Jami Institute of Technology

Najafabad, Iran
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Talaiekhozani A.,Jami Institute of Technology | Talaei M.R.,Shiraz University | Rezania S.,University of Technology Malaysia
Journal of Environmental Chemical Engineering | Year: 2017

Coagulation, chemical oxidation and disinfection are essential processes in water and waste treatment. A chemical that can be applied for all the above-mentioned purposes is ferrate (VI). The aim of this study is to review ferrate (VI) production, measurement, stability, mutagenicity and utilization in coagulation, chemical oxidation and disinfection of water and wastewater treatment. Also, in this study different electrochemical reactors that can be used for ferrate (VI) production have been introduced. In acidic conditions, the oxidation and reduction capacity of ferrate (VI) is superior to all currently utilized oxidizers and disinfectants in water and wastewater treatment. New research provides the technologies of using ferrate (VI) for coagulation, chemical oxidation and disinfection of water and wastewater simultaneously in a reactor, which can reduce the size of water and wastewater treatment plants and increase their treatment efficiency. Despite the existence of these technologies, there is no full-scale application of ferrate (VI) in the water and wastewater industry. This is due to difficulties associated with (1) the lack of adequate research demonstrating its capabilities and advantages over existing water and wastewater treatment methods, (2) the instability of ferrate (VI) depending on its method of preparation and (3) the relatively low yield of ferrate (VI). Therefore, to solve the above-mentioned difficulties, fundamental study most be carried out to discover the novel methods of ferrate (VI) production, focusing on increasing product stability and production yield. © 2017 Elsevier Ltd. All rights reserved.

Mosayebi M.,Malek-Ashtar University of Technology | Zarrinkolah F.,Jami Institute of Technology | Farmanesh K.,Malek-Ashtar University of Technology
International Journal of Advanced Manufacturing Technology | Year: 2017

The elastic deformation of rolling mill elements during the rolling process is important. By knowing the displacement of rolls, the optimum gap between the work rolls can be calculated. In present research, a vibration model with two degrees of freedom is proposed for a cold sheet rolling mill and the stiffness parameters of different mill elements are calculated. A numerical simulation and a finite element analysis are also carried out for the related vibrations. Afterwards, the maximum displacement of rolls is calculated using the vibration transient response of the work roll and backup roll. It is found that the system vibration reaches the critical damped level, and the rolls return to their resting positions quicker, and the effects of oscillations on the sheet being rolled decreases. As a result, precision of reduction in sheet thickness increases. Moreover, due to decrease in the sheet speed, the oscillation amplitude of rolls declines and movements of rolls turn into movements without oscillating. Finally, to verify the effectiveness of the proposed method, the experimental data are compared with calculated stiffness parameters and the rolling force. © 2017 Springer-Verlag London

Talaie A.,Jami Institute of Technology | Beheshti M.,University of Isfahan | Talaie M.R.,University of Isfahan
Desalination and Water Treatment | Year: 2011

Two strains of Pseudomonas aeruginosa were isolated from crude oil of Isfahan oil refinery and used in a lab scale fermenter for removal of floating crude oil pollution from water. Maximum stable removal efficiency of 92% was reached despite the stepwise increase in the culture medium crude oil concentration from 0.1 g/l to 0.3 g/l and maximum biodegradation rate of 98.6 mg/l h was obtained. During 91 d mixed liquid suspended solid (MLSS) changed between 4000 and 8000 mg/l and sludge volume index (SVI) changed between 20 and 90 mg/l. The performance was investigated during a 91 d continuous operation of a fermenter which was intermittently fed with oil-polluted water. It seems biodegradation of this mixed culture is high removal efficiency (92%) in low time (7.5 d). © 2011 Desalination Publications.

