| 内源碳PHA的贮存对混合菌群耐低温特性的影响 |
| 摘要点击 1480 全文点击 397 投稿时间：2018-09-18 修订日期：2018-10-07 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 脱氮除磷 聚羟基烷酸酯(PHA) 低温 低C/N 混合菌群 |
| 英文关键词 nitrogen and phosphorus removal polyhydroxyalkanoate (PHA) low temperature low C/N mixed growth microbial community |
|
| 中文摘要 |
| 本文研究碳源调控磷回收强化生物脱氮除磷（biological bio-nutrient removal-carbon regulation and phosphorus recovery，BBNR-CPR）反应器耐低温特性.不断降低BBNR-CPR反应器运行温度，发现BBNR-CPR反应器能够长期在低温（≤15℃）、低C/N比（<4.16）条件下稳定运行，维持总磷的平均去除率为91.20%，氨氮的平均去除率为81.10%，总氮的平均去除率为58.62%.随着运行时间的增加与温度的下降，BBNR-CPR反应器生物内膜具有脱氮除磷以及PHA贮存功能的种属Candidatus_Competibacter、Candidatus_Accumulibacter、Run-SP 154、Thauera、Candidatus_Nitrotoga的相对丰度不断提高，成为耐受低温条件的优势种属.在相同碳源浓度、合成PHA的时间一致的条件下，生物膜内PHA的合成量受温度影响；25、15和8℃合成的PHA量分别占生物膜干重的16.24%、11.49%和9.01%.预贮存PHA的生物膜具有耐受低温的能力；在高PHA水平，8℃和15℃的除磷效率分别为97.46%和100%，脱氮效率分别为55.15%和82.55%；而在低PHA水平，8℃和15℃的除磷效率分别为11.39%和35.02%，脱氮效率分别为0%和12.10%. |
| 英文摘要 |
| This study investigated the removal of nitrogen and phosphorous by a biological bio-nutrient removal-carbon regulation and phosphorus recovery (BBNR-CPR) reactor at low temperature. The operating temperature of the BBNR-CPR reactor was continuously reduced, and it was found that the BBNR-CPR reactor could operate steadily at low temperature (<15℃) and low C/N ratio (<4.16). The average removal rates of total phosphorus, ammonia, and total nitrogen were 91.20%, 81.10%, and 58.62%, respectively. With increasing running time and decreasing temperature, the relative abundance of Candidatus_Competibacter, Candidatus_Accumulibacter, Run-SP 154, Thauera, and Candidatus_Nitrotoga increased. These bacteria had the functions of nitrogen and phosphorus removal and the storage of polyhydroxyalkanoate (PHA) in the biofilm of the BBNR-CPR reactor and became the dominant species to tolerate low temperature. It was found that low temperatures reduced the amount of PHA synthesized for a given equal carbon source concentration and reaction time. The amounts of PHA synthesized at 25℃, 15℃, and 8℃ accounted for 16.24%, 11.49%, and 9.01% of the dry weight of the biofilm, respectively. The pre-stored PHA biofilm has the capacity to resist low temperature. At high PHA levels, the phosphorus removal efficiencies at 8℃ and 15℃ were 97.46% and 100%, respectively, and the denitrification efficiencies were 55.15% and 82.55%. At low PHA levels, the phosphorus removal efficiencies at 8℃ and 15℃ were 11.39% and 35.02%, respectively, and the denitrification efficiencies were 0% and 12.10%, respectively. |
|
|
|
