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RISS 인기검색어
- 검색키워드
- 저자 : Ghorban Asgari (검색결과 3 건)
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Bahman Ramavandi,Ghorban Asgari,Javad Faradmal,Soleyman Sahebi,Babak Roshani 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.12
Taguchi orthogonal design was applied for multivariate optimization of Cr (VI) abatement by canta-loupe peel powder (CPP), as a novel adsorbent, from industrial wastewater in a batch mode. Effective factors in theadsorption process, such as temperature, CPP dose, Cr (VI) concentration, wastewater pH, and contact time, were con-sidered using an L16 orthogonal array design. The best conditions for adsorbing of Cr (VI) were determined by the Taguchimethod and desirability approach as pH of 2, chromium concentration of 100 mg/L, contact time of 5 min, CPP dosageof 0.5 g/L, and wastewater temperature of 25 oC. Analysis of variance results indicated that the pH was the most im-portant variable influencing the chromium removal percentage, and its contribution value was obtained 45.01%. TheLangmuir model proved best fit for the experimental data and maximum adsorption capacity of Cr (VI) onto CPP wasobtained 166.25 mg/g. The final part of the study includes an examination of the CPP through an analysis of the removalof chromium from real industrial wastewater. It can be concluded that the CPP presents a promising and efficient al-ternative for eliminating of Cr (VI) from industrial wastewaters.
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Maryam Foroughi,Hamid Reza Soheil Arezoomand,Ali Reza Rahmani,Ghorban Asgari,Davood Nematollahi,Kaan Yetilmezsoy,Mohammad Reza Samarghandi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.11
Performance of electrodegradation process using stainless steel net electrodes was explored for removal of tetracycline (TC) from synthetic wastewater in a laboratory batch study. Main effects of various operating parameters, such as initial TC concentration (20 and 100mg/L), reaction pH (3.0 and 9.0), current density (4.1 and 17.1mA/cm2), agitation speed (250 and 750 rpm), and electrolysis time (20, 50, and 80 min), and their interactions on the TC removal efficiency, were optimized by means of a five-factor and two-level factorial experimental design methodology. The significance of responses obtained from the proposed design (sixteen experimental runs under batch mode conditions) was statistically evaluated by preparing a Pareto chart, half-normal probability plot, and plots of main effects and their interactions (herein referred to as Factions) within the framework of the analysis of variance (ANOVA). The statistical results corroborated with 95% certainty that TC concentration, pH, and current density showed the largest effects (absolute values) on the TC removal efficiency. Besides the most effective Factions, a sodium sulfate (used as supporting electrolyte) dose of 1 g/200 cc was determined as the optimum value for the studied process. Under the conditions of an initial TC concentration=20 mg/L, a reaction pH=3.0, current density=17.1mA/cm2, an agitation speed=250 rpm, and an electrolysis time=20min, about 70% of TC could be successfully removed from the simulated wastewater. Findings of this experimental study clearly confirmed the applicability of the electrodegradation process for the removal of a broad spectrum antibacterial agent like TC, and also demonstrated the effectiveness of the factorial design methodology before transferring the obtained experimental knowledge for a full-scale facility.
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Abdolmotaleb Seidmohammadi,Raheleh Amiri,Javad Faradmal,Mostafa Lili,Ghorban Asgari 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.3
Photocatalytic degradation of 4-chlrophenol (4-CP) using UVA-LED assisted persulfate and hydrogen peroxide activated by the nZVI (Nano Zero Valent Iron) in a batch photocatalytic reactor was investigated. The reaction involved a lab-scale photoreactor irradiated with UVA-LED light emitted at 390 nm. The efficiency of the reaction was evaluted in terms of 4-CP degradation and mineralization degree at different pH of solution, initial concentrations of nZVI, persulfate, hydrogen peroxide and 4-CP. In UVA-LED/H2O2/nZVI process, complete degradation of 4-CP (>99%) and 75% mineralization was achieved at pH of 3, hydrogen peroxide concentration of 0.75 mM, nZVI dosage of 1mM and initial 4-CP concentration of 25mg/L at the reaction time of 30 min. The optimum conditions obtained for the best 4-CP degradation rate were at an initial concentration of 25mg/l, persulfate concentration of 1.5mM, nZVI dosage of 1mM, pH of 3 and reaction time of 120min for UVA-LED/persulfate/nZVI process. It was also observed that the 4-CP degradation rate is dependent on initial 4-CP concentrations for both processes. The pseudofirst- order kinetic constant at 25mg/L initial concentration of 4-CP was found to be 1.4×10−1 and 3.8×10−2 in UVALED/ H2O2/nZVI and UVA-LED/persulfate/nZVI processes, respectively. Briefly, the UVA-LED/H2O2/nZVI process enhanced the degradation rate of 4-CP by 3.67-times in comparison to UVA-LED/persulfate/nZVI process at 30min contact time, which serves as a new and feasible approach for the degradation of 4-CP as well as other organic contaminants containing wastewater.
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