Dynamics of organic carbon and of bacterial populations in a conventional pretreatment train of a reverse osmosis unit experiencing severe biofouling

Schneider, René Peter; Ferreira, Lucas Moreira; Binder, P.; Bejarano, Eduardo Mora; Góes, K.P.; Slongo, E.; Machado, C.R.; Rosa, G.M.Z.

doi:10.1016/j.memsci.2005.05.006

Cited by 113 publications

(54 citation statements)

References 52 publications

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“…The GC analyses were performed in a gas chromatograph model HP6850A with a flame ionization detector (FID). Microbial characterizations were performed over the course of the enrichment and purification experiment using phase and fluorescence microscopy to observe the predominant cellular morphologies and the presence of methanogenic archaea, as described in Schneider et al [24]. After growing the culture, genomic DNA was extracted from the methanogenic archaea according to Massana et al [25].…”

Section: Culture-dependent Isolation Of Methanogenic Archaeamentioning

confidence: 99%

“…Scanning electron microscopy: A protocol adapted from Schneider et al [24] was used to observe cells by scanning electron microscopy (DSM 940A, Zeiss). To collect the cells, aliquots of the culture medium were removed with the aid of 1 mL sterile syringes and filtered through a 0.22-µm cellulose acetate membrane.…”

Section: Morphological Characterization Of Methanogenic Culturesmentioning

confidence: 99%

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Molecular Characterization of the Archaeal Community in an Amazonian Wetland Soil and Culture-Dependent Isolation of Methanogenic Archaea

et al. 2010

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Tropical wetlands are the major natural source of methane released into the atmosphere, producing about 60% of all natural emissions. The great wetland areas of the Amazon basin are the largest source of methane in this region, contributing an estimated 5% of the total emissions from the world's flooded areas. However, despite the important role that methanogenic archaea play in these environments, there have been few studies on the composition of their archaeal communities. In this survey, four 16S rRNA archaeal clone libraries from different depths were constructed to examine the archaeal community in an Amazon wetland soil. A total of 599 clones were used to perform diversity and phylogenetic analyses. A broad, diverse archaeal community was found at the site, with the diversity decreasing as the depth increased (Shannon index range: 2.40-1.94). Phylogenetic analysis revealed sequences belonging to two archaeal phyla, with 65% classified as Crenarchaeota and 35% classified as Euryarchaeota. Within the Euryarchaeota group, most sequences were clustered into the Methanococci and Methanomicrobia classes, two groups of methanogens. Based on the abundance of methanogenic organisms, culture-dependent isolation was used to isolate these organisms. To enhance the growth of methanogenic archaea, a modified atmosphere (H 2 :CO 2 = 80:20) was established combined with an anoxic environment for 18 months. Among the isolates, OPEN ACCESSDiversity 2010, 2 1027 the genera Methanosarcina and Methanobacterium were detected throughout the anaerobic in vitro cultivation, indicating a possible role for these organisms in methane production. In conclusion, these exploratory molecular and culture-dependent approaches enhance our understanding of the archaeal community and methanogenic archaea living in wetland soils of the eastern Amazon and their role in methane production.

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Section: Culture-dependent Isolation Of Methanogenic Archaeamentioning

confidence: 99%

Section: Morphological Characterization Of Methanogenic Culturesmentioning

confidence: 99%

Molecular Characterization of the Archaeal Community in an Amazonian Wetland Soil and Culture-Dependent Isolation of Methanogenic Archaea

et al. 2010

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“…Fouling is the precipitation of foulants on the membrane surface [109,110]. Foulant is any specie (solutes) which enters in interaction physically or chemically with the membrane [109]. They can be organic, inorganic, bio-compatible or colloidal [109,[111][112][113].…”

Section: Problems Arising In Ro Processmentioning

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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“…High-throughput sequencing technology can be used to address all three questions by providing insights on the dynamics of microbial populations on the membranes and in the water samples collected along the desalination process. However, most of these studies were performed on seawater in other geographical locations which has water quality distinct from that in the Arabian Gulf [8,[10][11][12] and limited studies were conducted on the Arabian Gulf waters [13].…”

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

2016

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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Dynamics of organic carbon and of bacterial populations in a conventional pretreatment train of a reverse osmosis unit experiencing severe biofouling

Cited by 113 publications

References 52 publications

Molecular Characterization of the Archaeal Community in an Amazonian Wetland Soil and Culture-Dependent Isolation of Methanogenic Archaea

Molecular Characterization of the Archaeal Community in an Amazonian Wetland Soil and Culture-Dependent Isolation of Methanogenic Archaea

Short Communication: Requiring Reverse Osmosis Membranes Modifications – An Overview

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

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