Talaie A.R.,Jami Institute of Technology | Jafaarzahe N.,Health Science University | Talaie M.,University of Isfahan | Beheshti M.,University of Isfahan
Journal of Zanjan University of Medical Sciences and Health Services | Year: 2010

Background and Objective: Oil pollutions are one of the most important environmental problems worldwide that researchers have tried different methods for its degradation. In this regards biological methods attracted the attention of the researchers more than other methods. The main objective of this study was to find microorganisms that could degrade aromatic components in the floating crude oil. Materials and Methods: In order to find such microorganisms, some samples were taken from areas contaminated by petroleum compounds. Microorganisms that could live with crude oil as sole carbon source were isolated. From these samples 14 microorganisms isolated which all were bacteria. The variations of aromatic compounds concentration were measured by gas chromatography method. Results: Among 14 microorganisms two microorganisms that called A-3 and A-14 had more ability and degraded the aromatic components 89% and 86% respectively. By microbiological techniques it was found that A-14 is pseudomonas aerogenusa. Conclusion: The results of this study showed that biodegradation of aromatic compounds that are one of the must toxic materials in crude oil are possible. Also indicated that some oil-degrading microorganisms exist in the nature that do not need to adaptation for biodegradation of oily compounds.

Fulazzaky M.A.,University of Technology Malaysia | Talaiekhozani A.,Jami Institute of Technology | Abd Majid M.Z.,University of Technology Malaysia
Ecological Engineering | Year: 2016

Formaldehyde (FA) is one of toxic, mutagen, suspected carcinogen and teratogen pollutants presented in contaminated air and might be commonly released from a wide range of the industrial activities. Even though many studies have been made to remove FA from synthetic contaminated air stream (SCAS) using a biotrickling filter reactor (BTFR), the mechanisms of FA removal by a BTFR treatment process must to be verified. The aim of this study was to perform the laboratory-scale BTFR experiments to remove FA from the SCAS during a period of 21 days after passing an adaptation phase of 90 days. The mechanisms of FA removal from SCAS in biofilter must pass through two successive stages: (1) the first diffuses FA from gas phase to aqueous phase to form formic acid and methanol and (2) the second guarantees that the predominant microorganisms are able to metabolise the chemicals-derived FA from aqueous phase for growth and maintenance of life. The research findings may lead to better understanding of the BTFR design and operations to reduce air pollutants in order to maintain or improve air quality. © 2016 Elsevier B.V.

Nematollahi O.,Isfahan University of Technology | Hoghooghi H.,Isfahan University of Technology | Rasti M.,Jami Institute of Technology
Renewable and Sustainable Energy Reviews | Year: 2016

The energy security and supplies of energy are the key components for progressing countries. Renewable energy resources are rapidly being recognized as clean sources of energy to withstand damages to environment and to avoid future crisis. In this study, energy consumption and energy demands in the progressing Middle East countries are reviewed. First, the growth of energy consumption of the region through recent years is presented which show the rapidly growing energy demand in the Middle East countries. Second, by using RETScreen software data, the potential of the main renewable energies of solar and wind resources are evaluated. Results showed that the Middle East region have a very good potential for using renewable energies. Results are presented as GIS maps of wind speed, wind power density and solar radiation intensity. With using the GIS maps, the great locations for utilizing solar or wind energies are identified. The presented GIS maps may facilitate development of hybrid solar and wind systems within the Middle East region. © 2015 Elsevier Ltd.All rights reserved.

Fulazzaky M.A.,University of Technology Malaysia | Talaiekhozani A.,University of Technology Malaysia | Talaiekhozani A.,Jami Institute of Technology | Hadibarata T.,University of Technology Malaysia
RSC Advances | Year: 2013

Formaldehyde (FA) removal from contaminated air has been extensively studied using a bio-trickling filter reactor (BTFR). However, the effect of different volumetric air flow rates (VAFRs) on FA removal efficiency needs to be verified for better BTFR design with optimal operating conditions. This study uses a laboratory-scale BTFR, operating with the three different VAFRs to remove FA from synthetic contaminated air. Mathematical models to determine the optimal retention time of contaminated air flow through the BTFR system are developed. The effect of different pH values on the FA removal efficiency is evaluated. FA removal efficiencies of 99, 96 and 95% are verified for VAFRs of 90, 291 and 1512 L h-1, respectively. Optimal retention times of 141, 50 and 26 s are verified for BTFR experiments operating at 90, 291 and 1512 L h-1 VAFR, respectively. The logarithmic models are proposed as a new approach for determining the optimal retention time and hoped to make a significant contribution to future biotechnological developments and air quality improvement analysis. © 2013 The Royal Society of Chemistry.

