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Structure Analysis of Aerobic Granule from a Sequencing Batch Reactor for Organic Matter and Ammonia Nitrogen Removal

Author

Listed:
  • Jun Li

    (College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China)

  • Ang Cai

    (College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China)

  • Danjun Wang

    (College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China)

  • Chao Chen

    (College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China)

  • Yongjiong Ni

    (College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China)

Abstract

Aerobic granules were cultivated in a sequencing batch reactor (SBR). COD and ammonia nitrogen removal rate were 94% and 99%, respectively. The diameter, settling velocity and SVI 10 of granules ranged from 2 to 5 mm, 80 to 110 m/h and about 40 mL/g, respectively. Freezing microtome images, DO concentration profiles by microelectrode, distribution of bacteria and EPS by confocal laser scanning microscopy (CLSM) show that the aerobic granules have a three-layer structure. Each layer has different thickness, character, bacteria, and DO transfer rate. A hypothesis for granule structure is proposed: the first layer, the surface of the granule, is composed mostly of heterotrophic organisms for organic matter removal, with a thickness range from 150 to 350 μm; the second layer, mostly composed of autotrophic organisms for ammonia nitrogen removal, with a thickness range from 250 to 450 μm; the third layer, located in the core of the granule, has mostly an inorganic composition and contains pores and channels.

Suggested Citation

  • Jun Li & Ang Cai & Danjun Wang & Chao Chen & Yongjiong Ni, 2014. "Structure Analysis of Aerobic Granule from a Sequencing Batch Reactor for Organic Matter and Ammonia Nitrogen Removal," IJERPH, MDPI, vol. 11(3), pages 1-10, February.
    • Handle: RePEc:gam:jijerp:v:11:y:2014:i:3:p:2427-2436:d:33401
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