Selenate removal in biofilm systems: effect of nitrate and sulfate on selenium removal efficiency, biofilm structure and microbial community

Tan, Lea Chua; Espinosa-Ortiz, Erika J.; Nancharaiah, Y.V.; Hullebusch, Eric D. van; Gerlach, Robin; Lens, Piet N.L.

doi:10.1002/jctb.5586

Cited by 23 publications

(9 citation statements)

References 45 publications

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“…As shown in Figure 5, R1 and R2 had very different community structures that changed with either electron-acceptor or -donor availability. Despite lack of NO 3 − , the abundant genera in R1 were DB Methyloversatilis, Denitratisoma, and Dechloromonas (Tan, Espinosa-Ortiz, et al, 2018). Also present was the SRB Desulfovibrio and the fermenting bacterium Propionivibrio (Okabe et al, 2003).…”

Section: Microbial Biofilms Diversity Ecological Indexes and Community Structurementioning

confidence: 99%

“…DB, SRB, and SeRB can co-exist (Subedi et al, 2017), which introduces the possibility of competition, such as for a common electron donor. Having simultaneously available NO 3 − , SO 4 2− , and SeO 4 2− as electron acceptors often can lead to competition among microbial groups (particularly when NO 3 − and SeO 4 2− are present together; Lai et al, 2014Lai et al, , 2016 or even inhibition of one microbial process (Shi et al, 2020 (Shi et al, 2020), SO 4 2− favored SeO 4 2− reduction (Tan, Espinosa-Ortiz, et al, 2018), or no effect was seen (Oremland et al, 1989). Furthermore, some studies reported that SeO 4 2− reduction can occur along with NO 3 − and SO 4 2− reductions at a Se:N:S molar ratio of 1:40:100 (Tan et al, 2018a).…”

Section: Introductionmentioning

confidence: 99%

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Microbial ecology in selenate‐reducing biofilm communities: Rare biosphere and their interactions with abundant phylotypes

Esquivel-Hernández

García‐Pérez

et al. 2021

Biotech & Bioengineering

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Selenate (SeO 4 2− ) reduction in hydrogen (H 2 )-fed membrane biofilm reactors (H 2 -MBfRs) was studied in combinations with other common electron acceptors. We employed H 2 -MBfRs with two distinctly different conditions: R1, with ample electron-donor availability and acceptors SeO 4 2− and sulfate (SO 4 2− ), and R2, with electron-donor limitation and the presence of electron acceptors SeO 4 2− , nitrate (NO 3 − ), and SO 4 2− . Even though H 2 was available to reduce all input SeO 4 2− and SO 4 2− in R1, SeO 4 2− reduction was preferred over SO 4 2− reduction. In R2, co-reduction of NO 3 − and SeO 4 2− occurred, and SO 4 2− reduction was mostly suppressed. Biofilms in all MBfRs had high microbial diversity that was influenced by the "rare biosphere" (RB), phylotypes with relative abundance less than 1%. While all MBfR biofilms had abundant members, such as Dechloromonas and Methyloversatilis, the bacterial communities were significantly different between R1 and R2. For R1, abundant genera were Methyloversatilis, Melioribacter, and Propionivibrio; for R2, abundant genera were Dechloromonas, Hydrogenophaga, Cystobacter, Methyloversatilis, and Thauera. Although changes in electron-acceptor or -donor loading altered the phylogenetic structure of the microbial communities, the biofilm communities were resilient in terms of SeO 4 2− and NO 3 − reductions, because interacting members of the RB had the capacity of respiring these electron acceptors.

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Section: Microbial Biofilms Diversity Ecological Indexes and Community Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microbial ecology in selenate‐reducing biofilm communities: Rare biosphere and their interactions with abundant phylotypes

Esquivel-Hernández

García‐Pérez

et al. 2021

Biotech & Bioengineering

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“…Interestingly, characterization using high-end microscopic and spectroscopic techniques revealed the formation of biogenic Se (0)-Te(0) nanostructures, entrapped in the sludge granules, during simultaneous reduction of Se and Te oxyanions (Wadgaonkar et al, 2018c , individually, on Se removal in continuous operation, a correlation with different reactor configurations, microbial growth system, and co-oxyanions was observed. SO 4 2− was shown to be a controlling factor in biofilm systems using a drip flow reactor (DFR) (Tan et al, 2018a) and biotrickling filter (BTF) (Tan et al, 2018c) achieving both higher Se removal and more biofilm growth/formation when SO 4 2− was present. In contrast, the UASB reactor did not reveal any changes, either increase or decrease, in Se removal efficiencies, when SO 4 2− was removed from (Tan et al, 2018d) or included (Tan et al, 2018c) in the feed solution.…”