Talaie A.,Jami Institute of Technology | Beheshti M.,University of Isfahan | Talaieb M.R.,University of Isfahan
Desalination and Water Treatment | Year: 2011

Oil pollution is one of the important environmental problems in the world. In order to degrade floating crude oil in the wastewater, two soil samples were taken from the oil-contaminated soils in Ahwaz (Iran) and an oil refinery complex in Tehran (Iran). Fourteen strains of bacteria isolated from these samples. Among these bacteria a strain marked as A-14 could treat 91% of total petroleum hydrocarbons and 83% of aromatic compounds in the floating crude oil after 10 d. Also the optimum time to reach the maximum removal percent (90%) was found to be 7 d. A-14 was identified to be Pseudomonas aeruginosa. All isolated bacteria in this study were able to produce biosurfactant. A-12 resulted in the best emulsification index that was about 36%. However, this strain could remove only 46% and 37% of the total petroleum hydrocarbons and aromatic compound, respectively. Most of the isolated microorganisms in this study had higher efficiency for the degradation of total petroleum hydrocarbons (TPH) than aromatic compounds. In most of the previous studies, only dissolved or tiny droplet of crude oil were degraded but the pure culture of P. aeruginosa that we isolated them from the oil contaminated soils could degrade floating crude oil with high removal efficiency (90%). © 2011 Desalination Publications.

PubMed | University of Isfahan and Jami Institute of Technology
Type: | Journal: Journal of environmental management | Year: 2016

Odorous gases are the most important reason that people register complaints with organizations responsible for wastewater collection and treatment systems (WCTS). Although several studies have been conducted for prevention and control of odorous gases, no comprehensive research exists about recent achievements in this area. The aim of the present study is to collect and categorize the new achievements in preventing and controlling odorous gases in WCTS. Two strategies for controlling odor emissions from WCTS are (1) prevention of odor production and (2) removal of odorous compounds from emissions of WCTS. Between the two, priority goes to preventing odorous compounds production. Several methods have been developed to prevent odor production, such as increasing oxidation reduction potential; inhibiting the activity of sulfide reducing bacteria; chemical removal of hydrogen sulfide; applying formaldehyde and paraformaldehyde to prevent hydrogen sulfide production; and using fuel cells in hydrogen sulfide inhibition and gradual release of oxygen in gas phase by using MgO2 or CaO2. In addition to preventing odorous compounds in WCTS, many other methods have been introduced to remove odorous compounds from emissions of WCTS, such as biofilters; bioscrubbers; biotrickling filters; suspended growth reactors; and membrane bioreactors and scrubbers. Through this review, responsible organizations can find new, effective, and economical strategies to prevent and control odorous gases in WCTS.

PubMed | University of Isfahan and Jami Institute of Technology
Type: Journal Article | Journal: Journal of environmental management | Year: 2016

Formaldehyde removal from an air stream absorbed into a water stream in a packed bed continuously and then removed by employing a combination of UV and ferrate(VI) as a highly-powerful oxidant in a continuous stirred tank. In addition, the removal of formaldehyde from water was investigated in both batch and continuous modes. The results of the study performed on formaldehyde-contaminated water treatment can be used for both air and water treatment process design. The primary objective of this study is to compare the performance of using UV and ferrate(VI) individually with that of using UV/ferrate(VI) simultaneously to remove formaldehyde from both air and water. Moreover, the effects of several factors such as pH, ferrate(VI) concentration and temperature on formaldehyde removal from water using ferrate(VI) method were evaluated. The results of the current study in batch condition showed that the best initial pH and ferrate(VI) concentration to obtain the highest formaldehyde removal are 2 and 1mg/l, respectively. The results of this part of research also reveal that temperatures rise from 25C to 50C increases formaldehyde removal from 69% to 97%; however, further increase in temperature has an adverse effect on removal efficiency. The combination of UV and ferrate(VI) enhances formaldehyde removal efficiency to very close to 100% within 35min. In continuous air stream treatment, maximum formaldehyde removal of 94% was obtained by using a packed bed scrubber with gas over liquid flow rates ratio of 1.28m

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