Evaluation of different cleaning agents used for cleaning ultra filtration membranes fouled by surface water

Zondervan, Edwin; Roffel, Brian

doi:10.1016/j.memsci.2007.06.041

Cited by 163 publications

(67 citation statements)

References 32 publications

(20 reference statements)

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“…This could be explained due to a better removal of organics through oxidation of aromatic humic susbtances at elevated pH levels [35] as a consequence of the action of the sodium hypochlorite, followed by the oxidation effect of the hydrogen peroxide. This effect, not observed before for the combination of these two oxidants by previous authors, has been reported for alkaline and oxidant agents sequence, specially where organics foulants dominate [35][36][37][38]. In our case, the sodium hypochlorite provides alkaline and oxidation effect while hydrogen peroxide strengthens the oxidant effect.…”

Section: Figure 7 Effect Of Cleaning Agent Sequencesupporting

confidence: 74%

Cleaning of ultrafiltration membranes after the treatment of surface water: static–dynamic test

García-Fayos

Arnal

Sancho

2012

Desalination and Water Treatment

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Access to safe drinkable water is a basic human right and an international development goal. AQUAPOT international project, created by Chemical and Nuclear Engineering Department of the Polytechnic University of Valencia, has been focused on research and development of low-cost and effective water treatment technologies based on membrane technology able to be used in developing countries. After several years of intensive laboratory and field research, Aquapot's UF plants have been settled in different locations of Ecuador (province of Azuay) and Mozambique (province of Maputo). At present, most of the installed plants work successfully, producing drinking water suitable for human consumption and even for industrial use. However, installation of the designed UF-drinking water treatment facilities has shown that cleaning standard protocol of ultrafiltration membranes is not effective. This fact could affect microbiological quality and volume of the pure water produced and also life of the membrane and the UF-plant. In order to develop optimized cleaning protocols based on the use of common and accessible chemicals, Aquapot started an applied research studying several cleaning methods. Previous studies have been focussed in applying different types of cleaning: chemical cleaning (by means of static tests and dynamic tests) and physico-chemical cleaning (combining chemical reagents with the hydrodynamic action of air bubbles). This work describes the experimental procedure performed in static-dynamic cleaning test which combine soaking with dynamic circulation of cleaning solutions. Sodium hypochlorite and Hydrogen Peroxide at 25 ºC performed the best results, recovering permeate flux from 10 to 12 times respectively compared with fouled membranes. Main results obtained for the different chemical solutions tested at 25 and 40 ºC were also compared with previous chemical (static and dynamic test) and physico-chemical cleanning. Results showed that the tested cleaning protocol improves the effectiveness of the cleaning and recovers UF membrane performance even until 30 times, when sequence of cleaning is Sodium hypochlorite followed by hydrogen peroxide.

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Section: Figure 7 Effect Of Cleaning Agent Sequencesupporting

confidence: 74%

Cleaning of ultrafiltration membranes after the treatment of surface water: static–dynamic test

García-Fayos

Arnal

Sancho

2012

Desalination and Water Treatment

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“…A well-established and investigated chemical cleaning protocol was used to clean the RO membrane (Ang et al 2006;Zondervan & Roffel 2007;Madaeni & Mansourpanah, 2004). The cleaning solution included 0.2 mM EDTA (Sigma-Aldrich) at pH 10.5, and 10.0 mM SDS (SigmaAldrich) at pH 7.0.…”

Section: Ro Membrane Cleaningmentioning

confidence: 99%

“…In this context, the commonly used chemical cleaning agents fall into six categories: bases, acids, metal-chelating agents, surfactants, oxidizing agents, and enzymes (Al-Amoudi & Lovitt 2007;Zondervan & Roffel 2007). The use of anionic surfactants, such as sodium dodecylsulfate (SDS) together with a strong chelating agent such as ethylenediaminetetraacetic acid (EDTA), affects the fouling layer by weakening the cohesion forces between the foulants, as well as between the foulants and the membrane surfaces (Al-Amoudi & Lovitt 2007;Porcelli & Judd 2010).…”

Section: Introductionmentioning

confidence: 99%

Biofouling of reverse osmosis membranes: effects of cleaning on biofilm microbial communities, membrane performance, and adherence of extracellular polymeric substances

et al. 2017

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Laboratory-scale reverse osmosis (RO) flat-sheet systems were used with two parallel flow cells, one treated with cleaning agents and a control (ie undisturbed). The cleaning efforts increased the affinity of extracellular polymeric substances (EPS) to the RO membrane and altered the biofilm surface structure. Analysis of the membrane biofilm community composition revealed the dominance of Proteobacteria. However, within the phylum Proteobacteria, γ-Proteobacteria dominated the cleaned membrane biofilm, while β-Proteobacteria dominated the control biofilm. The composition of the fungal phyla was also altered by cleaning, with enhancement of Ascomycota and suppression of Basidiomycota. The results suggest that repeated cleaning cycles select for microbial groups that strongly attach to the RO membrane surface by producing rigid and adhesive EPS that hampers membrane performance.

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“…Various treatment technologies have been reported for heavy metals' removal, such as chemical precipitation (Meunier et al 2006), oxidation-reduction (Ramos et al 2009), adsorption (Rui et al 2016), ion exchange (Oehmen et al 2006) electrochemical treatment (Meunier et al 2006), physical membranes (Zondervan, Roffel 2007), and filtration (Leupin, Hug 2005).…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Pb(II) and Mo(VI) Removal by Kaolinite Impregnated with Zero-Valent Iron Particles

et al. 2017

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Abstract. In this work, kaolinite modified with zero-valent iron was synthesized and used as a sorbent for Pb(II) and Mo(VI) removal from aqueous solutions. The obtained material was characterized by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The methods revealed successful modification by the Fe 0 particles precipitation on the surface of well-ordered kaolinite. The sorption experiment results showed a significant increase of sorption capacity in relation to the raw kaolinite. The kaolinite with 25% content of Fe 0 was found to be the best material for Pb(II) and Mo(VI) removal, resulting in approximately 500 mmol·kg -1 and 350 mmol·kg -1 sorption, respectively. The possible mechanisms responsible for metals' removal were identified as reduction by Fe 0 'core' and adsorption on the iron hydroxides 'shell'. The study indicated that the obtained material is capable of efficient Pb(II) and Mo(VI) removal and may be an interesting alternative to other methods used for heavy metals' removal.

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Evaluation of different cleaning agents used for cleaning ultra filtration membranes fouled by surface water

Abstract: Evaluation of different cleaning agents used for cleaning ultra tiltration membranes fouled by surface water.

Cited by 163 publications

References 32 publications

Cleaning of ultrafiltration membranes after the treatment of surface water: static–dynamic test

Cleaning of ultrafiltration membranes after the treatment of surface water: static–dynamic test

Biofouling of reverse osmosis membranes: effects of cleaning on biofilm microbial communities, membrane performance, and adherence of extracellular polymeric substances

Efficiency of Pb(II) and Mo(VI) Removal by Kaolinite Impregnated with Zero-Valent Iron Particles

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