Biological Removal of H2S in BAS - Reactor
Gol Mohammad
Mojarrad Moghanloo
Environmental Engineering Research Center, Faculty of Chemical Engineering,
Sahand University of Technology, P.O. Box 51335-1995 Tabriz, I.R. IRAN
author
Esmeil
Fatehifar
Environmental Engineering Research Center, Faculty of Chemical Engineering,
Sahand University of Technology, P.O. Box 51335-1995 Tabriz, I.R. IRAN
author
Saeid
Saedy
Environmental Engineering Research Center, Faculty of Chemical Engineering,
Sahand University of Technology, P.O. Box 51335-1995 Tabriz, I.R. IRAN
author
text
article
2011
per
In this research, biological removal of H2S by Thiobacillus thioparus TK-1 in BAS-reactor was studied. This is unique in that dissolved sulfide was present in the liquid influent feed as a substrate in to a continuous biofilm airlift reactor. The reactor was operated at a constant temperature of 30oC and at pH values of 7. Startup of the reactor was performed with basalt carrier material. The maximum sulfide oxidation rate achieved in mineral medium was about 6.7 mol S2-/m3.h at a hydraulic residence time of 3.3 h. Steady state conditions were not achieved at the highest loading rate, resulting in accumulation of S2- in the bioreactor. Optimal treatment performance was obtained at a loading rate of 4.8 mol/m3.h at conversion efficiency as high as 100%.
Nashrieh Shimi va Mohandesi Shimi Iran
Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
1022-7768
30
v.
2
no.
2011
1
9
https://www.nsmsi.ir/article_7503_1100acc23591b9247ddd21de53a4dec2.pdf
Equilibrium and Kinetics of Biosorption of Chromium(VI) from Aqueous Solutions by B82 Xanthan Beads
Farideh
Golbabaei
Department of Occupational Health Engineering, Faculty of Public Health, Tehran University of Medical Science, Tehran, I.R. IRAN
author
Asghar
Ghahri
Department of Occupational Health Engineering, Faculty of Public Health, Tehran University of Medical Science, Tehran, I.R. IRAN
author
Mohammad Reza
Seodi
Department of Industrial Microbiology, Al-Zahra University, Tehran, I.R. IRAN
author
Abbas
Rahimi Foroshany
Department of Occupational Health Engineering, Faculty of Public Health, Tehran University of Medical Science, Tehran, I.R. IRAN
author
Aram
Tirgar
Department of Social Medicine, School of Medicine, Babol University of Medical Sciences, Babol, I.R. IRAN
author
text
article
2011
per
Contamination of the aqueous environment by heavy metals is a worldwide environmental problem. Biosorption of chromium(VI) from aqueous solutions by xanthan gum biomass was studied in a batch system. The heavy metals uptake was found to be rapid and reached to 88-96% of equilibrium capacity of biosorption in 15min. The pseudo second-order and saturation rate equations were found in the best fitness with the kinetic data (R2 > 0.99). The data obtained from experiments of single-component biosorption isotherm were analyzed using the Freundlich, Langmuir, Freundlich-Langmuir and Redlich-Peterson isotherm models. The Redlich-Peterson equation described the biosorption isotherm of chromium(VI) with high correlation coefficient (R2 > 0.99) and better than the other equations. According to the Langmuir model, the maximum uptake capacities (qm) of xanthan gum. for Pb2+ and Cd2+ were obtained as 1.70 and 1.02mmol/g, respectively. Although the xanthan gum used in this study can be classified as an efficient biosorbent
Nashrieh Shimi va Mohandesi Shimi Iran
Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
1022-7768
30
v.
2
no.
2011
11
24
https://www.nsmsi.ir/article_7515_efe28d1c355112f2586914fbc0a10e52.pdf
Kinetics of Transesterification of Waste Cooking Oil
Bahman
Najafi
Department of Mechanic Engineering, University of Mohaghegh Ardebili, Ardebil, I.R. IRAN
author
text
article
2011
per
In this paper, transesterification of Waste Cooking Oil (WCO) with ethanol was investigated. Three stepwise and reversible reactions are believed to occur (conversion of triglycerides, diglycerides and monoglycerides). The effect of variations in mixing intensity (300 and 600rpm) and temperature (50, 60 and 70°C) on the rate of reaction were studied while the molar ratio of alcohol to triglycerol (6:1) and the concentration of catalyst (0.20 wt% based on WCO) were held constant. appeared up to 30 min of reaction time. The variations in mixing intensity appear to effect the reaction parallel to the variations in temperature. The experimental data appear to be a good fit into a first order kinetic mechanism. The reaction rate constants and the activation energies were determined for all the forward and reverse reactions.
