Oily Wastewater Treatment

Othman, Mohd Hafiz Dzarfan; Tai, Zhong Sheng; Usman, Jamilu; Ismail, Nurul Jannah

doi:10.1007/978-3-030-52395-4_11

Cited by 4 publications

(3 citation statements)

References 116 publications

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“…Removal efficiencies will be negatively affected if less than the required amount of air is supplied whereas energy will be wasted if too much air is supplied; hence, an optimum supply should be employed thus making the A/S ratio an important parameter to be considered when designing air diffusers and flotation systems (Othman et al 2021). Flotation systems have no tool that satisfactorily expresses it due to system complexity and many unknowns (Tai & Doo 1997;El-Gohary et al 2010); therefore, designing of diffusers that distributes sufficient air is a necessity especially with the increased quantity and reduced quality of wastewater needing treatment.…”

Section: Suspended Solids Loading Rate Influencesmentioning

confidence: 99%

Influence of diffuser design on selected operating variables for wastewater flotation systems: a review

Mukandi

Basitere

Okeleye

et al. 2021

Water Practice and Technology

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Air diffusers or spargers have since been used in separation processes that include conventional wastewater treatment. Over the years, there has been advancements in diffuser design in terms of shape, pore size, orientation and materials of construction as a way of mitigating challenges such as fouling, clogging, energy consumption and poor system efficiency. Some of the available air diffusers are inadequate to solve most of these challenges due to reduced quality and increased quantity of wastewater being treated. Additionally, there is a paucity of information regarding air diffuser design and their effect on operational parameters in wastewater treatment. This review seeks to address the advancement in diffuser design and also the effects of design factors including parameters of air diffusers with a focus of their use in a column flotation system for wastewater treatment.

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Section: Suspended Solids Loading Rate Influencesmentioning

confidence: 99%

Influence of diffuser design on selected operating variables for wastewater flotation systems: a review

Mukandi

Basitere

Okeleye

et al. 2021

Water Practice and Technology

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“…1,2 Membrane-based processes are rapidly emerging as potential alternatives for addressing public sewage, municipal waste, and industrial wastewater owing to their low cost, high emulsion separation efficiency, lack of phase transition, eco-friendliness, and ease of use. 5 Polymeric membranes are widely adopted for many applications including desalination, wastewater treatment, and bioproduct purification. Nevertheless, in the process of separating oil and water, these membranes become fouled and blocked rapidly, with a notable occurrence of irreversible fouling.…”

Section: Introductionmentioning

confidence: 99%

Design and Machine Learning Prediction of In Situ Grown PDA-Stabilized MOF (UiO-66-NH₂) Membrane for Low-Pressure Separation of Emulsified Oily Wastewater

Usman,

Abba,

Baig

et al. 2024

ACS Appl. Mater. Interfaces

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Significant progress has been made in designing advanced membranes; however, persistent challenges remain due to their reduced permeation rates and a propensity for substantial fouling. These factors continue to pose significant barriers to the effective utilization of membranes in the separation of oil-in-water emulsions. Metal−organic frameworks (MOFs) are considered promising materials for such applications; however, they encounter three key challenges when applied to the separation of oil from water: (a) lack of water stability; (b) difficulty in producing defect-free membranes; and (c) unresolved issue of stabilizing the MOF separating layer on the ceramic membrane (CM) support. In this study, a defect-free hydrolytically stable zirconium-based MOF separating layer was formed through a two-step method: first, by in situ growth of UiO-66-NH 2 MOF into the voids of polydopamine (PDA)-functionalized CM during the solvothermal process, and then by facilitating the self-assembly of UiO-66-NH 2 with PDA using a pressurized dead-end assembly. A stable MOF separating layer was attained by enriching the ceramic support with amines and hydroxyl groups using PDA, which assisted in the assembly and stabilization of UiO-66-NH 2 . The PDA-s-UiO-66-NH 2 −CM membrane displayed air superhydrophilicity and underwater superoleophobicity, demonstrating its oil resistance and high antifouling behavior. The PDA-s-UiO-66-NH 2 −CM membrane has shown exceptionally high permeability and separation capacity for challenging oil-in-water emulsions. This is attributed to numerous nanochannels from the membrane and its high resistance to oil adhesion. The membranes showed excellent stability over 15 continuous test cycles, which indicates that the developed MOFs separating layers have a low tendency to be clogged by oil droplets during separation. Machine learning-based Gaussian process regression (GPR) models as nonparametric kernel-based probabilistic models were employed to predict the performance efficiency of the PDA-s-UiO-66-NH 2 −CM membrane in oil-in-water separation. The outcomes were compared with the support vector machine (SVM) and decision tree (DT) algorithm. This efficiency includes various metrics related to its separation accuracy, and the models were developed through feature engineering to identify and utilize the most significant factors affecting the membrane's performance. The results proved the reliability of GPR optimization with the highest prediction accuracy in the validation phase. The average percentage increase of the GPR model compared to the SVM and DT model was 6.11 and 42.94%, respectively.

