A Review on Adsorption Process for the Treatment of Oily Wastewater

Teow, Yeit Haan; Nordin, Puteri Mimie Isma; Juanda, Nur ‘Izzah Ahmad; Shafi, Muhammad Afiq Mohd; Krishnan, Pavithiran

doi:10.21926/aeer.2301016

Cited by 5 publications

(1 citation statement)

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“…Moreover, chemical destabilization (coagulation/flocculation) methods are also widely used to enhance the efficiency of the previously mentioned techniques. However, for the efficient elimination of dissolved and emulsified oil droplets, advanced methods are required, such as adsorption [9], advanced oxidation processes [10], or membrane filtration [11]. These methods can be employed as a complement to conventional wastewater treatment techniques or independently to enhance treatment efficacy.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic and Filtration Performance of TiO2-Ag Composite-Coated Membrane Used for the Separation of Oil Emulsions

Fazekas,

Gyulavári,

Ágoston

et al. 2024

Separations

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Polyvinylidene fluoride (PVDF) membranes were coated with TiO2 and TiO2-Ag to enhance their efficiency for oil-in-water emulsion separation. The photocatalytic activities of the two modified membranes and their filtration performances were compared in detail. The significantly enhanced photocatalytic activity of the TiO2-Ag composite was proved using a methyl orange (MO) solution (c = 10−5 M) and a crude oil emulsion (c = 50 mg·L−1). The TiO2-Ag-coated membrane reduced the MO concentration by 87%, whereas the TiO2-modified membrane reached only a 46% decomposition. The photocatalytic reduction in the chemical oxygen demand of the emulsion was also ~50% higher using the TiO2-Ag-coated membrane compared to that of the TiO2-coated membrane. The photoluminescence measurements demonstrated a reduced electron/hole recombination, achieved by the Ag nanoparticle addition (TiO2-Ag), which also explained the enhanced photocatalytic activity. A significant improvement in the oil separation performance with the TiO2-Ag-coated membrane was also demonstrated: a substantial increase in the flux and flux recovery ratio (up to 92.4%) was achieved, together with a notable reduction in the flux decay ratio and the irreversible filtration resistance. Furthermore, the purification efficiency was also enhanced (achieving 98.5% and 99.9% COD and turbidity reductions, respectively). Contact angle, zeta potential, scanning electron microscopy (SEM), and atomic force microscopy (AFM) measurements were carried out to explain the results. SEM and AFM images revealed that on the TiO2-Ag-coated membrane, a less aggregated, more continuous, homogeneous, and smoother nanolayer was formed due to the ~50% more negative zeta potential of the TiO2-Ag nanocomposite compared to that of the TiO2. In summary, via Ag addition, a sufficiently hydrophilic, beneficially negatively charged, and homogeneous TiO2-Ag-coated PVDF membrane surface was achieved, which resulted in the presented advantageous filtration properties beyond the photocatalytic activity enhancement.

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Section: Introductionmentioning

confidence: 99%