Bonadonna L, Briancesco R, Cataldo C, Divizia M, Donia D, Panà A
Istituto Superiore di Sanità, Laboratorio di Igiene Ambientale, Roma, Italy.
New Microbiol. 2002 Oct;25(4):413-20.
The extent of reduction in selected microrganisms was tested at a multi-component wastewater treatment plant that treats sewage for a potential re-use in agriculture. The aim of the investigation was to evaluate possible reciprocal correlation among the different microrganisms and to compare the removal of two encysted pathogenic protozoa with that of microbial indicators, Clostridium perfringens spores, enteroviruses and bacteriophages. Samples collected included the raw wastewater, the chlorinated effluent and the effluent after an ultraviolet light treatment. All of the raw sewage samples were positive for Cryptosporidium oocysts and Giardia cysts, as well as for the other microorganisms tested but the bacteriophage B40-8. The data obtained confirm the removal efficiency of the entire process for indicator bacteria but also show the low and variable removal efficiency for the other microbial parameters, such as Giardia and Cryptosporidium, enteroviruses and Clostridium perfringens spores. Reciprocal correlation between Cryptosporidium and Giardia (oo)cysts and the other microbial groups was not demonstrated. The results confirm the resistance of Clostridium perfringens spores, enteroviruses and protozoa to chlorination and demonstrate the relative persistence of these organisms in the effluents even during the ultraviolet light treatment. The yields also emphasise the influence of the analytical method for the determination of protozoan parasites.
在一家多组分污水处理厂对选定微生物的减少程度进行了测试，该厂处理污水以便在农业中进行潜在的再利用。调查的目的是评估不同微生物之间可能存在的相互关系，并比较两种包囊化致病原生动物与微生物指标、产气荚膜梭菌孢子、肠道病毒和噬菌体的去除情况。采集的样本包括原废水、氯化后出水和紫外线处理后的出水。所有原污水样本中隐孢子虫卵囊和贾第虫包囊均呈阳性，其他测试微生物（除噬菌体B40 - 8外）也呈阳性。获得的数据证实了整个过程对指示菌的去除效率，但也显示出对其他微生物参数（如贾第虫和隐孢子虫、肠道病毒和产气荚膜梭菌孢子）的去除效率较低且不稳定。未证明隐孢子虫和贾第虫（卵）囊与其他微生物群之间存在相互关系。结果证实了产气荚膜梭菌孢子、肠道病毒和原生动物对氯化的抗性，并表明即使在紫外线处理期间，这些生物体在出水中仍具有相对持久性。这些结果还强调了分析方法对原生动物寄生虫测定的影响。
