New disinfectant to control biofouling of polyamide reverse osmosis membrane

Yu, Jihyun; Baek, Youngbin; Yoon, Hai Jeon; Yoon, Jeyong

doi:10.1016/j.memsci.2012.09.057

Cited by 30 publications

(18 citation statements)

References 43 publications

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“…After cellulose acetate, it was the period of linear aromatic polyamide membrane [85]. It avoided a part of the disadvantages of cellulose acetate membranes [86].…”

Section: Ro Membrane Materialsmentioning

confidence: 99%

Short Communication: Requiring Reverse Osmosis Membranes Modifications – An Overview

Ghernaout¹

2017

AJCHE

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Do really reverse osmosis (RO) membranes need modification to cover their disadvantages or enhance their efficiency? Are there any defects in RO membranes manufacturing that require modification? These questions are discussed here in this short review. Through the world, there are thousands of patents, publications, and PhD theses dealing with surface modification and grafting of RO membranes. This growing phenomenon should attract the attention of the scientific community for technologic and economic reasons. Due to the increasing water pollution levels, which overpassed the RO membranes capacities, there is an urgent need to manufacture RO membranes, with multidisciplinary characteristics and high performance regarding both salts removal and fouling resistance, before sending them to the market and avoiding to think to their following modification.

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“…After cellulose acetate, it was the period of linear aromatic polyamide membrane [85]. It avoided a part of the disadvantages of cellulose acetate membranes [86].…”

Section: Ro Membrane Materialsmentioning

confidence: 99%

Short Communication: Requiring Reverse Osmosis Membranes Modifications – An Overview

Ghernaout¹

2017

AJCHE

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“…The details of the cross-flow RO system were described in our previous study [20]. Briefly, the membranes, each sized 3.3 × 6.8 cm 2 , were installed in four membrane cells with a height of 0.3 cm.…”

Section: Measurement Of Membrane Performancementioning

confidence: 99%

N-chlorosuccinimide as a novel agent for biofouling control in the polyamide reverse osmosis membrane process

Yu¹,

Shin

et al. 2015

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“…However, the application of free chlorine has been limited due to its potential negative effect on membrane integrity. Many studies reported that free chlorine can damage the active filtration layers of polyamide composite RO membranes, and eventually lead to membrane degradation and replacement [80][81][82][83]. In order to protect the integrity of polyamide composite RO membranes, process water containing free chlorine should always be dechlorinated before entering the RO instalments.…”

Section: Prevention Methodsmentioning

confidence: 99%

“…Although these biocides have less effects on membrane, all of them have been found to be less efficient at disinfecting than free chlorine [80].…”

Section: Prevention Methodsmentioning

confidence: 99%

“…In comparison, application of free chlorine is generally not recommended to protect the integrity of polyamide composite RO membranes as aforementioned ( § 2.4.1 Prevention Methods). Though alternative biocides such as monochloramine has less effect on polyamide composite membrane in compare to free chlorine, the efficiency of monochloramine in disinfection was found to be reduced [80]. By applying FNA, there is no need to evaluate the tradeoff between the effect of FNA on membrane and its efficiency in disinfection.…”

Section: Fna Versus Other Biocidesmentioning

confidence: 99%

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Biofouling control of reverse osmosis membranes using free nitrous acid

Filloux¹,

Wang²,

Pidou³

et al.

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Reverse osmosis (RO) membranes have been widely applied in membrane filtration processes for water purification, since the high selective RO membranes are designed to reject all materials with particle diameter larger than 10 angstrom (Å) [1]. However, this optimal selectivity leads to fouling that can greatly affect the performance and productivity of RO membranes. Biofouling remains as one of the major operational problems in RO processes and is caused by unwanted deposit and growth of microorganisms on the membrane. Numerous biofouling control strategies have been developed to restore the performance of RO membranes, but none of them are able to prevent or remove biofouling completely. A novel cleaning technique using a weak and monobasic acid (pKa=3.34, 25℃) named free nitrous acid (FNA) in combined with hydrogen dioxide (H 2 O 2 ) was proposed.The effects of FNA with or without H 2 O 2 on biofouling of RO membranes were investigated in Chapter 4, five RO membranes with different degree of biofouling were cleaned using FNA has achieved higher biomass removal than NaOH for both heavily fouled (86-96% versus 41-83%) and moderately fouled (92-95% against 89-92%) membranes, respectively.In accordance to the biomass removal, 6-32% of viable cells remained on the moderately fouled RO membranes under the impact of FNA cleaning (pH 3), whereas 38-58% of viable cells stayed on the heavily fouled RO membranes. These results revealed that FNA cleaning is more effective for moderately fouled membranes, implying that early cleaning for biofouling is preferable. Although applying FNA alone, or combining it with H2O2 have shown better efficiency at biofouling removal than NaOH, the cleaning efficiency has not been significantly improved (<1% of enhancement) by adding H 2 O 2 to FNA cleaning solutions. The effects of FNA on scaling of RO membranes were also studied using the same cleaning protocol developed for biofouling control. The results showed that FNA solutions at pH 2.0 and 3.0 were as efficient as conventional cleaning acids (hydrochloric acid and citric acid). The scaling layers which contain 32.4±1.7 g/cm 2 of calcium were completely removed by all acidic cleaning solutions. Based on the results, FNA is shown to be a promising ii cleaning agent for RO membrane biofouling and scaling removal.Further investigation focused on the effectiveness of FNA for biofouling prevention in RO processes (Chapter 5). The results showed that weekly FNA cleanings were unable to prevent fouling in the RO filtration systems, as the hydraulic performances (permeability and salt rejection) of RO membranes have gradually declined over two to three weeks filtration period.Although FNA cleaning was able to restore the permeability of RO membranes for one to two days, continuing declined permeability implied that the fouling rate was greater than the inhibition rate of FNA. The results of prevention tests also showed that FNA was more efficient at biomass inactivation and removal. The biomass contents and viable cells of the fouli...

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New disinfectant to control biofouling of polyamide reverse osmosis membrane

Cited by 30 publications

References 43 publications

Short Communication: Requiring Reverse Osmosis Membranes Modifications – An Overview

Short Communication: Requiring Reverse Osmosis Membranes Modifications – An Overview

N-chlorosuccinimide as a novel agent for biofouling control in the polyamide reverse osmosis membrane process

Biofouling control of reverse osmosis membranes using free nitrous acid

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