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• W2949369430 endingPage "2709" @default.
• W2949369430 startingPage "2698" @default.
• W2949369430 abstract "Elemental sulfur (S0 ) 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 0 -based 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 counter-diffusion 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 ( qˆ ) 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 ( µˆ ) 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 low qˆ for NO 2- relative to that for NO 3- . The high qˆ 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." @default.
• W2949369430 created "2019-06-27" @default.
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• W2949369430 date "2019-07-12" @default.
• W2949369430 modified "2023-09-26" @default.
• W2949369430 title "Using kinetics and modeling to predict denitrification fluxes in elemental‐sulfur‐based biofilms" @default.
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• W2949369430 doi "https://doi.org/10.1002/bit.27094" @default.
• W2949369430 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31225637" @default.
• W2949369430 hasPublicationYear "2019" @default.
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