Designing and optimization of continuous direct contact membrane distillation process

Ali, Aamer; Tsai, Jheng-Han; Tung, Kuo‐Lun; Drioli, Enrico; Macedonio, Francesca

doi:10.1016/j.desal.2017.10.041

Cited by 67 publications

(14 citation statements)

References 36 publications

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“…The maximum flux was observed at the highest flow rate. It is well acknowledged that a high feed velocity decreases the temperature polarization and temperature drop along the module in MD [23,24], which results in a higher flux, as is also observed for the studies on pure water flux. However, there was no significant difference in the flux measured at feed flow rates of 14.8 L/h and 21.6 L/h.…”

Section: Md/mcr Tests With the Wastewatermentioning

confidence: 59%

Treatment of Wastewater Solutions from Anodizing Industry by Membrane Distillation and Membrane Crystallization

et al. 2019

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The treatment of wastewater containing various metal ions is a challenging issue in the anodizing industry. The current study investigates the application of membrane distillation/crystallization (MD/MCr) for the simultaneous recovery of freshwater and sodium sulfate from wastewater originating from a Danish anodizing industry. MD/MCr experiments were performed on supernatant from wastewater obtained after centrifugation. The effect of various feed temperatures and cross-flow velocities on flux and crystal characteristics was investigated. The crystal growth in the feed tank was monitored through the use of an online PaticleView microscope. The crystals’ morphology and form were determined by using scanning electron microscope (SEM) and X-ray powder diffraction (XRD), respectively, while inductively coupled plasma (ICP) was applied to determine the purity of the obtained crystals. The weight and dimensions of the MD/MCr unit that were required to treat the specific amount of wastewater were evaluated as a function of the feed inlet temperature. It was demonstrated that the application of MCr allows extracting high-purity sodium sulfate crystals and more than 80% freshwater from the wastewater.

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Section: Md/mcr Tests With the Wastewatermentioning

confidence: 59%

Treatment of Wastewater Solutions from Anodizing Industry by Membrane Distillation and Membrane Crystallization

et al. 2019

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“…Under these conditions, the contribution of liquid heat transfer coefficient in controlling the trans-membrane flux is significant. Increase in V f increases the heat transfer coefficient at feed side and decreases the temperature drop along the module and thus the average flux will go up (Ali et al 2016(Ali et al , 2018a. Flux for PE2 membrane at V f of 0.04 m/s is shown with diamond symbols in Figure 2(b) and is slightly (maximum 16%) lower than PE1 membranes under all the temperature conditions considered, possibly because of its lower porosity ( Table 2).…”

Section: Resultsmentioning

confidence: 99%

Direct contact membrane distillation for the treatment of wastewater for a cooling tower in the power industry

et al. 2018

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Water abstraction for cooling requirements in energy production accounts for more than 40% of the total gross abstraction in the European Union, thus driving the interest in using alternative water resources. The current study presents the application of direct contact membrane distillation for the treatment of wastewater from a flue gas desulphurization (FGD) plant for potential applications in cooling towers. Membrane distillation (MD) performance of two commercial lab-scale membrane modules (in capillary and flat configuration) was compared in terms of flux, specific energy consumption (SEC), and rejection towards non-volatiles present in wastewater samples, pretreated according to various protocols. For the flat module, two commercial membranes were tested. In all cases, a good quality permeate was produced, with stable flux over experimental time. SEC of MD for wastewater treatment, calculated experimentally, varied from 946 to 2,830 kWh/m3 for the various applied membranes operating under different conditions. MD allows extracting more than 80% freshwater from FGD wastewater stream while maintaining high (>99.60%) rejection towards electrical conductivity.

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“…An increase in the permeate recirculation velocity could prevent temperature drop in MD permeate while it was flowed through fiber lumen. Thus, vapor pressure difference can be maintained so that it can result in stable permeate flux [31,32]. As the permeate recirculation velocity increases, the Reynolds number (Re) also increases along the hollow-fiber membrane.…”

Section: Of 12mentioning

confidence: 99%

Permeate Flux and Rejection Behavior in Submerged Direct Contact Membrane Distillation Process Treating a Low-Strength Synthetic Wastewater

Bae

Kim

2020

Applied Sciences

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The effects of operational conditions such as permeate recirculation velocity, mixing intensity, and trans-membrane temperature on the performances of hydrophobic polyethylene (PE) hollow-fiber membrane were investigated by operating the submerged direct contact membrane distillation (SDCMD) process treating a synthetic low-strength wastewater. Permeate flux of the membrane increased with increasing a permeate recirculation velocity through the fiber lumen. However, the effectiveness was less pronounced as the velocity was higher than 0.5 m/s. Increasing rotational speed to 600 rpm, which can lead to mixing intensity from a bulk wastewater toward hollow-fiber membrane, enhanced permeate flux. Feed temperature played a more significant role in enhancing permeate flux rather than a permeate temperature under constant trans-membrane temperature. The SDCMD process treating a synthetic low-strength wastewater achieved an excellent rejection efficiency which is higher than 97.8% for both chemical oxygen demand (CODCr) and total phosphorus (T-P) due to the hydrophobic property of membrane material which can allow water vapor through membrane. However, the rejection efficiency of the ammonia nitrogen (NH3-N) was relatively low at about 87.5% because ammonia gas could be volatized easily through membrane pores in SDCMD operation. In a long-term operation of the SDCMD process, the permeate flux decreased significantly due to progressive formation of inorganic scaling on membrane.

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Designing and optimization of continuous direct contact membrane distillation process

Cited by 67 publications

References 36 publications

Treatment of Wastewater Solutions from Anodizing Industry by Membrane Distillation and Membrane Crystallization

Treatment of Wastewater Solutions from Anodizing Industry by Membrane Distillation and Membrane Crystallization

Direct contact membrane distillation for the treatment of wastewater for a cooling tower in the power industry

Permeate Flux and Rejection Behavior in Submerged Direct Contact Membrane Distillation Process Treating a Low-Strength Synthetic Wastewater

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