Chemical control of colloidal fouling of reverse osmosis systems

Ning, Robert Y.; Troyer, Thomas L.; Tominello, Roger S.

doi:10.1016/j.desal.2004.06.192

Cited by 48 publications

(26 citation statements)

References 13 publications

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“…Like other types of fouling, the formation of a colloidal cake layer could also be impacted by feedwater characteristics such as the concentrations of the foulants and the physiochemical characteristics, membranes properties as well as operational conditions (Ju and Hong, 2014;Kim et al, 2014;Motsa et al, 2017;Ning et al, 2005). In many published papers, colloidal fouling is integrated into inorganic fouling or/and organic fouling and discussed as a whole.…”

Section: Colloidal Foulingmentioning

confidence: 99%

A review of reverse osmosis membrane fouling and control strategies

Jiang

Li²

2017

Science of The Total Environment

753

362

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Reverse osmosis (RO) membrane technology is one of the most important technologies for water treatment. However, membrane fouling is an inevitable issue. Membrane fouling leads to higher operating pressure, flux decline, frequent chemical cleaning and shorter membrane life. This paper reviews membrane fouling types and fouling control strategies, with a focus on the latest developments. The fundamentals of fouling are discussed in detail, including biofouling, organic fouling, inorganic fouling and colloidal fouling. Furthermore, fouling mitigation technologies are also discussed comprehensively. Pretreatment is widely used in practice to reduce the burden for the following RO operation while real time monitoring of RO has the advantage and potential of providing support for effective and efficient cleaning. Surface modification could slow down membrane fouling by changing surface properties such as surface smoothness and hydrophilicity, while novel membrane materials and synthesis processes build a promising future for the next generation of RO membranes with big advancements in fouling resistance. Especially in this review paper, statistical analysis is conducted where appropriate to reveal the research interests in RO fouling and control.Graphic Abstract

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Section: Colloidal Foulingmentioning

confidence: 99%

A review of reverse osmosis membrane fouling and control strategies

Jiang

Li²

2017

Science of The Total Environment

753

362

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“…Membrane technologies have issues that hinder their implementation, however, particularly with regard to fouling or scaling, and the management of considerable volumes of concentrated membrane residual [6]. Membrane scaling and fouling have received considerable research focus [7,8] that has produced process design criteria as well as technical anti-scaling and antifouling approaches to mitigate the problems [3,9,10]. Similar progress has not been made in improving the management of membrane residuals [5,6].…”

Section: Introductionmentioning

confidence: 98%

Electrolytic magnesium recovery from drinking water membrane residuals

Raman

Lenhart

2009

J Appl Electrochem

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The application of advanced membrane processes for drinking water treatment is hampered by the management of the concentrated membrane residuals. This byproduct is typically treated as waste, with the associated costs for disposal. In this study we tested electrolysis as an approach to recover potentially useful products from this waste stream, mitigating its cost of disposal. Aqueous solutions of Mg(NO 3 ) 2 , MgCl 2 , or MgSO 4 similar in concentration to those measured in typical membrane concentrates were utilized as test solutions. Cathodic reduction of these solutions resulted in the deposition of brucite, Mg(OH) 2 , coatings on the surface of the carbon electrode. Recovery was tested in potentiostatic and galvanostatic modes as a function of process parameters and solution composition. Recovery was observed to increase with time, applied voltage, and cell current. The mass deposited also depended upon the electrolyte anion, with under the conditions studied solutions of MgCl 2 being the most amenable to electrolysis.

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“…Antifoulants acting as anti-coagulants for colloidal foulants and dispersants for colloidal coagulates are specifically developed for colloidal sulfur, silica and microbial slime in brackish water (Ning et al, 2005). Simultaneous use of an antiscalant along with an antifoulant has long been used in medium-sized RO systems.…”

Section: Antifoulantmentioning

confidence: 99%

“…The application of antifoulants as anti-coagulants and dispersants of colloidal matter in seawater (Ning, 2003;Ning et al, 2005) show promise, but not yet adopted on large scale.…”

Section: Antifoulantmentioning

confidence: 99%

“…For this reason it is commonly called threshold inhibition mechanism. Antifoulants for controlling colloidal fouling works on the principle of keeping the colloidal particles from coagulating or even dispersing the coagulate once formed on the membrane (Ning et al 2005;Ning and Troyer, 2007;Ning, 2009) . Colloidal iron and manganese compounds, due to their positively charged characteristics are particularly sticky on the negatively charged membranes (Ning, 2009).…”

Section: Mechanisms Of Foulingmentioning

confidence: 99%

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