Nashrieh Shimi va Mohandesi Shimi Iran
Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
1022-7768
30
v.
2
no.
2011
25
33
https://www.nsmsi.ir/article_7516_aa5c2458806c6d0f0cfd6d217db4405e.pdf
Production of Nanogold Particles by Biomass (Wheat) and Investigation on Effective Parameters
Mahdi
Zakeri
Department of Chemical Engineering, Faculty of Engineering, Arak University, P.O. Box 38156-875 Arak, I.R. IRAN
author
Javad
Fassihi
Atomic Energy Organization of Iran (AEOI), Tehran, I.R. IRAN
author
text
article
2011
per
In this paper, we have researched about production of nano gold particles by wheat. In this work influence of parameters such as temperature, pH value, time of reaction and concentration of chloride ions on production of nano gold particles has been studied. The results showed that the highest adsorption (in spectrophotometer analysis) were at pH=2, time of reaction=5h, reaction temperature =45°C and concentration of chloride ions =5×10-3M. The results showed that reaction temperature has influence on figure and size of nano gold particles. Also in above optimum conditions, nano gold particles with range of size 5-50 nanometer have been produced.
Nashrieh Shimi va Mohandesi Shimi Iran
Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
1022-7768
30
v.
2
no.
2011
35
41
https://www.nsmsi.ir/article_7517_ef0becdad833ee6fd02ec058d9b2223e.pdf
Study of the Gas Separation Properties of ABS/PVAc Novel Blend Membrane
Hamid Reza
Sanaeepur
Department of Chemical Engineering, Faculty of Engineering, Arak University, P.O. Box 38156-875 Arak, I.R. IRAN
author
Abtin
Ebadi Amooghin
Department of Chemical Engineering, Faculty of Engineering, Arak University, P.O. Box 38156-875 Arak, I.R. IRAN
author
Abdolreza
Moghadassi
Department of Chemical Engineering, Faculty of Engineering, Arak University, P.O. Box 38156-875 Arak, I.R. IRAN
author
Ali
Kargari,
Department of Petrochemical Engineering, Amirkabir University of Technology, Mahshahr Campus,
P.O. Box 415 Mahshahr, I.R. IRAN
author
Davood
Ghanbari
Islamic Azad University, Arak Branch, Arak, I.R. IRAN
author
Zahra
Sheikhi Mehrabadi
Department of Chemistry, Razi University, Kermanshah, I.R. IRAN
author
Mojtaba
Gaemi
Department of Chemical Engineering, Faculty of Engineering, Arak University, P.O. Box 38156-875 Arak, I.R. IRAN
author
text
article
2011
per
CO2 separation has been more considered for its emission control in off-gas and flue gases, upgrading of natural gas, landfill gas recovery and enhanced oil recovery. In this field, here, novel membranes from the blending Acrylonitrile-Butadiene-Styrene (ABS) with Poly(Vinyl Acetate) (PVAc) were prepared. Then, the effect of various PVAc contents incorporated into polymer matrix on the permeation of CO2, CH4 and N2 were investigated. The results showed that the highest CO2 permeability arises in 10% PVAc content. The highest CO2 /CH4 selectivity in 20% PVAc content is 29 and for CO2/N2 in 30% PVAc content is 40.41. A combination of the effects of PVAc polar acetate groups, compression of membrane structure in the present of high molecular weight PVAc, acrylonitrile and flexible butadiene blocks in ABS have caused these occurrences. Furthermore, investigation of the pressure effect on permeability in the range of 2-8 bars has shown no considerable effect on the permeability data with pressure changes. Generally, the prepared membranes can be taken into account as a better membrane for CO2 /N2 separation than CO2 /CH4.
