Temperature Enhanced Backwash

Aumeier, Benedikt M.; Yüce, Süleyman; Weßling, Matthias

doi:10.1016/j.watres.2018.05.007

Cited by 13 publications

(10 citation statements)

References 28 publications

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“…Most often, HCl, NaOH, hypochlorides and other oxidants (peracetic acid, and P3 Active Oxonia ® (Ecolab, Saint Paul, MN, USA) solutions) are used for these purposes [27][28][29][30][31][32][33][34]. Moreover, cleaning is carried out at a high temperature (60-90 • C) [35][36][37]. A number of articles have been devoted to the influence of these procedures on the structure and chemical properties of membranes.…”

Section: Impact Of Traditional Cleaning Methods On the Chemical Structure Of Iemsmentioning

confidence: 99%

A Review on Ion-Exchange Membranes Fouling during Electrodialysis Process in Food Industry, Part 2: Influence on Transport Properties and Electrochemical Characteristics, Cleaning and Its Consequences

et al. 2021

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Ion-exchange membranes (IEMs) are increasingly used in dialysis and electrodialysis processes for the extraction, fractionation and concentration of valuable components, as well as reagent-free control of liquid media pH in the food industry. Fouling of IEMs is specific compared to that observed in the case of reverse or direct osmosis, ultrafiltration, microfiltration, and other membrane processes. This specificity is determined by the high concentration of fixed groups in IEMs, as well as by the phenomena inherent only in electromembrane processes, i.e., induced by an electric field. This review analyzes modern scientific publications on the effect of foulants (mainly typical for the dairy, wine and fruit juice industries) on the structural, transport, mass transfer, and electrochemical characteristics of cation-exchange and anion-exchange membranes. The relationship between the nature of the foulant and the structure, physicochemical, transport properties and behavior of ion-exchange membranes in an electric field is analyzed using experimental data (ion exchange capacity, water content, conductivity, diffusion permeability, limiting current density, water splitting, electroconvection, etc.) and modern mathematical models. The implications of traditional chemical cleaning are taken into account in this analysis and modern non-destructive membrane cleaning methods are discussed. Finally, challenges for the near future were identified.

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Section: Impact Of Traditional Cleaning Methods On the Chemical Structure Of Iemsmentioning

confidence: 99%

A Review on Ion-Exchange Membranes Fouling during Electrodialysis Process in Food Industry, Part 2: Influence on Transport Properties and Electrochemical Characteristics, Cleaning and Its Consequences

et al. 2021

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“…The provision of decentralized water-treatment plants is the right choice, particularly in the rural villages of developing countries [15], where it is not sustainable to operate centralized water distribution and drainage systems [16,17]. Reliable disinfection of the treated water is of utmost importance due to its direct influence on human health [18].…”

Section: Decentralized Drinking-water Treatmentmentioning

confidence: 99%

Drinking-Water Supply for CKDu Affected Areas of Sri Lanka, Using Nanofiltration Membrane Technology: From Laboratory to Practice

Cooray

Wei

Zhang

et al. 2019

Water

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Installation of decentralized water-treatment plants is an ideal option to supply safe drinking water for rural communities. Presently in Sri Lanka, over 3.6 million villagers face acute water-quality problems, and chronic kidney disease of unknown etiology (CKDu) is also prevalent among this community. Most of the drinking water in these villages is unpalatable due to high hardness and salinity. As an interim measure, reverse-osmosis (RO) water-treatment plants are introduced to provide safe water. However, due to deficient electrolytes, RO-treated water tastes unpleasant to some consumers; hence, people refuse it after prolonged use. The operation, maintenance, and management of RO plants are other major problems. Aimed at providing safe drinking water to the rural sector in a cost-effective manner, in this study, we fabricated an automated drinking-water purification system based on nanofiltration (NF) membrane technology, which can remove divalent cations, dissolved organic carbon (DOC) and pathogens efficiently, and monovalent ions partially, and thus keep electrolytes to some degree. Ten commercial NF membranes were tested in a laboratory, for solute and DOC removal efficiency and robustness. The DF-90 membrane showed the highest removal of DOC and hardness, and it was therefore selected, to design a pilot NF drinking-water treatment plant. The adhered DOC by the membrane can be cleaned by NaOH solution (pH = 12). The pilot NF drinking-water treatment plant has been in use since September 2018, and it shows excellent performance of removing DOC, TDS, hardness, fluoride, and pathogens in groundwater, and the permeate water of the NF plant has been well-accepted by the stakeholders of the society. The dominant genus of source water, and throughout the two processes (NF and RO), is Pseudomonas, and their difference is significant in the concentrates of the NF and RO processes.

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“…Thus, it is particularly suited to increase the resilience of purification systems towards climate change due to its flexible and robust operation. The mode of operation resembles the operation of an Italian coffeemaker, a so-called moka, and it was described in detail by Aumeier et al [1]. TEB showed to be competitive with mechanical backwashing demonstrating its basic feasibility by exposing ceramic ultrafiltration membranes to model solutions and real river water for self-sustaining, decentralized drinking water purification [1,2].…”

Section: Introductionmentioning

confidence: 96%

“…The mode of operation resembles the operation of an Italian coffeemaker, a so-called moka, and it was described in detail by Aumeier et al [1]. TEB showed to be competitive with mechanical backwashing demonstrating its basic feasibility by exposing ceramic ultrafiltration membranes to model solutions and real river water for self-sustaining, decentralized drinking water purification [1,2]. In order to reduce the investment cost of the filtration systems, the use of polymeric membranes instead of ceramic membranes may be advantageous.…”

Section: Introductionmentioning

confidence: 99%

“…The Temperature Enhanced Backwash (TEB) is a cleaning method for porous membranes alternative to mechanical backwashing and chemical enhanced backwashing [1]. The TEB enables the elimination of the backwash pump and is supposed to prevent microbial recontamination in the membrane module and the permeate tank by autoclaving (steam sterilization and boiling).…”

Section: Introductionmentioning

confidence: 99%

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Polymeric Membranes With Sufficient Thermo‐Mechanical Stability to Deploy Temperature Enhanced Backwash

Aumeier

Vollmer

Lenfers

et al. 2021

Chemie Ingenieur Technik

Self Cite

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The alternative membrane cleaning method Temperature Enhanced Backwash exploits elevated temperatures of typically 125°C to realize high shear rate. This exceeds usual operating temperatures by far. Therefore, the thermo-mechanical properties of polymeric membranes were investigated. A repeated load cycle testing was suited and sensitive to detect the failure of membrane material and potting. All tested PES membranes showed to be stable during the repeated load cycle testing. The potting adhesive may be decisive, thus, a tensile test at 125°C is proposed.

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Temperature Enhanced Backwash

Cited by 13 publications

References 28 publications

A Review on Ion-Exchange Membranes Fouling during Electrodialysis Process in Food Industry, Part 2: Influence on Transport Properties and Electrochemical Characteristics, Cleaning and Its Consequences

A Review on Ion-Exchange Membranes Fouling during Electrodialysis Process in Food Industry, Part 2: Influence on Transport Properties and Electrochemical Characteristics, Cleaning and Its Consequences

Drinking-Water Supply for CKDu Affected Areas of Sri Lanka, Using Nanofiltration Membrane Technology: From Laboratory to Practice

Polymeric Membranes With Sufficient Thermo‐Mechanical Stability to Deploy Temperature Enhanced Backwash

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