scholarly journals Frontiers of Nanofiltration, Ultrafiltration and the Future of Global Water Shortage - A Deep and Visionary Comprehension

2014 ◽  
Vol 38 ◽  
pp. 120-131 ◽  
Author(s):  
Sukanchan Palit
Keyword(s):  
Membrane Separation ◽  
Water Shortage ◽  
Environmental Engineering ◽  
Engineering Science ◽  
Separation Processes ◽  
Separation Science ◽  
Scientific World ◽  
Zero Discharge ◽  
Similar Vein ◽  
Global Water

The world of environmental engineering science is moving briskly and steadfastly in a newer vision and a newer age ahead in the civilisation’s progress. Global water shortage has become a primordial issue in present day human civilization. Environmental regulations and ecological restrictions has to be reassessed and rejudged at this critical juncture of history and time. In a similar vein the importance of membrane science and the applicability of environmental engineering techniques stands in the midst of immense optimism and scientific vision. Analytically, membrane separation science will bring environmental engineering science to the newer vision of zero discharge norms. Zero discharge norms and environmental engineering paradigm has an umbilical cord which has a decisive effect on ecological balance. The primordial and the decisive factor in global water shortage is the issue of ground water contamination and its subsequent remediation. Nanofiltration, ultrafiltration and other membrane separation processes in today’s scientific world and scientific vision stands in the midst of inimitable hope and optimism

scholarly journals Future Vision of Advanced Oxidation Process and its Immediate Efficacy - A Deep, Insightful Comprehension and a Far-Reaching Review

2014 ◽  
Vol 33 ◽  
pp. 136-145 ◽  
Author(s):  
Sukanchan Palit
Keyword(s):  
Advanced Oxidation Processes ◽  
Advanced Oxidation Process ◽  
Advanced Oxidation ◽  
Environmental Engineering ◽  
Environmental Disaster ◽  
Separation Processes ◽  
Oxidation Processes ◽  
The Face ◽  
Zero Discharge ◽  
Future Vision

Environmental engineering is moving briskly and steadily from one challenging phase to another. The world of challenges are immense as well as far-reaching. Advanced oxidation processes today stands in the midst of immense scientific vision, scientific understanding and invincible scientific challenges. The effectivity of degradation quality of ozone and hydroxyl radicals is outstanding and path-breaking. Environmental concerns and subsequent environmental regulations are the burning issues of our present day civilization. Novel separation processes as well advanced oxidation techniques are the plausible solutions for zero-discharge norms and effective environmental engineering paradigm. The question of effective environmental engineering techniques comes into the horizon of a scientist’s mind. Amongst the advanced oxidation techniques, ozonation or ozone-oxidation stands today in the new millennium as the most effective environmental engineering techniques. Wastewater treatment and provision of clean drinking water are unquestionably the primordial issues of present day mankind and the ever-alert civil society. The visionary challenges are moving from one avenue of environmental disaster to another. Environmental disaster – both manmade as well as natural has plunged our civilization to unending catastrophe. These environmental calamities are harbingers of more immense and impending environmental disasters. The scientific paradigm and the scientific domain needs rethought and needs to be restructured. In the face of these immense environmental calamities, the thrust areas of novel separation processes and advanced oxidation needs immense retrospection. In such a critical juncture of history and time, this treatise effectively addresses the questions of zero-discharge norms with respect to new discoveries in the field of advanced oxidation processes particularly the field of ozonation.

Liquid Membranes in Catalysis

2021 ◽  
Vol 08 ◽  
Author(s):  
Muhammad Waqar Ashraf ◽  
M.Amin Mir
Keyword(s):  
Membrane Separation ◽  
Membrane Reactors ◽  
Complex Mixtures ◽  
Liquid Membranes ◽  
Chemical Transformations ◽  
Active Materials ◽  
Separation Processes ◽  
Separation Science ◽  
Supported Ionic Liquid ◽  
Catalytically Active

: The supported ionic liquid (SIL) membranes have demonstrated huge potential for numerous applications in current separation science and catalysis. Membrane technology allows for separation of complex mixtures of gases, vapours, liquids and /or solids below trivial conditions. Simultaneous chemical transformations can also be achieved in membranes by using catalytically active materials comprising the membrane or embedded catalysts in the custom built membrane reactors. In the present editorial, the remarkable contribution of liquid membranes in catalysis is highlighted. Some recent applications are presented and compared with conventional methods. In addition, SILs and their applications in catalysis, catalytic membranes and recent advances in membrane separation processes are briefly described.

