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RISS 인기검색어
- 검색키워드
- 저자 : A.A.L. Zinatizadeh (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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H. Zangeneh,A.A.L. Zinatizadeh,M. Feizy 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
A detailed investigation on photooxidation of linear alkyl benzene (LAB) industrial wastewater is presented in this study. The process analysis was performed by varying four significant independent variables including two numerical factors (initial pH (3–11) and initial H2O2 concentration (0–20 mM)) and two categorical factors (UV irradiation and ozonation). The experiments were conducted based on a central composite design (CCD) and analyzed using response surface methodology (RSM). To assess the process performance, two parameters viz. TCOD removal efficiency and BOD5/COD were measured throughout the experiments. A maximum reduction in TCOD was 58, 53, 51, and 49%, respectively for UV/H2O2/O3, H2O2/O3, UV/O3 and UV/H2O2 processes at the optimum conditions (initial pH of 7, initial H2O2 concentration of 100 mM, and reaction time of 180 min). A considerable increase in BOD5/COD ratio was obtained in the combined processes (0.46, 0.51, 0.53, and 0.55 for UV/H2O2, UV/O3, H2O2/O3 and UV/H2O2/O3, respectively) compared to the single oxidant process (0.35). The results showed that mineralization of the LAB industrial wastewater in neutral pH is more favored than in acidic and basic pH. Gas chromatography–mass spectrometry (GC–MS) was applied to show the fate of organic compounds. In conclusion, the photooxidation process (UV/H2O2/O3, H2O2/O3, UV/O3 and UV/H2O2) could be an appropriate pretreatment method prior to a biological treatment process.
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Z. Rahimi,A.A.L. Zinatizadeh,S. Zinadini 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
Membrane bioreactor (MBR) is an innovative hybrid biotechnology for wastewater treatment. However,its application is constrained by its tendency to fouling. Various procedures are applied to reducemembrane fouling. In this work, nanocomposite membranes were prepared by embedding aminofunctionalized multi-walled carbon nanotubes (NH2-MWCNTs) and were used for improving membranesurface hydrophilicity and subsequently the reduction of the membrane biofouling. The NH2-MWCNTswere synthesized and used as nanofiller in preparation of polyethersulfone (PES) ultrafiltration (UF)membrane. The modified MWCNTs were blended with different weight percentage in the castingsolution, i.e. 0.05, 0.1 and 1 wt.%. In this study, the effect of the NH2-MWCNTs on membrane morphologyand antibiofouling property was investigated. The Fourier transform infrared (FT-IR) spectra analysisshowed that the –NH2 functional groups formed on the surface of MWCNTs. The nanocompositemembranes prepared with different contents of NH2-MWCNTs nanofiller were characterized usingcontact angle, scanning electron microscopy (SEM), and permeation tests. The SEM images displayeda finger-like and porous structure for all synthesized UF membranes. Contact angle measurementsindicated that NH2-MWCNTs nanofiller improved the hydrophilicity of the obtained membranes. Fouling resistances of the membranes elucidated by activated sludge suspension filtration andmeasurements of flux recovery ratio (FRR). The results of the experiments revealed that the 0.1 wt.%NH2-MWCNTs membrane had the best permeability, hydrophilicity and antibiofouling properties. It was quite a surprise to discover that inclusion of only about 0.1 wt.% of the amino functionalizedMWCNTs in the fabrication of membrane could spring up a generation of membrane with antibiofoulingcapability for MBRs.
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S. Zinadini,A.A.L. Zinatizadeh,M. Rahimi,V. Vatanpour 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
Nanocomposite polyethersulfone (PES) nanofiltrationmembranes were prepared using self-synthesizedmagnetic ZnFe2O4/SiO2 nanofiller by the phase inversion method. The main aim of this paper was toinvestigate effect of magnetic field in coagulation step on characteristics of the prepared membranes. The performance of the fabricated mixed matrixmembranes was studied by measuring pure water flux,salt retention and fouling parameters. As a result, coagulation bath under magnetic field significantlyenhanced pure water flux of the membranes from about 12 kg/m2 h (without magnetic field) to 38 kg/m2 h in the presence of 1 wt.% ZnFe2O4/SiO2 nanoparticles. This described by amount of magneticnanofillers on the membrane morphology coagulated under the magnetic field of 0.1 T, which changedthe skin-layer structure. EDX mapping showed that the magnetic nanoparticles migrated to themembrane surface, when the membrane coagulated under magnetic field. The water contact anglemeasurement showed the excellent hydrophilicity of 0.5 wt.% ZnFe2O4/SiO2 embedded membranesunder magnetic field, which resulted in the superior antifouling properties against powdermilk solution. The salt retention sequence for 0.5 wt.% nanoparticle under magnetic field was in sequence of R(Na2SO4) > R (MgSO4) > R (NaCl).
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H. Zangeneh,A.A.L. Zinatizadeh,M. Habibi,M. Akia,M. Hasnain Isa 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
This article compares the effectiveness of pure and modified TiO2 for photocatalytic degradation of different organic matters and clarifies the advantages of the modified TiO2 with photoactivity under visible light. Photocatalytic degradation technique with titanium dioxide is generally applied for treating wastewater containing refractory organic contaminants with the purpose of reuse due to its ability to achieve complete mineralization of the compounds under mild conditions such as ambient temperature and pressure. Performance of different types of photocatalytic reactors, effects of important parameters on the reactors performance, effect of various methods used to enhance the photocatalytic activity of TiO2 including doping, sensitization of TiO2 and surface modification are discussed in details. So far, a few review papers have been published and extensive information have been reported on the structure and electronic properties of TiO2, difference between TiO2 with other common semiconductors used for photocatalytic applications, various methods used to enhance the photocatalytic characteristics of TiO2 including dye sensitization, doping, coupling, the effects of various operating parameters on the photocatalytic degradation of phenols and dyes and types of reactors, comparison between effective modes of TiO2 application as immobilized on surface or as suspension, and photocatalytic hybrid membrane system are presented. However, in the published review papers, performance of the different modified photocatalysts is rarely compared quantitatively. Therefore, in order to provide an inclusive and effective comparison among the studies, specific removal rate (SRR) (mg compoundremoved/g cat. h) was calculated as a response.
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