Stirring-based control strategy for microaerobic H2S removal in sequencing batch anaerobic digesters

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22320%2F21%3A43923169" target="_blank" >RIV/60461373:22320/21:43923169 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0016236121015775" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0016236121015775</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.fuel.2021.121696" target="_blank" >10.1016/j.fuel.2021.121696</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Stirring-based control strategy for microaerobic H2S removal in sequencing batch anaerobic digesters

Popis výsledku v původním jazyce

Microaeration in fermenters is challenging due to the rapid increase of H2S concentration upon the start of stirring, which makes biogas utilization less attractive. On these occasions, apparent H2S production exceeds the ability of sulfur-oxidizing bacteria (SOB) to remove H2S, which results in peak H2S concentrations in biogas. This study shows that such peaks can be reduced by stirring optimization. For the first time, the effect of the stirring intensity on microaeration was evaluated in a lab-scale sequencing batch reactor and supported by a biokinetic mathematical model. Single stirring intensity (15, 25, 35, and 55 RPM) and gradually increasing stirring intensity (15 to 35 RPM) were compared. Despite achieving a stably low concentration of H2S in the fermenter at low stirring speed, the accumulation of volatile fatty acids in liquid occurred. However, with gradually increasing stirring intensity, slower stirring at the beginning of the cycle led to the slower release of H2S, thereby, winning more time for SOB to remove H2S from biogas. H2S peaks were reduced by this strategy and no accumulation of volatile fatty acids in the liquid phase was observed. Since microaeration is zero-waste chemical-free desulfurization method, its optimization and H2S peaks reduction can help to expand its use.

Název v anglickém jazyce

Stirring-based control strategy for microaerobic H2S removal in sequencing batch anaerobic digesters

Popis výsledku anglicky

Microaeration in fermenters is challenging due to the rapid increase of H2S concentration upon the start of stirring, which makes biogas utilization less attractive. On these occasions, apparent H2S production exceeds the ability of sulfur-oxidizing bacteria (SOB) to remove H2S, which results in peak H2S concentrations in biogas. This study shows that such peaks can be reduced by stirring optimization. For the first time, the effect of the stirring intensity on microaeration was evaluated in a lab-scale sequencing batch reactor and supported by a biokinetic mathematical model. Single stirring intensity (15, 25, 35, and 55 RPM) and gradually increasing stirring intensity (15 to 35 RPM) were compared. Despite achieving a stably low concentration of H2S in the fermenter at low stirring speed, the accumulation of volatile fatty acids in liquid occurred. However, with gradually increasing stirring intensity, slower stirring at the beginning of the cycle led to the slower release of H2S, thereby, winning more time for SOB to remove H2S from biogas. H2S peaks were reduced by this strategy and no accumulation of volatile fatty acids in the liquid phase was observed. Since microaeration is zero-waste chemical-free desulfurization method, its optimization and H2S peaks reduction can help to expand its use.

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

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OECD FORD obor

20801 - Environmental biotechnology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Fuel

ISSN

0016-2361

e-ISSN

—

Svazek periodika

306

Číslo periodika v rámci svazku

121696

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

"Nestránkováno"

Kód UT WoS článku

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EID výsledku v databázi Scopus

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