Nitrate stimulation of indigenous nitrate-reducing, sulfide-oxidising bacterial community in wastewater anaerobic biofilms

García‐de‐Lomas, Juan; Corzo, Alfonso; Guisado, María del Carmen Portillo; Gonzalez, Juan M.; Andrades, José A.; Sáiz‐Jiménez, Cesáreo; García‐Robledo, Emilio

doi:10.1016/j.watres.2007.04.004

Cited by 79 publications

(47 citation statements)

References 29 publications

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“…This might potentially suggest that these species are crucial to S 0 recovery process. In DSR model, the NR-SOB was very likely acclimatized and stimulated by the increased concentration of nitrate and sulfide in influent medium as previously reported (De Gusseme et al, 2009;Garcia-de-Lomas et al, 2007). On the contrary, the sulfide concentration in ISDD model was relatively low in initial feeding wastewater and was greatly limited by sulfate reduction rate, which could effectively inhibit NR-SOB during this period.…”

Section: Discussionsupporting

confidence: 56%

“…Under anaerobic conditions, sulfate can be reduced to sulfide by sulfate-reducing bacteria (SRB) which may result in severe corrosive damage to sewer, and toxic effect on ecosystems, and human health (Garcia-de-Lomas et al, 2007;Rattanapan et al, 2009;Wiessner et al, 2005). In order to solve the problems, biological SDD process system has been proposed (Wang et al, 2005), and it seems to be a promising strategy since it is environmentally friendly and cost-effective.…”

Section: Introductionmentioning

confidence: 99%

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GeoChip-based analysis of the microbial community functional structures in simultaneous desulfurization and denitrification process

Chen

et al. 2014

Journal of Environmental Sciences

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The elemental sulfur (S 0 ) recovery was evaluated in the presence of nitrate in two development models of simultaneous desulfurization and denitrification (SDD) process. At the loading rates of 0.9 kg S/(m 3 ·day) for sulfide and 0.4 kg N/(m 3 ·day) for nitrate, S 0 conversion rate was 91.1% in denitrifying sulfide removal (DSR) model which was higher than in integrated simultaneous desulfurization and denitrification (ISDD) model (25.6%). A comprehensive analysis of functional diversity, structure and metabolic potential of microbial communities was examined in two models by using functional gene array (GeoChip 2.0). GeoChip data indicated that diversity indices, community structure, and abundance of functional genes were distinct between two models. Diversity indices (Simpson's diversity index (1/D) and Shannon-Weaver index (H′)) of all detected genes showed that with elevated influent loading rate, the functional diversity decreased in ISDD model but increased in DSR model. In contrast to ISDD model, the overall abundance of dsr genes was lower in DSR model, while some functional genes targeting from nitrate-reducing sulfide-oxidizing bacteria (NR-SOB), such as Thiobacillus denitrificans, Sulfurimonas denitrificans, and Paracoccus pantotrophus were more abundant in DSR model which were highly associated with the change of S 0 conversion rate obtained in two models. The results obtained in this study provide additional insights into the microbial metabolic mechanisms involved in ISDD and DSR models, which in turn will improve the overall performance of SDD process.

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Section: Discussionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

GeoChip-based analysis of the microbial community functional structures in simultaneous desulfurization and denitrification process

Chen

et al. 2014

Journal of Environmental Sciences

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“…Major interactions were observed between nitrate and sulphate metabolism in microorganisms that are present in diverse anaerobic ecosystems (Garcia-de-Lomas et al, 2007;Hubert and Voordouw, 2007;van Zijderveld et al, 2010). Importantly, many SRB appear to have dual roles, that is, they reduce inorganic and organic sulphur, and the majority of them can reduce nitrite to ammonia.…”

Section: Sulphate-reducing Bacteriamentioning

confidence: 99%

“…Moreover, an additive effect was observed on decrease in CH 4 emission in vivo when sulphate (2.6% of DM) and nitrate (2.6% of DM) were used together (van Zijderveld et al, 2010). In anaerobic environments, H 2 S can act as an electron donor for nitrite ammonification in nitrate-reducing-sulphide-oxidising bacteria (NR-SOB) (Garcia-de-Lomas et al, 2007;Hubert and Voordouw, 2007). These bacteria reduce nitrate to nitrite and oxidise sulphide to sulphate when further reducing nitrite to ammonia.…”

Section: Sulphate-reducing Bacteriamentioning

confidence: 99%

The use of direct-fed microbials for mitigation of ruminant methane emissions: a review

