深圳市村镇级水厂水源水中隐孢子虫和贾第鞭毛虫调查

Investigation on Water Source Pollution by Cryptosporidium parvum and Giardia lamblia in the Small Towns and Villages in Shenzhen,China

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 water source pollution by parasitic protozoa in small towns and villages in Shenzhen, China, in order to present the data to establish the national hygienic standard for controlling parasitic protozoa pollution. Methods The samples of water source were collected from 8 village level water plants in Shenzhen. Giardia lamblia and Cryptosporidium were detected, according to the EPA methods, by filtering, rinsing, magnetic isolation and staining. Results Giardia lamblia was found in water sources of 6 water plants and Cryptosporidium was found in one water plant. Conclusion At present, some water sources of village level water plants where the reservoirs were used as the water source in Shenzhen have been polluted by Giardia lamblia and Cryptosporidium, that indicates the potentiality of the water-born-diseases in that areas.