Nashrieh Shimi va Mohandesi Shimi Iran
Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
1022-7768
30
v.
2
no.
2011
43
51
https://www.nsmsi.ir/article_7518_d7ee802d433e35e1cf86b8b7b679fe65.pdf
Influence of Injection Angle in a Jet Mixer
Ali
Sadeghzadeh Namavar
Department of Chemical Engineering, Sahand University of Technology, P.O. Box 51335-1996 Tabriz, I.R. IRAN
author
Jafarsadegh
Moghaddas
Department of Chemical Engineering, Sahand University of Technology, P.O. Box 51335-1996 Tabriz, I.R. IRAN
author
text
article
2011
per
Nowadays, most of the mixers are going to be replaced by jet mixers due to the some benefits. So investigation of the effective parameters is important in these mixers. In this article, the effect of nozzle diameter on different flow rates and effect of angle of jet injection were studied experimentally. The results showed that for a cylindrical tank with the shape factor of h/D=1 and injection from center of its roof in a constant flow rate as the nozzle diameter was increased, the mixing time was increased but the rate of increasing was decreased as flow rate was increased. Moreover the results showed that mixing time was also depended on angle of injection. Injection whit 20 and 30 degree from center of roof had the longest jet length. But injection angle 10 and 45 degree had the least mixing times. Some disagreement with the results of mixing time due to the jet length was observed when compared with those reported in the literature.
Nashrieh Shimi va Mohandesi Shimi Iran
Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
1022-7768
30
v.
2
no.
2011
53
60
https://www.nsmsi.ir/article_7519_630baf0ed18fe55f349ef38d51817b63.pdf
Mechanical Properties of PP/Clay Nanocomposiets Prepared by Melt Blending
Shahryar
Jafari Nejad
School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, I.R. IRAN
author
Hossein
Abolghasemi
School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, I.R. IRAN
author
Seyed Javad
Ahmadi
School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, I.R. IRAN
author
Sohrabali
Ghorbanian
School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, I.R. IRAN
author
text
article
2011
per
Mechanical properties are important parameters in preparation of nanocomposites. Analyzing the trends on mechanical properties gives information about the effect of compatibilizing agent , nanoclays , and processing method. MA and GMA have higher compatibilizing effect than AA because of their different polarity promoting a better mechanical performance specially in Young,s modulus and impact strength and tensile strength and produce a less drastic reduction of the deformation properties. addition of clay to pp improves the tensile modulus and tensile strength, but reduces the elongation at break, regardless of the coupling agent used. In pp/clay, nanocomposites prepared with cloisite 15A and PP-g-MA, tensile strength is decreased , while Young,s modulus is increased.The solvent resistant of these nanocomposites decreased, when clay loading increased. In pp/clay nanocomposites prepared with oligomerically modifiedclay, this clay has plasticising effect on the polymers that the tensile strength is slightly decreased compared with the virgin polymers, while Young,s modulus is slightly increased.It is worth nothing that the elongation at break for most nanocomposites does not drop as severely as usually seen with the typical organically modified clay.
Nashrieh Shimi va Mohandesi Shimi Iran
Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
1022-7768
30
v.
2
no.
2011
61
67
https://www.nsmsi.ir/article_7520_b635ec586b7fa9810a952d4798f6db20.pdf
The Effect of TiO2 on Corrosion Resistance of Porcelain Enamels in Sour Water: A Feasibility Study for Application
in Oil Pipes and Container
Mana
Norouzpour
Faculty of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran,I.R. IRAN
author
Saeid
Baghshahi
Materials Engineering Department, Imam Khomeiny International University, Qazvin, I.R. IRAN
author
Morteza
Tamizifar
Faculty of Metallurgy and Materials Engineering, University Iran Science and Technology, Tehran, I.R. IRAN
author
Abolghasem
Dolati
Faculty of Materials Science and Engineering, Sharif University of Technology, Tehran, I.R. IRAN
author
text
article
2011
per
Porcelain enamels are widely used as coating on metals and alloys, because of their excellent corrosion resistance against different aggressive media with different pHs at high temperatures up to 600oC. In this regard, the chemical composition of the enamels is very important and TiO2 is introduced as additive to promote the corrosion resistance of the enamels. Therefore, corrosion resistance of TiO2 containing and TiO2 free enamels has been examined by applying standard test method ISO 2742. This test has been done in simulated sour water that is one of the most corrosive solutions which is produced during oil refining in refineries. The test has been performed three times on samples for 2.5h. Then, the attacked surfaces were studied by Scanning Electron Microscope (SEM) and then elemental distribution of surface was investigated by Energy Dispersive Spectroscopy (EDS). Finally, by applying Electrochemical Impedance Spectroscopy (EIS), Nyquist spectra of the samples were obtained and compared. The results showed that adding 3.20%wt TiO2 considerably enhanced the chemical and corrosion resistance of the enamel.
