Hydrogenotrophic denitrification with immobilized Alcaligenes eutrophus for drinking water treatment

Chang, Chih Cheng; Tseng, Szu‐Kung; Huang, Hsien Kai

doi:10.1016/s0960-8524(98)00168-0

Cited by 104 publications

(57 citation statements)

References 8 publications

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“…H 2 ) compared to the available nitrate, due to the solubility (and thus bioavailability) limit of H 2 . Indeed, previously performed studies (Chang et al 1999;Haugen et al 2002;Karanasios et al 2011) indicated that a decrease of the dissolved H 2 concentration below a certain threshold (depending on the microbial species and other environmental conditions) would result in a decrease in denitrification rate. Initially, limitation of the hydrogen availability would only inhibit nitrite reductase, resulting in accumulation of nitrite.…”

Section: Impact Of Additional Electron Donors On the In Situ Nitrate mentioning

confidence: 99%

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Impact of the electron donor on in situ microbial nitrate reduction in Opalinus Clay: results from the Mont Terri rock laboratory (Switzerland)

et al. 2017

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At the Mont Terri rock laboratory (Switzerland), an in situ experiment is being carried out to examine the fate of nitrate leaching from nitrate-containing bituminized radioactive waste, in a clay host rock for geological disposal. Such a release of nitrate may cause a geochemical perturbation of the clay, possibly affecting some of the favorable characteristics of the host rock. In this in situ experiment, combined transport and reactivity of nitrate is studied inside anoxic and water-saturated chambers in a borehole in the Opalinus Clay. Continuous circulation of the solution from the borehole to the surface equipment allows a regular sampling and online monitoring of its chemical composition. In this paper, in situ microbial nitrate reduction in the Opalinus Clay is discussed, in the presence or absence of additional electron donors relevant for the disposal concept and likely to be released from nitrate-containing bituminized radioactive waste: acetate (simulating bitumen degradation products) and H 2 (originating from radiolysis and corrosion in the repository). The results of these tests indicate that-in case microorganisms would be active in the repository or the surrounding clay-microbial nitrate reduction can occur using electron donors naturally present in the clay (e.g. pyrite, dissolved organic matter). Nevertheless, non-reactive transport of nitrate in the clay is expected to be the main process. In contrast, when easily oxidizable electron donors would be available (e.g. acetate and H 2 ), the microbial activity will be strongly stimulated. Both in the presence of H 2 and acetate, nitrite and nitrogenous gases are predominantly produced, although some ammonium can also be formed when H 2 is present. The reduction of nitrate in the clay could have an impact on the redox conditions in the pore-water and might also lead to a gas-related perturbation of the host rock, depending on the electron donor used during denitrification.

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Section: Impact Of Additional Electron Donors On the In Situ Nitrate mentioning

confidence: 99%

“…Initially, limitation of the hydrogen availability would only inhibit nitrite reductase, resulting in accumulation of nitrite. Lowering the dissolved H 2 concentration even further would also inhibit the hydrogenotrophic nitrate reduction (Chang et al 1999). …”

Section: Impact Of Additional Electron Donors On the In Situ Nitrate mentioning

confidence: 99%

Impact of the electron donor on in situ microbial nitrate reduction in Opalinus Clay: results from the Mont Terri rock laboratory (Switzerland)

et al. 2017

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“…The use of polyurethane carriers with hydrogenotrophic denitrifiers fixed on the surface has been reported [90]. In a fluidized bed reactor, Alcaligenes eutrophus (hydrogenotrophic denitrifier) was immobilized in polyacrylamide and alginate copolymer [88]. Complete removal of 124 mg/L nitrate was achieved for more than 300 days of operation at a 2 h retention time with hydrogen saturated air in a flow-through, packedbed bioreactors using a pure Rhodocyclus sp culture [91].…”

