Fast Granulation by Combining External Sludge Conditioning with FeCl3 Addition and Reintroducing into an SBR
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388971%3A_____%2F22%3A00561364" target="_blank" >RIV/61388971:_____/22:00561364 - isvavai.cz</a>
Result on the web
<a href="https://www.mdpi.com/2073-4360/14/17/3688" target="_blank" >https://www.mdpi.com/2073-4360/14/17/3688</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/polym14173688" target="_blank" >10.3390/polym14173688</a>
Alternative languages
Result language
angličtina
Original language name
Fast Granulation by Combining External Sludge Conditioning with FeCl3 Addition and Reintroducing into an SBR
Original language description
The separation of light and heavy sludge, as well as the aggregation rate of floccular sludge, are two critical aspects of the rapid granulation process in sequencing batch reactors (SBRs) in the early stages. In this study, we investigated the impact of a method to improve both sludge separation and granulation by coupling effluent sludge external conditioning with FeCl3 addition and then reintroducing it into the SBR. By supplementation with 0.1 g Fe3+ (g dried sludge (DS))(-1), the concentration of extracellular polymeric substances (EPS) and sludge retention efficiency greatly increased, whereas the moisture content and specific oxygen uptake rate (SOUR) sharply decreased within 24 h external conditioning. Aggregates (1.75 +/- 0.05 g center dot L-1) were reintroduced into the bioreactor once daily from day 13 to day 15. Afterwards, on day 17, aerobic granules with a concentration of mixed liquor suspended solids (MLSS) of 5.636 g/L, a sludge volume index (SVI30) of 45.5 mL/g and an average size of 2.5 mm in diameter were obtained. These results suggest that the external conditioning step with both air-drying and the addition of Fe3+ enhanced the production of EPS in the effluent sludge and improved rapid aggregation and high sludge retention efficiency. Consequently, the reintroduced aggregates with good traits shortened the time required to obtain mature aerobic granular sludge (AGS) and properly separate light and heavy sludge. Indeed, this method jump-started the aggregation, and rapid granulation processes were successful in this work. Additionally, while the removal efficiency of chemical oxygen demand (COD) and nitrogen from ammonium (NH4+-N) decreased when reintroducing the treated sludge into the SBR, such properties increased again as the AGS matured in the SBR, up to removal efficiencies of 96% and 95%, respectively.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10606 - Microbiology
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Polymers
ISSN
2073-4360
e-ISSN
2073-4360
Volume of the periodical
14
Issue of the periodical within the volume
17
Country of publishing house
CH - SWITZERLAND
Number of pages
14
Pages from-to
3688
UT code for WoS article
000851938600001
EID of the result in the Scopus database
2-s2.0-85137803993