Nashrieh Shimi va Mohandesi Shimi Iran
Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
1022-7768
30
v.
2
no.
2011
69
77
https://www.nsmsi.ir/article_7521_164b70d4b48455034513f6df9649fb98.pdf
Application of Headspace Liquid Phase Microextraction - Gas Chromatography for the Analysis of Trace Amounts of Isoamyl Acetate
Massoud
Kaykhaii
Department of Chemistry, Faculty of Sciences, University of Sistan & Baluchestan, Zahedan, I.R. IRAN
author
Samaneh
Mirmohammadi Sadrabadi
Department of Chemistry, Faculty of Sciences, University of Sistan & Baluchestan, Zahedan, I.R. IRAN
author
text
article
2011
per
The performance of Head-Space Liquid Phase Micro Extraction (HS-LPME), coupled with capillary gas chromatography, was assessed for the extraction and determination of ultra trace amounts of isoamyl acetate in some real samples. A 2.5 µL of benzyl alcohol was used as extracting solvent and experimental parameters impacting the performance of extraction were optimized as 1250 rpm stirring rate and 15 min extraction time at 30 oC with 0.34 g.mL−1 NaCl for increasing the of ionic strength of sample solution. Under the optimized conditions, the limit of detection calculated to be 0.50 µg/L. The linear range of calibration curve for isoamyl acetate was found 5-1300 µg/L with a correlation coefficient (R2) of 0.999. Tap water and liquid soap samples were successfully analyzed using the proposed method. The relative standard deviation of water samples spiked with isoamyl acetate at 0, 200 and 400 µg/L levels was from 2.79 to 2.39%; whereas for liquid soap it was 2.74% and 2.48% for standard addition and calibration curve methods respectively. Recovery for water samples were between 101.8-103.2%; and for liquid soap sample, 103.2% and 101.8% was obtained when standard addition and normal calibration curve were employed correspondingly.
Nashrieh Shimi va Mohandesi Shimi Iran
Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
1022-7768
30
v.
2
no.
2011
79
87
https://www.nsmsi.ir/article_7522_f5613362055e05dfc5fd3ccf86a58d0d.pdf
Application of Headspace Liquid Phase Microextraction - Gas Chromatography for the Analysis of Trace Amounts of Isoamyl Acetate
Mehran
Aghaie
Faculty of chemistry, North Tehran Branch, Islamic Azad University, P.O. Box 19585-936 Tehran, I.R. IRAN
author
Babak
iKhezri
Department of Chemistry, Science & Research Campus, Islamic Azad University,
P.O. Box 14515-775 Tehran, I.R. IRAN
author
Karim
Zare
Department of Chemistry, Science & Research Campus, Islamic Azad University,
P.O. Box 14515-775 Tehran, I.R. IRAN
author
Hossein
Aghaie
Department of Chemistry, Science & Research Campus, Islamic Azad University,
P.O. Box 14515-775 Tehran, I.R. IRAN
author
text
article
2011
per
The performance of Head-Space Liquid Phase Micro Extraction (HS-LPME), coupled with capillary gas chromatography, was assessed for the extraction and determination of ultra trace amounts of isoamyl acetate in some real samples. A 2.5 µL of benzyl alcohol was used as extracting solvent and experimental parameters impacting the performance of extraction were optimized as 1250 rpm stirring rate and 15 min extraction time at 30 oC with 0.34 g.mL−1 NaCl for increasing the of ionic strength of sample solution. Under the optimized conditions, the limit of detection calculated to be 0.50 µg/L. The linear range of calibration curve for isoamyl acetate was found 5-1300 µg/L with a correlation coefficient (R2) of 0.999. Tap water and liquid soap samples were successfully analyzed using the proposed method. The relative standard deviation of water samples spiked with isoamyl acetate at 0, 200 and 400 µg/L levels was from 2.79 to 2.39%; whereas for liquid soap it was 2.74% and 2.48% for standard addition and calibration curve methods respectively. Recovery for water samples were between 101.8-103.2%; and for liquid soap sample, 103.2% and 101.8% was obtained when standard addition and normal calibration curve were employed correspondingly.
