Low-cost composite ultrafiltration membrane made from TiO2 and nanocomposite clay materials over zeolite support for oily wastewater purification and heavy metals removal

Aloulou, Wala; Aloulou, Hajer; Amar, Raja Ben

doi:10.5004/dwt.2022.28027

Cited by 9 publications

(9 citation statements)

References 41 publications

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“…The content of the oil and heavy metals retention was measured by determining the concentration in the feed and solutions using a UV-spectrophotometer (UV-9200) at a wavelength of 363 nm and atomic absorption spectroscopy (AAS), respectively. For the evaluation of UF rejection, the rejection of the different parameters (COD, turbidity, oil and heavy metals) was determined by Equation1 [43]:…”

Section: Ultrafiltration Experimentsmentioning

confidence: 99%

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Development of Ultrafiltration Kaolin Membranes over Sand and Zeolite Supports for the Treatment of Electroplating Wastewater

Aloulou

Duplay

et al. 2022

Membranes

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A high cost of high-purity materials is one of the major factors that limit the application of ceramic membranes. Consequently, the focus was shifted to using natural and abundant low-cost materials such as zeolite, clay, sand, etc. as alternatives to well-known pure metallic oxides, such as alumina, silica, zirconia and titania, which are usually used for ceramic membrane fabrication. As a contribution to this area, the development and characterization of new low-cost ultrafiltration (UF) membranes made from natural Tunisian kaolin are presented in this work. The asymmetric ceramic membranes were developed via layer-by-layer and slip-casting methods by direct coating on tubular supports previously prepared from sand and zeolite via the extrusion process. Referring to the results, it was found that the UF kaolin top layer is homogenous and exhibits good adhesion to different supports. In addition, the kaolin/sand and kaolin/zeolite membranes present an average pore diameter in the range of 4–17 nm and 28 nm, and water permeability of 491 L/h.m2.bar and 182 L/h.m2.bar, respectively. Both membranes were evaluated in their treatment of electroplating wastewater. This was done by removing oil and heavy metals using a homemade crossflow UF pilot plant operated at a temperature of 60 °C to reduce the viscosity of the effluent, and the transmembrane pressure (TMP) of 1 and 3 bar for kaolin/sand and kaolin/zeolite, respectively. Under these conditions, our membranes exhibit high permeability in the range of 306–336 L/h.m2.bar, an almost total oil and lead retention, a retention up to 96% for chemical oxygen demand (COD), 96% for copper and 94% for zinc. The overall data suggest that the developed kaolin membranes have the potential for remediation of oily industrial effluents contaminated by oil and heavy metals.

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Section: Ultrafiltration Experimentsmentioning

confidence: 99%

“…The viscosity of the raw effluent at 25 • C and 60 • C was measured by a rotary viscosimeter Tve-05 (LAMY) because 60 • C was selected as a suitable temperature for the purification of this type of oily wastewater in a previous work [43].…”

Section: Ultrafiltration Experimentsmentioning

confidence: 99%

Development of Ultrafiltration Kaolin Membranes over Sand and Zeolite Supports for the Treatment of Electroplating Wastewater

Aloulou

Duplay

et al. 2022

Membranes

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“…All tests were performed under a transmembrane pressure and temperature ranges from 2 to 5 bar and 20 to 60 °C. The permeate flux was calculated according to the following equation [ 49 ]:

where J w is the permeate flux (L/m 2 h), V is the volume of permeate (L), S is the membrane surface area (m 2 ), and t is the duration of ultrafiltration (h).…”

Section: Methodsmentioning

confidence: 99%

“…The membrane water permeability was 230 L/h•m 2 •bar. All tests were performed under a transmembrane pressure and temperature ranges from 2 to 5 bar and 20 to 60 • C. The permeate flux was calculated according to the following equation [49]:…”

Section: Ultrafiltration Processmentioning

confidence: 99%

Statistical Simulation, a Tool for the Process Optimization of Oily Wastewater by Crossflow Ultrafiltration

et al. 2022

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This work aims to determine the optimized ultrafiltration conditions for industrial wastewater treatment loaded with oil and heavy metals generated from an electroplating industry for water reuse in the industrial process. A ceramic multitubular membrane was used for the almost total retention of oil and turbidity, and the high removal of heavy metals such as Pb, Zn, and Cu (>95%) was also applied. The interactive effects of the initial oil concentration (19–117 g/L), feed temperature (20–60 °C), and applied transmembrane pressure (2–5 bar) on the chemical oxygen demand removal (RCOD) and permeate flux (Jw) were investigated. A Box–Behnken experimental design (BBD) for response surface methodology (RSM) was used for the statistical analysis, modelling, and optimization of operating conditions. The analysis of variance (ANOVA) results showed that the COD removal and permeate flux were significant since they showed good correlation coefficients of 0.985 and 0.901, respectively. Mathematical modelling revealed that the best conditions were an initial oil concentration of 117 g/L and a feed temperature of 60 °C, under a transmembrane pressure of 3.5 bar. In addition, the effect of the concentration under the optimized conditions was studied. It was found that the maximum volume concentrating factor (VCF) value was equal to five and that the pollutant retention was independent of the VCF. The fouling mechanism was estimated by applying Hermia’s model. The results indicated that the membrane fouling given by the decline in the permeate flux over time could be described by the cake filtration model. Finally, the efficiency of the membrane regeneration was proved by determining the water permeability after the chemical cleaning process.

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“…Thermodynamic properties, such as enthalpy, entropy and the free energy were also estimated to provide insight into the adsorption mechanism during the adsorption removal of the chromium. These NP are used in different applications such as membrane separation [15,[21][22][23], hybrid system and adsorption [24] to treat different effluents. High performances of these NP encourage their use in the elimination of heavy metals by adsorption.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of TiO2/smectite nanoparticles as an alternative low-cost adsorbent for chromium removal from industrial wastewater

Aloulou¹,

Aloulou²,

Romdhani³

et al. 2023

Desalination and Water Treatment

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In this work, chromium removal efficiency from electroplating industry wastewater was studied by adsorption using TiO 2 /smectite nanoparticles (NP) synthesized by modification of natural smectite by colloidal route. The effect on chromium adsorption of adsorbent dose, pH, contact time, temperature and initial concentration was then determined in batch system. Chromium concentration can be reduced to 24 mg/L (70%) under the experimental condition (pH = 2.9, adsorbent dose = 1.6 g/L, contact time = 75 min, T = 298 K and C 0 = 80 mg/L) when initial chromium concentration of 80 mg/L is employed. The chromium adsorption on NP was described by the Langmuir isotherm and the maximum chromium adsorption capacity was found as 35 mg/g. Kinetics data were best described by the pseudo-second-order model. The thermodynamic studies proved that the adsorption was exothermic and spontaneous.

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Low-cost composite ultrafiltration membrane made from TiO2 and nanocomposite clay materials over zeolite support for oily wastewater purification and heavy metals removal

Cited by 9 publications

References 41 publications

Development of Ultrafiltration Kaolin Membranes over Sand and Zeolite Supports for the Treatment of Electroplating Wastewater

Development of Ultrafiltration Kaolin Membranes over Sand and Zeolite Supports for the Treatment of Electroplating Wastewater

Statistical Simulation, a Tool for the Process Optimization of Oily Wastewater by Crossflow Ultrafiltration

Evaluation of TiO2/smectite nanoparticles as an alternative low-cost adsorbent for chromium removal from industrial wastewater

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