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“…Oily wastewater containing organic pollutants is a significant environmental concern [ 3 , 4 , 5 ]. Conventional treatment methods such as flotation, coagulation, and biological treatment often fall short due to the dispersion and small size of oil droplets [ 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermally Reduced Graphene on the Characteristics and Performance of Polysulfone Mixed Matrix Ultrafiltration Membranes

Abdala,

Nabeeh,

Rehman

et al. 2023

Membranes

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Ultrafiltration (UF) polymeric membranes are widely used in water treatment and support desalination and gas separation membranes. In this article, we enhance the performance of Polysulfone (PSF) mixed matrix membranes (MMMs) by dispersing different concentrations of thermally reduced graphene (TRG) nanofillers. The UF PSF-TRG MMMs were fabricated via the phase inversion process, and the impact of TRG loading on the characteristics of the membrane, including hydrophilicity, porosity, roughness, and morphology, were analyzed using a contact angle measurement, atomic force microscopy (AFM), scanning electron microscopy (SEM), and dynamic mechanical analysis. Incorporating TRG into the PSF matrix led to favorable effects in the instantaneous de-mixing during phase inversion, increasing the porosity and hydrophilicity of MMMs and improving the mechanical properties of the membranes. Moreover, membrane performance was examined to remove dispersed oil from oil–water emulsion and support air-dehumidification membranes. MMM performance in terms of flux and oil rejection was superior to the control PSF membrane. Incorporating 0.25% TRG into PSF resulted in a 70% water flux increase and higher oil rejection compared to the control PSF membrane. As a support for air-dehumidification membranes, the MMM also demonstrated enhanced humidity reduction and an over 20% increase in water vapor permeance over the control PSF membrane. These results indicate that the PSF-TRG MMMs are an excellent candidate for reliable oil–water separation and as a support for air-dehumidification membranes.

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Oily Wastewater Treatment

Cited by 4 publications

References 116 publications

Influence of diffuser design on selected operating variables for wastewater flotation systems: a review

Influence of diffuser design on selected operating variables for wastewater flotation systems: a review

Design and Machine Learning Prediction of In Situ Grown PDA-Stabilized MOF (UiO-66-NH₂) Membrane for Low-Pressure Separation of Emulsified Oily Wastewater

Effect of Thermally Reduced Graphene on the Characteristics and Performance of Polysulfone Mixed Matrix Ultrafiltration Membranes

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Oily Wastewater Treatment

Cited by 4 publications

References 116 publications

Influence of diffuser design on selected operating variables for wastewater flotation systems: a review

Influence of diffuser design on selected operating variables for wastewater flotation systems: a review

Design and Machine Learning Prediction of In Situ Grown PDA-Stabilized MOF (UiO-66-NH2) Membrane for Low-Pressure Separation of Emulsified Oily Wastewater

Effect of Thermally Reduced Graphene on the Characteristics and Performance of Polysulfone Mixed Matrix Ultrafiltration Membranes

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Design and Machine Learning Prediction of In Situ Grown PDA-Stabilized MOF (UiO-66-NH₂) Membrane for Low-Pressure Separation of Emulsified Oily Wastewater