Section: Presence Of Telluriummentioning

confidence: 99%

“…SeO 4 2− reduction can be carried out by various microorganisms including denitrifiers and sulfate reducers. The microbial community analysis revealed the presence of high relative abundances of denitrifiers along with a small proportion of sulfate reducers, irrespective of the presence of NO 3 − (Tan et al, 2018a(Tan et al, , 2018d (DeMoll-Decker & Macy, 1993;Nancharaiah & Lens, 2015a). It was hypothesized that the presence of NO 3 − can promote a higher state of metabolic activity in microorganisms (Oremland et al, 1999).…”

Section: Presence Of Telluriummentioning

confidence: 99%

In situ and ex situ bioremediation of seleniferous soils and sediments

Wadgaonkar¹,

Lens²

2021

Environmental Technologies to Treat Selenium Pollution

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The importance of environmental selenium (Se) research has been increasingly recognized during the last decade (Nancharaiah & Lens, 2015a;Tan et al., 2016). The concerns about Se toxicity began in the 1930s, when symptoms for alkali disease and blind staggers were observed in livestock grazing on grass grown on Se-enriched soil in South Dakota (Tinggi, 2003). On the other hand, Se deficiency was brought to the forefront in the 1960s with identification of a peculiar heart muscle disease symptom, called Keshan's disease, in China (Chen, 2012).In animals and humans, selenium plays an important role in the redox regulation of intracellular signaling, redox homeostasis and thyroid hormone metabolism (Huawei, 2009;Papp et al., 2007). To avoid deficiency and toxicity, the United States National Academy of Sciences Panel on Dietary Oxidants and Related Compounds recommended a dietary allowance of 55 µg Se day −1 in humans and set an upper tolerable limit of 400 µg Se day −1 (World Health Organization, 2011). The United Kingdom Expert Group on Vitamins and Minerals ( 2003) recommended a minimum intake of 60 µg Se day −1 for women and 70 µg Se day −1 for men.The amount of selenium in the food chain, and thus in the human diet, depends on the selenium concentrations in the soil. Therefore, soil is the most important part of

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“…To reduce selenate at very low concentrations, a fixed-bed biofilm reactor (FBBR) might be more suitable from the engineering point of view than a suspended growth reactor because it is designed to prevent microbial washout while keeping the biocatalysts, i.e., selenate reducing bacteria, in the system longer. Moreover, the potential of biofilm reactors can be extended via a long acclimation period [12], which can simultaneously reduce selenate and other anions, such as nitrate and perchlorate, even in diluted agricultural or coal-mining drainage [13]. However, such simultaneous reductions make it difficult to rationalize how the microbial acclimation affects selenate reduction with other oxyanions and how the carbon and energy source limitations alter the reduction of selenate and other oxyanions in the biofilm reactor.…”

Section: Introductionmentioning

confidence: 99%

Carbon Source Competition in Biological Selenate Reduction under Other Oxyanions Contamination

2020

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Selenate removal in drinking water is being vigorously debated due to the various health issues concerned. As a viable treatment option, this study investigated a fixed-bed biofilm reactor (FBBR) with internal recycling. The experimental design tested how hydraulic loading rate and electron donor affect selenate reduction together with other oxyanions. The tested accompanying oxyanions were nitrate and perchlorate and experiments were designed to test how an FBBR responded to the limited electron donor condition. The results showed that the reactor achieved almost complete selenate reduction with the initial hydraulic loading rate of 12 m3/m2/day (influent concentration of 1416 µg SeO42−/L). Increasing the hydraulic loading rates to 16.24 and 48 m3/m2/day led to a gradual decline in selenate removal efficiency. A sufficient external carbon source (C:N of 3.3:1) achieved an almost complete reduction of nitrate as well as selenate. The FBBR acclimated to selenate instantaneously and reduced nitrate via synergistic denitrification. An experiment with another oxyanion addition, perchlorate (459 µg ClO4−/L), revealed that perchlorate-reducing bacteria were more strongly associated with carbon limitation than selenate-reducing bacteria, which can help us to understand parallel reactions in FBBRs. This research provides a framework to further study the use of electron donor-controlled FBBRs for simultaneous reduction of selenate and other oxyanions threatening the drinking water-related environment and public health.

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Selenate removal in biofilm systems: effect of nitrate and sulfate on selenium removal efficiency, biofilm structure and microbial community

Cited by 23 publications

References 45 publications

Microbial ecology in selenate‐reducing biofilm communities: Rare biosphere and their interactions with abundant phylotypes

Microbial ecology in selenate‐reducing biofilm communities: Rare biosphere and their interactions with abundant phylotypes

In situ and ex situ bioremediation of seleniferous soils and sediments

Carbon Source Competition in Biological Selenate Reduction under Other Oxyanions Contamination

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