Effects of chemical cleaning on RO membrane inorganic, organic and microbial foulant removal in a full-scale plant for municipal wastewater reclamation

Yu, Ting; Li, Meng; Zhao, Qi; Shi, Yifeng; Hu, Hong-Ying; Lu, Yun

doi:10.1016/j.watres.2017.01.068

Cited by 109 publications

(30 citation statements)

References 39 publications

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“…Results have revealed that FNA can be used for both biomass and calcium carbonate scaling removal [381]. In a study by Yu et al [390], the effects of common alkaline and acid cleaning on membrane cleaning was investigated. Results have revealed that the use of the common agents have not only removed around 94% and 90% of the total bacteria available on the membranes, but also altered the microbial communities structure.…”

Section: Membrane Cleaningmentioning

confidence: 99%

Reverse osmosis desalination: A state-of-the-art review

et al. 2019

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Water scarcity is a grand challenge that has always stimulated research interests in finding effective means for pure water production. In this context, reverse osmosis (RO) is considered the leading and the most optimized membrane-based desalination process that is currently dominating the desalination market. In this review, various aspects of RO desalination are reviewed. Theories and models related to concentration polarization and membrane transport, as well as merits and drawbacks of these models in predicting polarization effects, are discussed. An updated review of studies related to membrane modules (plate and frame, tubular, spiral wound, and hollow fiber) and membrane characterization are provided. The review also discusses membrane cleaning and different pre-treatment technologies in place for RO desalination, such as feed-water pre-treatment and biocides. RO pre-treatment technologies, which include conventional (e.g., coagulationflocculation, media filtration, disinfection, scale inhibition) and non-conventional (e.g., MF, UF, and NF) are reviewed and their relative attributes are compared. As per the available literature, UF, MF and coagulation-flocculation are considered the most widely used pre-treatment technologies. In addition, this review discusses membrane fouling, which represents a serious challenge in RO processes due to its significant contribution to energy requirements and process economy (e.g., flux decline, permeate quality, membrane lifespan, increased feed pressure, increased pre-treatment and membrane maintenance cost). Different membrane fouling types, such as colloidal, organic, inorganic, and biological fouling, are addressed in this review. Principles of RO process design and the embedded economic and energy considerations are discussed. In general, cost of water desalination has dropped to values that made it a viable option, comparable even to conventional water treatment methods. Finally, an overview of hybrid RO desalination processes and the current challenges faced by RO desalination processes are presented and discussed.

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Section: Membrane Cleaningmentioning

confidence: 99%

Reverse osmosis desalination: A state-of-the-art review

et al. 2019

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“…The effect of alkaline reagents of ethylene diamine tetraacetic acid (EDTA) was used 147 as a chemical washing agent in the membrane of a SWRO desalination plant to remove fouling 148 on the membrane surface [37,38]. 149…”

Section: Chemical Washing Agentmentioning

confidence: 99%

Effect of chemical and physical factors on the crystallization of calcium sulfate in seawater reverse osmosis brine

et al. 2018

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A major challenge of the seawater reverse osmosis (SWRO) desalination process corresponds to the management of concentrated brine waste because discharging the brine back into the sea through submarine pipelines influences the marine ecosystem and incurs additional costs at coastal RO plants. A membrane distillation crystallizer (MDC) can further produce clean water and simultaneously recover valuable resources from the concentrated brine; this is more environmentally and economically optimal. The SWRO brine contains salts, which contribute to scaling development during the MDC operation. Hence, the main goals of this study include (i) observing the crystallization tendency of calcium sulfate (CaSO4) under high salinity and, (ii) examining other inorganic and organic compounds and operational conditions that affect the CaSO4 crystallization. The crystallization tendency of CaSO4 in SWRO brine 2 was examined with respect to different temperatures; changes in pH values; and in the presence of co-existing ions, chemical agents, and organic matters as well as physical factors. The results showed that the size and quantity of crystals formed increased with increasing heating temperatures. Furthermore, an increase in the pH values (from 5 to 9) increased the crystal size. At higher pH, the complexion of NaCl along with CaSO4 was created. Moreover, stirring 27 enhanced CaSO4 crystal formation due to the kinetic mechanism.

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“…To clean a fouled membrane, chemical cleaning is conducted once every few months [46,51,52]. The frequency of chemical cleaning is determined by the normalized performance of the RO membranes [46].…”

Section: Introductionmentioning

confidence: 99%

How RO membrane permeability and other performance factors affect process cost and energy use: A review

2019

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Reverse osmosis (RO) technology has progressed steadily over the last few decades. Those gains were achieved through improvements in both RO membrane element performance and energy recovery technologies. However, some recent literature indicates that RO membrane water permeability is approaching performance limits imposed by transport processes and thermodynamic constraints. This paper reviews how RO membrane element performance affects the cost of RO processes, especially the specific energy consumption. RO membrane performance encompasses water permeability, salt permeability, and other some characteristics of the RO element. This paper considers not only conventional RO processes, but also the recently proposed closed-circuit RO and batch RO processes. Even if the membrane water permeability increases, little additional effect is found when the membrane water permeability exceeds around 3 LMH/bar for seawater RO and 8 LMH/bar for brackish water RO in conventional single-stage RO. Increasing membrane water permeability has the potential to decrease membrane surface area and associated costs. A major limitation of most existing literature is that performance is evaluation on in terms of the initial operating conditions. Chronological changes, such as result from fouling, must also be considered to accurately validate how membrane element performance affects RO cost.

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Effects of chemical cleaning on RO membrane inorganic, organic and microbial foulant removal in a full-scale plant for municipal wastewater reclamation

Cited by 109 publications

References 39 publications

Reverse osmosis desalination: A state-of-the-art review

Reverse osmosis desalination: A state-of-the-art review

Effect of chemical and physical factors on the crystallization of calcium sulfate in seawater reverse osmosis brine

How RO membrane permeability and other performance factors affect process cost and energy use: A review

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