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Articles by A. Rezaee
Total Records ( 11 ) for A. Rezaee
  S.B. Mortazavi , A. Nikpey , A. Rezaee , H. Asilian , A. Khavanin and H. Kazemian
  Methyl tert-butyl ether (MTBE) is added to reformulated gasoline to meet the 1990 Clean Air Act directives. Widespread use of MTBE in gasoline has resulted in groundwater contamination. Because of its undesirable effects on drinking water and ecologically harmful effects, MTBE removal has become a public health and environmental concern. In this study, we have isolated a mixed bacterial culture which is capable of degrading the MTBE as a sole carbon and energy source. This consortium was developed from mixed urban and petrochemical activated sludge after 4 month's enrichment. Enrichment was conducted in batch reactor, fitted with a screw cap and butyl rubber septum. MTBE concentration was measured in head space by gas chromatography. Degradation was determined by MTBE removal. MTBE biodegradation was depended to Dissolved Oxygen (DO) concentration and not affected by the changes in concentration of trace element solution or other stimulator Substances. Degradation rates were nearly 1.478 mg MTBE h¯11 (wet biomass) and didn’t change with MTBE concentration (up 500 mg L¯1).
  A. Rezaee , J. Derayat , S.B. Mortazavi , Y. Yamini and M.T. Jafarzadeh
  In this study, the removal of mercury ions by cellulose of Acetobacter xylinum was investigated in the synthetic and chlor-alkali wastewater. Biofilms of Acetobacter xylinum were grown in laboratory column bioreactors. The biofilms were continuously treated with sterile synthetic model wastewater or nonsterile, neutralized chloralkali wastewater.The extent of adsorption was studied as function of pH, adsorbent dose and contact time. Efficiency of mercury ion removal from chlor-alkali industry wastewater by aluminum sulfate and ferric chloride was also determined. Under acidic condition the adsorption of mercury by cellulose was quite low and increasing processing time more than10min has no remarkably effect on the adsorption rate. Adsorption capacity of cellulose under dynamic condition for chlor-alkali wastewater was 65μg/g which was less than the value (80μg/g) that obtained from batch adsorption experiments for synthetic wastewater.
  A. Rezaee , M. Ansari , A. Khavanin , A. Sabzali and M.M. Aryan
  The design and operation of wastewater treatment systems for hospital is a challenge for wastewater engineers. In this study, a pilot-scale system integrated anaerobic-aerobic fixed film reactor for hospital wastewater treatment was constructed and its performance was evaluated. The aim of the study was the elimination of organic compounds and a significant reduction of bacteria. The system had been operated for 90 days. The results show that the system efficiently removed 95.1% of the chemical oxygen demand (COD) from a hospital wastewater with the influent COD of 700 mg L¯1, leaving 34 mg L¯1 COD in the effluent. The significant removal of pathogenic bacterial has been do after operating of the system. The advantages of the treatment system studied for small wastewater flows include: (I) simple operation and maintenance; (II) efficient removal of COD and bacteria; and (III) low-energy consumption.
  A. Rezaee , A. Khavanin and M. Ansari
  Work camps, have to be established quickly, are a transient nature and located in environmentally sensitive areas. Wastewater treatment systems located in the work camps often perform poorly. In response to these deficiencies and the need to provide for reliable, cost effective, high efficiency wastewater treatment, the research team designed a sequence batch reactor (SBR)/ sand filter system that is simple, compact, robust, easy to operate and produces a high quality effluent. The SBR/sand filter system is operated with varying organic loading rates and process performance is assessed by monitoring COD, BOD5, pH, volatile suspended solids, suspended solids and nitrate during the cycle operation. The process described, is a flexible, biologic, suspended growth system that can be operated in the conventional activated sludge or extended aeration mode.
