The combination of external conditioning and Ca2+ addition prior to the reintroduction of effluent sludge into SBR sharply accelerates the formation of aerobic granules
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388971%3A_____%2F20%3A00541303" target="_blank" >RIV/61388971:_____/20:00541303 - isvavai.cz</a>
Výsledek na webu
<a href="https://www.sciencedirect.com/science/article/pii/S2214714420301483?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2214714420301483?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jwpe.2020.101269" target="_blank" >10.1016/j.jwpe.2020.101269</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
The combination of external conditioning and Ca2+ addition prior to the reintroduction of effluent sludge into SBR sharply accelerates the formation of aerobic granules
Popis výsledku v původním jazyce
Aerobic granular sludge (AGS) technology has been limited by its long startup time in sequencing batch reactors (SBRs). The objective of this work is to determine if a new amendment of the AGS process improves sludge granulation rate and pollutants removal efficiency. This amendment consisted in an external conditioning step during which the effluent sludge was dried, supplemented with 0.1 g CaCl2 g(-1) dried sludge (DS) and then gradually reintroduced into the SBR. Results have shown that this technique can reduce the granulation time by 17 days while ensuring the stability of AGS. Stable aerobic granules were obtained on day 20, i.e. a few days after reintroducing 1.75 g.L-1 Ca2+-conditioned sludge to the SBR for 5 consecutive days. Mixed liquor suspended solids (MLSS), sludge volume index ratio at 30 min and 5 min (SVI30/SVI5) and average granule size in the AGS reactor were maintained at 5.7 g.L-1, 1.0 and 3.5 mm, respectively. The external conditioning led to an increase in extracellular polymers (EPS) production, a decrease in moisture content, specific oxygen uptake rate (SOUR) and iron precipitation. Altogether, these impacts led to a faster aggregation of the effluent sludge compared to a control SBR. Furthermore, microbial community analyses have shown that the external conditioning process enriched specific Betaproteobacteria (e.g. Thauera genus) in aggregates and AGS. Such outcomes could be linked to the faster granulation rate and more efficient pollutants degradation.
Název v anglickém jazyce
The combination of external conditioning and Ca2+ addition prior to the reintroduction of effluent sludge into SBR sharply accelerates the formation of aerobic granules
Popis výsledku anglicky
Aerobic granular sludge (AGS) technology has been limited by its long startup time in sequencing batch reactors (SBRs). The objective of this work is to determine if a new amendment of the AGS process improves sludge granulation rate and pollutants removal efficiency. This amendment consisted in an external conditioning step during which the effluent sludge was dried, supplemented with 0.1 g CaCl2 g(-1) dried sludge (DS) and then gradually reintroduced into the SBR. Results have shown that this technique can reduce the granulation time by 17 days while ensuring the stability of AGS. Stable aerobic granules were obtained on day 20, i.e. a few days after reintroducing 1.75 g.L-1 Ca2+-conditioned sludge to the SBR for 5 consecutive days. Mixed liquor suspended solids (MLSS), sludge volume index ratio at 30 min and 5 min (SVI30/SVI5) and average granule size in the AGS reactor were maintained at 5.7 g.L-1, 1.0 and 3.5 mm, respectively. The external conditioning led to an increase in extracellular polymers (EPS) production, a decrease in moisture content, specific oxygen uptake rate (SOUR) and iron precipitation. Altogether, these impacts led to a faster aggregation of the effluent sludge compared to a control SBR. Furthermore, microbial community analyses have shown that the external conditioning process enriched specific Betaproteobacteria (e.g. Thauera genus) in aggregates and AGS. Such outcomes could be linked to the faster granulation rate and more efficient pollutants degradation.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10606 - Microbiology
Návaznosti výsledku
Projekt
—
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2020
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
J WATER PROCESS ENG
ISSN
2214-7144
e-ISSN
—
Svazek periodika
36
Číslo periodika v rámci svazku
AUG 2020
Stát vydavatele periodika
NL - Nizozemsko
Počet stran výsledku
14
Strana od-do
101269
Kód UT WoS článku
000542174000012
EID výsledku v databázi Scopus
—