| 高浓度4-氯酚在中空纤维聚砜膜固定化细菌反应器中的共代谢降解研究 |
| 摘要点击 1233 全文点击 1011 投稿时间：2008-11-03 修订日期：2009-01-16 |
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| 中文关键词 生物降解 生物转化 间隙操作 苯酚 膜 |
| 英文关键词 biodegradation biological treatment batch operation phenol membranes |
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| 中文摘要 |
| 悬浮生长的Pseudomonas putida菌可以苯酚为生长基质，通过该细菌的共代谢过程将4-氯酚降解.当苯酚和4-氯酚的浓度达到120 mg/Ｌ和600 mg/Ｌ时，由于基质对细菌的抑制作用，该共代谢过程难以进行，细菌不能生长.通过对细菌在中空纤维膜反应器中固定化，细菌可以降解高浓度的四氯苯酚，即使当苯酚和4-氯酚浓度为200 mg/Ｌ和1 000 mg/L时，利用此中空纤维膜固定化细菌反应器仍可在34 h内都能将其完全降解.与悬浮生长降解菌不同，由于基质在中空纤维膜中质量传递的受限，固定化后的细菌受到中空纤维膜的保护，从而得以生长并降解高浓度的基质. |
| 英文摘要 |
| Pseudomonas putida grown suspendedly can cometabolize 4-chlorophenol（4-CP）in the presence of phenol（growth substrate）. However, cometabolization process cannot be maintained due to the high toxicity of phenol and 4-CP to cells when the initial concentrations of phenol and 4-CP were 120 mg/Ｌ and 600 mg/Ｌ, respectively. Cells can degrade phenol and 4-CP at high concentrations after immobilization in hollow fiber membrane bioreactors. Even when the initial concentrations of phenol and 4-CP were 200 mg/Ｌ and 1 000 mg/Ｌ, the substrates were completely biotransformed with in 34 hours. Different from free suspension cells, immobilized cells were protected by the hollow fiber membranes due to mass transfer limitation in the membranes. The cells can grow and degraded high concentration substrates. |
