Dye synthetic solution treatment by direct contact membrane distillation using commercial membranes

Ramlow, Heloisa; Machado, Ricardo Antônio Francisco; Bierhalz, Andréa Cristiane Krause; Marangoni, Cintia

doi:10.1080/09593330.2018.1561758

Cited by 21 publications

(16 citation statements)

References 38 publications

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“…Further analysis of the bottom layer shows that the water contact angle reduces once the DCPI method was applied. The high hydrophobicity enhances the high resistance towards water molecule to enter the membrane pores, instead of allowing only water vapour to pass through 25 . Comparing with the SL membrane, the water contact angle of the bottom layer of the fabricated DL membrane was 5% lower due to the reduction in surface roughness as the absence of NPs on the bottom layer.…”

Section: Resultsmentioning

confidence: 97%

“…This might be due to the non‐uniform pore distribution that may lead to fouling activities. According to Ramlow et al, the thermal conductivity of the air inside the pores is smaller than the polymer matrix; thus, it favours higher permeates flux and less heat loss throughout the process 25 . As a result, the interplay between characteristics of the membrane such as the surface hydrophobicity, selective layer thickness, porosity and appropriate pore size mainly caused the obtained flux 13,22,25 .…”

Section: Resultsmentioning

confidence: 99%

“…According to Ramlow et al, the thermal conductivity of the air inside the pores is smaller than the polymer matrix; thus, it favours higher permeates flux and less heat loss throughout the process 25 . As a result, the interplay between characteristics of the membrane such as the surface hydrophobicity, selective layer thickness, porosity and appropriate pore size mainly caused the obtained flux 13,22,25 . Therefore, by referring to the membrane characterisations and performance, membrane D1 is more preferable according to its ability to maintain its stability along with the 6‐h DCMD operation.…”

Section: Resultsmentioning

confidence: 99%

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Effect of ZnO nanoparticles loading in double‐layer polyvinylidene fluoride membrane for desalination via direct contact membrane distillation

Radzi

Ahmad

2020

Asia-Pacific J Chem Eng

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In this study, double‐layer flat sheet membranes consist of nanocomposite polyvinylidene fluoride (PVDF)–ZnO layer on the top, whereas pristine polymeric PVDF on the bottom was fabricated via the double‐casting phase inversion (DCPI) method. The nanocomposite layer was prepared by loading 0.5%, 1.0%, 1.5% and 2.0% of ZnO nanoparticles. The morphology of the membranes changed as ZnO nanoparticles were introduced in the top layer, where the structure is more rigid and porous than the bottom layer. The increment concentration of nanoparticles in the top layer of the double‐layer membrane gives an effect in increasing of water contact angle slightly, which is from 136° to 140°. Furthermore, the liquid entry pressure of water (LEPw) decreases gradually from 0.69 to 0.4 bar with a high concentration of ZnO due to the presence of large pores. The increment concentration of ZnO nanoparticles also resulted in high porosity and reduced pore size, which reduce the resistance of water vapour to pass through the pores as well as enhancing the performance of membrane distillation (MD). Direct contact membrane distillation (DCMD) experiments were carried out to evaluate the efficiency of the fabricated double‐layer membrane in the desalination of seawater from fish farm water for 6‐h operation. The optimal double‐layer membrane with 0.5% ZnO nanoparticles loading maintained a stable flux of 9.42 L/m2h with 99.9% salt rejection and has antifouling properties. The results indicated that the fabricated double‐layer membrane via the DCPI method fulfils the required properties for MD application with excellent salt rejection.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effect of ZnO nanoparticles loading in double‐layer polyvinylidene fluoride membrane for desalination via direct contact membrane distillation

Radzi

Ahmad

2020

Asia-Pacific J Chem Eng

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“…On the other hand, disperse dyes are small, planar and non‐ionic, with polar functional groups. In water, they originate dispersions, which require high pressure and temperature for the dyeing process 18 . The ionic character of the dyes directly affects the vapor flux across the membrane, due to the physical interactions among the dyes and the membrane surface.…”

Section: Resultsmentioning

confidence: 99%

“…reported the positive outcomes of a pilot‐scale unit and practical assessment of DCMD towards achieving zero liquid discharge at a textile manufacturing plant, reaching 91.6% of water recovery at the end of the trial. Ramlow et al 18 . evaluated the potentialities of commercial flat sheet membranes of polytetrafluoroethylene (PTFE) and polypropylene in DCMD for synthetic dye solution treatment, obtaining high permeate flux up to 18.8 kg m −2 h −2 , and with complete color rejection.…”

Section: Introductionmentioning

confidence: 99%

Modeling and experimental validation of direct contact membrane distillation applied to synthetic dye solutions

Madalosso

Silva

Merlini

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND In order to protect water resources and reduce the harmful effects of releasing contaminated wastewater to the environment, the textile industry has increasingly demanded improved water reclamation technologies, such as membrane distillation. In this work, theoretical and experimental investigations were carried out to evaluate the behavior of the operational parameters of a direct contact membrane distillation (DCMD) setting with a commercial membrane applied to synthetic dye solutions, simulating textile wastewater from the fabric dyeing stage. RESULTS The analytical model based on heat and mass transfer correlations specific to textile effluents implemented using Matlab® predicted the permeate flux with good agreement, with errors less than 10% when compared with the experimental values. There was a different trend for reactive and disperse dyes when input variables were changed. In general, increasing all variables led to an increase in permeate flux. An increase of 30 °C in the feed temperature increased by 2.0‐ to 2.3‐fold the permeate flux. Moreover, the simulation showed the influence of the permeate temperature and the membrane interface temperature on the permeate flux, which is not commonly achieved experimentally. CONCLUSIONS The hybrid modeling supported by extensive experimental validation accurately predicted the permeate flux in DCMD to recover water from synthetic dye solutions containing reactive and disperse black dyes. DCMD is a promising technology for recovering textile wastewater containing these dyes, as it can use the waste heat from the hot effluent discharge. Therefore, this work can contribute towards the scaling up of DCMD, aiding in predicting and optimizing the operational variables. © 2020 Society of Chemical Industry (SCI)

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Treatment of dye wastewater by direct contact membrane distillation using superhydrophobic nanofibrous high-impact polystyrene membranes

Khoshnevisan

Bazgir

2020

Int. J. Environ. Sci. Technol.

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Dye synthetic solution treatment by direct contact membrane distillation using commercial membranes

Cited by 21 publications

References 38 publications

Effect of ZnO nanoparticles loading in double‐layer polyvinylidene fluoride membrane for desalination via direct contact membrane distillation

Effect of ZnO nanoparticles loading in double‐layer polyvinylidene fluoride membrane for desalination via direct contact membrane distillation

Modeling and experimental validation of direct contact membrane distillation applied to synthetic dye solutions

Treatment of dye wastewater by direct contact membrane distillation using superhydrophobic nanofibrous high-impact polystyrene membranes

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