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

Jun Li, Ang Cai, Danjun Wang, Chao Chen and Yongjiong Ni
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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

IJERPH, 2014, vol. 11, issue 3, 1-10

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 ?m; the second layer, mostly composed of autotrophic organisms for ammonia nitrogen removal, with a thickness range from 250 to 450 ?m; the third layer, located in the core of the granule, has mostly an inorganic composition and contains pores and channels.

Keywords: aerobic granules; structure; freezing microtome; dissolved oxygen; microelectrode; CLSM (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2014
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