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Editorial Reviews. From the Back Cover. MEMBRANE SYSTEMS FOR WASTEWATER site Store; ›; site eBooks; ›; Engineering & Transportation . Membrane processes are a fast-growing wastewater treatment option. Written by key experts in the wastewater industry, this reference provides. Get this from a library! Membrane systems for wastewater treatment. [Water Environment Federation.;] -- Membrane processes are a fast-growing wastewater .
While the performance of a single membrane separation process is sometimes unsatisfactory to meet the desired discharge or reuse requirement, hybrid membrane processes have been proposed as a viable mean to improve the quality of treated water.
The hybrid system typically refers to the coupling of membrane technology with one or more other process units, which can also be a membrane technology or conventional treatment processes such as coagulation and absorption [ 52 , 53 ]. These processes are integrated to complement each other and offer solutions to tackle the limitation of a single membrane system.
In the integrated system that consists of several stages of membrane processes, loose membranes such as UF and MF are used in the pretreatment unit to remove large oil droplets before subjected to more selective RO or MD processes [ 21 , 54 ]. While trace amounts of oil can still be detected in the permeate of MF and UF processes, RO and MD worked as an enhanced treatment process to further remove the small oil droplets in order to achieve almost complete oil removal and obtain high-quality water.
A recently developed FO-RO pilot system for produced water treatment has evidenced the production of high quality permeate [ 55 ].
Membrane systems for wastewater treatment
In this hybrid system, commercial cellulose triacetate spiral-wound FO membranes were used as pretreatment unit of raw produced water. The diluted draw solution was re-concentrated by the downstream RO system and returned to the FO system in a closed loop. The osmotic pressure difference and vapor pressure difference rendered by high salinity and temperature oily wastewater was used as the driving forces of the FO process and MD process, respectively [ 51 ].
Further treatment using MD also allows the continuous regeneration and reuse of the draw solution. Such an integrated system can be promisingly utilized to realize simultaneous oil recovery and energy utilization while achieving high quality water regeneration [ 57 ]. Membrane Fouling in Oil-Water Emulsion Separation System One of the most detrimental issues related to pressure-driven membrane processes, particularly reverse osmosis, is membrane fouling.
Fouling of membrane by oil droplet is a complex phenomenon controlled by many key factors such as surface chemistry, structure, and charges [ 58 ]. Besides the many efforts devoted on designing superoleophobic—superhydrophilic membrane surface to reduce the fouling propensity, fundamental and mechanistic investigations on the stages of oil droplet deposition on the membrane surface, the structure and formation dynamics of the oil layer as well as the effects of hydrodynamic conditions on fouling reversibility during the separation of emulsified oil have also been performed [ 59 ].
The understanding in these aspects can foster the development of innovative membranes and the establishment of operational approaches to minimize fouling and enhance the sustainability of the membranes. It is known that oil droplets can deform, break-up, and coalesce flexibly to affect the fouling characteristics. The fouling mechanisms of membranes by oil have been comprehensively reviewed by Huang et al.
In brief, three characteristic stages of membrane fouling have been identified i. In the first stage, the oil droplets transport to the membrane surface in a long range and initiate adhesion of to one another. The second stage event takes place as a result from the attractive force between droplets to adjust the droplet- droplet and droplet-membrane contact lines.
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You already recently rated this item. Your rating has been recorded. Write a review Rate this item: Preview this item Preview this item. Membrane systems for wastewater treatment Author: Water Environment Federation. New York ; London: McGraw Hill professional.
English View all editions and formats Summary: Membrane processes are a fast-growing wastewater treatment option. Written by key experts in the wastewater industry, this reference provides the most current membrane information available -- covering processes, equipment configurations, operation, routine monitoring, maintenance, and troubleshooting -- and includes questions and quizzes for classroom use and training.
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Membrane filtration processes
Document, Internet resource Document Type: Series Title: More information: Table of contents Contributor biographical information Publisher description Abstract: Provides membrane information - covering processes, equipment configurations, operation, routine monitoring, maintenance, and troubleshooting - and includes questions and quizzes for classroom use and training.
Read more Reviews User-contributed reviews Add a review and share your thoughts with other readers.HUBER uses for all membrane systems a high performance hydrophilic membrane which has very good filtration properties with a low affinity to fouling and covering layer forming material contained within the wastewater. Advanced Biological Treatment Processes. Yeshanew M. Takashi Asano. Their studies verified that membrane fouling by oil droplet is not solely determined by the oil droplet deposition, but also governed by the extent of droplet deformation.
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