Method and Technical Analysis Laboratory

Sidi Bou Saïd, Tunisia

Method and Technical Analysis Laboratory

Sidi Bou Saïd, Tunisia
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Aouni A.,British Petroleum | Fersi C.,British Petroleum | Fersi C.,Method and Technical Analysis Laboratory | Dhahbi M.,British Petroleum
Desalination and Water Treatment | Year: 2014

In this study, experiments were carried out to evaluate a direct nanofiltration membrane process performance in terms of flux, rejection, and resistance to fouling, for treating two real textile dyeing rinsing waters (indigo blue and sulfur black) collected from rinsing baths of Ksar Hellal factory (SITEX). Based on permeate flux efficiencies and regarding permeate quality in terms of pollutant rejections, indigo blue permeate presented better performances than sulfur black. During volume reduction factor experiments, an average of 99% reduction in turbidity, 97% in COD removal, and a colorless permeate were observed in the case of indigo blue, whereas for sulfur black permeate, these rejections values reached only 67, 86, and 52%, respectively, in terms of turbidity, COD and color removal efficiencies. However, low salt rejection rates were obtained that did not exceed 34% for both rinsing effluents. These results confirm the fouling problem of NF HL membrane; even it presented a significant improvement in permeate quality. The fouling influence after NF stage was evaluated by determining resistances in series. Nevertheless, NF HL membrane seemed to be more sensitive to fouling caused by treating sulfur black effluent. Moreover, the irreversible fouling was more important than the reversible one, for both studied samples. © 2013 Balaban Desalination Publications. All rights reserved.


Aouni A.,British Petroleum | Fersi C.,British Petroleum | Fersi C.,Method and Technical Analysis Laboratory | Cuartas-Uribe B.,Polytechnic University of Valencia | And 3 more authors.
Desalination | Year: 2012

Ultrafiltration and nanofiltration processes were used to treat synthetic reactive dyes aqueous solutions and a raw textile effluent supplied from rinsing baths of Spanish textile industry. The influence of the reactive dyes molecular weights and the effect of the used membranes types and cut-offs were investigated with regard to the permeate flux at different transmembrane pressures (2-7. bar for UF and 4-15. bar for NF). The extent of colour retention, COD and conductivity was determined in order to monitor the membrane's separation efficiencies aiming at waste water treatment, water reuse and chemical usage minimisation. High COD retentions (80-100%) were achieved using UF and NF processes. Good conductivity rates (80%) and high COD and colour retention rates (>. 90%) were obtained for both NF 200 and NF 270 membranes for all studied dyes solutions. An improvement of the rinsing wastewater quality was obtained using UF and NF processes. © 2012 Elsevier B.V.


Fersi Bennani C.,Method and Technical Analysis Laboratory | M'hiri O.,Method and Technical Analysis Laboratory
Desalination and Water Treatment | Year: 2015

This study describes the rejection of heavy metal ions (Cu(II), Cd(II), and Zn(II)) using two commercial nanofiltration membranes (DL and DK). The effect of transmembrane pressure and metal concentration on the metal rejections and permeate flux was explored. The results showed that for DL membrane the maximum rejection was obtained at ΔP = 4 bar for all studied heavy metals. The rejections of Zn, Cu, and Cd were 93, 90, and 86%, respectively, when the concentration of each heavy metal was fixed to 10−5 mol/L and were 79, 76, and 78%, respectively, when the concentration of each heavy metal was fixed to 10−3 mol/L. The rejection sequence was identical for both membranes (RCu < RZn < RCd). However, the transmembrane pressure and the metal concentration had no great effect on rejection factors in the case of DK membrane. The variation of the permeate flux vs. the transmembrane pressure after treating different mixtures containing Cu(II), Cd(II), and Zn(II) metals by nanofiltration using DL and DK membranes was studied. A deviation from the straight line representing Jv vs. ΔP of different mixtures studied compared to pure water line was observed, but it was much more important in the case of DL membrane confirming a greater sensitivity to pores clogging. © 2013 Balaban Desalination Publications. All rights reserved.

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