Section: Hydrogenotrophic Denitrificationmentioning

confidence: 99%

A review of nitrate reduction using inorganic materials

Zhu

Getting

2012

Environmental Technology Reviews

100

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In a biological denitrification system for water and wastewater treatment, an external carbon source (electron donor) is usually needed to generate dedicated microbial communities if intrinsic organic substances are insufficient. Alternative sources of electron donors, especially inorganic donors, are becoming more and more attractive in order to replace or reduce carbon use. In this article, inorganic electron donors, i.e. zero-valent iron, ferrous ion, sulphur and hydrogen are reviewed. While carbon dioxide (greenhouse gas) is produced when organic electron donors are used, inorganic electron donors have the potential advantages to reduce a plant's carbon footprint, and prevent carbon eluting out of the system, as occurs with heterotrophic processes. While sulphur and hydrogen are promising for nitrate removal in terms of reaction kinetics and economical feasibility, zero-valent iron and ferrous ion show potential to be utilized as a supplement to heterotrophic denitrification, where it is anticipated that synergistic effects would occur with autotrophic and heterotrophic denitrification, and thus external carbon consumption can be reduced.

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“…Bu problemlerin üstesinden gelmek için reaksiyon ortamında hidrojeni oluşturabilen alternatif yaklaşımlar araştırılmıştır. Sıfır değerlikli demir (ZVI) önemli bir alternatif olarak Till vd., (1998) tarafından araştırılmış [1] ve denitrifikasyon sistemlerinde hidrojen ile ilgili problemlerin üstesinden anaerobik demir korozyonu (reaksiyon (2)) ile gelinebileceğini açıklamışlardır [18,1,16,19].…”

Section: Introductionunclassified

Nitrat İndirgenmesinde Nano Ölçekli Sıfır Değerlikli Demir (nZVI) Kullanımı

Türk¹,

Hanay²

2017

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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ÖzetNitrat yeraltı ve yüzeysel sulardaki kirletici unsurlardan biridir ve bu nedenle nitrat indirgenmesinde şimdiye kadar birçok farklı proses araştırılmıştır. Biyotik ve abiyotik olarak gerçekleştirilen nitrat indirgenmesinde çok çeşitli alternatifler mevcuttur. Bir diğer yönden nano ölçekli sıfır değerlikli demir (nZVI) atıksulardaki birçok kirleticinin giderimi için kullanılmaktadır. nZVI elektron verici özelliğinden dolayı daha çok kirleticilerin indirgenme çalışmalarında yer almıştır. Literatürde yer alan çalışmalar biyotik ve abiyotik indirgenmenin arka arkaya gerçekleştiği nZVI ile ototrofik denitrifikasyonun, bakteri-nZVI iş birliğinden dolayı diğer yöntemlere göre daha avantajlı olduğunu göstermektedir. Bu çalışmada da nitrat indirgenmesinde nZVI kullanımının rolü, avantajları ve indirgenme mekanizması, yapılan araştırmalardan derlenerek sunulmuştur.Anahtar kelimeler: Nano Ölçekli Sıfır Değerlikli Demir, Nitrat İndirgenmesi, Biyotik Denitrifikasyon, Abiyotik Denitrifikasyon. Use of Nanoscale Zero Valent Iron (nZVI) in Nitrate ReductionAbstract Nitrate is one of the pollutants in ground and surface waters and many different processes have been investigated up to now for nitrate reduction. There are various alternatives in biotic and abiotic nitrate reductions. On the other hand, nanoscale zero valent iron (nZVI) is used for the removal of many pollutants in wastewater. nZVI is nature electron donor, this leads its usage in many pollutants reduction. The researches in the literature show that autotrophic denitrification with nZVI, which is performed successively of biotic and abiotic reduction, is more advantageous than other methods due to the bacteria nZVI cooperation. In this study, the role of nZVI, the advantages and the mechanism of reduction in the reduction of nitrate, are presented by reviewing previous studies.

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Hydrogenotrophic denitrification with immobilized Alcaligenes eutrophus for drinking water treatment

Cited by 104 publications

References 8 publications

Impact of the electron donor on in situ microbial nitrate reduction in Opalinus Clay: results from the Mont Terri rock laboratory (Switzerland)

Impact of the electron donor on in situ microbial nitrate reduction in Opalinus Clay: results from the Mont Terri rock laboratory (Switzerland)

A review of nitrate reduction using inorganic materials

Nitrat İndirgenmesinde Nano Ölçekli Sıfır Değerlikli Demir (nZVI) Kullanımı

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