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Abdolhamid Salahi,Toraj Mohammadi,Reza Mosayebi Behbahani,Mahmood Hemmati 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.6
Hollow fiber membranes were prepared from polyethersulfone/additives/NMP&DMSO system via phase inversion induced by precipitation in non-solvent coagulation bath. The interaction effects of polyethylene-glycol (PEG), propionic-acid (PA), Tween-20, PEG molecular weight and polyvinyl-pyrrolidone (PVP) on morphology and performance of synthesized membranes were investigated. Taguchi method (L16 orthogonal array) was used initially to plan a minimum number of experiments. 32 membranes were synthesized (with two replications) and their permeation flux and TOC rejection properties to oily wastewater treatment were studied. The obtained results indicated that addition of PA to spinning dope decreases flux while it increases TOC rejection of prepared membranes. Also, the result shows that addition of PVP, Tween-20 and PEG content in spinning dope enhances permeation flux while reducing TOC rejection. The obtained results indicated that the synthesized membranes was effective and suitable for treatment of the oily wastewater to achieve up to 92.6, 98.2, and 98.5% removal of TOC, TSS, and OGC, respectively with a flux of 247.19 L/(m2h). Moreover, Hermia’s models were used for permeation flux decline prediction. Experimental data and models predictions were compared. The results showed that there is reasonable agreement between experimental data and the cake layer model followed by the intermediate blocking model.
Hooman Adib,Shadi Hassanajili,Mohammad Reza Sheikhi-Kouhsar,Abdolhamid Salahi,Toraj Mohammadi 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.1
An experimental study on separation of industrial oil from oily wastewater has been done. A polyacryloni-trile membrane with a molecular weight cut-off (MWCO) of 20 kDa was used and an outlet wastewater of API unit ofTehran refinery was employed. The main purpose of this study was to develop a support vector machine model forpermeation flux decline and fouling resistance in a cross-flow hydrophilic polyacrylonitrile membrane during ultrafil-tration. The operating conditions which have been applied to develop a support vector machine model were trans-membrane pressure (TMP), operating temperature, cross flow velocity (CFV), pH values of oily wastewater, perme-ation flux decline and fouling resistance. The testing results obtained by the support vector machine models are in verygood agreement with experimental data. The calculated squared correlation coefficients for permeation flux declineand fouling resistance were both 0.99. Based on the results, the support vector machine proved to be a reliable accurateestimation method.