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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.


Elemental analysis of micropowder and granules by XRF, G1 and G2 respectively represent granules from R1 (no addition of micropowder) and R2 (adding micropowder) on day 24.
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ijerph-12-10056-f003: Elemental analysis of micropowder and granules by XRF, G1 and G2 respectively represent granules from R1 (no addition of micropowder) and R2 (adding micropowder) on day 24.

Mentions: The elements of the micropowder and granules in both reactors were analyzed by XRF, demonstrating that Si (21.49%), Al (10.1%) and Fe (6.75%) were dominant in the micropowder (Figure 3). It was worth noting that the proportions of Si and Al of granules in R2 were 4.99% and 2.45% (Figure 3 G2 sample were 0.5% and 0.27% in R1 (Figure 3 G1 sample


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)

Elemental analysis of micropowder and granules by XRF, G1 and G2 respectively represent granules from R1 (no addition of micropowder) and R2 (adding micropowder) on day 24.
© Copyright Policy
Related In: Results  -  Collection

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

ijerph-12-10056-f003: Elemental analysis of micropowder and granules by XRF, G1 and G2 respectively represent granules from R1 (no addition of micropowder) and R2 (adding micropowder) on day 24.
Mentions: The elements of the micropowder and granules in both reactors were analyzed by XRF, demonstrating that Si (21.49%), Al (10.1%) and Fe (6.75%) were dominant in the micropowder (Figure 3). It was worth noting that the proportions of Si and Al of granules in R2 were 4.99% and 2.45% (Figure 3 G2 sample were 0.5% and 0.27% in R1 (Figure 3 G1 sample

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.