Jeyanathan

Martin

Morgavi

2014

Animal

118

115

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Concerns about the environmental effect and the economic burden of methane (CH 4 ) emissions from ruminants are driving the search for ways to mitigate rumen methanogenesis. The use of direct-fed microbials (DFM) is one possible option to decrease CH 4 emission from ruminants. Direct-fed microbials are already used in ruminants mainly to increase productivity and to improve health, and are readily accepted by producers and consumers alike. However, studies on the use of DFM as rumen CH 4 mitigants are scarce. A few studies using Saccharomyces cerevisiae have shown a CH 4 -decreasing effect but, to date, there has not been a systematic exploration of DFM as modulators of rumen methanogenesis. In this review, we explored biochemical pathways competing with methanogenesis that, potentially, could be modulated by the use of DFM. Pathways involving the redirection of H 2 away from methanogenesis and pathways producing less H 2 during feed fermentation are the preferred options. Propionate formation is an example of the latter option that in addition to decrease CH 4 formation increases the retention of energy from the diet. Homoacetogenesis is a pathway using H 2 to produce acetate, however up to now no acetogen has been shown to efficiently compete with methanogens in the rumen. Nitrate and sulphate reduction are pathways competing with methanogenesis, but the availability of these substances in the rumen is limited. Although there were studies using nitrate and sulphate as chemical additives, use of DFM for improving these processes and decrease the accumulation of toxic metabolites needs to be explored more. There are some other pathways such as methanotrophy and capnophily or modes of action such as inhibition of methanogens that theoretically could be provided by DFM and affect methanogenesis. We conclude that DFM is a promising alternative for rumen methane mitigation that should be further explored for their practical usage.

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“…Con base en los perfiles de sulfuro medidos con microelectrodos, se pueden calcular los flujos difusivos de esta sustancia en el interior de la biopelícula, mediante la primera Ley de Fick (Ec. (8)), de acuerdo a Garcia-de-Lomas et al [31] .…”

Section: Microgradientes Físico-químicos En El Interior De La Biopelíunclassified

Efecto de la biopelícula en la corrosión de aceros inoxidables

et al. 2010

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ResumenEn este trabajo se ha estudiado la influencia de las biopelículas en los procesos de corrosión de diferentes aleaciones de acero inoxidable, situadas durante 4 años en dos puntos de una estación depuradora de aguas residuales. Se caracterizó el microambiente físico-químico en el interior de las biopelículas mediante microelectrodos de O 2 , H 2 S y pH, y se cuantificaron las tasas de corrosión a partir del número, diámetro y profundidad de picadura. Los resultados obtenidos muestran un desarrollo más notable de las biopelículas y un número de picaduras significativamente mayor en el canal de salida de desbastes que en el canal de recirculación de fangos. Con base en las características del agua sobrenadante y en las medidas realizadas con microelectrodos, se sugiere que la biopelícula induce la corrosión a través de tres posibles mecanismos: creación de celdas de aireación diferencial, zonas con diferente pH y zonas con elevada producción de sulfuro capaz de reaccionar con iones metálicos. Palabras claveBiopelículas; Biocorrosión; Acero inoxidable; Microelectrodos; Sulfuro. Effect of biofilm in the corrosion of austenitic stainless steels in wastewater treatment plants AbstractIn this work, the influence of the biofilms in the corrosion process of different alloys of stainless steel was studied in two sampling points in a wastewater treatment plant during 4 years. The physicochemical microenvironment within the biofilms was characterized through O 2 , H 2 S and pH microelectrodes. Corrosion rates were quantified from the number, diameter and depth of pits. The results show a remarkable development of the biofilm and a significantly greater number of pits in the grit removal channel than in the sludge recirculation channel. Based on the characteristics of the water phase and microelectrode measurements, our results suggest that biofilms induced corrosion throughout 3 mechanisms: creation of differential aeration cells, areas with different pH and areas having high sulphide production which may react with metal ions.

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Nitrate stimulation of indigenous nitrate-reducing, sulfide-oxidising bacterial community in wastewater anaerobic biofilms

Cited by 79 publications

References 29 publications

GeoChip-based analysis of the microbial community functional structures in simultaneous desulfurization and denitrification process

GeoChip-based analysis of the microbial community functional structures in simultaneous desulfurization and denitrification process

The use of direct-fed microbials for mitigation of ruminant methane emissions: a review

Efecto de la biopelícula en la corrosión de aceros inoxidables

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