| 好氧颗粒污泥藻酸盐提取物的聚集形态研究 |
| 摘要点击 2071 全文点击 1823 投稿时间：2007-05-16 修订日期：2007-08-08 |
| 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 好氧颗粒污泥 细菌藻酸盐 超分子自组装 原子力显微镜 |
| 英文关键词 aerobic granules bacterial alginates supramolecular self-assembly atomic force microscopy(AFM) |
|
| 中文摘要 |
| 为探寻细菌藻酸盐对好氧污泥颗粒化的作用，借鉴海藻酸盐的提取方法，将好氧颗粒污泥中的细菌藻酸盐提取和鉴定后，对10～500 mg·L-1范围内不同浓度的藻酸盐提取物在50 mg·L-1 CaCl2溶液中的聚集形态进行了原子力显微镜观察.结果表明，细菌藻酸盐占好氧颗粒污泥干重的35.1%±1.9%.在CaCl2作用下，藻酸盐提取物具有从无序聚集成有序状态的超分子自组装特性，随着浓度的增加，藻酸盐提取物自发聚集，由纳米级的胶束微球聚集为微米级的花状，进而连接成网状成层堆积.好氧颗粒污泥中细菌藻酸盐通过形成具有三维空间结构的细菌藻酸盐-金属凝胶而对颗粒污泥的形成起骨架作用.其中，细菌藻酸盐-Ca2+凝胶在颗粒污泥的形成和维持其稳定结构中起主要作用. |
| 英文摘要 |
| To explore bacterial alginates role in aerobic granules' formation, the alginate was extracted from aerobic granules and identified. Its aggregation property in 50mg·L-1CaCl2 solution was investigated by the atomic force microscopy (AFM). Bacterial alginates amounted to 35.1%±1.9% of granules' dry mass. With the concentration increased from 10 mg·L-1 to 500 mg·L-1 in 50mg·L-1 CaCl2, the extracted alginates tended to form ordered aggregations, with the shape changed from randomly distributed globules, to rod-like and flower-shaped aggregations, and finally to weblike networks due to their supramolecular self-assembly property. The three dimensional alginate-metal gel is the structural polymer of aerobic granules, and the alginates-Ca2+gel formation plays an important role in granules' formation and structure stabilization. |
