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RISS 인기검색어
- 검색키워드
- 저자 : Mohammad Hassan Fazaelipoor (검색결과 4 건)
- 무료
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Coal flotation using a biosurfactant from Pseudomonas aeruginosa as a frother
Mohammad Hassan Fazaelipoor,Hamid Khoshdast,Mohammad Ranjbar 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.5
A biosurfactant-producing bacterial species (Pseudomonas aeruginosa) was grown in a mineral solution with gas oil as the source of carbon and energy. The biosurfactant was recovered from the solution by collecting the foam on the surface and drying. It had critical micelle concentration of 100 ppm. Froth characterization showed that the biosurfactant was superior to methyl isobutyl carbinol (MIBC) in terms of froth height and stability. The biosurfactant was examined in coal flotation as a frother. The combustible matter recovery of 72-79% with 10-15.5% ash content supporting 55-57.5% separation efficiency seemed promising enough to introduce the biosurfactant from Pseudomonas aeruginosa as a new frother.
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Haidar Abbasi,Mohammad Hassan Fazaelipoor 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.2
The feasibility of continuous production of PGases by a strain of Aspergillus niger was investigated in a surface culture bioreactor. Pectin was used as the substrate. The fermentation started in batch mode until the medium was covered with the mycelia of the microorganism and after that it turned to continuous mode by introducing the fresh feed. The process continued for 34days. The thickness of the microorganism layer on the surface of the liquid medium became almost constant after about 1 week. The production of PGases, however,continued throughout the experiment. Maximum exo-polygalacturonase (exo-PGase) and endo-polygalacturonase (endo-PGase) activities of 1.5 and 0.014 U/mL were obtained,respectively. An increase in enzyme concentrations was observed when a similar system was used with a line for medium recycle. A Michaelis-Menten type equation was considered for the rate of PGases production in the surface culture bioreactor and the process was modeled. The model parameters were estimated using an optimization method (Particle Swarm Optimization). The model predicted the experimental data reasonably well.
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Application of Water Super Absorbents in Waste Air Biofiltration
Mohsen Akbari,Mohammad Hassan Fazaelipoor,Ataollah Soltai Goharizi 한국생물공학회 2011 Biotechnology and Bioprocess Engineering Vol.16 No.2
Water super absorbents are low cross-linked hydrophilic polymers that absorb water in amounts up to several hundred times their dry weight. In this study, the effect of adding these materials to the bed of a biofilter was investigated. Two equal size biofilters were used for this purpose. One of the biofilters was packed with a mixture of perlite and a commercial polyacrylamide based super absorbent (2.3% dry weight), and the other was packed with perlite to perform as a control. The biofilters were inoculated with a bacterial culture that was able to grow on n-hexane as the sole source of carbon and energy. Both biofilters removed up to 90% of the entering pollutants when using an inlet n-hexane concentration of 1 g/m^3, and an air flow rate of 0.3 L/min (mass loading of 18.34 g/m^3/h, and empty bed residence time of 3.27 min). The super absorbent had a positive effect on the performance of the biofilter. While the difference in the performance of the biofilters was marginal when frequent moistening was applied, the difference was considerable when moistening was less frequent.
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Bioleaching kinetics of copper from copper smelters dust
Fereshteh Bakhtiari,Hossein Atashi,Mortaza Zivdar,Seyedali Seyedbagheri,Mohammad Hassan Fazaelipoor 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.1
The smelting factory of Sarcheshmeh Copper Complex in Iran produces about 50 tons per day of copper dust containing 36% Cu, 22.2% Fe and 12.2% S. The dust is currently recycled to the smelters. Thismethod is not desirable in terms of operation, and energy consumption. A mixed culture of mesophilic bacteria was used to examine the bioleaching of copper from the dust. The effect of various parameters such as pulp density, nutrients, temperature, and the amount of pyrite added to the bioleaching media were examined in the dust bioleaching tests. It was shown that the bacteria contributed effectively in the leaching of copper from the dust. The collected data showed that at pH 1.8 and the pulp density less than 7%, the dissolution of copper followed shrinking core kinetic model and the process was limited by diffusion of lixiviant. With the pulp density of 7%, however, the process showed to be reaction limited.
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