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T. Amani,M. Nosrati,S.M. Mousavi 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.1
Anaerobic oxidation of volatile fatty acids (VFAs) as the key intermediates is restricted thermodynamically. Presently, enriched acetogenic and methanogenic cultures were used for syntrophic anaerobic digestion of VFAs in an upflow anaerobic sludge bed reactor fed with acetic, propionic, and butyric acids at maximum concentrations of 5.0, 3.0, and 4.0 g/L, respectively. Interactive effects of propionate, butyrate and acetate were analyzed. Hydraulic retention time (HRT) and acetate oxidizing syntrophs and methanogen (hydrogenotrophs) to syntrophic bacteria (propionate- and butyrate-oxidizing bacteria)population ratio (M/A) were investigated as key microbiological and operating variables of VFA anaerobic degradations. M/A did not affect the size distribution and had little effect on extracellular polymer contents of the granules. Granular sludge with close spatial microbial proximity enhanced syntrophic degradation of VFAs compared to other cultures, such as suspended cultures. Optimum conditions were found to be propionate = 1.93 g/L, butyrate =2.15 g/L, acetate = 2.50 g/L, HRT = 22 h, and M/A = 2.5corresponding to maximum VFA removal and biogas production rate. Results of verification experiments and predicted values from fitted correlations were in close agreement at the 95% confidence interval. Granules seemed to be smaller particles and less stable in construction with an irregular fractured surface compared to the original granules.
Portland cement structure and its major oxides and fineness
Nosrati, A.,Zandi, Y.,Shariati, M.,Khademi, K.,Aliabad, M. Darvishnezhad,Marto, A.,Mu'azu, M.A.,Ghanbari, E.,Mahdizadeh, M.B.,Shariati, A.,Khorami, M. 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.4
Predicting the compressive strength of concrete has been considered as the initial phase across the cement production processing. The current study has focused on the integration of the concrete compressive strength in 28 days with the mix of the major oxides and fine aggregates as an experimental formula through the use of two types of Portland cement resulting the compressive strength of the concrete highly dependent on time.
M. Esmaeili,S.S. Madaeni,S. Attar Nosrati,A. Vahidi Ferdowsi,M. Joshagani 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
Bis(bipyridine) silver (II) peroxydisulfate (Ag(bipy)2S2O8) has been applied as an alternative salt in thepreparation of polyethersulfone (PES)/polyethylene oxide (PEO) facilitated transport membranes aimingat postponing the reduction process of silver carrier agents. The geometrical structure, mechanical andpermeation properties of membranes containing Ag(bipy)2S2O8 or AgBF4 salts were compared in theethylene/ethane separation process. Formation of silver nanoparticles from [Ag(bipy)2]2+ cations was lower than from Ag+, which wasdetected by means of UV–Visible spectroscopy and transmission electron microscopy (TEM). The twopositive charges of [Ag(bipy)2]2+ cations besides oxidative properties of S2O82 anions postponed thereduction time of active sites. Ag(bipy)2S2O8 incorporated membranes possessed higher permeation,selectivity durability, mechanical strength and stronger CO bond strength and lower pore size andsurface roughness than that of membranes containing AgBF4 salt. Lower lattice energy and sterichindrance of AgBF4 salt resulted in homogeneous distribution of Ag+ cations and counter-ions. Themaximum selectivity of 124 was obtained at the highest AgBF4 concentration (molar percent = 50%) andoperational pressure (4 barg). On the other hand, the maximum ethylene selectivity after saturation stepbelonged to the membrane containing (Ag(bipy)2S2O8) salt, which was 115 at the same condition.
Portland cement structure and its major oxides and fineness
A. Nosrati,Y. Zandi,M. Shariati,K. Khademi,M. Darvishnezhad Aliabad,A. Marto,M.A. Mu’azu,E. Ghanbari,M.B. Mahdizadeh,A. Shariati,M. Khorami 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.4
Predicting the compressive strength of concrete has been considered as the initial phase across the cement production processing. The current study has focused on the integration of the concrete compressive strength in 28 days with the mix of the major oxides and fine aggregates as an experimental formula through the use of two types of Portland cement resulting the compressive strength of the concrete highly dependent on time.
H. Azargoshasb,S.M. Mousavi,T. Amani,A. Jafari,M. Nosrati 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Anaerobic digestion is a sequential complex biochemical process that involves a series of reactions thatare mediated by several different groups of anaerobic microorganisms. In many anaerobic digesters,syntrophic reactions are regarded as steps that limit the rate of the process. This research describes asimulation based on three-dimensional computational fluid dynamics (CFD) coupled with populationbalance equations (PBE) of syntrophic (acetogenesis and methanogenesis) reactions in a continuousstirred reactor. The commercial software FLUENT 6.3 was employed to solve the governing equations. Amodel of Eulerian multiphase and k e turbulence (RNG) was formulated to simulate reaction zonehydrodynamics in the reactor with various influent concentrations of volatile fatty acids (VFAs) andhydraulic retention times (HRT). Concentration profiles of VFAs in the three-phase system displayed aheterogeneous flow pattern. Simulation results indicate that VFAs were degraded efficiently and themodel was found to be in good agreement with results of experiments, especially at low concentrationsof influent VFAs.