Separation of Biologically Active Compounds by Membrane Operations

2017 ◽  
Vol 23 (2) ◽  
pp. 218-230 ◽  
Author(s):  
Xiaoying Zhu ◽  
Renbi Bai
Keyword(s):  
Energy Consumption ◽  
Bioactive Compounds ◽  
Membrane Fouling ◽  
Membrane Separation ◽  
Separation Efficiency ◽  
High Energy ◽  
Separation Processes ◽  
Membrane Processes ◽  
Separation Technology ◽  
Pressure Driven

Background: Bioactive compounds from various natural sources have been attracting more and more attention, owing to their broad diversity of functionalities and availabilities. However, many of the bioactive compounds often exist at an extremely low concentration in a mixture so that massive harvesting is needed to obtain sufficient amounts for their practical usage. Thus, effective fractionation or separation technologies are essential for the screening and production of the bioactive compound products. The applicatons of conventional processes such as extraction, distillation and lyophilisation, etc. may be tedious, have high energy consumption or cause denature or degradation of the bioactive compounds. Membrane separation processes operate at ambient temperature, without the need for heating and therefore with less energy consumption. The “cold” separation technology also prevents the possible degradation of the bioactive compounds. The separation process is mainly physical and both fractions (permeate and retentate) of the membrane processes may be recovered. Thus, using membrane separation technology is a promising approach to concentrate and separate bioactive compounds. Methods: A comprehensive survey of membrane operations used for the separation of bioactive compounds is conducted. The available and established membrane separation processes are introduced and reviewed. Results: The most frequently used membrane processes are the pressure driven ones, including microfiltration (MF), ultrafiltration (UF) and nanofiltration (NF). They are applied either individually as a single sieve or in combination as an integrated membrane array to meet the different requirements in the separation of bioactive compounds. Other new membrane processes with multiple functions have also been developed and employed for the separation or fractionation of bioactive compounds. The hybrid electrodialysis (ED)-UF membrane process, for example has been used to provide a solution for the separation of biomolecules with similar molecular weights but different surface electrical properties. In contrast, the affinity membrane technology is shown to have the advantages of increasing the separation efficiency at low operational pressures through selectively adsorbing bioactive compounds during the filtration process. Conclusion: Individual membranes or membrane arrays are effectively used to separate bioactive compounds or achieve multiple fractionation of them with different molecule weights or sizes. Pressure driven membrane processes are highly efficient and widely used. Membrane fouling, especially irreversible organic and biological fouling, is the inevitable problem. Multifunctional membranes and affinity membranes provide the possibility of effectively separating bioactive compounds that are similar in sizes but different in other physical and chemical properties. Surface modification methods are of great potential to increase membrane separation efficiency as well as reduce the problem of membrane fouling. Developing membranes and optimizing the operational parameters specifically for the applications of separation of various bioactive compounds should be taken as an important part of ongoing or future membrane research in this field.

Application of membrane separation processes in phosphorus recovery: A review

2021 ◽  
Vol 767 ◽  
pp. 144346
Author(s):  
Xiang Li ◽  
Shuting Shen ◽  
Yuye Xu ◽  
Ting Guo ◽  
Hongliang Dai ◽  
...  
Keyword(s):  
Membrane Separation ◽  
Phosphorus Recovery ◽  
Separation Processes

Membranes and Membrane Processes

MRS Bulletin ◽  
1999 ◽  
Vol 24 (3) ◽  
pp. 19-22 ◽  
Author(s):  
Vasilis N. Burganos
Keyword(s):  
Membrane Separation ◽  
Transport Coefficients ◽  
Electrical Potential ◽  
Artificial Organs ◽  
Energy Storage And Conversion ◽  
Electrical Potential Difference ◽  
Catalytic Reactors ◽  
Membrane Processes ◽  
Separation Science ◽  
Structural And Functional Properties

