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Microbial community analysis and performance of a phosphate-removing activated sludge
Yan Liu1, Tong Zhang, Herbert H P Fang
1Environmental Biotechnology Laboratory, Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong.
Bioresource Technology
|March 1, 2005
Summary
Microbial analysis of phosphate-removing activated sludge revealed a diverse community, primarily Proteobacteria and Cytophaga-Flavobacterium-Bacteroides. Despite Acinetobacter
Area of Science:
- Environmental microbiology
- Wastewater treatment microbiology
Background:
- Phosphate removal is crucial for preventing eutrophication.
- Activated sludge processes are widely used for wastewater treatment.
- Identifying key microbial players in enhanced biological phosphorus removal (EBPR) is essential.
Purpose of the Study:
- To characterize the microbial community of a phosphate-accumulating activated sludge.
- To identify bacterial species responsible for high phosphate removal efficiency.
Main Methods:
- 16S ribosomal DNA (rDNA) sequence analysis of 114 clones.
- Hybridization with Acinetobacter-specific probes.
- Staining with phosphate-specific dyes.
Main Results:
- The activated sludge achieved >99.9% phosphate removal from wastewater.
- The microbial community was dominated by Proteobacteria (71.0%) and Cytophaga-Flavobacterium-Bacteroides (23.7%).
- Acinetobacter (31.6% of clones) was identified but did not accumulate phosphate.
Conclusions:
- The bacterial species responsible for the high phosphate removal remain unidentified.
- Further research is needed to pinpoint the key phosphate-accumulating microorganisms in this sludge.