Osmotic Distillation and vacuum membrane Distillation for juice concentration: A comparison in terms of energy consumption at the permeate side

2003 ◽

Vol 3 (5-6) ◽

pp. 57-66 ◽

Cited By ~ 2

Author(s):

D. Wirth ◽

C. Cabassud

Keyword(s):

Energy Consumption ◽

Reverse Osmosis ◽

Membrane Distillation ◽

Hollow Fibre ◽

Permeate Flux ◽

Seawater Desalination ◽

Industrial Plants ◽

Low Energy Consumption ◽

In Series ◽

Vacuum Membrane Distillation

This work addresses the potentialities of vacuum membrane distillation (VMD) using hollow fibre membranes for seawater desalination. Experiments were carried out with a synthetic salty water containing a concentration of NaCl from 0 up to 300 g/L. A Microza (Pall) hollow fibre module was used. Experimental results show that, for this module, concentration polarisation and heat transfer limitations are not significant and do not modify the permeate flux. This is a great advantage over reverse osmosis (RO). Energy consumption was then studied using computations based on modelling. Two different industrial plants were considered: the first one consisted of hollow fibre modules arranged in series and operated in a single-pass. The second one was designed for a discontinuous operation using a circulation loop. Computations clearly show the interest (low energy consumption) of VMD for seawater desalination in comparison with RO.

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Membrane-Based Operations in the Fruit Juice Processing Industry: A Review

Beverages ◽

10.3390/beverages6010018 ◽

2020 ◽

Vol 6 (1) ◽

pp. 18 ◽

Cited By ~ 5

Author(s):

Carmela Conidi ◽

Roberto Castro-Muñoz ◽

Alfredo Cassano

Keyword(s):

Energy Consumption ◽

Nutritional Value ◽

Fruit Juice ◽

New Technologies ◽

Membrane Distillation ◽

Low Energy ◽

Processing Industry ◽

Osmotic Distillation ◽

Juice Processing ◽

Low Energy Consumption

The fruit juice industry is one of the food sectors that has invested the most in the implementation of new technologies, such as non-thermal technologies. Among them, membrane processes are considered today well-established separation techniques to support the production and marketing of innovative fruit juices designed to exploit the sensory characteristics and nutritional peculiarities of fresh fruits. Pressure-driven membrane operations, membrane distillation, osmotic distillation and pervaporation have been widely investigated in the last few decades to replace conventional technologies used in fruit juice processing industry (i.e., clarification, stabilization, concentration and recovery of aroma compounds). This paper will review the significant progresses on the use of membrane-based operations in fruit juice processing industry in the light of the growing interest towards products with improved safety, quality and nutritional value and sustainable processes characterized by low energy consumption and low environmental impact.

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Effect of the operating variables on the extraction and recovery of aroma compounds in an osmotic distillation process coupled to a vacuum membrane distillation system

Journal of Food Engineering ◽

10.1016/j.jfoodeng.2012.03.004 ◽

2012 ◽

Vol 111 (4) ◽

pp. 632-641 ◽

Cited By ~ 26

Author(s):

A. Hasanoğlu ◽

F. Rebolledo ◽

A. Plaza ◽

A. Torres ◽

J. Romero

Keyword(s):

Membrane Distillation ◽

Aroma Compounds ◽

Distillation Process ◽

Osmotic Distillation ◽

Operating Variables ◽

Distillation System ◽

Vacuum Membrane Distillation

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Assessing the Impact of Operating Conditions on the Energy and Exergy Efficiency for Multi-Effect Vacuum Membrane Distillation Systems

Water ◽

10.3390/w13111500 ◽

2021 ◽

Vol 13 (11) ◽

pp. 1500

Author(s):

A. Najib ◽

J. Orfi ◽

H. Alansary ◽

E. Ali

Keyword(s):

Energy Consumption ◽

Pilot Plant ◽

Membrane Distillation ◽

Exergy Efficiency ◽

Operating Conditions ◽

Performance Ratio ◽

Cold Temperatures ◽

Energy And Exergy ◽

Vacuum Membrane Distillation ◽

The Impact

A comprehensive study was conducted to elucidate the effect of operating conditions on the performance of a multi-effect vacuum membrane distillation pilot plant. A theoretical assessment of the energy and exergy efficiency of the process was achieved using a mathematical model based on heat and mass transfer, which was calibrated using experimental data obtained from the pilot plant. The pilot plant was a solar vacuum multi-effect membrane distillation (V-MEMD) module comprising five stages. It was found that a maximal permeate mass flux of 17.2 kg/m2·h, a recovery ratio of 47.6%, and a performance ratio of 5.38% may be achieved. The resulting gain output ratio (GOR) under these conditions was 5.05, which is comparable to previously reported values. Furthermore, the present work systematically evaluated not only the specific thermal energy consumption (STEC), but also the specific electrical energy consumption (SEEC), which has been generally neglected in previous studies. We show that STEC and SEEC may reach 166 kWh/m3 and 4.5 kWh/m3, respectively. We also observed that increasing the feed flow rate has a positive impact on the process performance, particularly when the feed temperature is higher than 65 °C. Under ideal operational conditions, the exergetic efficiency reached 21.1%, and the maximum fraction of exergy destruction was localized in the condenser compartment. Variation of the inlet hot and cold temperatures at a constant differential showed an interesting and variable impact on the performance indicators of the V-MEMD unit. The difference with the lowest inlet temperatures exhibited the most negative impact on the system performance.

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Enhanced Performance of Membrane Distillation Using Surface Heating Process

Membranes ◽

10.3390/membranes11110866 ◽

2021 ◽

Vol 11 (11) ◽

pp. 866

Author(s):

Fei Han ◽

Shuxun Liu ◽

Kang Wang ◽

Xiaoyuan Zhang

Keyword(s):

Energy Consumption ◽

Energy Performance ◽

High Energy ◽

Membrane Distillation ◽

Operating Conditions ◽

Surface Heating ◽

Commercial Application ◽

Heating Process ◽

Temperature Polarization ◽

Vacuum Membrane Distillation

Membrane distillation (MD) is a thermally driven desalination process that has excellent application prospects in seawater desalination or hypersaline wastewater treatment, while severe temperature polarization (TP) and the resulting relatively high energy consumption have become principal challenges limiting the commercial application of MD. Therefore, the design of novel systems to overcome the shortage of conventional MD requires urgent attention. Here, we developed three surface heating vacuum membrane distillation systems, namely, SHVMD-1, SHVMD-2, and SHVMD-3, according to the different positions of the thermal conducting layer in the cell. The distillate flux, TP, and energy performance of these systems under different operating conditions were investigated. All three systems showed stable performance, with a salt rejection >99.98% for 35 g/L NaCl, and the highest flux was close to 9 L/m2·h. The temperature polarization coefficients were higher than unity in SHVMD-2 and SHVMD-3 systems, and the SHVMD-2 system produced the lowest specific energy consumption and the highest thermal efficiency. In addition, we tested the intermittent surface heating process, which can further improve energy performance through reducing specific electrical energy consumption in vacuum membrane distillation. This paper provides a simple and efficient membrane system for the desalination of brines.

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