Synthesis, characterization and performance studies of polysulfone and polysulfone/polymer-grafted bentonite based ultrafiltration membranes for the efficient separation of oil field oily wastewater

Oily wastewater is an extensive source of pollution to soil and water, and its harmless treatment is of great importance for the protection of our aquatic ecosystems. Membrane filtration is highly desirable for removing oil from oily water because it has the advantages of energy efficiency, easy processing and low maintenance cost. However, membrane fouling during filtration leads to severe flux decline and impedes long-term operation of membranes in practical wastewater treatment. Membrane fouling includes reversible fouling and irreversible fouling. The fouling mechanisms have been explored based on classical fouling models, and on oil droplet behaviors (such as droplet deposition, accumulation, coalescence and wetting) on the membranes. Membrane fouling is dominated by droplet-membrane interaction, which is influenced by the properties of the membrane (e.g., surface chemistry, structure and charge) and the wastewater (e.g., compositions and concentrations) as well as the operation conditions. Typical membrane antifouling strategies, such as surface hydrophilization, zwitterionic polymer coating, photocatalytic decomposition and electrically enhanced antifouling are reviewed, and their cons and pros for practical applications are discussed.

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“…are dispersed into the membrane matrix for membrane preparation. [23,47,52,56,94,98,111,113,121,122]…”

Section: General Method: Improving Surface Hydrophilicitymentioning

confidence: 99%

Antifouling membranes for oily wastewater treatment: Interplay between wetting and membrane fouling

Huang

Ras

Tian

2018

Current Opinion in Colloid & Interface Science

286

113

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“…Foam with 2.0 wt% bentonite showed very good results of viscosity, that is, 245 mPa s, while foam without bentonite showed viscosity 190 mPa s at 90°C. The suspended bentonite clay particles showed a synergistic effect with guar, which enhanced the viscosity of base fluids by grafting on the polymer interface at higher temperature and strengthening the gas–liquid interface …”

Section: Resultsmentioning

confidence: 99%

“…The suspended bentonite clay particles showed a synergistic effect with guar, which enhanced the viscosity of base fluids by grafting on the polymer interface at higher temperature and strengthening the gas-liquid interface. [48][49][50] The temperature and viscosity variation can be expressed with Arrhenius equation as…”

Section: Foam Rheological Behaviormentioning

confidence: 99%

Synergistic effects of polymer and bentonite clay on rheology and thermal stability of foam fluid developed for hydraulic fracturing

Verma

Chauhan

Ojha

2017

Asia-Pacific J Chem Eng

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Demand for foam fracturing fluids is ever‐increasing because of its nondamaging characteristics, less water requirement, combined with efficient proppant carrying capacity. The present study reported the synergistic effects of bentonite clay and polymer (guar) on rheology and stability of the foam prepared with surfactant (sodium dodecyl sulfate). Bentonite clay, which is never considered so far for improving quality of foam fracturing fluid, was found to provide improved foam rheology at reduced polymer concentration. Static and dynamic rheology with microscopic study showed the improvement of apparent viscosity, viscoelasticity, thermal stability, and morphology of foam on addition of bentonite clay. Addition of bentonite reduced the doses of polymer with similar proppant suspension capacity, which could be preferred over conventional gelled foam to reduce formation damage incurred by insoluble guar in the very low permeability unconventional reservoirs like shale gas, coal bed methane, or water‐sensitive formations. © 2017 Curtin University and John Wiley & Sons, Ltd.

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“…The current study sought to examine the efficacy of sodium bentonite-clay (BC) mixtures for reducing infiltration in high permeability regions, in concurrence with decontamination of recharge derived from reclaimed wastewater. Sodium bentonite is a readily available and inexpensive material, characterised by a large surface area, which in tandem with its positive ionic exchange capacity and adsorptive properties has been shown to influence the transport and removal of contaminants (Putra et al, 2009;Kumar et al, 2016). To date, this represents the first specific investigation of reclaimed wastewater infiltration and decontamination at the meso-scale.…”

Section: Discussionmentioning

confidence: 99%

“…high levels of organic compounds, including nitrogen, phosphorous, and chemical/biochemical oxygen demand), in concurrence with increasing infiltration rates due to climate change, subsequently leading to decreased subsurface retention and natural attenuation, has resulted in elevated contamination risks to local aquifers and wells (Rose, 2007;Li et al, 2012;Bischel et al, 2013;Chhipi-Shrestha et al, 2017). Previous studies have shown that via a series of physical, chemical and biological mechanisms, contaminants in percolating recharge water may be removed by riverbed media (Drzyzga & Blotevogel, 1997;Rauch-Williams & Drewes, 2006;Kumar et al, 2016). The elevated cation exchange capacity (CEC) of bentonite clays and other pillared forms of bentonite result in a high contaminant adsorption capacity; previous studies have shown bentonite to be an effective solid adsorption media with respect to iron nanoparticles (Shi et al, 2011), phosphates (Haghseresht et al, 2009), ammonia (Zhou et al, 2015) and…”

Section: Introductionmentioning

confidence: 99%

Organic contaminant removal efficiency of sodium bentonite/clay (BC) mixtures in high permeability regions utilizing reclaimed wastewater: A meso-scale study

Yang

Ning

et al. 2018

Journal of Contaminant Hydrology

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Wastewater reclamation now represents an effective measure for sustainable water resource management in arid regions, however wastewater components (organic micropollutants) may potentially impact local ecological and/or human health. Previous studies have shown that sodium bentonite/natural clay (BC) mixes may be used to effectively reduce riverbed infiltration in regions characterized by excessively high hydraulic conductivity. Accordingly, the current study sought to investigate the contaminant removal efficiency (Re) of several BC mass ratios in simulated dry riverbeds. Results indicate that the measured Re of NH-N, COD and BOD increased in concurrence with an increasing sodium bentonite ratio, up to a maximum Re of 97.4% (NH-N), 55.2% (COD), and 51.5% (BOD). The primary contaminant removal site was shown to be the infiltration-reducing (BC) layer, accounting for approximately 40%, 60%, and 70% of NH-N, COD and BOD removal, respectively. Conversely, the removal efficiency of NO-N was found to be low (<15%), while total phosphorous (TP) was found to actively leach from the infiltration-reduction layer, resulting in measured TP discharges 2.4-4.8 times those of initial infiltration values. The current study provides a technical baseline for the efficacy of sodium bentonite as an effective bi-functional material in areas utilizing reclaimed water i.e. concurrent reduction of infiltration rates (Function 1) and decontamination of reclaimed wastewater infiltration/recharge (Function 2). Findings indicate that sodium bentonite-clay mixes may represent a feasible alternative for managing recharge of non-potable aquifers with reclaimed wastewater.

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Synthesis, characterization and performance studies of polysulfone and polysulfone/polymer-grafted bentonite based ultrafiltration membranes for the efficient separation of oil field oily wastewater

Cited by 61 publications

References 35 publications

Antifouling membranes for oily wastewater treatment: Interplay between wetting and membrane fouling

Antifouling membranes for oily wastewater treatment: Interplay between wetting and membrane fouling

Synergistic effects of polymer and bentonite clay on rheology and thermal stability of foam fluid developed for hydraulic fracturing

Organic contaminant removal efficiency of sodium bentonite/clay (BC) mixtures in high permeability regions utilizing reclaimed wastewater: A meso-scale study

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