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

張育朕(Yu-Chen Chang)

指導教授 ： 曾四恭

國立臺灣大學/工學院/環境工程學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.10279

摘要

本研究為了釐清硝酸鹽在不同條件下，磷蓄積菌之攝磷釋磷行為影響，進行各項操作條件進行試驗，包括：（1）不同馴養污泥，（2）不同量之細胞內碳源（PHB）及外部碳源，（3）不同C/N。
研究中以連續式批次反應槽進行脫硝馴養污泥及無脫硝馴養污泥，長期馴養下除磷效果均達90%以上，再將兩種污泥進行各種條件之批次試驗。
本研究顯示不論是否經硝酸鹽馴養之除磷污泥，皆有明顯的脫硝作用，於厭氧釋磷段有硝酸鹽進入除磷系統時，脫硝量越大造成釋磷量及PHB合成量減少越大，但經脫硝馴養之污泥，其影響程度較無脫硝馴養污泥為少。經脫硝馴養污泥比無脫硝馴養污泥脫硝效率佳，於等量硝酸鹽進入厭氧環境，脫硝馴養污泥在脫硝釋磷反應較容易完全脫硝，後段不易發生脫硝攝磷作用。
除磷系統中硝酸鹽造成厭氧段釋磷或攝磷的關鍵為外部碳源，於污泥細胞PHB未達最大合成量及脫硝反應所消耗之碳源為外部碳源時，會發生釋磷反應，若外部碳源不足時，脫硝作用以細胞內PHB為碳源，會出現攝磷反應。當外部碳源所合成之細胞PHB足已提供攝磷作用時，硝酸鹽在厭氧段所造成的影響對除磷程序之除磷效果完全沒有影響。

關鍵字

釋磷攝磷行為 ； 硝酸鹽 ； 碳源

並列摘要

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.

並列關鍵字

nitrate ； PHB ； phosphorous-removing bacteria

參考文獻

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