Identification of scale deposits through membrane autopsy

Butt, F.H.; Rahman, Faizur; Baduruthamal, U.

doi:10.1016/0011-9164(95)00025-w

Cited by 53 publications

(20 citation statements)

References 2 publications

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“…The higher Al and Si concentrations were attributable to the presence 345 of alumino-silicates which might be contributing in membrane fouling phenomenon, 346 especially during initial phases (i.e., plugging of fibers). Significant fouling of CTA-RO 347 membranes by alumino-silicates has also been reported by Butt et al, 1995Butt et al, , 1997aButt et al, , 348 1997b. 349…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 67%

Does chlorination of seawater reverse osmosis membranes control biofouling?

Khan

Hong

Nada³

et al. 2015

Water Research

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 67%

Does chlorination of seawater reverse osmosis membranes control biofouling?

Khan

Hong

Nada³

et al. 2015

Water Research

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“…The use of aluminium sulphate as coagulant prior to the RO treatment could also elevate the Al concentration in the RO feed and contribute to the formation of aluminium silicates (Gabelich, 2005). It is noted that phosphonate-based antiscalants, as used in the present case, have been reported to be ineffective for suppressing the precipitation of aluminum silicates (Gabelich, 2005;Butt et al, 1995). The use of phosphonate-based antiscalant in the present case could also contribute to the relatively high levels of P observed in the matrix.…”

Section: Investigation Of the Membrane Surface And Cross-sections By mentioning

confidence: 74%

An autopsy study of a fouled reverse osmosis membrane element used in a brackish water treatment plant

et al. 2007

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The fouling of a spiral wound RO membrane after nearly one year of service in a brackish water treatment plant was investigated using optical and electron microscopic methods, FTIR and ICP-AES. Both the top surface and the cross-section of the fouled membrane were analysed to monitor the development of the fouling layer. It has been found that the extent of fouling was uneven across the membrane surface with regions underneath or in the vicinity of the strands of the feed spacer being more severely affected. The fouling appeared to have developed through different stages. In particular, it consisted of an initial thin fouling layer of an amorphous matrix with embedded particulate matter. The amorphous matrix comprised organic-Al-P complexes and the particulate matter was mostly aluminium silicates.Subsequently, as the fouling layer reached a thickness of about 5 to 7 μm, further amorphous material, which is suggested to include extracellular polymeric substances such as polysaccharides, started to deposit on top of the existing fouling layer. This secondary amorphous material did not seem to contain any particulate matter nor any inorganic elements 1 25 26 27 28 29 within it, but acted as a substrate upon which aluminium silicate crystals grew exclusively in the absence of other foulants, including natural organic matter (NOM).

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“…The fouling formed by deposits from small amounts of relatively inert suspended solids, which typically are silica, silicates, and previously precipitated scales, is called colloidal fouling. Metallic oxides also play a critical role in the cohesion of the scale formed or the fouling layer (69,70). Divalent cations (e.g., Ca þ2 ) were also proved to have a dramatic effect on fouling (71).…”

Section: Fouling and Cleaning Of Reverse Osmosismentioning

confidence: 99%

Membrane Technologies for Point-of-Use and Point-of-Entry Applications

Kajitvichyanukul

Hung

Wang

2010

Membrane and Desalination Technologies

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Point-of-use (POU) system is the treatment process aimed to treat only water intended for direct consumption (drinking and cooking), typically at a single tap or limited number of taps. Point-of-entry (POE) treatment devices are typically installed to treat all water entering a single home, business, school, or facility. Reverse osmosis (RO) is recognized by the industry as one of the top POU and POE treatment technologies. This chapter describes the advantages and limitations in using RO for POU and POE applications. Types and configurations of reverse osmosis, and installation, operation and maintenance, and testing of RO are also included.

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Identification of scale deposits through membrane autopsy

Cited by 53 publications

References 2 publications

Does chlorination of seawater reverse osmosis membranes control biofouling?

Does chlorination of seawater reverse osmosis membranes control biofouling?

An autopsy study of a fouled reverse osmosis membrane element used in a brackish water treatment plant

Membrane Technologies for Point-of-Use and Point-of-Entry Applications

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