenic. Adsorbability of both arsenate and arsenite by GFH followed Ferundlich isotherm with R2=0.96, whereas arsenate adsorption (with R2 value of more than 0.94) complied more with Langmuir isotherm in comparison to arsenite adsorption (with R2 value of more than 0.92). Results of our study also indicated that the amount of iron added to water was much more than the standard value of 0.3mg/L used for dinking water.
Conclusion: The results of our study showed GFH is highly efficient in removal of arsenate and arsenite after modification of water PH, but it has disadvantages of addition of iron to water, need of import of GFH and high cost. The problem of addition of iron to water can be managed by traditional methods.
Key words: Drinking water, Arsenate, Arsenite, Granular Ferric Hydroxide, Adsorption.
Conflict of Interest: Nill
Received: March 27, 2008 Accepted: July 24, 2008
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