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- Title
Effect of Long Sludge Retention Time on Biological Phosphorus Removal in A2/O Process.
- Authors
WANG CHANGWEN; LI JUN; ZHAO BAIHANG; YUE YAODONG; WANG YONGLEI
- Abstract
Sludge retention time is an important parameter to the biological phosphorus removal system. This paper investigated the effect of long sludge retention time on biological phosphorus removal in Anaerobic/Anoxic/Aerobic process (A2/O). The results showed that prolonging sludge retention time (SRT) of the A²/O system had no significant impact on biological phosphorus removal efficiency, which slightly decreased from 92.9% (at an SRT of 12 d) to 92.1% (at an SRT of 30 d). Scanning Electron Microscope- Energy Dispersive Spectrometer (SEM-EDS) analysis demonstrated the relative content of phosphorus in dry activated sludge increased from 2.27% to 4.36%, which explained the excellent phosphorus removal performance at long SRT. At the same time, the average particle size increased from 201.57 μm to 256.99 μm, and the flocs at longer SRT had a more spherical and compact structure relative to that at shorter SRT. Our results demonstrated that long SRT was a sustainable way for biological phosphorus removal in A²/O process.
- Subjects
SLUDGE management; SEWAGE sludge; PHOSPHORUS; ANAEROBIC digestion; SCANNING electron microscopy
- Publication
Journal of Residuals Science & Technology, 2015, Vol 12, pS67
- ISSN
1544-8053
- Publication type
Article
- DOI
10.12783/issn.1544-8053/12/S1/10