生物慢滤技术中的微生物作用研究

The study on the biological mechanism by bio-slow sand filtration

为了探讨生物慢滤反应器中的微生物作用,本文对滤床不同深度的滤料取样进行扫描电镜分析,结果表明,表层生物黏膜中含有丰富的微生物种群,包括细菌、藻类、原生动物以及各种微生物分泌物,这些微生物形成了良性循环食物链。本文对滤床不同深度的滤料取样分析了细菌总数、SS、POC三个指标,结果表明,微生物主要集中在表层滤料2cm厚度内,滤床达到90cm高度即能保证出水水质,这为生物慢滤反应器设计和运行维护提供了参考数据。随后对生物慢滤反应器进行了避光试验,结果表明,生物慢滤反应器采取适当的遮挡避光措施既可以有效减少藻类生长,增加运行周期,又不会降低处理效果,对于我国福建、四川、湖北等地生物慢滤技术的实际应用具有指导意义。

In order to investigate the microbial mechanism in bio-slow sand filter, the filter material was sampled at different depth of the filter bed. Scanning Electron Microscopy （SEM） analysis results show that the surface layer is rich in biological membranes of microorganisms, including bacteria, algae, protozoa and various microbial secretions. These microbes form a virtuous food chain. In this paper, the fiher materi- al was sampled at different depth of the filter bed. Three indices of the total number of bacteria, SS, POC were analyzed. The results show that microorganism mainly concentrates in the surface of the filter within 2cm in thickness, and the filter bed is 90cm hight which can guarantee the water quality. These will pro- vide reference data for bio-slow sand filter design and operation. In this paper, the covered bio-slow sand filter was tested. The results show that taking appropriate measures to keep out light can effectively reduce the algae growth, increase the operation cycle, and will not reduce the treatment effect. This will help us guide the bio-slow sand filter of Fujian, Sichuan, Hubei provinces in China.