Enhanced gypsum scaling by organic fouling layer on nanofiltration membrane: Characteristics and mechanisms

Wang, Jiaxuan; Wang, Lei; Miao, Rui; Lv, Yongtao; Wang, Xudong; Meng, Xiaorong; Yang, Ruosong; Zhang, Xiaoting

doi:10.1016/j.watres.2016.01.019

Cited by 107 publications

(51 citation statements)

References 41 publications

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“…For stereochemical matching, experiments dealing with CaCO 3 crystallization have shown that stronger binders lead to higher heterogeneous nucleation rates because the net interfacial energy is lowered (Hamm et al, 2013). In the case of gypsum, it was reported that certain organic monolayers can accelerate gypsum nucleation kinetics Mann, 1994, Wang et al, 2016), to a degree that seems to correlate with the calcium binding capacities of those layers (Wang et al 2016). Moreover, such monolayers can also induce specific crystallographic orientations of gypsum crystals growing on these templates (Douglas and Mann, 1994).…”

Section: Mineralization In the Presence Of Prokaryotic Microorganismsmentioning

confidence: 99%

Calcium sulfate precipitation pathways in natural and engineered environments

2019

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The solution-mediated formation of calcium sulfate minerals, i.e. gypsum, anhydrite and bassanite, is a common process in both natural and engineered settings. It plays a key role in the global sulfur cycle and serves as an indicator of past environmental conditions on Earth and Mars. Products relying on the crystallization of these minerals have been employed since antiquity, and today they are an essential part of a wide array of industrial applications. Accordingly, the fundamental aspects of calcium sulfate mineralization have been the focus of intensive research during the past century. However, a recent flurry of studies addressing alternative, i.e. nonclassical, nucleation and growth mechanisms has spurred a revisit of the precipitation pathway of the most common phase, gypsum. The newly obtained data sketch a far more complex picture of the mineralization process than previously assumed. This has important consequences for the interpretation of calcium sulfate deposits, both from a geochemical and industrial point of view. In order to shed light on this issue, we discuss in this review both recent and long-standing observations of abiotic formation routes of calcium sulfate minerals as a function of the physicochemical solution properties. By integrating both the classical and non-classical perspectives on crystallization we put forward a unified model for calcium sulfate crystallization. Using this model, we (re)-evaluate the phase stability and transformations taking place in the CaSO 4-H 2 O system. Next, we look into the formation of calcium sulfate minerals occurring in close association with the biosphere. Employing the abiotic case scenario as a benchmarking tool, the possible influence and/or control exerted by biological activity (and its byproducts) on the precipitation pathway is critically reviewed. Finally, we point out the central issues that need to be resolved if we wish to fully understand and control the formation of calcium sulfate solids in natural and engineered environments.

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Section: Mineralization In the Presence Of Prokaryotic Microorganismsmentioning

confidence: 99%

Calcium sulfate precipitation pathways in natural and engineered environments

2019

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“…The water permeation flux of the alginate TFC NFMs dropped by only approximately 20 %d uring af iltration test in av ery harsh fouling environment containing Ca 2 + and alginate ( Figure 7b). This antifouling capacity was clearly better than that of commercialized TFC NFMs, and polyamide TFC NFMs prepared in laboratories, [53,54] tested under similar conditions. It has been arguedt hat fouling under these conditions is mainly caused by the interaction of Ca 2 + in the feed solution with carboxylic groups on the surfaces of TFCNFMs.However,t he alginate TFC NFMsw ith multiple carboxylic groups showeds urprisingly satisfactory antifouling properties.…”

Section: Performance Of the Alginate Tfc Nfmsmentioning

confidence: 99%

Ultrathin Alginate Coatings as Selective Layers for Nanofiltration Membranes with High Performance

Zhang

Zhong

et al. 2017

ChemSusChem

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It is highly desirable to develop environmentally friendly processes for fabricating thin-film composite (TFC) nanofiltration membranes (NFMs) from natural materials. However, the nanofiltration performance of such TFC NFMs is not satisfactory for practical applications owing to the lack of efficient methods for constructing ultrathin, uniform, stable coatings as selective layers. In this study, a contra-diffusion strategy is used to fabricate TFC NFMs with ultrathin cross-linked alginate coatings as selective layers without the use of any organic solvents. The as-prepared NFMs show a water permeation flux that is nearly one order of magnitude higher than that of other alginate-based TFC NFMs with similar salt rejection, and represents the best performance among all TFC NFMs from natural materials. These NFMs also demonstrate excellent mono-/divalent ion selectivity, as well as good long-term operation stability and antifouling properties. Furthermore, this strategy maximizes the reactant usage rate, minimizes the waste discharge and provides new insight into environmentally friendly fabrication of TFC NFMs.

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“…The carboxyl group density in TFC membranes can also influence membrane performance through scaling and fouling. For example, binding of calcium ions to surface carboxyl groups may increase gypsum scaling through enhanced surface nucleation [14,15].…”

Section: Introductionmentioning

confidence: 99%

A facile method to quantify the carboxyl group areal density in the active layer of polyamide thin-film composite membranes

Ding

Werber

Zhao

et al. 2017

Journal of Membrane Science

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Polyamide thin-film composite (TFC) membranes are the industry standard for membrane-based desalination. Negatively-charged carboxyl groups in the polyamide selective layer play an important role in membrane performance, affecting ion permeation, fouling, and scaling. As such, simple and accurate quantitation of the carboxyl group density is needed. While several methods already exist, each has important drawbacks that limit its application. In this study, we develop a simple bind-and-elute method utilizing silver ion probes, with silver quantitation performed using inductively coupled plasma mass spectrometry. First, the efficacy of the binding, wash, and elution steps is verified, most

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Enhanced gypsum scaling by organic fouling layer on nanofiltration membrane: Characteristics and mechanisms

Cited by 107 publications

References 41 publications

Calcium sulfate precipitation pathways in natural and engineered environments

Calcium sulfate precipitation pathways in natural and engineered environments

Ultrathin Alginate Coatings as Selective Layers for Nanofiltration Membranes with High Performance

A facile method to quantify the carboxyl group areal density in the active layer of polyamide thin-film composite membranes

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