Greywater reclamation: A comparison of the treatment performance of UiO-66-NH2@GO nanocomposites membrane filtration with and without activated carbon pretreatment

Matebese, Funeka; Moutloali, Richard M.

doi:10.1016/j.jece.2020.104906

Cited by 19 publications

(11 citation statements)

References 59 publications

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“…(a, b, d, and e) SEM micrographs showing the surface and cross-section morphology of Z4 and Z5 membranes and (c and f) AFM images of Z4 and Z5 membranes. Reused with permission from ref . Elsevier Ltd. 2021.…”

Section: Resultsmentioning

confidence: 99%

Integrating Ultrafiltration Membranes with Flocculation and Activated Carbon Pretreatment Processes for Membrane Fouling Mitigation and Metal Ion Removal from Wastewater

Matebese

Moutloali

2023

ACS Omega

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The presence of metal ions in an aqueous medium is an ongoing challenge throughout the world. Processes employed for metal ion removal are developed continuously with the integration of these processes taking center stage. Herein, an integrated system consisting of flocculation, activated carbon (AC), and an ultrafiltration (UF) membrane was assessed for the removal of multiple metal ions contained in wastewater generated from a university chemistry research laboratory. The quality of the wastewater was established before and further determined after treatment with inductively coupled plasma optical emission spectrometry (ICP-OES) for metal content, total dissolved solids (TDS), turbidity, electrical conductivity (EC), and pH. Assessing the spent AC indicated minimal structural changes, indicating a potential for further reuse; for instance, the BET for both the pristine and spent AC exhibited type I isotherms with a mesoporous structure, indicating no major structural changes due to metal complexation. The relative performance of the integrated system indicated that the use of flocculation improved the water quality of metal-laden wastewater for safe disposal. The integrated treatment systems exhibited high removal efficiencies between 80 and 99.99% for all the metal ions except for Mn (<0.008 mg L–1) and Cr (<0.016 mg L–1) both at ca. 70%, indicative of the positive influence of the polyelectrolyte in the treatment process. The fabricated UiO-66-NH2@GO membranes (Z4 and Z5) exhibited high fouling resistance and reusability potential as well as relatively high pure water flux. Consequently, the integrated process employed for the treatment of laboratory metal-containing wastewater is promising as a generic approach to improving the quality of metal-containing wastewater to meet the standards of discharging limits in South Africa.

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Section: Resultsmentioning

confidence: 99%

Integrating Ultrafiltration Membranes with Flocculation and Activated Carbon Pretreatment Processes for Membrane Fouling Mitigation and Metal Ion Removal from Wastewater

Matebese

Moutloali

2023

ACS Omega

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“…Membrane combinations of different systems allow more efficient oil separation. [64] The oil waste is permeable at a broader range of concentrations without system poisoning. [65] These advantages usually are more expensive but are repayable in a short time due to the utilization of more wastes for reuse.…”

Section: Membrane Combination With Different Systemsmentioning

confidence: 99%

“…A generalized design for a UF membrane-based system with different www.advmatinterfaces.de cost-effective pretreatment techniques is demanded. [64] Finally, to effectively reduce membrane fouling and pore-blockage, membrane hydrophilicity is essential for improved within dynamic water (underwater) contact angle at almost 0 s at a temperature below 10 °C. [123,152] That is called a "super hydrophilic membrane".…”

Section: Current Status In Membrane Industry Serving Oil-water Emulsion Treatment and Future Strategy For Researchmentioning

