Demonstration of membrane distillation on textile waste water: assessment of long term performance, membrane cleaning and waste heat integration

Dow, Noel; García, Jesús Villalobos; Niadoo, Leslie; Milne, Nicholas; Zhang, Jianhua; Gray, Stephen; Duke, Mikel

doi:10.1039/c6ew00290k

Cited by 75 publications

(57 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Volatile components transporting through an intact non-wetted membrane can also contribute to permeate EC [ 10 , 11 ], so intactness of the PU-PTFE membranes is confirmed by high (>99%) rejection of the non-volatile sodium ( Table 4 and Table 5 ). The standard PTFE membrane, however, showed an increase in sodium by more than one order of magnitude of the original permeate water which is strong evidence to support the conclusion this membrane had indeed wetted.…”

Section: Resultsmentioning

confidence: 99%

“…MD is a thermally-driven phase change separation process which conveniently utilises waste thermal energy from an industry site to capture clean distillate as well as concentrate wastes, including dissolved solids such as minerals which has driven the focus to desalination [ 5 ]. Further, application of MD has been shown in various industry contexts including a treatment of wastewaters at a power station [ 10 ], textile plant [ 11 ], food processing facility [ 12 ], and metal forming industry [ 13 ], as well as dairy product concentration [ 14 ]. More details of MD applications can be found in recent reviews [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Membrane Distillation of Meat Industry Effluent with Hydrophilic Polyurethane Coated Polytetrafluoroethylene Membranes

et al. 2017

Self Cite

View full text Add to dashboard Cite

Meat rendering operations produce stick water waste which is rich in proteins, fats, and minerals. Membrane distillation (MD) may further recover water and valuable solids, but hydrophobic membranes are contaminated by the fats. Here, commercial hydrophobic polytetrafluorethylene (PTFE) membranes with a hydrophilic polyurethane surface layer (PU-PTFE) are used for the first time for direct contact MD (DCMD) on real poultry, fish, and bovine stick waters. Metal membrane microfiltration (MMF) was also used to capture fats prior to MD. Although the standard hydrophobic PTFE membranes failed rapidly, PU-PTFE membranes effectively processed all stick water samples to colourless permeate with sodium rejections >99%. Initial clean solution fluxes 5–6 L/m2/h declined to less than half during short 40% water recovery tests for all stick water samples. Fish stick water uniquely showed reduced fouling and up to 78% water recovery. Lost flux was easily restored by rinsing the membrane with clean water. MMF prior to MD removed 92% of fats, facilitating superior MD performance. Differences in fouling between stick waters were attributed to temperature polarisation from higher melt temperature fats and relative proportions to proteins. Hydrophilic coated MD membranes are applicable to stick water processing but further studies should consider membrane cleaning and longer-term stability.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Membrane Distillation of Meat Industry Effluent with Hydrophilic Polyurethane Coated Polytetrafluoroethylene Membranes

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…Figure 7 shows the appearance of the membrane after the run. The darker regions are indicative of wetting, as they are actually transparent, known to indicate where the membrane is wetted [ 19 ]. Therefore, MD is likely to require pre-treatment or inline removal of accumulated solids to maintain performance and produce high-quality water.…”

Section: Resultsmentioning

confidence: 99%

“…The use of pretreatments, such as flocculants or foam fractionators (used to remove organic and inorganic compounds via a rising stream of fine air bubbles), are recommended for further studies, as it might be a good improvement to reduce the level of surfactants in the feed wastewater before it is introduced to the MD plant. In a recent trial paper [ 19 ], the use of fractionation was demonstrated at bench scale to minimize surfactant wetting. The combination of processes, such as a membrane bioreactor (MBR) or nanofiltration/ultrafiltration (NF/UF), with MD is likely an option [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

“…The second aimed to recover water from ion-exchange regeneration waste produced at a power station, where the MD was powered by low-grade waste heat [ 18 ]. This paper presents the outcome of a pilot trial of MD for processing textile wastewaters, which was carried out before a three-month trial that was fed with wastewater from the existing biological treatment process [ 19 ]. However, direct treatment of the site’s effluent to avoid biological treatment aligns with the future vision of more intensified water treatment of textile facilities [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Membrane Distillation Trial on Textile Wastewater Containing Surfactants Using Hydrophobic and Hydrophilic-Coated Polytetrafluoroethylene (PTFE) Membranes

et al. 2018

Self Cite

View full text Add to dashboard Cite

Treating wastewater from textile plants using membrane distillation (MD) has great potential due to the high-salinity wastes and availability of waste heat. However, textile wastewaters also contain surfactants, which compromise the essential hydrophobic feature of the membrane, causing membrane wetting. To address this wetting issue, a custom-made membrane consisting of a hydrophilic layer coated on hydrophobic polytetrafluoroethylene (PTFE) was tested on textile wastewater in a pilot MD setup, and compared with a conventional hydrophobic PTFE membrane. The test was carried out with a feed temperature of 60 °C, and a permeate temperature of 45 °C. The overall salt rejection of both membranes was very high, at 99%. However, the hydrophobic membrane showed rising permeate electrical conductivity, which was attributed to wetting of the membrane. Meanwhile, the hydrophilic-coated membrane showed continually declining electrical conductivity demonstrating an intact membrane that resisted wetting from the surfactants. Despite this positive result, the coated membrane did not survive a simple sodium hydroxide clean, which would be typically applied to a membrane process. This brief study showed the viability of membrane distillation membranes on real textile wastewaters containing surfactants using hydrophilic-coated hydrophobic PTFE, but the cleaning process required for membranes needs optimization.

show abstract

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

View full text Add to dashboard Cite

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)

show abstract

Demonstration of membrane distillation on textile waste water: assessment of long term performance, membrane cleaning and waste heat integration

Abstract: A three month membrane distillation trial demonstrated innovative pretreatments, cleaning and waste heat integration as an inland textile industry wastewater solution.

Cited by 75 publications

References 50 publications

Membrane Distillation of Meat Industry Effluent with Hydrophilic Polyurethane Coated Polytetrafluoroethylene Membranes

Membrane Distillation of Meat Industry Effluent with Hydrophilic Polyurethane Coated Polytetrafluoroethylene Membranes

Membrane Distillation Trial on Textile Wastewater Containing Surfactants Using Hydrophobic and Hydrophilic-Coated Polytetrafluoroethylene (PTFE) Membranes

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

Contact Info

Product

Resources

About