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題 名 | Morphological Impact on Nitrification Activity in a UCBR=UCBR中菌種形態對硝化活性的影響 |
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作 者 | Ong,S. L.; Ng,W. J.; Lee,L. Y.; | 書刊名 | 中國環境工程學刊 |
卷 期 | 8:4 1998.12[民87.12] |
頁 次 | 頁295-300 |
分類號 | 445.463 |
關鍵詞 | 硝化; 生物膜; 形態學; 密度; 生化需氧量; Nitrification; Biofilm; Morphology; Density; COD; |
語 文 | 英文(English) |
中文摘要 | 本研究實驗系統包括硝化用的UCBR管柱(好氧)和脫硝用的固定床管柱(缺氧)。在 UCBR 和固定床管柱中的填料分別為砂和 raschig 環。系統採連續式進流合成廢水,廢水中 的氮源來自氯化銨而其碳源由醋酸鈉提供。 進入 UCBR 管柱中的剩餘 COD 可支持硝化生物 膜上異營層的生長和形成。 但異營成長導致生物膜密度減少 43.5 %, 銨氮去除效率減少 8.8 %;同時,異營微生物亦會競爭系統中可利用的溶氧。在溶氧量充足的情況下,當 COD 負荷逐漸由 3.15 增加到 5.51kg/cm �� d 時,將有利於絲狀菌的生長;導致生物膜密度在 5 天之內減少 41.5 %。但銨氮去除效率與異營微生物占優勢時之生物膜的效率比較,約高 出 5-8 %。 |
英文摘要 | In this study, an oxic-anoxic system comprising a UCBR column (oxic) for nitrification and a fixed bed column (anoxic) for denitrification was used. The support media in the UCBR and the fixed bed columns were sand and raschig rings, respectively. The system was fed continuously with synthetic wastewater containing ammonium chloride as the nitrogen source and sodium acetate as the carbon source (COD). Residual COD that entered the UCBR column was able to support growth and formation of a heterotrophic layer over the existing nitrifying biofilm. This heterotrophic growth led to an initial reduction of biofilm density by 43.5% and ammonium-nitrogen removal efficiency by 8.8%. Heterotrophic microorganisms also competed for the available dissolved oxygen (DO) in the system. Progressive increment in COD loading from 3.15 to 5.51 kg/m ��.d with no DO limitation created an environment that favored flamentous growth which in turn led to biofilm density reduction by 41.5% within vie days of operation. However, the corresponding ammonium-nitrogen removal efficiency was about 5-8% higher than that obtained when biofilm was predominantly covered by heterotrophic microorganisms. |
本系統中英文摘要資訊取自各篇刊載內容。