Fouling characteristics and their implications on cleaning of a FO-RO pilot process for treating brackish surface water

Chun, Youngpil; Zaviska, François; Kim, Sung-Jo; Mulcahy, Dennis; Yang, Euntae; Kim, In Soo; Zou, Linda

doi:10.1016/j.desal.2016.04.026

Cited by 40 publications

(24 citation statements)

References 61 publications

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“…However, the overall system's energy consumption may be greater than would be needed to recover water from the wastewater using MF-RO, because the salinity of the wastewater is so much lower than that of either seawater or seawater diluted with FO permeate. Further, the FO membranes themselves are not immune to fouling [198].…”

Section: Forward Osmosismentioning

confidence: 99%

“…Several studies which have autopsied membranes from full-or pilot-scale plants revealed that the most important types of fouling in wastewater reuse are organic/biological and inorganic. Tang et al [105,198,244] autopsied RO membranes used in a full-scale wastewater reclamation plant and compared the influent composition to the composition of the deposition on membranes in various positions in the train. On all membranes autopsied, the foulant layer was highly hydrated, with water content around 90%.…”

Section: Membrane Fouling: Overviewmentioning

confidence: 99%

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A review of polymeric membranes and processes for potable water reuse

Warsinger

Chakraborty

Tow

et al. 2018

Progress in Polymer Science

576

269

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Conventional water resources in many regions are insufficient to meet the water needs of growing populations, thus reuse is gaining acceptance as a method of water supply augmentation. Recent advancements in membrane technology have allowed for the reclamation of municipal wastewater for the production of drinking water, i.e., potable reuse. Although public perception can be a challenge, potable reuse is often the least energy-intensive method of providing additional drinking water to water stressed regions. A variety of membranes have been developed that can remove water contaminants ranging from particles and pathogens to dissolved organic compounds and salts. Typically, potable reuse treatment plants use polymeric membranes for microfiltration or ultrafiltration in conjunction with reverse osmosis and, in some cases, nanofiltration. Membrane properties, including pore size, wettability, surface charge, roughness, thermal resistance, chemical stability, permeability, thickness and mechanical strength, vary between membranes and applications. Advancements in membrane technology including new membrane materials, coatings, and manufacturing methods, as well as emerging membrane processes such as membrane bioreactors, electrodialysis, and forward osmosis have been developed to improve selectivity, energy consumption, fouling resistance, and/or capital cost. The purpose of this review is to provide a comprehensive summary of the role of polymeric membranes in the treatment of wastewater to potable water quality and highlight recent advancements in separation processes. Beyond membranes themselves, this review covers the background and history of potable reuse, and commonly used potable reuse process chains, pretreatment steps, and advanced oxidation processes. Key trends in membrane technology include novel configurations, materials and fouling prevention techniques. Challenges still facing membrane-based potable reuse applications, including chemical and biological contaminant removal, membrane fouling, and public perception, are highlighted as areas in need of further research and development.

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Section: Forward Osmosismentioning

confidence: 99%

Section: Membrane Fouling: Overviewmentioning

confidence: 99%

A review of polymeric membranes and processes for potable water reuse

Warsinger

Chakraborty

Tow

et al. 2018

Progress in Polymer Science

576

269

View full text Add to dashboard Cite

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“…It was known that different types of foulants and scalants were characterized in each RO elements according to its specific position within a pressure vessel [45,46]. Each RO element was autopsied for the extraction of the flat sheet membrane samples and the foulants accumulated on the membrane surfaces.…”

Section: Membrane and Foulant Analysismentioning

confidence: 99%

Long-Term Stability of Low-Pressure Reverse Osmosis (RO) Membrane Operation—A Pilot Scale Study

Park

Kwon

2018

Water

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Reverse osmosis (RO) elements operating at a low pressure (LP) or a low energy (LE) are generally called "LPRO" or "LERO", and the nomenclature "LP" and "LE" are convertible due to the interrelated features of the pressure and the energy in the RO process. Not only can LPRO be operated at lower pressures, which enables energy saving, but also at the standard operating pressure with an enhanced permeate flux. In this study, the feasibility of the LPRO element was evaluated in the face of high fouling potential feed water. The commercially available standard RO and LPRO were chosen, and the membrane properties including the fouling susceptibility and the surface characteristics were thoroughly evaluated. The variations of various performance parameters were monitored during an 872 h operation in a pilot system, which was operated in a constant flux mode. Then, the used membranes were analyzed to further verify the fouling load localization and the fouling intensities. The average flux variation of the individual RO elements in a vessel and the economic feasibility of LPRO were also evaluated through a simulation study using an RO system design software. This study showed that the localization of fouling load within a pressure vessel of an LPRO system caused about 20% higher flux decline and almost 2-times higher salt passage than those of a standard RO membrane system. Furthermore, the simulation study predicted that average operating pressure difference ratio (%) between two RO membranes decreased from 24.4% to 17.8% and a substantial quantity of LPRO elements (83.3%) must be replaced to meet the designated water criteria only after 2 years' operation.

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“…The combination of alginate, which is the main component of polysaccharides with calcium ions in water, could lead to a more pronounced decline in flux due to the formation of a cake layer or gel layer. Chun et al [28] reported that inorganic scaling, which was caused by calcium and phosphate and the interactions with other organic constituents in the feed solutions used, were the main cause of the reduction in flux of the membrane [28]. The cleaning of the inorganic scaling was, however, poor after using both physical and chemical methods.…”

Section: Inorganic Foulingmentioning

confidence: 99%

Fouling and Cleaning in Osmotically Driven Membranes

Chollom¹,

Rathilal²

2018

Osmotically Driven Membrane Processes - Approach, Development and Current Status

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Fouling is a phenomenon that occurs in all membrane processes. It is a complex problem, which limits the full operation of this technology. Fouling in pressure-driven membranes (PDMs) has been studied extensively, and the occurrence is well understood in that methods of mitigation have been proposed; however, limitations still occur for their full implementation. The use of osmotically driven membranes (ODMs) for water treatment is an emerging technology, which has shown some advantages such as low hydraulic pressure operation, high solute rejection and high recovery over PDMs. However, like in PDMs, fouling still presents a challenge. This chapter is aimed at evaluating the impact of fouling on the ODM performance, exploring the factors and mechanisms governing the fouling behaviour, developing approaches for mitigating fouling, elucidating the effect of membrane fouling and providing mitigation strategies as well as the causes of fouling in ODMs.

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Fouling characteristics and their implications on cleaning of a FO-RO pilot process for treating brackish surface water

Cited by 40 publications

References 61 publications

A review of polymeric membranes and processes for potable water reuse

A review of polymeric membranes and processes for potable water reuse

Long-Term Stability of Low-Pressure Reverse Osmosis (RO) Membrane Operation—A Pilot Scale Study

Fouling and Cleaning in Osmotically Driven Membranes

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