Nanofiltration as tertiary treatment for the reuse of dairy wastewater treated by membrane bioreactor

Andrade, Laura Hamdan de; Mendes, F.D.; Espíndola, Jonathan C.; Amaral, Míriam Cristina Santos

doi:10.1016/j.seppur.2014.01.056

Cited by 138 publications

(74 citation statements)

References 44 publications

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“…The distinguishing characteristics of NF membranes -such as their ability to retain small organic molecules, higher selectivity towards monovalent ions, in addition to lower operating pressures and higher fluxes compared to RO membranes -promoted their adoption across a wide spectrum of applications, ranging from water and wastewater treatment [2,3,4] to food and textile engineering [5,6,7] as well as pharmaceutical and biotechnology applications [8,9,10]. A recent review by Mohammad et al…”

Section: Introductionmentioning

confidence: 99%

Fundamentals of low-pressure nanofiltration: Membrane characterization, modeling, and understanding the multi-ionic interactions in water softening

Labban

Liu

Chong

et al. 2017

Journal of Membrane Science

152

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Recently, a novel class of low-pressure nanofiltration (NF) hollow fiber membranes, particularly suited for water softening and desalination pretreatment have been fabricated in-house using layer-by-layer (LbL) deposition with chemical crosslinking. These membranes can operate at exceedingly low pressures (2 bar), while maintaining relatively high rejections of multivalent ions. In spite of their great potential, our understanding as to what makes them superior has been limited, demanding further investigation before any large-scale implementation can be realized. In this study, the Donnan-Steric Pore Model with dielectric exclusion (DSPM-DE) is applied for the first time to these membranes to describe the membrane separation performance, and to explain the observed rejection trends, including negative rejection, and their underlying multi-ionic interactions. Experiments were conducted on a spectrum of feed chemistries, ranging from uncharged solutes to single salts, salt mixtures, and artificial seawater to characterize the membrane and accurately predict its performance. Modeling results were validated with experiments, and then used to elucidate the working principles that underlie the low-pressure softening process. An approach based on sensitivity analysis shows that the membrane pore dielectric constant, followed by the pore size, are primarily responsible for the selectively high rejections of the NF membranes to multivalent ions. Surprisingly, the softening process is found to be less sensitive to changes in membrane charge density. Our findings demonstrate that the unique ability of these membranes to exclusively separate multivalent ions from the solution, while allowing monovalent ions to permeate, is key to making this low-pressure softening process realizable.

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Section: Introductionmentioning

confidence: 99%

Fundamentals of low-pressure nanofiltration: Membrane characterization, modeling, and understanding the multi-ionic interactions in water softening

Labban

Liu

Chong

et al. 2017

Journal of Membrane Science

152

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“…It was in the shape of a plexiglas cuboid. During these studies the treated wastewater was pumped from raw sewage tank to the reaction chamber with activated sludge, whose volume was at 20 dm 3 . In the chamber the capillary ultrafiltration module was installed.…”

Section: Apparatusmentioning

confidence: 99%

Effect of Pac on MBR Performance During the Treatment of Synthetic Wastewater Containing Organic Compounds

