Electron donors for autotrophic denitrification

Capua, Francesco Di; Pirozzi, Francesco; Lens, Piet N.L.; Esposito, Giovanni

doi:10.1016/j.cej.2019.01.069

Cited by 367 publications

(98 citation statements)

References 178 publications

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“…Although a high nitrogen removal rate can be achieved through heterotrophic denitrification, a posttreatment of the effluent is required to deal with the excess of organic carbon, which was supplied as electron donor and energy source 15) . For autotrophic denitrification, an electron donor is required in the form of sulfur compounds, ferrous iron, arsenite, manganese, or H2 gas 16) , together with inorganic carbon. CO2 gas and HCO3…”

Section: No3mentioning

confidence: 99%

Effect of Bicarbonate on the Performance of Hydrogen-based Denitrification at Different Hydraulic Retention Times

Rujakom

Shinoda

Singhopon

et al. 2020

Japanese J. Wat. Treat. Biol.

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Bicarbonate (HCO 3-) can be used as an inorganic carbon source for hydrogen-based denitrification (HD). Since HCO3is considered to accelerate the NO2reduction rate, this study is attempted to minimize the hydraulic retention time (HRT) of HD systems using varied amounts of HCO3-: deficient, moderate, and abundant amounts. The results implied that a low NO2amount was removed at unsuitably short HRTs, resulting in poor HD efficiency despite being supplemented with abundant HCO3amounts. HCO3assisted in rapidly acclimatizing the bacteria having nirS gene, causing higher NO2reduction rate and aided in changing the bacterial communities. Thauera spp. were the most dominant bacteria in abundant HCO3conditions, achieving high HD efficiency at 8 to 24 h HRT whereas satisfactory efficiency was achieved in the deficient and moderate HCO3amountsystems through the collaboration of Rhodocyclaceae, Alcaligenaceae, and Xanthomonadaceae as predominant bacteria in the community. A strong correlation between the abundance of nirS gene and Thauera spp. was also found. The findings in this study revealed the importance of using HCO3for the enrichment of H2-oxidizing denitrifiers containing nirS gene in order to reduce NO2accumulation to enhance the HD efficiency.

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Section: No3mentioning

confidence: 99%

Effect of Bicarbonate on the Performance of Hydrogen-based Denitrification at Different Hydraulic Retention Times

Rujakom

Shinoda

Singhopon

et al. 2020

Japanese J. Wat. Treat. Biol.

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“…The denitrification rate depends on several factors such as temperature, the concentration of NO 3 present in the media, organic carbon, the presence of oxygen and the density of denitrifying bacteria (Conthe et al 2019). Also, this NO 3 removal method is more economical and environmentally friendly than physicochemical processes such as ion exchange, adsorption and reverse osmosis, since these require chemical products and consume energy (Di Capua et al 2019).…”

Section: Denitrificationmentioning

confidence: 99%

The nitrification process for nitrogen removal in biofloc system aquaculture

Robles‐Porchas

Gollas‐Galván

Martínez‐Porchas

et al. 2020

Reviews in Aquaculture

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Aquaculture is an economic activity that faces the unavoidable problem of water quality detriment, which is mainly generated by the improper management of production ponds, including inadequate water circulation and aeration, accumulation of undigested food residues, excretion of metabolic by‐products by the cultivated organisms and other. In addition, the increase in suspended organic matter together with the presence and generation of nitrogen compounds can severely affect the physiology of the animal, leading to significant losses in production. Ammonia (NH3), nitrite (NO2) and nitrate (NO3) are toxic in different scales and environmental conditions; therefore, reducing their concentrations in the culture units has paramount relevance. In this regard, bioflocs are an efficient alternative to transform nitrogen compounds into a non‐toxic form, taking advantage of the capabilities of the microbial communities conforming them. Also, nitrogen can be harnessed and incorporated as organic nitrogen, making the biofloc a source of useful natural food for the cultivated organism. The substantial reduction in the rate of water exchange favoured by the biofloc technology (BFT) is a beneficial advantage for both the production systems and the environment, diminishing the risk of introducing pathogens into the pond in parallel with the improvement in the water quality of effluents. Ammonia oxidation is an advantage adding value to the BFT systems and is discussed in this review.

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“…Although organic electron donors are commonly used, most are expensive and have special handling concerns, high biomass yields, and large carbon footprints (Zhu & Getting, ). Inorganic electron donors, such as hydrogen gas, metal oxides, and reduced sulfur compounds, have been drawing increasing attention (Ashok & Hait, ; Di Capua, Lakaniemi, Puhakka, Lens, & Esposito, ; Di Capua, Papirio, Lens, & Esposito, ; Di Capua, Pirozzi, Lens, & Esposito, ; Nerenberg, Rittmann, & Najm, ; Sabba et al, ; Shao, Zhang, & Fang, ; Wang, Bott, & Nerenberg, ). Among these, elemental sulfur (S 0 ) may provide a cost‐effective and sustainable alternative (Wang et al, ).…”

Section: Introductionmentioning

confidence: 99%

Using kinetics and modeling to predict denitrification fluxes in elemental‐sulfur‐based biofilms

Wang

Sabba

Bott

et al. 2019

Biotech & Bioengineering

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Elemental sulfur (S 0 ) can serve as an electron donor for water and wastewater denitrification, but few researchers have addressed the kinetics of S 0 -based reduction of nitrate (NO 3 − ), nitrite (NO 2 − ), and nitrous oxide (N 2 O). In addition, S 0based denitrifying biofilms are counter-diffusional. This is because the electron donor (S 0 ) is supplied from the biofilm attachment surface while the acceptor, for example, NO 3 − , is supplied from the bulk liquid. No existing mathematical model for S 0 -based denitrification considers this behavior. In this study, batch tests were used to determine the kinetic parameters for the reduction of NO 3 − , NO 2 − , and N 2 O.Additionally, a biofilm model was developed to explore the effects of counterdiffusion on overall fluxes, that is, the mass of NO 3 − or NO 2 − removed per unit biofilm support area per unit time. The maximum specific substrate utilization rates (q) for NO 3 − , NO 2 − , and N 2 O were 3.54, 1.98, and 6.28 g N g COD −1 ·d −1 , respectively. The maximum specific growth rates (μ) were 0.71, 1.21, and 1.67 d −1 for NO 3 − to NO 2 − , NO 2 − to N 2 O, and N 2 O to N 2 , respectively. Results suggest that the observed NO 2 − accumulation during S 0 -based denitrification results from a lowq for NO 2 − relative to that for NO 3 − . The highq for N 2 O, relative to that for NO 3 − and NO 2 − , suggest that little N 2 O accumulation occurs during denitrification. A counter-diffusional biofilm model was used to predict trends for NO 3 − fluxes, and confirmed NO 2 − accumulation in S 0 -based denitrification biofilms. It also explains the observed detrimental effects of biofilm thickness on denitrification fluxes. This study allows a more accurate prediction of NO 3 − , NO 2 − , and N 2 O transformations in S 0 -based denitrification.

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Electron donors for autotrophic denitrification

Cited by 367 publications

References 178 publications

Effect of Bicarbonate on the Performance of Hydrogen-based Denitrification at Different Hydraulic Retention Times

Effect of Bicarbonate on the Performance of Hydrogen-based Denitrification at Different Hydraulic Retention Times

The nitrification process for nitrogen removal in biofloc system aquaculture

Using kinetics and modeling to predict denitrification fluxes in elemental‐sulfur‐based biofilms

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