Diversity and dynamics of microbial communities at each step of treatment plant for potable water generation

Lin, Wenfang; Yu, Zhisheng; Zhang, Hongxun; Thompson, Ian P.

doi:10.1016/j.watres.2013.10.071

Cited by 138 publications

(105 citation statements)

References 56 publications

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“…A dominant fraction of the sand filter bacterial community belonged to the Proteobacteria (a-, b-, and c-Proteobacteria), Nitrospira, and Acidobacteria. These phyla have also been found to account for significant fractions of microbial communities from sand filters of full scale drinking water treatment plants (Pinto et al, 2012;White et al, 2012;Feng et al, 2013;Lin et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…The microbial community in the filtered water was very similar to the microbial community of the groundwater which might be due to the high flow rate (2.6 L min À1 ) and short residence time (<30 min) of the groundwater in the sand filter (Voegelin et al, 2014) limiting the exchange and transition between planktonic and surface associated microbial populations. Recent studies on biologically active sand filters have shown that sand filter microbial biofilms are stable and resistant to perturbations and fluctuations in the source water community (Pinto et al, 2012;Lin et al, 2014). However, other engineered microbial communities have been shown to be more dynamic, quickly responding to alterations in the chemical and biological source water composition (Kaewpipat and Grady, 2002;Moons et al, 2009).…”

Section: Sand Filter Colonizationmentioning

confidence: 99%

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Microbial community composition of a household sand filter used for arsenic, iron, and manganese removal from groundwater in Vietnam

et al. 2015

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Section: Discussionmentioning

confidence: 99%

Section: Sand Filter Colonizationmentioning

confidence: 99%

Microbial community composition of a household sand filter used for arsenic, iron, and manganese removal from groundwater in Vietnam

et al. 2015

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“…† At the phylum level, both were dominated by proteobacteria (>77%), which are commonly found in freshwater lake studies, 49 as well as in other drinking water systems. 14,15,[50][51][52] This phylum has also been shown to be stable and less influenced by water treatment processes and seasonal changes, thereby allowing it to persist in drinking water filters. 53 Among the proteobacteria, betaproteobacteria (almost entirely Burkholderiales) dominated both filters, but alphaproteobacteria were also abundant in the GAC, which is consistent with Lautenschlager et al (2014).…”

Section: Microbial Taxonomic Profile Of the Filtersmentioning

confidence: 99%

Impact of upstream chlorination on filter performance and microbial community structure of GAC and anthracite biofilters

Vera

Gerrity

Stoker

et al. 2018

Environ. Sci.: Water Res. Technol.

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a Drinking water filters may be operated to promote or deter biological activity through upstream oxidant addition. While there are several water quality benefits from biofiltration, microbial growth in biofilters warrants further investigation. In this study, routine monitoring detected target DNA sequences for Naegleria fowleri in source water and Acanthamoeba spp. in source water and biofilter effluent, triggering further microbial community characterization. Full-scale anthracite and granular activated carbon (GAC) filters receiving chlorinated waters were compared in terms of effluent water quality (i.e., turbidity and particle counts), biological activity (i.e., adenosine triphosphate (ATP)), and the composition of the microbial community (i.e., 16S/18S rRNA gene sequencing, free-living amoeba). Because of rapid chlorine quenching by GAC, greater biomass development was observed in the GAC biofilter (ATP = 5 × 10 3 -5 × 10 4 pg cm −3 media) than the anthracite filter (ATP = 4 × 10 2 -1 × 10 3 pg cm −3 media). Due to possible sloughed biomass, GAC effluent also had consistently greater turbidity, particle counts, and cellular ATP than the anthracite filter. 16S rRNA gene sequencing revealed distinct taxonomic differences between the anthracite and GAC filters, and GAC also hosted a more diverse population (Shannon index: GAC = 3.7-5.0 and anthracite = 2.4-2.9). At the genus level, the anthracite filter contained mostly Undibacterium-like taxon (45-68%), while the GAC biofilter was dominated by Massilia (8-36%), Herbaspirillum (2-44%), and unknown Comamonadaceae (9-18%), among others. The presence of viable free-living amoebas was also detected in the GAC biofilter media. Further characterization of the eukaryotic 18S rRNA gene showed that anthracite predominantly harbored copepod Leptodiaptomus (67%), while a majority of the sequences in GAC are unknown.

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“…Although these techniques provide for important screening tools for recent fecal contamination, the majority of microorganisms present in the environment are not culturable and methods such as high throughput sequencing are required to characterize unculturable bacteria in water supplies (Eichler et al, 2006;Revetta et al, 2010;Lin et al, 2014;Gomez-Alvarez et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Bacteria in drinking water sources of a First Nation reserve in Canada

Farenhorst

Jahan

et al. 2017

Science of The Total Environment

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Approximately 20% of the 600 First Nations reserves across Canada are under a drinking water advisory, often due to unacceptable levels of bacteria. In this study, we detected fecal bacteria at an alarmingly high frequency in drinking water sources in a fly-in First Nations community, most notably in buckets/drums of homes without running water where Escherichia coli levels ranged from 20 to 62,000 CFU/100mL. The water leaving the water treatment plant was free of E. coli and its free residual chlorine concentration (0.67 mg/L) was within the range typically observed for treated water in Canada. Water samples from taps in homes served by cisterns, and those sampled from the water truck and community standpipe, always showed unacceptable levels of E. coli (1 to 2,100 CFU/100mL) and free residual chlorine concentrations below the 0.2 mg/L required to prevent bacterial regrowth. Samples from taps in homes served by piped water had lower levels of E. coli (0 to 2 CFU/100mL). DNA-and RNA-based 16S rRNA Illumina sequencing demonstrated that piped and cisterns water distribution systems showed an abundance of viable cells of Alphaproteobacteria indicative of biofilm formation in pipes and cisterns. The alpha diversity, based on observed OTUs and three other indices, was lowest in water truck samples that supplied water to the cistern and the low free residual chlorine concentration (0.07 mg/L) and predominance of Betaproteobacteria (63% of viable cells) that were immediately detected after the truck had filled up at the water treatment plant was indicative of contamination by particulate matter. Given these findings, First Nation residents living without running water and relying on inadequate water distribution systems are at higher risk of contracting water-born illnesses. We urge all governments in Canada to expand their investments in supporting and sustaining water as a human right in Canada's First Nations communities. 3 GRAPHICAL ABSTRACT

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Diversity and dynamics of microbial communities at each step of treatment plant for potable water generation

Cited by 138 publications

References 56 publications

Microbial community composition of a household sand filter used for arsenic, iron, and manganese removal from groundwater in Vietnam

Microbial community composition of a household sand filter used for arsenic, iron, and manganese removal from groundwater in Vietnam

Impact of upstream chlorination on filter performance and microbial community structure of GAC and anthracite biofilters

Bacteria in drinking water sources of a First Nation reserve in Canada

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