| 外循环三相流化床载体挂膜特性研究 |
| 摘要点击 1892 全文点击 1449 投稿时间：2007-10-15 修订日期：2008-01-03 |
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| 中文关键词 外循环流化床 挂膜 污泥投加量 C/N 水力停留时间（HRT） |
| 英文关键词 external loop three phase fluidized bed reactor biofilm formation value of sludge addition C/N hydraulic residence time (HRT) |
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| 中文摘要 |
| 对外循环三相流化床的挂膜进行研究，主要探讨污泥投加量和碳氮比（C/N）对挂膜的影响.结果表明，温度t为20～30℃，活性炭载体粒径r为0.125～0.5 mm时，2 g·Ｌ-1污泥投加量为比5 g·Ｌ-1更有利于挂膜；C/N在8～12之间时流化床挂膜最快，C/N≥14时流化床挂膜困难，易出现污泥膨胀.在挂膜成功的基础上，研究水力停留时间（HRT）对反应器内悬浮生物量和膜生物量的影响，HRT越长悬浮生物量越大，膜生物量在HRT由1～3 h时，随HRT的增长而增加，HRT超过5h时，膜生物量随HRT增长相应减少，HRT在4～5 h时，两者达到平衡. |
| 英文摘要 |
| The experiment on biofilm formation in an external loop three phase fluidized bed reactor was presented in this paper. The effect of the value of sludge addition and C/N ratio were studied. The experiment result showed that at the temperature of 20_30℃, when the diameter of granular activated carbon was 0.125_0.5 mm, the value of sludge addition at 2 g·Ｌ-1 was more propitious to the formation of biofilm than 5 g·Ｌ-1. Formation of biofilm in fluidized bed was the rapidest when C/N ratio was between 8_12. It was difficult and leaned to form filamentous bulking sludge when C/N≥14. On the basis of the success of attached film, the influence of hydraulic residence time (HRT) on the value of suspended sludge and the value of biofilm was studied. The result showed that while HRT expended and the value of suspended sludge increased, the value of biofilm also increased, when HRT was between 1_3 h. But when HRT exceeded 5h, HRT expended and the value of biofilm decreased. when HRT was between 4_5 h, the value of suspended sludge and the value of biofilm were steady. |
