The r/K selection theory and its application in biological wastewater treatment processes

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dc.contributor.authorYin, Qidongen
dc.contributor.authorSun, Yuepengen
dc.contributor.authorLi, Boen
dc.contributor.authorFeng, Zhaoluen
dc.contributor.authorWu, Guangxueen
dc.date.accessioned2022-12-08T15:22:40Zen
dc.date.available2022-12-08T15:22:40Zen
dc.date.issued2022-06-10en
dc.description.abstractUnderstanding the characteristics of functional organisms is the key to managing and updating biological processes for wastewater treatment. This review, for the first time, systematically characterized two typical types of strategists in wastewater treatment ecosystems via the r/K selection theory and provided novel strategies for selectively enriching microbial community. Functional organisms involved in nitrification (e.g., Nitrosomonas and Nitrosococcus), anammox (Candidatus Brocadia), and methanogenesis (Methanosarcinaceae) are identified as r-strategists with fast growth capacities and low substrate affinities. These r-strategists can achieve high pollutant removal loading rates. On the other hand, other organisms such as Nitrosospira spp., Candidatus Kuenenia, and Methanosaetaceae, are characterized as K-strategists with slow growth rates but high substrate affinities, which can decrease the pollutant concentration to low levels. More importantly, K-strategists may play crucial roles in the biodegradation of recalcitrant organic pollutants. The food-to-microorganism ratio, mass transfer, cell size, and biomass morphology are the key factors determining the selection of r-/K-strategists. These factors can be related with operating parameters (e.g., solids and hydraulic retention time), biomass morphology (biofilm or granules), and operating modes (continuous-flow or sequencing batch), etc., to achieve the efficient acclimation of targeted r-/K-strategists. For practical applications, the concept of substrate flux was put forward to further benefit the selective enrichment of r-/K-strategists, fulfilling effective management and improvement of engineered pollution control bioprocesses. Finally, the future perspectives regarding the development of the r/K selection theory in wastewater treatment processes were discussed.en
dc.description.notesThis study was supported by the Galway University Foundation (G. W.).en
dc.description.sponsorshipGalway University Foundationen
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1016/j.scitotenv.2022.153836en
dc.identifier.eissn1879-1026en
dc.identifier.issn0048-9697en
dc.identifier.other153836en
dc.identifier.pmid35176382en
dc.identifier.urihttp://hdl.handle.net/10919/112815en
dc.identifier.volume824en
dc.language.isoenen
dc.publisherElsevieren
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectBiological processesen
dc.subjectr-/K-strategistsen
dc.subjectSelective enrichmenten
dc.subjectSubstrate fluxen
dc.subjectWastewater treatmenten
dc.titleThe r/K selection theory and its application in biological wastewater treatment processesen
dc.title.serialScience of the Total Environmenten
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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