Skorek‐Osikowska

Uchman

Werle

2017

Architecture, Civil Engineering, Environment

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A b s t r a c tThe aim of this study was to determine the effect of powdered activated carbon on fouling intensity of capillary membranes working in the submerged membrane bioreactor during the treatment of synthetic municipal wastewater loaded with organic compounds. The research were carried out in a membrane bioreactor including a capillary ultrafiltration module made of polyethersulfone. The feed used in the presented study was synthetic municipal wastewater which was prepared in order to include high organic content. Moreover, the volumetric flux of the treated wastewater and the percentage of reversible and irreversible fouling were determined. It was found that activated carbon addition to a membrane bioreactor (MBR) treating wastewater reduced irreversible fouling. The volumetric flux of the treated wastewater for PAC-assisted MBRs was higher by approximately 40% as compared to the volumetric flux of the treated wastewater without any sorbents. S t r e s z c z e n i e Celem niniejszej pracy było określenie wpływu dodatku sproszkowanego węgla aktywnego na intensywność zjawiska foulingu membran kapilarnych zanurzonych w bioreaktorze membranowym podczas oczyszczania syntetycznych ścieków komunalnych obciążonych związkami organicznymi. Badania prowadzono w bioreaktorze membranowym z zanurzonym ultrafiltracyjnym modułem kapilarnym wykonanym z polieterosulfonu. Substratem badań były syntetyczne ścieki komunalne, preparowane tak aby charakteryzowały się wysoką zawartością związków organicznych. W trakcie prowadzenia badań wyznaczano objętościowy strumień ścieków oczyszczonych oraz procentowy udział foulingu całkowitego, który jest sumą foulingu odwracalnego i nieodwracalnego. Wykazano, że dodatek węgla aktywnego do bioreaktora membranowego zmniejszył intensywność nieodwracalnego zjawiska blokowania membran. Objętościowy strumień ścieków oczyszczonych w obecności PAC były wyższy w porównaniu do strumienia ścieków oczyszczonych bez dodatku sorbentu średnio 40%.

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“…Water permeability of the clean NF90 membrane had an average value of 2.3 L/h.m 2 .bar, indicating that it was a tightly packed NF membrane (Krieg et al, 2004;Yüksel et al, 2013). The filtration took place at a pressure of 10 bar, feed cross-flow velocity of 7.8m/s, and permeate recovery rate of 45%, defined as the optimal conditions by Andrade et al (2014). Permeate flux was monitored by measuring the volume of permeate generated in a given time interval.…”

Section: Figurementioning

confidence: 99%

“…However, there are few studies that address the treatment of end-of-pipe wastewater, especially aiming at its reuse in cleaning processes and auxiliary purposes (Sakar et al, 2006;Luo et al, 2011;Andrade et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, it has lower pressure requirements and higher flux compared to reverse osmosis (Suksaroj et al, 2008). Studies show that NF is an efficient treatment system for secondary or tertiary effluents aiming at the generation of water for industrial, agricultural, or indirect potable reuse (Koyuncu et al, 2000;Dresch et al, 2001;Shu et al, 2005;Acero et al, 2010;Jacob et al, 2010;Luo et al, 2011;Riera et al, 2013;Andrade et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reuse of Dairy Wastewater Treated by Membrane Bioreactor and Nanofiltration: Technical and Economic Feasibility

Andrade¹,

Mendes²,

Espíndola³

et al. 2015

Braz. J. Chem. Eng.

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-This study evaluated the technical and economic feasibility of membrane bioreactors (MBR) followed by nanofiltration (NF) for dairy wastewater treatment in order to reuse the treated effluent. It was observed that the MBR efficiently removed the organic matter and color of the feed effluent; however, due to the high concentration of dissolved solids in the permeate, it was necessary to use nanofiltration as a polishing step. The final treated effluent could be reused in the industry for cooling, steam generation and cleaning of external areas. A preliminary economic analysis showed the feasibility of the proposed system. The internal rate of return was greater than or equal to 32% when membrane lifespan was at least 2 years and the depreciation time was 15 years. The total cost of the proposed treatment system ranged from R$ 9.99/m³ to R$ 6.82/m³, depending on membrane lifespan.

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Nanofiltration as tertiary treatment for the reuse of dairy wastewater treated by membrane bioreactor

Cited by 138 publications

References 44 publications

Fundamentals of low-pressure nanofiltration: Membrane characterization, modeling, and understanding the multi-ionic interactions in water softening

Fundamentals of low-pressure nanofiltration: Membrane characterization, modeling, and understanding the multi-ionic interactions in water softening

Effect of Pac on MBR Performance During the Treatment of Synthetic Wastewater Containing Organic Compounds

Reuse of Dairy Wastewater Treated by Membrane Bioreactor and Nanofiltration: Technical and Economic Feasibility

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