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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.


Variation of MLSS and SVI after inoculated high SVI sludge and adding micropowder.
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ijerph-12-10056-f005: Variation of MLSS and SVI after inoculated high SVI sludge and adding micropowder.

Mentions: In the secondary experiment, the high SVI (225 mL/g) sludge dominated by filamentous bacteria, which was aerated without any feeding for 3 days in a lab reactor, was used as the inoculated sludge for R1 and R2. The micropowder (12 g) was added to R2 before start up. More filamentous bacteria occurred in R1 after 7 days (Figure 4(a)). The filaments formed flower-like aggregates on day 27 (Figure 4(c)) and SVI was still high in R1 (Figure 5). In contrast, filamentous bacteria were controlled and formed granules in R2 by adding micropowder (Figure 4(b) and (d)).


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)

Variation of MLSS and SVI after inoculated high SVI sludge and adding micropowder.
© Copyright Policy
Related In: Results  -  Collection

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

ijerph-12-10056-f005: Variation of MLSS and SVI after inoculated high SVI sludge and adding micropowder.
Mentions: In the secondary experiment, the high SVI (225 mL/g) sludge dominated by filamentous bacteria, which was aerated without any feeding for 3 days in a lab reactor, was used as the inoculated sludge for R1 and R2. The micropowder (12 g) was added to R2 before start up. More filamentous bacteria occurred in R1 after 7 days (Figure 4(a)). The filaments formed flower-like aggregates on day 27 (Figure 4(c)) and SVI was still high in R1 (Figure 5). In contrast, filamentous bacteria were controlled and formed granules in R2 by adding micropowder (Figure 4(b) and (d)).

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.