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The role of microbial diversity and composition in minimizing sludge production in the oxic-settling-anoxic process

Journal Article


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Abstract


  • The oxic-settling-anoxic (OSA) process, which involves an aerobic tank attached to oxygen- and substratedeficient

    external anoxic reactors, minimizes sludge production in biological wastewater treatment. In this

    study, the microbial community structure of OSA was determined. Principal coordinate analysis showed that

    among the three operational factors, i.e., (i) redox condition, (ii) external reactor sludge retention time (SRText),

    and (iii) sludge interchange between aerobic and anoxic reactors, redox condition had the greatest impact onmicrobial

    diversity.Generally, reactorswith lower oxidation-reduction potential had highermicrobial diversity. The

    main aerobic sequencing batch reactor of OSA (SBROSA) that interchanged sludgewith an external anoxic reactor

    had greater microbial diversity than SBRcontrol which did not have sludge interchange. SBROSA sustained high

    abundance of the slow-growing nitrifying bacteria (e.g., Nitrospirales and Nitrosomondales) and consequently exhibited

    reduced sludge yield. Specific groups of bacteria facilitated sludge autolysis in the external reactors. Hydrolyzing

    (e.g., Bacteroidetes and Chloroflexi) and fermentative (e.g., Firmicutes) bacteria, which can break down

    cellularmatter, proliferated in both the external aerobic/anoxic and anoxic reactors. Sludge autolysis in the anoxic

    reactor was enhanced with the increase of predatory bacteria (e.g., order Myxobacteriales and genus

    Bdellovibrio) that can contribute to biomass decay. Furthermore, β- and γ-Proteobacteria were identified as the

    bacterial phyla that primarily underwent decay in the external reactors.

Publication Date


  • 2017

Citation


  • Semblante, G. U., Phan, H. V., Hai, F. I., Xu, Z., Price, W. E. & Nghiem, L. D. (2017). The role of microbial diversity and composition in minimizing sludge production in the oxic-settling-anoxic process. Science of the Total Environment, 607-608 558-567.

Scopus Eid


  • 2-s2.0-85021891804

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=3016&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/2012

Has Global Citation Frequency


Number Of Pages


  • 9

Start Page


  • 558

End Page


  • 567

Volume


  • 607-608

Place Of Publication


  • Netherlands

Abstract


  • The oxic-settling-anoxic (OSA) process, which involves an aerobic tank attached to oxygen- and substratedeficient

    external anoxic reactors, minimizes sludge production in biological wastewater treatment. In this

    study, the microbial community structure of OSA was determined. Principal coordinate analysis showed that

    among the three operational factors, i.e., (i) redox condition, (ii) external reactor sludge retention time (SRText),

    and (iii) sludge interchange between aerobic and anoxic reactors, redox condition had the greatest impact onmicrobial

    diversity.Generally, reactorswith lower oxidation-reduction potential had highermicrobial diversity. The

    main aerobic sequencing batch reactor of OSA (SBROSA) that interchanged sludgewith an external anoxic reactor

    had greater microbial diversity than SBRcontrol which did not have sludge interchange. SBROSA sustained high

    abundance of the slow-growing nitrifying bacteria (e.g., Nitrospirales and Nitrosomondales) and consequently exhibited

    reduced sludge yield. Specific groups of bacteria facilitated sludge autolysis in the external reactors. Hydrolyzing

    (e.g., Bacteroidetes and Chloroflexi) and fermentative (e.g., Firmicutes) bacteria, which can break down

    cellularmatter, proliferated in both the external aerobic/anoxic and anoxic reactors. Sludge autolysis in the anoxic

    reactor was enhanced with the increase of predatory bacteria (e.g., order Myxobacteriales and genus

    Bdellovibrio) that can contribute to biomass decay. Furthermore, β- and γ-Proteobacteria were identified as the

    bacterial phyla that primarily underwent decay in the external reactors.

Publication Date


  • 2017

Citation


  • Semblante, G. U., Phan, H. V., Hai, F. I., Xu, Z., Price, W. E. & Nghiem, L. D. (2017). The role of microbial diversity and composition in minimizing sludge production in the oxic-settling-anoxic process. Science of the Total Environment, 607-608 558-567.

Scopus Eid


  • 2-s2.0-85021891804

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=3016&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/2012

Has Global Citation Frequency


Number Of Pages


  • 9

Start Page


  • 558

End Page


  • 567

Volume


  • 607-608

Place Of Publication


  • Netherlands