Fifteen years of R&amp;D program in seawater desalination at KISR part I. Pretreatment technologies for RO systems

Ebrahim, S.; Abdel-Jawad, M.; Bou-Hamad, S.; Safar, M.

doi:10.1016/s0011-9164(01)00146-1

Cited by 67 publications

(23 citation statements)

References 4 publications

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“…For these reasons, it is necessary to incorporate a pretreatment method such as coagulation, flocculation, media filtration, multi-media filtration (MMF) and microfiltration/ultrafiltration (MF/UF) in desalination process prior to RO process [5].…”

Section: G R a P H I C A L Abstractmentioning

confidence: 99%

Characteristics of membrane fouling by consecutive chemical cleaning in pressurized ultrafiltration as pre-treatment of seawater desalination

et al. 2015

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Effect of chemical cleaning on pressurized UF as pre-treatment for desalination • NaOCl and oxalic acid showed the optimum results for recovering flux rate • The optimum cleaning combination was oxalic acid-NaOCl-oxalic acid. • Inorganic salts were found to adhere more on the membrane surface. • Hydrophobic foulants were removed easily by chemical cleaning on the surface.Chemical cleaning of membranes is one of the most important strategies in pressurized hollow fiber ultrafiltration (UF) as a pre-treatment for seawater desalination. Various physical cleaning strategies such as backwashing, aeration and air-scrubbing or chemically enhanced backwashing (CEB) have been investigated in order to remove foulants from the UF membrane. However, the limitation in their cleaning effects being found during long-term operation leads to the need of cleaning in place (CIP) for the recovery of membrane performance. In this study, we used oxalic acid and sodium hypochlorite as chemical cleaning agents. The cleaning in series of oxalic acid-sodium hypochlorite-oxalic acid showed the optimal cleaning efficiency and was applied for the consecutive chemical cleaning. The recovery efficiency of the CIP after first, second, third and fourth cleanings was 96.8%, 95.8%, 98.3% and 99.9%, respectively. It was almost fully recovered to the previous recovered value. However, membrane surface structure was deformed by contact with chemical cleaning agents during cleaning time, because, hydrophilic inorganic foulants are still adhered on the membrane surface even after several cleanings although hydrophobic organic foulants were removed easily by chemical cleaning. An improved CIP strategy should be developed to remove hydrophilic foulants for long-term operation of desalination plants.

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Section: G R a P H I C A L Abstractmentioning

confidence: 99%

Characteristics of membrane fouling by consecutive chemical cleaning in pressurized ultrafiltration as pre-treatment of seawater desalination

et al. 2015

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“…Conventional pretreatment systems that have been widely used include flocculation/coagulation and dual media/sand filtration [4][5][6] but these systems are generally not able to provide a stable silt density index (SDI) value in the RO feed water [5]. Changing sea water conditions result in high total suspended solids (TSS) which can result in breakthrough during conventional pretreatment and will adversely impact the performance of downstream RO systems.…”

Section: Introductionmentioning

confidence: 99%

“…Changing sea water conditions result in high total suspended solids (TSS) which can result in breakthrough during conventional pretreatment and will adversely impact the performance of downstream RO systems. Furthermore, large amount of chemicals have to be consumed to achieve good agglomeration of particulates for effective removal by dual-media filtration [6]. Several studies have concluded that ultrafiltration (UF) membranes can produce pretreated water quality that is more superior to that obtained from conventional pretreatment systems [4,5].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of microbial communities in an integrated ultrafiltration–reverse osmosis desalination pilot plant located at the Arabian Gulf

Hong

Moosa

Mink

2015

Desalination and Water Treatment

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This study demonstrated the use of high-throughput sequencing to assess the efficacy of an integrated Ultrafiltration (UF)-Reverse Osmosis (RO) desalination pilot plant located at the Arabian Gulf, and to identify potential microbial-associated problems that may arise in this plant.When integrated into the desalination treatment system, the UF membranes were able to serve as a good pretreatment strategy to delay RO fouling by achieving up to 1.96-log removal of cells from the seawater. Consequently, the differential pressure of the RO membrane remained around 1 bar for the entire 6-month study, suggesting no significant biofouling performance issue identified for this RO system. Examples of microbial populations effectively removed by the UF membranes from the feed waters included Nitrosoarchaeum limnia and phototrophic eukaryotes.Microbial-associated problems observed in this pilot plant included the presence of Pseudomonas spp. in coexistence with Desulfovibrio spp. These two bacterial populations can reduce sulfate and produce hydrogen sulfide, which would in turn cause corrosion problems or compromise membrane integrities. Chemical-enhanced backwashing (CEB) can be used as an effective strategy to minimize the associated microbial problems by removing bacterial populations including sulfate-reducers from the UF membranes.

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“…The high quality of RO water product attracted much attention in other applications such as wastewater treatment [3,4]. Due to the nature of oily wastewater, RO treatments were usually following some conventional pretreatments [5,6].…”

Section: Introductionmentioning

confidence: 99%

Scale-up economic assessment and experimental analysis of MF–RO integrated membrane systems in oily wastewater treatment plants for reuse application

et al. 2015

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Fifteen years of R&D program in seawater desalination at KISR part I. Pretreatment technologies for RO systems

Cited by 67 publications

References 4 publications

Characteristics of membrane fouling by consecutive chemical cleaning in pressurized ultrafiltration as pre-treatment of seawater desalination

Characteristics of membrane fouling by consecutive chemical cleaning in pressurized ultrafiltration as pre-treatment of seawater desalination

Dynamics of microbial communities in an integrated ultrafiltration–reverse osmosis desalination pilot plant located at the Arabian Gulf

Scale-up economic assessment and experimental analysis of MF–RO integrated membrane systems in oily wastewater treatment plants for reuse application

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