  H. Asilian Mahabady , M. Omidvar , A. Rezaee , A. Khavanin and S. B. Mortazavi
  A Microsoft Windows based ventilation software package is developed to reduce time-consuming and boring procedure of exhaust ventilation system design. This program Assure accurate and reliable air pollution control related calculations. Herein, package is tentatively named Exhaust Ventilation Design Software which is developed in VB6 programming environment. Most important features of Exhaust Ventilation Design Software that are ignored in formerly developed packages are Collector design and fan dimension data calculations. Automatic system balance is another feature of this package. Exhaust Ventilation Design Software algorithm for design is based on two methods: Balance by design (Static pressure balance) and design by Blast gate. The most important section of software is a spreadsheet that is designed based on American Conference of Governmental Industrial Hygienists calculation sheets. Exhaust Ventilation Design Software is developed so that engineers familiar with American Conference of Governmental Industrial Hygienists datasheet can easily employ it for ventilation systems design. Other sections include Collector design section (settling chamber, cyclone, and packed tower), fan geometry and dimension data section, a unit converter section (that helps engineers to deal with units), a hood design section and a Persian HTML help. Psychometric correction is also considered in Exhaust Ventilation Design Software. In Exhaust Ventilation Design Software design process, efforts are focused on improving GUI (graphical user interface) and use of programming standards in software design. Reliability of software has been evaluated and results show acceptable accuracy.
  A. Rezaee , M. T. Ghaneian , A. Khavanin , S. J. Hashemian , Gh. Moussavi , Gh. Ghanizadeh and E. Hajizadeh
  In textile industry, advanced oxidation processes are used for degrading and removing color from dye baths which allow wastewater reuse. In this study, photochemical oxidation processes (UV-A/K2S2O8, UV-C/K2S2O8) and chemical oxidation process (dark/K2S2O8), were investigated in a laboratory scale photoreactor for decolorization of the Reactive blue 19 (RB19) dye from synthetic textile wastewater. The effects of operating parameters such as potassium persulphate dosage, pH, reaction time and UV source, on decolorization have been evaluated. The results of direct chemical oxidation showed that 50% of the dye was been removed using K2S2O8 in dark condition after 5h reaction time and photochemical oxidation showed that UV-C irradiation is more effective than UV-A for RB19 dye removal. The RB19 solution was completely decolorized under optimal potassium persulphate dosage of 5mmol/L and low-pressure mercury UV-C lamps (15w) in less than 30min. UV/K2S2O8 experiments showed higher color removal performance under acidic conditions (pH=3), and in this condition with 5mmol/L of potassium persulphate, 78.5% COD has been removed after 3h irradiation time. The decolorization rate fitted to pseudo-first order kinetics with respect of dye concentration. The reaction rate constants for photochemical degradation of RB19 were 0.014 and 0.237 for UV-A/K2S2O8 and UV-C/K2S2O8 processes respectively.
  A. Rezaee , H. Godini , S. Dehestani and A. Khavanin
 

In this study impregnated almond shell activated carbon by Zn° and ZnSO4 were used as adsorbent with a particle size of 10-20 mesh. The objective of this research was to determine the ability of impregnated activated carbon in nitrate removal. The modified activated carbon had 1mm effective size, with a uniformity coefficient of 1.18. Potassium nitrate solution was used in batch adsorption experiments for nitrate removal from water. The effects of nitrate concentration, activated carbon dosage and time of contact were studied. Experimental data showed that modified activated carbon by Zn° and ZnSO4 was more effective than virgin almond activated carbon for nitrate removal. The maximum nitrate removal was 64%-80% and 5%-42% for modified activated carbon and virgin activated carbon, respectively. While virgin activated carbon used, nitrate-N decreased from 20 to 15mg/L in 30min reaction. The final nitrate concentration was not in the standard range of WHO recommendations for water quality; while impregnated activated carbons were used, nitrate drcreased to <10mg/L. Maximum removal was over 16-17mg nitrate-N per 1g activated carbon for impregnated activated carbon. The experiments were conducted at pH=6.2, 20°C and initial concentrations of 20mg/L nitrate-N. Increase in modified activated carbon dosage increased the nitrate removal efficiency. The equilibrium time was found to be 45min for modified activated carbon.

