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Updated: Jun 9, 2025

Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
Low-intensity ultrasound combined with inert particles to improve denitrifying flocculated sludge performance and
Ran Gao1, Hao Jin1, Junlan Dong1
1School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China.
Abstract:
To enhance the understanding of flocculated sludge granulation, this study focused on a bacterial denitrification system using low-intensity ultrasound and inert particles to stimulate cell activity and facilitate flocculated sludge granulation. After 75 days, the activated carbon, activated carbon + ultrasonication, and microplastic + ultrasonication groups showed partial pelletization. Both ultrasound and inert particles promoted extracellular polymeric substance secretion and enhanced electron transport system activity. Low-intensity ultrasound improved denitrification performance and enhanced denitrifying bacteria. The addition of inert materials facilitated denitrifying flocculated sludge granulation. Low-intensity ultrasound combined with microplastics obtained the highest activity and enrichment of denitrifying bacteria in granular sludge. This study provides new ideas for optimizing anaerobic sludge granulation.
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