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

Li J, Liu J, Wang D, Chen T, Ma T, Wang Z, Zhuo W - Int J Environ Res Public Health (2015)

Bottom Line: Compared with the traditional SBR (R1), aerobic sludge granulation time was shortened 15 days in R2.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.

View Article: PubMed Central - PubMed

Affiliation: College of Biological and Environmental Engineering, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China. tanweilijun@zjut.edu.cn.

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.

No MeSH data available.


Mechanistic hypotheses to explain the acceleration of sludge granulation by adding micropowder: (a) Micropowder, EPS and filamentous bacteria respectively act as the nuclei, glue and framework for granulation; (b) Micropowder increases nuclei, organic load and shear force abruptly for starved sludge with overgrown filamentous bacteria acting as a framework to form large granules; (c) Micropowder friction restricts filamentous bacteria from extending outside and shapes granules.
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ijerph-12-10056-f006: Mechanistic hypotheses to explain the acceleration of sludge granulation by adding micropowder: (a) Micropowder, EPS and filamentous bacteria respectively act as the nuclei, glue and framework for granulation; (b) Micropowder increases nuclei, organic load and shear force abruptly for starved sludge with overgrown filamentous bacteria acting as a framework to form large granules; (c) Micropowder friction restricts filamentous bacteria from extending outside and shapes granules.

Mentions: Adding the micropowder shortens sludge granulation time because the micropowder acts as nuclei to induce microbial aggregation. Simultaneously, the EPS of the activated sludge acts as glue [21] and filamentous bacteria act as the framework (Figure 6(a)) [22]. The micropowder size, ranging from 20 to 250 µm might match that of cocci, bacillus and filamentous bacteria for aggregation.


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

Li J, Liu J, Wang D, Chen T, Ma T, Wang Z, Zhuo W - Int J Environ Res Public Health (2015)

Mechanistic hypotheses to explain the acceleration of sludge granulation by adding micropowder: (a) Micropowder, EPS and filamentous bacteria respectively act as the nuclei, glue and framework for granulation; (b) Micropowder increases nuclei, organic load and shear force abruptly for starved sludge with overgrown filamentous bacteria acting as a framework to form large granules; (c) Micropowder friction restricts filamentous bacteria from extending outside and shapes granules.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4555328&req=5

ijerph-12-10056-f006: Mechanistic hypotheses to explain the acceleration of sludge granulation by adding micropowder: (a) Micropowder, EPS and filamentous bacteria respectively act as the nuclei, glue and framework for granulation; (b) Micropowder increases nuclei, organic load and shear force abruptly for starved sludge with overgrown filamentous bacteria acting as a framework to form large granules; (c) Micropowder friction restricts filamentous bacteria from extending outside and shapes granules.
Mentions: Adding the micropowder shortens sludge granulation time because the micropowder acts as nuclei to induce microbial aggregation. Simultaneously, the EPS of the activated sludge acts as glue [21] and filamentous bacteria act as the framework (Figure 6(a)) [22]. The micropowder size, ranging from 20 to 250 µm might match that of cocci, bacillus and filamentous bacteria for aggregation.

Bottom Line: Compared with the traditional SBR (R1), aerobic sludge granulation time was shortened 15 days in R2.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.

View Article: PubMed Central - PubMed

Affiliation: College of Biological and Environmental Engineering, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China. tanweilijun@zjut.edu.cn.

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.

No MeSH data available.