Rapala J, Niemelä M, Berg K A, Lepistö L, Lahti K
Finnish Environment Institute, PO Box 140, FIN-00251 Helsinki, Finland.
Water Sci Technol. 2006;54(3):23-8. doi: 10.2166/wst.2006.443.
The removal of cyanobacteria, hepatotoxins produced by them (microcystins), phytoplankton, heterotrophic bacteria and endotoxins were monitored at a surface water treatment plant with coagulation, clarification, sand filtration, ozonation, slow sand filtration and chlorination as the treatment process. Coagulation-sand filtration reduced microcystins by 1.2-2.4, and endotoxins by 0.72-2.01 log10 units. Ozonation effectively removed the residual microcystins. The treatment process reduced phytoplankton biomass by 2.2-4.6 and heterotrophic bacteria by 2.0-5.0 log10 units. In treated water, the concentration of microcystins never exceeded the WHO guide value (1 microg/L), but picoplankton and monad cells were often detected in high numbers. The heterotrophic bacterial isolates from the treated waters belonged to genera Sphingomonas, Pseudomonas, Bacillus, Herbaspirillum and Bosea.
在一个采用混凝、澄清、砂滤、臭氧化、慢砂滤和氯化作为处理工艺的地表水净化厂，对蓝藻、其产生的肝毒素（微囊藻毒素）、浮游植物、异养细菌和内毒素的去除情况进行了监测。混凝 - 砂滤使微囊藻毒素减少了1.2 - 2.4，内毒素减少了0.72 - 2.01个对数单位。臭氧化有效地去除了残留的微囊藻毒素。该处理工艺使浮游植物生物量减少了2.2 - 4.6，异养细菌减少了2.0 - 5.0个对数单位。在处理后的水中，微囊藻毒素的浓度从未超过世界卫生组织的指导值（1微克/升），但经常检测到大量的微微型浮游生物和单胞菌细胞。从处理后的水中分离出的异养细菌属于鞘氨醇单胞菌属、假单胞菌属、芽孢杆菌属、草螺菌属和博斯氏菌属。
