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Related Experiment Video

Updated: Apr 5, 2026

Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge

Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge

Published on: September 26, 2016

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

Jun Li^1,2, Jun Liu³, Danjun Wang⁴

¹College of Biological and Environmental Engineering, Zhejiang University of Technology, No.18 Chao Wang Road, Hangzhou 310014, China. tanweilijun@zjut.edu.cn.

International Journal of Environmental Research and Public Health

|August 27, 2015

Summary

This summary is machine-generated.

Adding micropowder from dry sewage sludge to sequencing batch reactors (SBRs) significantly accelerates aerobic sludge granulation. This method effectively controls filamentous bacteria, reducing granulation time by 15 days and improving sludge settleability.

Keywords:

aerobic granulation dry sewage sludge filamentous bacteria granule micropowder

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Area of Science:

Environmental Engineering
Microbiology
Wastewater Treatment

Background:

Aerobic granulation in sequencing batch reactors (SBRs) is crucial for efficient wastewater treatment.
Traditional SBRs can suffer from slow granulation and filamentous bulking, impacting performance.
Developing cost-effective methods to enhance aerobic granulation is an ongoing challenge.

Purpose of the Study:

To investigate the effect of adding micropowder from municipal dry waste sludge on aerobic granulation in SBRs.
To evaluate the potential of this method to accelerate granulation and control filamentous bacteria.
To elucidate the mechanisms behind accelerated aerobic granulation.

Main Methods:

A sequencing batch reactor (R2) was operated with synthetic wastewater and micropowder from dry sewage sludge.
A control reactor (R1) used traditional SBR operation without micropowder.
Sludge granulation time, filamentous bacteria presence, sludge volume index (SVI), and elemental composition (XRF) were analyzed.

Main Results:

Aerobic sludge granulation time was reduced by 15 days in the reactor with micropowder (R2) compared to the control (R1).
The addition of micropowder effectively controlled filamentous bacteria, preventing bulking and promoting the formation of large granules.
Sludge Volume Index (SVI) decreased significantly from 225 mL/g to 37 mL/g, indicating improved settleability.
X-ray Fluorescence (XRF) analysis confirmed the accumulation of Aluminum (Al) and Silicon (Si) from the micropowder within the granules.

Conclusions:

Micropowder derived from dry sewage sludge effectively accelerates aerobic granulation in SBRs.
The micropowder acts as nuclei, enhances organic load to control filamentous bacteria, and aids granule shaping through physical forces.
This approach offers a promising strategy for improving wastewater treatment efficiency through enhanced sludge granulation.