Gypsum scaling and membrane integrity of osmotically driven membranes: The effect of membrane materials and operating conditions

Wang, Yining; Järvelä, Eliisa; Wei, Jing; Zhang, Minmin; Kyllönen, Hanna; Wang, Rong; Tang, Chuyang Y.

doi:10.1016/j.desal.2015.08.024

Cited by 60 publications

(31 citation statements)

References 44 publications

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“…NaCl permeability of 7.40×10 −8 m/s, and a structure parameter of 0.70 mm. (Coday et al, 2015;Wang et al, 2016) Membrane coupons were soaked in MilliQ water (18.2 MΩ.cm) at room temperature for over 24 h before use. (She et al, 2013a;Zhang et al, 2014) Glucose-based defined medium was used as the synthetic feed wastewater, so degradation and mass transfer mechanisms can be understood.…”

Section: Membranes and Chemicalsmentioning

confidence: 99%

Microbial fuel cells and osmotic membrane bioreactors have mutual benefits for wastewater treatment and energy production

Hou

Ren

2016

Water Research

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This study demonstrates that microbial fuel cells (MFCs) and osmotic membrane bioreactors (OMBRs) can be mutually beneficial when integrated together for wastewater treatment. When connecting MFCs with OMBRs, the solute buildup increased conductivity and buffer capacity, which greatly increased MFC power density from 3 W/m(3) up to 11.5 W/m(3). In turn, the MFCs conditioned and reduced sludge production and therefore reduced forward osmosis (FO) membrane fouling. The MFC-OMBR equipped with new thin-film composite (TFC) membrane showed excellent organic (>95%) and phosphorus removal (>99%) and therefore maintained effluent sCOD below 20 mg/L. However, the nitrogen removal was limited due to the negative surface charge of the thin-film composite membrane and solution chemistry, which led to higher flux of ammonium toward the OMBR draw solution. Further studies are needed to improve nitrogen removal, reduce fouling, and optimize system integration.

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Section: Membranes and Chemicalsmentioning

confidence: 99%

Microbial fuel cells and osmotic membrane bioreactors have mutual benefits for wastewater treatment and energy production

Hou

Ren

2016

Water Research

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“…[20][21][22][23][24] According to previous studies, inorganic salts especially NaCl and MgCl 2 were the most commonly used draw solutes in OMBR studies. 4,5,25,26 Thus, the objective of this study is to evaluate the performance of TFC-FO membrane in the AnMF-OMBR with the draw solutes of NaCl and MgCl 2 .…”

Section: Introductionmentioning

confidence: 99%

Impacts of inorganic draw solutes on the performance of thin-film composite forward osmosis membrane in a microfiltration assisted anaerobic osmotic membrane bioreactor

Wang

et al. 2017

RSC Adv.

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The influences of inorganic draw solutes on the performance of the thin-film composite forward osmosis (TFC-FO) membrane in microfiltration (MF) assisted anaerobic osmotic membrane bioreactors (AnMFOMBRs) were investigated in this study. The results indicated that compared to sodium chloride (NaCl) at the same osmotic pressure, magnesium chloride (MgCl 2 ) led to a higher flux decline of the TFC-FO membrane, induced by more severe membrane fouling. In addition, the NaCl and MgCl 2 had no impacts on the rejection for organic matters by the TFC-FO membrane. However, the NH 4 + -N rejection of TFC-FO membrane was neglected in the AnMF-OMBR with NaCl as draw solute, while it was enhanced to a range of 57.5-87.6% for the draw solute MgCl 2 . The different NH 4 + -N rejection and membrane fouling of TFC-FO membrane with draw solutes NaCl and MgCl 2 could be attributed to the Donnan potential. As for NaCl, more Na + diffused into the mixed liquor resulting in NH 4 + -N passing through the TFC-FO membrane to the draw solution for keeping a charge balance. With regard to MgCl 2 , more Cl À passing through the FO membrane to the mixed liquor led to an accumulation of NH 4 + -N in the reactor. Moreover, Mg 2+ passing from the draw solution to the mixed liquor enhanced the biofouling on the active layer of the FO membrane, and in the meanwhile more anions passing to the draw solution aggravated the inorganic fouling of the support layer.

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“…A sufficient shear force (i.e., physical flushing) can be used for the removal of reversible fouling but this is not the case with irreversible fouling. Numerous authors have investigated the fouling reversibility of FO under various scenarios: single fouling (i.e., alginate [26] [27], colloidal silica [26] [27], gypsum scaling [14] [28] [29], combined fouling (i.e., alginate + colloidal silica [27], alginate + gypsum scaling [14]), different membrane types [28] [30], and operating condition (i.e., effect of applied hydraulic pressure [27] [31]). Their results indicated that a higher restoration of water flux is obtained with single foulants.…”

Section: Introductionmentioning

confidence: 99%

Critical flux-based membrane fouling control of forward osmosis: Behavior, sustainability, and reversibility

Nguyen

Kook

Lee

et al. 2019

Journal of Membrane Science

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Membrane fouling is closely related to the concept of critical flux. Therefore, a fouling control stategy for forward osmosis (FO) membranes that is based on the critical flux is necessary. This study systematically investigated the critical flux behavior of FO membranes (CTA and PA-TFC) in the short-term using a stepping method (draw solution (DS) concentration stepping). In addition, to test the reliability of this method, long-term experiments were conducted to evaluate the influences of operational critical flux on the fouling behavior (sustainable operation and fouling reversibility/irreversibility), thereby determining the critical flux for reversibility. Our results showed that the DS concentration stepping could be applied for critical flux determination in FO. Both membranes exhibited higher critical flux values for alginate fouling compared to other single foulants such as colloidal silica or gypsum. The values were 15.9 LMH for a cellulose triacetate membrane (CTA) and 20.5 LMH for the polyamide thin-film composite (PA-TFC). Whilst these values should be adequate in FO applications they were determined for single foulants. The presence of multispecies of foulants caused a significant decline in the critical flux values. This study found 5.4 LMH for the CTA membrane and 8.3 LMH for the PA-TFC membrane for the combined foulants of alginate + gypsum. This indicates that the critical flux behavior in FO was dependent on the foulant type and membrane type. Importantly, 98-100% restoration of water flux was achieved with the PA-TFC membrane at an operation either close to or below critical flux (i.e., in case of negligible fouling), except for the combination of alginate-combined colloidal silica. The critical fluxes for reversibility obtained in this study will aid the efficient operation of practical FO processes.

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Gypsum scaling and membrane integrity of osmotically driven membranes: The effect of membrane materials and operating conditions

Cited by 60 publications

References 44 publications

Microbial fuel cells and osmotic membrane bioreactors have mutual benefits for wastewater treatment and energy production

Microbial fuel cells and osmotic membrane bioreactors have mutual benefits for wastewater treatment and energy production

Impacts of inorganic draw solutes on the performance of thin-film composite forward osmosis membrane in a microfiltration assisted anaerobic osmotic membrane bioreactor

Critical flux-based membrane fouling control of forward osmosis: Behavior, sustainability, and reversibility

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