confidence: 99%

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Shalaby

Sołowski

Abbas

2021

Adv Materials Inter

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found with other insoluble matter, presenting relevant problems with safe and convenient separation. The legal discharge of oil-water emulsions is a complex process. [4] Thus, environmental authorities have established stringent regulations to cope with it. [5] Depending on countries, the oil limits are concentrations below 40 ppm as in Vietnam, [6] and in other countries like Korea, the maximum is only five ppm of oil in discharge. [7] Generally, the oil phase in water has three forms, based on oil droplets, size of more than 150 micrometers is called free oil, but that size found from 50 to 150 micrometers is the dispersed oil, [8] finally, the emulsified oil less than 20 µm. There is an increasing interest in employing membrane technology for filtering smaller size oil droplets. In this review, oil-water emulsion problems are highlighted with oil-water separation techniques selection and their performance with varied oil concentration and composition of other immiscible or miscible components. [9] Membrane technology is known formerly to economically advantageous for oily wastewater (OWW) treatment compared with other conventional technologies. [9] Based on the literature, the membranebased treatment cost estimation was about 1 and 3 $ m −3 , [10] lower than for dissolved air floatation (DAF) treatment (cost was 3.65 $ m −3 ). Generally, the treatment cost depends on OWW sources, as each industry has its specific blends for oil and grease jointly with other membrane foulants. [11] For example, oil-water emulsions treatment from the fatty acid industry has a total capital cost (costs of membranes, electricity, labor, cleaning, and maintenance) of 2.65 $ m −3 , compared with the railroad industry (it was ranged from 1.03 to 1.48 $ m −3 ). These costs for the metalworking OWW using UF were 2.8 $ m −3 . In microfiltration (MF) membrane, the OWW membrane-based treatment for oil concentration of 50 ppm annual cost was estimated as 0.098 $ m −3 with a feed rate of 100 m 3 day −1 . [9] The cost of membrane-based treatment of OWW is generally varying but is lower than conventional technologies. [12] 1.1. Oil-Water Emulsions Sources, Environmental Hazard, and Discharge Limits An oil-water emulsion is either a waste stream product, or secondary product. These effluents are generated from different areas and industrial sectors like the petroleum& gas sector, food processing, shipping facilities and maritime, and many others Oily wastewater is generated by various industries in extraordinary growing volumes, such as oil refineries, petrochemicals, metallurgical, food & beverages, and dairy industries, which need oil removal for safe discharge to the environment. Lower cost of production with high oil removal and efficient performance compared to classical methods for treating oil-water emulsions attributed to the alleviation of operation. That emphasizes membrane modification to enhance wettability, hydrophilicity with the antifouling property such as membranes dealing with tiny oil emulsions to be the key parameters to im...

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“…22,23 Design of membrane materials plays a key role in membrane separation. 24,25 Various kinds of membranes prepared by porous polymer, 26−30 graphene derivatives, 31−33 and alternative composite materials 34,35 have been developed for separation of inorganic ions in aqueous solutions. Among them, the membranes prepared by graphene and its derivatives show huge potential in ion separation.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Membrane separation, without the introduction of additives and phase change, is an emerging technology with pollution-free and high-efficiency, which is considered as the most promising strategy and route of ion separation for future industrial applications. , Design of membrane materials plays a key role in membrane separation. , Various kinds of membranes prepared by porous polymer, − graphene derivatives, − and alternative composite materials , have been developed for separation of inorganic ions in aqueous solutions. Among them, the membranes prepared by graphene and its derivatives show huge potential in ion separation.…”

Section: Introductionmentioning

confidence: 99%

Metal–Organic Framework-Intercalated Graphene Oxide Membranes for Selective Separation of Uranium

et al. 2021

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Design and construction of a membrane that can achieve selective separation of uranium from spent fuel or seawater is a big challenge in the field of separation science. In this work, 1,3,5-benzenetricarboxylic acid (BTC) and three different nitrates (Zn/Ni/Cu) were used to prepare metal−organic frameworks (BTC−MOFs) with different pore sizes, and then, BTC−MOFs were intercalated into the interlayers of graphene oxide (GO) for preparing the composite membranes which presented selective separation of uranium with strong acid resistance. Composite membranes prepared by Zn/Ni/Cu-BTC−MOFs and GO can achieve the separation between ions of different valence states, and their permeability and selectivity depend on the membrane thickness, the acidity of driving solution, and the pore sizes of MOFs. Importantly, Cu-BTC−MOF-intercalated GO membranes can not only achieve the selective separation of Th 4+ and UO 2 2+ with a selectivity of ≈6 but also induce the ultra-high selectively separation of UO 2 2+ and Ce 3+ because the rejection rate of Ce 3+ is about 100%. Moreover, the Zn-BTC−MOF-intercalated GO membrane shows an excellent selectivity of Th 4+ and UO 2 2+ with a selectivity of ≈25, and it may also achieve selective separation of uranium from seawater.

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Greywater reclamation: A comparison of the treatment performance of UiO-66-NH2@GO nanocomposites membrane filtration with and without activated carbon pretreatment

Cited by 19 publications

References 59 publications

Integrating Ultrafiltration Membranes with Flocculation and Activated Carbon Pretreatment Processes for Membrane Fouling Mitigation and Metal Ion Removal from Wastewater

Integrating Ultrafiltration Membranes with Flocculation and Activated Carbon Pretreatment Processes for Membrane Fouling Mitigation and Metal Ion Removal from Wastewater

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Metal–Organic Framework-Intercalated Graphene Oxide Membranes for Selective Separation of Uranium

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