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• W3023888051 endingPage "126952" @default.
• W3023888051 startingPage "126952" @default.
• W3023888051 abstract "The adjustment of hydraulic retention time (HRT) and the supplement of titanium(III) nitrilotriacetate (Ti(III)-NTA) as a reducing agent were implemented in an anaerobic downflow hanging sponge (DHS) reactor with the aims to (i) improve nitrogen removal performance and to (ii) eliminate N2O emission. A laboratory-scale DHS reactor was operated at 35 °C, under autotrophic denitrification conditions with methane gas (14.2 L d-1) as the main carbon source, NaNO3 and NaNO2 (20 mg N L-1 per compound) as nitrogen sources. The sufficient HRT for simultaneously removing nitrate and nitrite in this reactor was found at 12 h when HRT was reduced from 24 to 6 h. Then at the HRT of 12 h, the addition of Ti(III)-NTA at a final concentration of 25 μM Ti(III) boosted the reactor's nitrogen removal rates from 1.4 ± 0.6 to 4.1 ± 1.9 g NO3--N m-3 d-1 and 3.2 ± 2.8 to 6.6 ± 3.3 g NO2--N m-3 d-1. Furthermore, this study is the first to consider the N2O emission in a continuous reactor applying denitrification coupled to anaerobic methane oxidation (DAMO) process. Produced N2O in this DHS reactor was from 10.6 × 10-4% to 89.0 × 10-4% of removed NOx- without Ti(III)-NTA and from 0.7 × 10-4% to 61.4 × 10-4% of removed NOx- with Ti(III)-NTA. Overall, these findings suggested the advantage of Ti(III)-NTA as an oxygen scavenger for denitrification processes and the potential of the anaerobic DHS reactor for facilitating the DAMO processes and mitigating N2O gas." @default.
• W3023888051 created "2020-05-13" @default.
• W3023888051 creator A5039972142 @default.
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• W3023888051 date "2020-10-01" @default.
• W3023888051 modified "2023-10-18" @default.
• W3023888051 title "Positive impact of a reducing agent on autotrophic nitrogen removal process and nexus of nitrous oxide emission in an anaerobic downflow hanging sponge reactor" @default.
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• W3023888051 doi "https://doi.org/10.1016/j.chemosphere.2020.126952" @default.
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