Source water pollution with Cryptosporidium oocysts and removal and inactivation in water purification system

一年内对河流中的Cryposporidium污染进行的实地调查在萨加米河的11个车站被带走。河流范围1-11，000卵囊/100 L的几何平均值为24卵囊/1 OOL，Giardia的水平在1-20，000卵囊/lOOL的几何平均值为12卵囊/1 OOL。卵囊和卵囊的水平与热耐受性梭菌的水平明显相关。Thus，热耐受性梭菌渗透率被推荐为水原污染的主要指标。由八层碳图形盘组成的用于不激活Cryptosporidium parvum oocysts的实验研究。臭氧可以减少2个日志在CT产品3 - 6毫克·分钟/L的电感染系统被2-3个日志通过系统一次通过2 - 6毫克·分钟/L的电感染系统。在24小时内，40%被困在碳图形光盘上，72小时内大于8O%。

One-year field survey on Cryposporidium pollution in river water was carried out at 11 stations in Sagami river. The level of Cryptosporidium in the river ranged 1-11,000 oocysts/100L with geometric mean of 24 oocysts/1OOL and the level of Giardia was in the range of 1-20,000 cysts/lOOL with geometric mean of 12 cysts/1OOL.The levels of oocysts and cysts were significantly correlated with the levels of heat-tolerant Clostridium perfringens spores. Thus, the heat-tolerant Clostridium perfringens spores were recommended as primary indicator for protozoan pollution of waters.Experimental study of the assessment of ozonation and electric disinfection system composed of eight layers of carbon graphite disks for inactivating Cryptosporidium parvum oocysts was conducted. Ozonation could reduce the infectivity of the oocysts by 2 logs at CT product of 3 - 6 mg・min/L.Electric disinfection system removed the oocysts by 2-3 logs by passing once through the system. The oocysts trapped on the carbon graphite disc were killed by 40% within 24 hours and by greater than 8O% within 72 hours.