A method for evaluating antiscalant retardation of crystal nucleation and growth on RO membranes

Lyster, Eric; Kim, Myung-man; Au, James; Cohen, Yoram

doi:10.1016/j.memsci.2010.08.020

Cited by 70 publications

(30 citation statements)

References 54 publications

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“…5). Such results provide insight into possible approaches to combatting mineral scaling based on the use of antiscalants that would target either the early stages of crystal nucleation or the latter stage of crystal growth [71]. In this regard, comparison of the rates of surface crystallization at the early stages of scale development provides another measure for comparing the relative mineral scaling propensity of the different surfaces.…”

Section: Surface Crystallizationmentioning

confidence: 95%

Crystallization of calcium sulfate on polymeric surfaces

Lin

Shih

Lyster

et al. 2011

Journal of Colloid and Interface Science

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Section: Surface Crystallizationmentioning

confidence: 95%

Crystallization of calcium sulfate on polymeric surfaces

Lin

Shih

Lyster

et al. 2011

Journal of Colloid and Interface Science

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“…Antiscalants are chemical additives that interfere with the precipitation reaction of scales and weaken the adherence of scales to the membrane surface. The use of antiscalants has been proven to be effective in inhibiting scaling in RO, in conventional thermal processes such as MSF desalination, MED, and in heat exchanger and cooling-water applications [225][226][227][228]. Among the commonly used antiscalants are condensed polyphosphates, organophosphonates, and polyelectrolytes [229].…”

Section: Use Of Antiscalantsmentioning

confidence: 99%

Fouling and its control in membrane distillation—A review

Tijing

Woo

Choi

et al. 2015

Journal of Membrane Science

877

387

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Membrane distillation (MD) is an emerging thermally-driven technology that poses a lot of promise in desalination, and water and wastewater treatment. Developments in membrane design and the use of alternative energy sources have provided much improvement in the viability of MD for different applications. However, fouling of membranes is still one of the major issues that hounds the long-term stability performance of MD. Membrane fouling is the accumulation of unwanted materials on the surface or inside the pores of a membrane that results to a detrimental effect on the overall performance of MD. If not addressed appropriately, it could lead to membrane damage, early membrane replacement or even shutdown of operation. Similar with other membrane separation processes, fouling of MD is still an unresolved problem. Due to differences in membrane structure and design, and operational conditions, the fouling formation mechanism in MD may be different from those of pressure-driven membrane processes. In order to properly address the problem of fouling, there is a need to understand the fouling formation and mechanism happening specifically for MD. This review details the different foulants and fouling mechanisms in the MD process, their possible mitigation and control techniques, and characterization strategies that can be of help in understanding and minimizing the fouling problem.

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“…The addition of AS has been proven to be an effective method for retarding scaling in RO process [47][48][49]. In this study, a 2 ppm AS was dosed in the FS in order to see its effectiveness on FO scaling control.…”

Section: Scaling Control: As Addition and Rinsing Under Crossflow Conmentioning

confidence: 99%

Gypsum scaling during forward osmosis process—a direct microscopic observation study

Shan

Tang

2016

Desalination and Water Treatment

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A B S T R A C TThis study investigated the effect of supersaturation index (SI), ionic strength, membrane orientation, and antiscalant (AS) addition on gypsum scaling during forward osmosis (FO) desalination. Scaling tests were performed in a cross-flow FO system, and the development of gypsum scalants on FO membrane was directly observed using an optical microscope integrated with the FO filtration cell. Greater surface coverage by gypsum crystals and larger crystal sizes occurred on the scaled FO membranes for feed solutions (FS) with higher SI values accompanying with more severe flux reduction. At fixed Ca 2+ and SO 2À 4 concentrations, reducing the ionic strength of the FS from 0.55 to 0.15 M resulted in longer induction time. Nevertheless, more flux loss and surface coverage by scalants occurred at longer filtration duration for 0.15 M FS due to its greater ion activities and thus higher SI. The active layer facing (AL)-draw solution membrane orientation was found to be prone to internal scaling, which is likely as a result of unfavorable internal concentration polarization of scaling precursors inside the FO membrane support layer. On contrary, the AL-FS orientation had much more stable flux behavior. The current study also demonstrated the effectiveness of AS addition and rinsing under cross-flow conditions for FO scaling control.

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A method for evaluating antiscalant retardation of crystal nucleation and growth on RO membranes

Cited by 70 publications

References 54 publications

Crystallization of calcium sulfate on polymeric surfaces

Crystallization of calcium sulfate on polymeric surfaces

Fouling and its control in membrane distillation—A review

Gypsum scaling during forward osmosis process—a direct microscopic observation study

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