  A. Dehdashti , A. Khavanin , A. Rezaee , H. Assilian and M. Motalebi
  The purpose of this laboratory scale experimental research was to investigate the application of integrated microwave irradiation and granular activated carbon adsorption for removing volatile organic compounds (VOCs) from emissions released from industrial processes and considered major pollutants of the environment. A stream containing 300 ppm toluene was supplied and passed through the granular activated carbon (GAC). The saturated adsorbent was placed in a quartz glass reactor and treated by microwave (MW) irradiation at heating frequency of 2450 MHz at different power levels. Adsorption capacity was evaluated through breakthrough curves and the residue analyzed by gas chromatography. Breakthrough results showed that the high relative humidity of the inlet gaseous stream could lead to decreased GAC adsorption capacity. We found that GAC could absorb microwave irradiation and dissipate heating energy increasing its temperature up to 600°C in a short time mainly depending on the microwave power level. Our experimental results indicated that most of the toluene vapor passed over GAC was decomposed under 900 watt microwave irradiation after around 10 minutes. The addition of water vapor in the inlet stream slightly decreased pollutant removal rate over the GAC while the overall oxidation removal remain the same compared to stream with low content of water vapor. Adsorption isotherms showed that GAC surface area and porosity values increased slightly under microwave irradiation. We concluded that simultaneous application of GAC and microwave irradiation may be an effective approach for removing VOCs from gaseous stream.
  I. Pakzad , A. Rezaee , M.J. Rasaee , A.Z. Hosseini , B. Tabbaraee , S. Ghafurian , A.S. Abdulamir , F. Abu Bakar and M. Raftari
  Lipopolysaccharide (LPS) of Brucella abortus is an essential component for developing the subunit vaccine against brucellosis. B. abortus LPS was extracted by n-butanol, purified by ultracentrifugation and detoxified by alkaline treatment. Pyrogenicity and toxicity of B. abortus LPS and detoxified–LPS (D-LPS) were analyzed and compared with LPS of E. coli. Different groups of mice were immunized intraperitoneally with purified B. abortus LPS, D-LPS, a combination of LPS with human serum albumin (LPS-HSA) and B. abortus S19 bacteria; besides, control mice were inoculated with sterile saline. Two doses of vaccine were given 4 weeks apart. Mice were challenged intraperitoneally with virulent B. abortus 544 strain 4 weeks after the second dose of vaccine. Sera and spleens of mice were harvested 4 weeks after challenge. LPS-B. abortus was 10,000-fold less potent in LAL test and 100-fold less potent in eliciting fever in rabbits than in E. coli LPS. And D-LPS was very less potent in LAL test and eliciting fever in rabbits ordinary LPS. The antibody titer of anti-LPS immunoglobulin G (IgG) was higher than D-LPS. However, mice immunized with either LPS, D-LPS or LPS-HSA vaccines showed a significant protection against infection of the spleen (p<0.01). There was no significant difference between mice immunized with LPS and D-LPS in terms of protection (p<0.99). Therefore, it was concluded that D-LPS and LPS-HSA for B. abortus can be used as safer and more potent vaccines than ordinary LPS-B. abortus vaccine.
  G.R. Asadi karam , Z. Salem , S. Nakhlestanei , M. Sirati Sabet , M. Mahmoodi , A. Rezaee and H.R. Alavi
  Moslems believe that Islam is the most perfect religion and Qur'an the most perfect book that explains all human needs with the best style and there isn't any defect in Islam and Qur'an. The Holy Qur'an says; let man consider his food. Therefore we have decided to investigate the nutritional roles of those foods stated in Qur'an and their biochemical compounds. Almost all diet that is known as complete food today, mentioned in Qur'an and their advantages explained occasionally. A number of verses justified some differences that there were in divine religions about food consumption and a few explained advantages and disadvantages of certain nutrients and drinks such as wine. However according to our knowledge about nutritional roles of food in Qur'an it could be concluded their importance in health and prevention of disorders. Nevertheless, Islam has stressed on health and ordered to save it as a deposit, so the foods mentioned in Qur'an might have a lot of advantages, for example the best oil that has protective role in atherosclerosis is olive oil that is contain of a lot of ω9 fatty acids, researchers say today, olive is mentioned several times in Holy Qur'an. It is more possible that many unknown advantages in olive and other Qur'an's nutrients exist that will be revealed in future. Therefore Moslem scientists have an important duty to reveal a part of these unknowns.
  A. Rezaee , S. Ahmadizad , A. Khavanin , M. Ansari and M. Farokhi
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