硝酸鹽及外部碳源對生物除磷系統中污泥除磷特性之影響
Date Issued
2004
Date
2004
Author(s)
張育朕
DOI
zh-TW
Abstract
This study is to investigate the behavior of phosphorous releasing and uptaking from phosphorous-removing bacteria affected by nitrate under different operation parameters，inclusive of: (1) Different enrichment procedure. (2) Different amount of deficient inter-cellular carbon and extra-cellular carbon source. (3) Different C/N ratio. Experimental data were carried out in conditions described above.
Sequencing batch reactors with and without nitrate feeding respectively were used for sludge enrichment in this study. Both sets of sludge with long-term enrichment demonstrated more than 90% phosphorous removal and were used for further study.
In this research, both sets of phosphorous-removing sludge described above demonstrated significant denitrification, however, nitrate-enriched sludge showed less sensitive to nitrate feeding which cause seriously drop of PHB-production in non-nitrate-enriched sludge set. When equal mount of nitrate was present under anaerobic phase, nitrate-enriched sludge denitrified more completely in accompanying phosphorous releasing reaction, however, the reaction rate of both sets declined at later stage.
The critical point which decides the system goes on whether phosphorous releasing or uptaking in anaerobic phase is extra-cellular carbon source. As the PHB-production has not reached the peak and extra-cellular carbon source has not been depleted by denitrification process, the system goes on phosphorous releasing phase, and as denitrification use PHB as inter-cellular carbon due to insufficient extra-cellular carbon source supplied, phosphorous-uptaking phenomenon takes place. The negative effects on phosphorous-removal of nitrate observed in anaerobic phase are not significant as PHB synthesized from extra-cellular carbon source is sufficient for phosphorous uptaking process.
Subjects
釋磷攝磷行為
硝酸鹽
碳源
nitrate
PHB
phosphorous-removing bacteria
Type
thesis
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