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目的调查深圳市村镇级水厂水源水中贾第鞭毛虫和隐孢子虫污染情况,评价小型供水的生物安全性,并为制订我国饮用水原虫卫生标准提供依据。方法采集深圳市供水规模0.5～5×104t的8家村镇级水厂的水源水,应用美国环保局(EPA)的标准检测方法,水样经抽滤、淘洗、磁分离、染色鉴定等步骤检测其贾第鞭毛虫包囊和隐孢子虫卵囊含量。结果深圳市8家村镇水厂中,有6家水厂的水源水检出贾第鞭毛虫包囊眼0.05～0.65个/L(1～13个/20L)演,1家水厂的水源水检出隐孢子虫卵囊眼0.1个/L(2个/20L)演。结论目前,深圳市村镇级水厂水源水存在原虫污染,在处理工艺不完善的情况下存在介水疾病传播的可能。
Objective To investigate the contamination of Giardia lamblia and Cryptosporidium parvum in the water source and water of Shenzhen township waterworks, evaluate the biological safety of small water supply, and provide the basis for formulating the hygienic standard of drinking water protozoa in our country. Methods Water samples were collected from 8 villages and towns in the water supply scale of 0.5-5 × 104t in Shenzhen City. The standard detection methods of the US Environmental Protection Agency (EPA) were adopted. The water samples were filtered, eluted, separated and stained. Detection of its Giardia cysts and Cryptosporidium oocysts content. Results Among the 8 waterworks in 8 towns and villages in Shenzhen, water samples from 6 waterworks showed 0.05 ~ 0.65 cells / L (1 ~ 13 cells / L) of Giardia cysts and 1 water source water Cryptosporidium oocysts 0.1 / L (2 / 20L) show. Conclusion At present, there is protozoa pollution in the source water of the township-level waterworks in Shenzhen. There is a possibility that water-borne diseases may spread when the treatment process is not perfect.