Optimization of nitrate and selenate reduction in an ethanol-fed fluidized bed reactor via redox potential feedback control
Copyright © 2020 Elsevier B.V. All rights reserved..
Electron donors are a major cost-factor in biological removal of oxyanions, such as nitrate and selenate from wastewater. In this study, an online ethanol dosing strategy based on feedback control of oxidation-reduction potential (ORP) was designed to optimize the performance of a lab-scale fluidized bed reactor (FBR) in treating selenate and nitrate (5 mM each) containing wastewater. The FBR performance was evaluated at various ORP setpoints ranging between -520 mV and -240 mV (vs. Ag/AgCl). Results suggested that both nitrate and selenate were completely removed at ORPs between -520 mV and -360 mV, with methylseleninic acid, selenocyanate, selenosulfate and ammonia being produced at low ORPs between -520 mV and -480 mV, likely due to overdosing of ethanol. At ORPs between -300 mV and -240 mV, limited ethanol dosing resulted in an apparent decline in selenate removal whereas nitrate removal remained stable. Resuming the ORP to -520 mV successfully restored complete selenate reduction. An optimal ORP of -400 mV was identified for the FBR, whereby selenate and nitrate were nearly completely removed with a minimal ethanol consumption. Overall, controlling ORP via feedback-dosing of the electron donor was an effective strategy to optimize FBR performance for reducing selenate and nitrate in wastewater.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2021 |
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| Erschienen: |
2021 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:402 |
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| Enthalten in: |
Journal of hazardous materials - 402(2021) vom: 15. Jan., Seite 123770 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Yan, Su [VerfasserIn] |
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| Links: |
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| Themen: |
3K9958V90M |
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| Anmerkungen: |
Date Completed 14.05.2021 Date Revised 14.05.2021 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.jhazmat.2020.123770 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM318211459 |
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| 245 | 1 | 0 | |a Optimization of nitrate and selenate reduction in an ethanol-fed fluidized bed reactor via redox potential feedback control |
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| 500 | |a Date Revised 14.05.2021 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a Copyright © 2020 Elsevier B.V. All rights reserved. | ||
| 520 | |a Electron donors are a major cost-factor in biological removal of oxyanions, such as nitrate and selenate from wastewater. In this study, an online ethanol dosing strategy based on feedback control of oxidation-reduction potential (ORP) was designed to optimize the performance of a lab-scale fluidized bed reactor (FBR) in treating selenate and nitrate (5 mM each) containing wastewater. The FBR performance was evaluated at various ORP setpoints ranging between -520 mV and -240 mV (vs. Ag/AgCl). Results suggested that both nitrate and selenate were completely removed at ORPs between -520 mV and -360 mV, with methylseleninic acid, selenocyanate, selenosulfate and ammonia being produced at low ORPs between -520 mV and -480 mV, likely due to overdosing of ethanol. At ORPs between -300 mV and -240 mV, limited ethanol dosing resulted in an apparent decline in selenate removal whereas nitrate removal remained stable. Resuming the ORP to -520 mV successfully restored complete selenate reduction. An optimal ORP of -400 mV was identified for the FBR, whereby selenate and nitrate were nearly completely removed with a minimal ethanol consumption. Overall, controlling ORP via feedback-dosing of the electron donor was an effective strategy to optimize FBR performance for reducing selenate and nitrate in wastewater | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Bioreactor | |
| 650 | 4 | |a Electron donor | |
| 650 | 4 | |a Oxidation-reduction potential | |
| 650 | 4 | |a Oxyanion | |
| 650 | 4 | |a Wastewater treatment | |
| 650 | 7 | |a Nitrates |2 NLM | |
| 650 | 7 | |a Ethanol |2 NLM | |
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| 650 | 7 | |a Selenic Acid |2 NLM | |
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| 700 | 1 | |a Cheng, Ka Yu |e verfasserin |4 aut | |
| 700 | 1 | |a Ginige, Maneesha P |e verfasserin |4 aut | |
| 700 | 1 | |a Zheng, Guanyu |e verfasserin |4 aut | |
| 700 | 1 | |a Zhou, Lixiang |e verfasserin |4 aut | |
| 700 | 1 | |a Kaksonen, Anna H |e verfasserin |4 aut | |
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