【摘要】 蛭形轮虫常被用作生物处理性能良好的指示生物.本文以一种常见的蛭形轮虫—旋轮虫(Philodina sp.)为研究对象,着重探讨了旋轮虫及其分泌物对活性污泥处理性能和细菌的作用方式,以明确旋轮虫在污水生物处理中的作用机制.结果表明,旋轮虫及其分泌物均在一定程度上提高了活性污泥对COD、氨氮、总磷的去除率,且两者的提高效果相近,表明旋轮虫分泌物是旋轮虫对活性污泥的主要作用形式,即非直接捕食性的间接作用是其主要作用形式.旋轮虫分泌物对絮凝性细菌的絮凝性、异养硝化-好氧反硝化菌的同步硝化和脱氮效能均有促进作用,进一步表明旋轮虫提高活性污泥活性的作用是通过其分泌物提高细菌活性的结果.此外,通过使用根癌农杆菌KYC55从旋轮虫分泌物中检测出AHLs信号分子的类似物,表明旋轮虫对细菌的作用机制可能是其分泌物误导或触发细菌的群体感应所致.本文结果为研究微型动物在污水生物处理中的作用机制提供了新的研究思路.更多还原

【Abstract】 The bdelloid rotifers are often used as indicator organisms in biological wastewater treatment. In this paper, a common bdelloid rotifer, Philodina sp., was selected as a research object, and the effects of Philodina sp. and its secretion on the performance of activated sludge and the bacteria behavior were studied to determine the mechanism of Philodina sp. in biological wastewater treatment. The results show that both Philodina sp. and its secretion increased COD, ammonia nitrogen and total phosphorus remvoal by activated sludge, in similar pace, suggesting that the secretion of Philodina sp. is the main factor affecting the activated sludge. The Philodina sp. secretion can promote the flocculation of bacteria and the nitrogen removal by simultaneous heterotrophic nitrifying-aerobic denitrifying bacteria. In addition, the analogs of AHLs signaling molecules were detected in the secretion of Philodina sp. by using Agrobacterium tumefaciens KYC55, implying that the influence of on bacteria may be due to the secretion of Philodina sp. induces quorum sensing of bacteria. The results of this study provide a new idea for investigating the function of microfauna in biological wastewater treatment.更多还原