Membrane separation science has enjoyed tremendous progress since the first synthesis of membranes almost 40 years ago, which was driven by strong technological needs and commercial expectations. As a result, the range of successful applications of membranes and membrane processes is continuously broadening. An additional change lies in the nature of membranes, which is now extended to include liquid and gaseous materials, biological or synthetic. Membranes are understood to be thin barriers between two phases through which transport can take place under the action of a driving force, typically a pressure difference and generally a chemical or electrical potential difference.An attempt at functional classification of membranes would have to include diverse categories such as gas separation, pervaporation, reverse osmosis, micro- and ultrafiltration, and biomedical separations. The dominant application of membranes is certainly the separation of mixed phases or fluids, homogeneous or heterogeneous. Separation of a mixture can be achieved if the difference in the transport coefficients of the components of interest is sufficiently large. Membranes can also be used in applications other than separation targeting: They can be employed in catalytic reactors, energy storage and conversion systems, as key components of artificial organs, as supports for electrodes, or even to control the rate of release of both useful and dangerous species.In order to meet the requirements posed by the aforementioned applications, membranes must combine several structural and functional properties.

scholarly journals Analysis of ethanol dehydration using membrane separation processes

2020 ◽  
Vol 15 (1) ◽  
pp. 122-132 ◽  
Author(s):  
Carolina Conde-Mejía ◽  
Arturo Jiménez-Gutiérrez
Keyword(s):  
Capital Investment ◽  
Membrane Separation ◽  
Biomass Pretreatment ◽  
Ethanol Dehydration ◽  
Purification Step ◽  
Silica Membrane ◽  
Separation Processes ◽  
Fermentation Processes ◽  
Vapor Permeation ◽  
Type Zeolite

AbstractAfter the biomass pretreatment and fermentation processes, the purification step constitutes a major task in bioethanol production processes. The use of membranes provides an interesting choice to achieve high-purity bioethanol. Membrane separation processes are generally characterized by low energy requirements, but a high capital investment. Some major design aspects for membrane processes and their application to the ethanol dehydration problem are addressed in this work. The analysis includes pervaporation and vapor permeation methods, and considers using two types of membranes, A-type zeolite and amorphous silica membrane. The results identify the best combination of membrane separation method and type of membrane needed for bioethanol purification.

Biofilms: their structure, activity, and effect on membrane filtration

2005 ◽  
Vol 51 (6-7) ◽  
pp. 181-192 ◽  
Author(s):  
Z. Lewandowski ◽  
H. Beyenal
Keyword(s):  
Membrane Filtration ◽  
Membrane Separation ◽  
Separation Processes ◽  
Membrane Cleaning ◽  
Underlying Assumption ◽  
Structure Activity ◽  
Membrane Biofouling ◽  
Flux Decline ◽  
Cleaning Procedures ◽  
Near Future

The goal of this presentation is to identify biofouling mechanisms that cause undesirable effects to the membrane separation processes of flux decline and pressure drop. The underlying assumption of this presentation is that biofouling is unavoidable and that the operator cannot eliminate it entirely. This premise justifies research efforts toward understanding the mechanisms by which biofouling affects the membrane processes, rather than expecting that technology can entirely eliminate membrane biofouling in the near future. An improved understanding of biofouling mechanisms may lead to better membrane design, better membrane modules, and better membrane cleaning procedures.

APPLICATION OF ULTRASOUND IN MEMBRANE SEPARATION PROCESSES: A REVIEW

2006 ◽  
Vol 22 (3) ◽  
Author(s):  
Shobha Muthukumaran ◽  
Sandra E. Kentish ◽  
Geoff W. Stevens ◽  
Muthupandian Ashokkumar
Keyword(s):  
Membrane Separation ◽  
Separation Processes

Membrane Separation Processes

2019 ◽  
pp. 243-258
Author(s):  
Louis Theodore ◽  
R. Ryan Dupont
Keyword(s):  
Membrane Separation ◽  
Separation Processes
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