Permeability recovery of fouled forward osmosis membranes by chemical cleaning during a long-term operation of anaerobic osmotic membrane bioreactors treating low-strength wastewater

Wang, Xinhua; Hu, Taozhan; Wang, Zhiwei; Li, Xiufen; Ren, Yueping

doi:10.1016/j.watres.2017.07.011

Cited by 63 publications

(31 citation statements)

References 41 publications

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“…Strugholtz et al [24] examined cleaning efficacy of H 2 O 2 for membrane fouled by flocculated reservoir water, and no flux recovery was obtained with no pH adjustment, but the cleaning efficacy was significantly improved after adjusting solution pH to 12. Wang et al [25] reported that H 2 O 2 cleaning obtained the highest flux recovery for fouled forward osmosis membrane in anaerobic osmotic MBR, whereas chelate, surfactant, acids, and alkali cannot effectively remove foulants on the membrane. However, Kuzmenko et al [26] found that H 2 O 2 cleaning (pH and concentration not given) even reduced membrane flux further (the specific flux decreased from 0.60 to 0.52), whereas NaClO cleaning achieved significant flux recovery.…”

Section: Introductionmentioning

confidence: 99%

Chemical Cleaning of Ultrafiltration Membrane Fouled by Humic Substances: Comparison between Hydrogen Peroxide and Sodium Hypochlorite

Dong

et al. 2019

IJERPH

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Chemical cleaning is indispensable for the sustainable operation of ultrafiltration (UF) system in water and wastewater treatment. Sodium hypochlorite (NaClO) is an established cleaning agent for membranes subject to organic and microbial fouling, but concerns have been raised about the generation of toxic halogenated by-products during NaClO cleaning. Hydrogen peroxide (H2O2) is a potential “green” cleaning agent that can avoid the formation of halogenated by-products. In this work, cleaning efficacy of H2O2 and NaClO for UF membrane fouled by humic substances (HS) was evaluated under a wide pH range, and change of HS’s properties due to reaction with cleaning agents was examined. The cleaning efficacy of H2O2 was lower than that of NaClO at pH 3–9, but it increased to a level (91.4%) comparable with that of NaClO at pH 11. The extents of changes in properties and fouling potential of HS due to reacting with cleaning agents were consistent with their cleaning efficacy. H2O2 treatment at pH 11 significantly increased negative charge of HS molecules, decomposed high-MW molecules, and reduced its fouling potential. Therefore, considering treatment/disposal of cleaning waste and cleaning efficacy, H2O2 cleaning under strong alkaline condition can be a good choice for HS-fouled membrane.

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Section: Introductionmentioning

confidence: 99%

Chemical Cleaning of Ultrafiltration Membrane Fouled by Humic Substances: Comparison between Hydrogen Peroxide and Sodium Hypochlorite

Dong

et al. 2019

IJERPH

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“…Recent studies have investigated FO-anaerobic integration in terms of draw solution selection (Kim et al, 2016), process configurations (Qiu et al, 2016;Wang et al, 2017b;Zhang et al, 2017), membrane cleaning (Wang et al, 2017a), trace organic contaminant removal , microbial composition (Wu et al, 2017), and energy dynamics (Onoda et al, 2017). However, there is a lack of studies which thoroughly assess the key FO operating parameters that essentially govern anaerobic digestion performance.…”

Section: Introductionmentioning

confidence: 99%

Assessing the integration of forward osmosis and anaerobic digestion for simultaneous wastewater treatment and resource recovery

Ansari

Hai

Price

et al. 2018

Bioresource Technology

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This study assessed the performance and key challenges associated with the integration of forward osmosis (FO) and anaerobic digestion for wastewater treatment and resource recovery. Using a thin film composite polyamide FO membrane, maximising the pre-concentration factor (i.e. system water recovery) resulted in the enrichment of organics and salinity in wastewater. Biomethane potential evaluation indicated that methane production increased correspondingly with the FO pre-concentration factor due to the organic retention in the feed solution. At 90% water recovery, about 10% more methane was produced when using NaOAc compared with NaCl because of the contribution of biodegradable reverse NaOAc flux. No negative impact on anaerobic digestion was observed when wastewater was pre-concentrated ten-fold (90% water recovery) for both draw solutes. Interestingly, the unit cost of methane production using NaOAc was slightly lower than NaCl due to the lower reverse solute flux of NaOAc, although NaCl is a much cheaper chemical.

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“…In addition, the surface charge was analyzed by a SurPASS solid surface zeta potential analyzer (Anton Paar Co., Ltd., Glaz, Austria). The specific procedures for the SEM, EDX, contact angle analyzer, AFM and zeta potential analyzer can be found in previous literature [27,28]. The transport properties of the TFC-FO membranes were determined using a bench-scale FO system (8.5 cm × 3.9 cm) with DI water as the feed solution and 1 M NaCl as the draw solution [29,30].…”

Section: Methodsmentioning

confidence: 99%

“…The transport properties of the TFC-FO membranes were determined using a bench-scale FO system (8.5 cm × 3.9 cm) with DI water as the feed solution and 1 M NaCl as the draw solution [29,30]. The pure water permeability flux and the salt permeability coefficient were measured according to the method described in previous literature [28,31].…”

Section: Methodsmentioning

confidence: 99%

Performance Improvement and Biofouling Mitigation in Osmotic Microbial Fuel Cells via In Situ Formation of Silver Nanoparticles on Forward Osmosis Membrane

Jia²,

Miao

et al. 2020

Membranes

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An osmotic microbial fuel cell (OsMFC) using a forward osmosis (FO) membrane to replace the proton exchange membrane in a typical MFC achieves superior electricity production and better effluent water quality during municipal wastewater treatment. However, inevitable FO membrane fouling, especially biofouling, has a significantly adverse impact on water flux and thus hinders the stable operation of the OsMFC. Here, we proposed a method for biofouling mitigation of the FO membrane and further improvement in current generation of the OsMFC by applying a silver nanoparticle (AgNP) modified FO membrane. The characteristic tests revealed that the AgNP modified thin film composite (TFC) polyamide FO membrane showed advanced hydrophilicity, more negative zeta potential and better antibacterial property. The biofouling of the FO membrane in OsMFC was effectively alleviated by using the AgNP modified membrane. This phenomenon could be attributed to the changes of TFC–FO membrane properties and the antibacterial property of AgNPs on the membrane surface. An increased hydrophilicity and a more negative zeta potential of the modified membrane enhanced the repulsion between foulants and membrane surface. In addition, AgNPs directly disturbed the functions of microorganisms deposited on the membrane surface. Owing to the biofouling mitigation of the AgNP modified membrane, the water flux and electricity generation of OsMFC were correspondingly improved.

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Permeability recovery of fouled forward osmosis membranes by chemical cleaning during a long-term operation of anaerobic osmotic membrane bioreactors treating low-strength wastewater

Cited by 63 publications

References 41 publications

Chemical Cleaning of Ultrafiltration Membrane Fouled by Humic Substances: Comparison between Hydrogen Peroxide and Sodium Hypochlorite

Chemical Cleaning of Ultrafiltration Membrane Fouled by Humic Substances: Comparison between Hydrogen Peroxide and Sodium Hypochlorite

Assessing the integration of forward osmosis and anaerobic digestion for simultaneous wastewater treatment and resource recovery

Performance Improvement and Biofouling Mitigation in Osmotic Microbial Fuel Cells via In Situ Formation of Silver Nanoparticles on Forward Osmosis Membrane

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