Accelerating Aerobic Sludge Granulation by Adding Dry Sewage Sludge Micropowder in Sequencing Batch Reactors

Jun Li, Jun Liu, Danjun Wang, Tao Chen, Ting Ma, Zhihong Wang and Weilong Zhuo
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Jun Li: College of Biological and Environmental Engineering, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China
Jun Liu: College of Biological and Environmental Engineering, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China
Danjun Wang: College of Civil Engineering and Architecture, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China
Tao Chen: College of Civil Engineering and Architecture, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China
Ting Ma: College of Civil Engineering and Architecture, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China
Zhihong Wang: Zhejiang Zone King Engineering Technology Co. Ltd., 14B, Hangzhou 310000, China
Weilong Zhuo: Zhejiang Zone King Engineering Technology Co. Ltd., 14B, Hangzhou 310000, China

IJERPH, 2015, vol. 12, issue 8, 1-10

Abstract: Micropowder (20–250 µm) made from ground dry waste sludge from a municipal sewage treatment plant was added in a sequencing batch reactor (R2), which was fed by synthetic wastewater with acetate as carbon source. Compared with the traditional SBR (R1), aerobic sludge granulation time was shortened 15 days in R2. Furthermore, filamentous bacteria in bulking sludge were controlled to accelerate aerobic granulation and form large granules. Correspondingly, the SVI decreased from 225 mL/g to 37 mL/g. X-ray Fluorescence (XRF) analysis demonstrated that Al and Si from the micropowder were accumulated in granules. A mechanism hypotheses for the acceleration of aerobic granulation by adding dry sludge micropowder is proposed: added micropowder acts as nuclei to induce bacterial attachment; dissolved matters from the micropowder increase abruptly the organic load for starved sludge to control overgrown filamentous bacteria as a framework for aggregation; increased friction from the movement of micropowder forces the filaments which extend outwards to shrink for shaping granules.

Keywords: aerobic granulation; granule; filamentous bacteria; micropowder; dry sewage sludge (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2015
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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