Sulfur-based autotrophic denitrification of drinking water using a membrane bioreactor

Şahinkaya, Erkan; Yurtsever, Adem; Aktaş, Özgür; Uçar, Deniz; Wang, Zhiwei

doi:10.1016/j.cej.2015.01.045

Cited by 115 publications

(22 citation statements)

References 34 publications

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“…Pressurized gases flow through the membrane lumen and diffuse through the internal wall to a biofilm formed on the membrane external surface. Unlike membranes used in S 0 -based membrane bioreactors (MBRs) [67,68], no filtering is performed. Since the gas permeates the membrane in the opposite direction than water dissolved compounds, counter-gradients are established and gas use efficiency improved.…”

Section: Membrane Biofilm Reactor (Mbfr)mentioning

confidence: 99%

Chemolithotrophic denitrification in biofilm reactors

Capua

Papirio

Lens

et al. 2015

Chemical Engineering Journal

170

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Section: Membrane Biofilm Reactor (Mbfr)mentioning

confidence: 99%

Chemolithotrophic denitrification in biofilm reactors

Capua

Papirio

Lens

et al. 2015

Chemical Engineering Journal

170

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“…To overcome these problems, bioreactors utilizing inorganic electron donors such as H2 [15], iron [16] or elemental sulfur [17][18][19] have been proposed. In sulfur based denitrification process, elemental sulfur serves as the inorganic electron donor (Eq.2).…”

Section: Introductionmentioning

confidence: 99%

Heterotrophic–autotrophic sequential system for reductive nitrate and perchlorate removal

Uçar

Çokgör

Şahinkaya

2015

Environmental Technology

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Nitrate and perchlorate were identified as significant water contaminants all over the world. This study aims at evaluating the performances of the heterotrophic-autotrophic sequential denitrification process for reductive nitrate and perchlorate removal from drinking water. The reduced nitrate concentration in the heterotrophic reactor increased with increasing methanol concentrations and the remaining nitrate/nitrite was further removed in the following autotrophic denitrifying process. The performances of the sequential process were studied under varying nitrate loads of [Formula: see text] at a fixed hydraulic retention time of 2 h. The C/N ratio in the heterotrophic reactor varied between 1.24 and 2.77 throughout the study. Nitrate and perchlorate reduced completely with maximum initial concentrations of [Formula: see text] and 1000 µg/L, respectively. The maximum denitrification rate for the heterotrophic reactor was [Formula: see text] when the bioreactor was fed with [Formula: see text] and 277 mg/L methanol. For the autotrophic reactor, the highest denitrification rate was [Formula: see text] in the first period when the heterotrophic reactor performance was low. Perchlorate reduction was initiated in the heterotrophic reactor, but completed in the following autotrophic process. Effluent sulphate concentration was below the drinking water standard level of 250 mg/L and pH was in the neutral level.

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“…Past S 0 ‐based denitrification studies show that NO 2 − typically accumulates to high levels during denitrification. NO 2 − is reduced only when NO 3 − had been significantly or fully reduced (Kimura, Nakamura, & Watanabe, ; Sahinkaya, Yurtsever, Aktas, Ucar, & Wang, ; Sierra‐Alvarez et al, ; Simard et al, ; Soares, ; Sun & Nemati, ). Sierra‐Alvarez et al () found that the maximum specific rate of NO 3 − reduction was higher than the maximum rate of NO 2 − reduction in batch experiments.…”

Section: Discussionmentioning

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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Sulfur-based autotrophic denitrification of drinking water using a membrane bioreactor

Cited by 115 publications

References 34 publications

Chemolithotrophic denitrification in biofilm reactors

Chemolithotrophic denitrification in biofilm reactors

Heterotrophic–autotrophic sequential system for reductive nitrate and perchlorate removal

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

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