Nashrieh Shimi va Mohandesi Shimi Iran
Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
1022-7768
30
v.
2
no.
2011
89
94
https://www.nsmsi.ir/article_7523_79d875e38810bbcf647d725c6b604c76.pdf
Investigation on the Influences of Reaction Parameters and Determination of Optimum Condition for the Synthesis of Sodium 2-Acrylamido-2-Methyl Propanesulfonate Using Experimental Design Approach
Amir Hossein
Navarchian
Department of Chemical Engineering, Faculty of Engineering, Isfahan University,
P.O. Box 81746-73441 Isfahan, I.R. IRAN
author
Danyal
Dadkhah
Department of Chemical Engineering, Faculty of Engineering, Isfahan University,
P.O. Box 81746-73441 Isfahan, I.R. IRAN
author
text
article
2011
per
In this paper the synthesis of Sodium 2-Acrylamido-2-Methyl PropaneSulfonate (SAMPS) is studied and the influences of reaction parameters on the conversion are investigated using Taguchi experimental design approach. The results showed that among seven parameters including reaction temperature and time, aeration level and mixing rate in the reaction mixture, the addition sequence of initial materials, and finally the purity and the excess amount of sodium carbonate; just the last two factors as well as the reaction temperature have significant effects, respectively on the reaction extent, while the other factors are insignificant. The optimum conditions to attain the highest conversion are the higher purity and 25% excess amount of sodium carbonate, and 16°C for reaction temperature. The SAMPS product is also characterized by Furrier transform infrared (FT-IR), and hydrogen as well as carbon nuclear magnetic resonance (H-NMR and C-NMR). The morphology and the average particle size of the SAMPS product were also obtained as 20.09 mm (in the range of 1-60 mm) using Scanning Electron Microscopy (SEM).
Nashrieh Shimi va Mohandesi Shimi Iran
Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
1022-7768
30
v.
2
no.
2011
95
107
https://www.nsmsi.ir/article_7524_bd3243ad40bc95533c9e0a6a9a06a817.pdf
Investigation on Composition, Cooling Conditions and Melting Crucible in the System of CaO-P2O5-TiO2 Glass Ceramic
Farshad
Soleimani
Department of Materials Engineering, Faculty of Mechanics Engineering, Tabriz University, Tabriz, I.R. IRAN
author
Mohammad
Rezvani
Department of Materials Engineering, Faculty of Mechanics Engineering, Tabriz University, Tabriz, I.R. IRAN
author
text
article
2011
per
In this research, according to phosphate glass uses in the CaO-P2O5-TiO2 system, several compositions were prepared. Effect of melting crucible, melting time and cooling condition were investigated. FT-IR and XRD were utilized for structural analyzing. Glass transition and crystallization temperature were determined according to DTA trace of optimized glass. Microsructure and phase separation of glass were investigated by SEM. Alumina crucible was good for melting. Melting temperature and time were reported 1350 °C and 1 h, respectively. The best ratio of Ca3(PO4)6 / CaTi4(PO4)6 was between 2-2.16 for optimized glass. Cooling in “the mold with high cooling rate” was suitable. Glass transition and crystallization temperature were determined 680 °C and 833 °C, respectively.
Nashrieh Shimi va Mohandesi Shimi Iran
Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
1022-7768
30
v.
2
no.
2011
109
116
https://www.nsmsi.ir/article_7525_098202f96877c8d1e90fa68b8835c1fd.pdf