Permeation characteristics of volatile fatty acids solution by forward osmosis

Jung, Kwonsu; Choi, Jin‐dal‐rae; Lee, Doyeon; Seo, Charles; Lee, JeongWook; Lee, Sang Yup; Chang, Ho Nam; Kim, Yeu‐Chun

doi:10.1016/j.procbio.2015.01.016

Cited by 24 publications

(9 citation statements)

References 43 publications

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“…In the FO experiments, the permeance was affected by pH ( Table 8 ). A higher pH resulted in a higher permeance as Jung et al also found [ 41 ]. The retention of each acid was affected by the concentration of given compounds, although this effect was below statistical significance for acetic acid.…”

Section: Resultsmentioning

confidence: 70%

“…For feed solutions having lower osmotic potential which need dewatering (e.g., juice concentration), seawater, especially concentrated seawater from desalination plants, provides an economic and environmentally friendly, low-carbon footprint solution with obvious geographical limitations. VFA solutions, including real wastewater, can be effectively dewatered by FO [ 41 , 42 ], thanks to the tight nature of the membranes.…”

Section: Introductionmentioning

confidence: 99%

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Separation of Volatile Fatty Acids from Model Anaerobic Effluents Using Various Membrane Technologies

et al. 2020

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Effluents of anaerobic processes still contain valuable components, among which volatile fatty acids (VFAs) can be regarded and should be recovered and/or used further in applications such as microbial electrochemical technology to generate energy/energy carriers. To accomplish the separation of VFAs from waste liquors, various membrane-based solutions applying different transport mechanisms and traits are available, including pressure-driven nanofiltration (NF) and reverse osmosis (RO) which are capable to clarify, fractionate and concentrate salts and organics. Besides, emerging techniques using a membrane such as forward osmosis (FO) and supported liquid membrane (SILM) technology can be taken into consideration for VFA separation. In this work, we evaluate these four various downstream methods (NF, RO, FO and SILM) to determine the best one, comparatively, for enriching VFAs from pH-varied model solutions composed of acetic, butyric and propionic acids in different concentrations. The assessment of the separation experiments was supported by statistical examination to draw more solid conclusions. Accordingly, it turned out that all methods can separate VFAs from the model solution. The highest average retention was achieved by RO (84% at the applied transmembrane pressure of 6 bar), while NF provided the highest permeance (6.5 L/m2hbar) and a high selectivity between different VFAs.

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Section: Resultsmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Separation of Volatile Fatty Acids from Model Anaerobic Effluents Using Various Membrane Technologies

et al. 2020

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“…With the same scope, other research groups have proposed influent concentration. Although evaporation has been suggested [ 157 ], other less energy intensive methods such as forward osmosis membranes could more likely be applied [ 158 , 159 ]. A very interesting approach was recently published where forward osmosis Aquaporin ® membranes, mimicking biological protein channels, were suggested to concentrate fermentation effluents from glycerol and wheat straw [ 160 ].…”

Section: Pha Production By Mixed Microbial Consortia (Mmc)mentioning

confidence: 99%

Recent Advances and Challenges towards Sustainable Polyhydroxyalkanoate (PHA) Production

et al. 2017

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Sustainable biofuels, biomaterials, and fine chemicals production is a critical matter that research teams around the globe are focusing on nowadays. Polyhydroxyalkanoates represent one of the biomaterials of the future due to their physicochemical properties, biodegradability, and biocompatibility. Designing efficient and economic bioprocesses, combined with the respective social and environmental benefits, has brought together scientists from different backgrounds highlighting the multidisciplinary character of such a venture. In the current review, challenges and opportunities regarding polyhydroxyalkanoate production are presented and discussed, covering key steps of their overall production process by applying pure and mixed culture biotechnology, from raw bioprocess development to downstream processing.

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“…FO concentration of VFA produced in a hydrolytic anaerobic reactor was studied to optimize the downstream microbial desalination cell (MDC) [ 82 ]. VFA rejection by the FO membrane was highly pH dependent [ 110 ]; at pH = 7.5 rejection rates above 80% are achievable and therefore the concentration of VFA by the FO process proved to be realistic and a 5-fold concentration from 60–80 up to 300–400 mg·L −1 was reached.…”

Section: Applications Of Fo As Concentrating Processmentioning

confidence: 99%

“…Pectins and humic acids feature very high molecular weight; tannins and polyphenols are smaller molecules (500–4000 Da) but are still well above the cut-off of FO membranes. However, imperfect rejection by the FO membranes of small organics, such as VFA, alcohols, pharmaceuticals and ions (cations especially, ammonium and nitrate more specifically) has been reported [ 25 , 110 , 220 , 221 ]. Overall, if the predominance of steric rejection is assumed for large molecules, other mechanisms may become preponderant for small ones, typically for molecular weight below 400 Da.…”

Section: Tuning Fo Process To Tackle Current Limitations For Optimmentioning

confidence: 99%

Forward Osmosis as Concentration Process: Review of Opportunities and Challenges

et al. 2020

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In the past few years, osmotic membrane systems, such as forward osmosis (FO), have gained popularity as “soft” concentration processes. FO has unique properties by combining high rejection rate and low fouling propensity and can be operated without significant pressure or temperature gradient, and therefore can be considered as a potential candidate for a broad range of concentration applications where current technologies still suffer from critical limitations. This review extensively compiles and critically assesses recent considerations of FO as a concentration process for applications, including food and beverages, organics value added compounds, water reuse and nutrients recovery, treatment of waste streams and brine management. Specific requirements for the concentration process regarding the evaluation of concentration factor, modules and design and process operation, draw selection and fouling aspects are also described. Encouraging potential is demonstrated to concentrate streams more than 20-fold with high rejection rate of most compounds and preservation of added value products. For applications dealing with highly concentrated or complex streams, FO still features lower propensity to fouling compared to other membranes technologies along with good versatility and robustness. However, further assessments on lab and pilot scales are expected to better define the achievable concentration factor, rejection and effective concentration of valuable compounds and to clearly demonstrate process limitations (such as fouling or clogging) when reaching high concentration rate. Another important consideration is the draw solution selection and its recovery that should be in line with application needs (i.e., food compatible draw for food and beverage applications, high osmotic pressure for brine management, etc.) and be economically competitive.

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Permeation characteristics of volatile fatty acids solution by forward osmosis

Cited by 24 publications

References 43 publications

Separation of Volatile Fatty Acids from Model Anaerobic Effluents Using Various Membrane Technologies

Separation of Volatile Fatty Acids from Model Anaerobic Effluents Using Various Membrane Technologies

Recent Advances and Challenges towards Sustainable Polyhydroxyalkanoate (PHA) Production

Forward Osmosis as Concentration Process: Review of Opportunities and Challenges

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