Effects of attached and suspended biomass on the dynamics of the microbial community and wastewater characteristics in sewers

Tadashi Shoji, Hiroyasu Satoh, Yoshiharu Matsubara, Satoshi Tamaki, Katsuo Matsuzaka, Takashi Mino, Wataru Suda, Masahira Hattori

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    Abstract

    Various transformations in wastewater quality along sewers, such as that due to self-purification, have been reported. However, little is known about the contributions of the attached (sewer-wall) and suspended biomass originally existing in wastewater due to a lack of experimental fields. In this study, we examined the effects of attached and suspended biomass on the dynamics of the microbial communities in sewers by conducting recirculating batch tests in a pilot-scale sewer system equipped with sponge media and a lab-scale aerating batch test, respectively. The changes in the quantity and quality of organic matter indicated that the contribution of the attached biomass to self-purification was much larger than that of the suspended biomass, because the former was sufficiently acclimated to the wastewater. Moreover, the microbial community analysis by pyrosequencing suggested that there were two candidates responsible for self-purification: 1) Comamonadaceae and Rhodocyclaceae, which could immediately proliferate under attached conditions and become dominant (15% each) in the attached biomass, and 2) Pseudomonadaceae, which could proliferate under suspended conditions after a lag period of several hours and remain a small component (4%) of the attached biomass.

    Original languageEnglish
    Pages (from-to)233-244
    Number of pages12
    JournalJournal of Water and Environment Technology
    Volume16
    Issue number6
    DOIs
    Publication statusPublished - 2018 Jan 1

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    Keywords

    • Attached biomass
    • Organic matter
    • Self-purification
    • Sewer
    • Suspended biomass

    ASJC Scopus subject areas

    • Environmental Engineering
    • Ecological Modelling
    • Water Science and Technology
    • Waste Management and Disposal
    • Pollution
    • Health, Toxicology and Mutagenesis

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