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Int. J. Environ. Res. Public Health 2015, 12(8), 10056-10065; doi:10.3390/ijerph120810056

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

1
College of Biological and Environmental Engineering, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China
2
College of Civil Engineering and Architecture, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China
3
Zhejiang Zone King Engineering Technology Co. Ltd., 14B, Hangzhou 310000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Miklas Scholz
Received: 2 July 2015 / Revised: 4 August 2015 / Accepted: 10 August 2015 / Published: 21 August 2015
View Full-Text   |   Download PDF [290 KB, uploaded 21 August 2015]   |  

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. View Full-Text
Keywords: aerobic granulation; granule; filamentous bacteria; micropowder; dry sewage sludge aerobic granulation; granule; filamentous bacteria; micropowder; dry sewage sludge
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, J.; Liu, J.; Wang, D.; Chen, T.; Ma, T.; Wang, Z.; Zhuo, W. Accelerating Aerobic Sludge Granulation by Adding Dry Sewage Sludge Micropowder in Sequencing Batch Reactors. Int. J. Environ. Res. Public Health 2015, 12, 10056-10065.

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