1 Ocak 2022 Dergi makalesi Açık Erişim

Demirkaya, Esma; Ciftcioglu, Bengisu; Ozyildiz, Goksin; Zengin, Gulsum Emel; Pala-Ozkok, Ilke; Cokgor, Emine; Tas, Didem Okutman

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    <subfield code="a">Comprehensive evaluation of starter culture impact on the bioreactor performance and microbial kinetics</subfield>
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    <subfield code="a">The present study investigated the disregarded impact of microbial community composition, diversity and abundance of the starter biomass on lab-scale bioreactor performance, steady-state long time operation, biodegradation outcome and microbial kinetics. Standard lab-scale experiments are usually initiated with inoculum taken from wastewater treatment plants (WWTPs) without considering microbial community composition. Two identical sequencing batch bioreactors (SBR-1, SBR-2) were operated with inocula obtained from two domestic WWTPs to assess the role of inoculum composition on reactor performance and treatment efficacy. Filamentous microorganisms were dominated in SBR-1 (SVI: 265 mL/g), whereas their supremacy was diminished in SBR-2 (SVI: 160 mL/g). Next generation sequencing analyses verified high abundance of Candidatus Microthrix (14%) and Kouleothrix spp. (3%) in SBR-1. Although Chloroflexi C10-SB1A metagenome accounted for 16% of WWTP-2 community, SBR-2 was operated at steady-state for longer period without deterioration. Statistical indicators based on molecular studies showed that WWTP-2 has higher diversity than WWTP-1. Higher biodiversity in WWTP-2 community supported the stable process performance. Modelling studies denoted an increase in half saturation coefficients (K-s) in filamentous microorganisms dominated reactor. The results of this study provide insight on how the filamentous organisms typically found in WWTPs become a fundamental constituent during the bioreactor operation.</subfield>
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    <subfield code="u">Gebze Tech Univ, Environm Engn Dept, TR-41400 Gebze, Turkey</subfield>
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    <subfield code="a">10.1016/j.bej.2021.108233</subfield>
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