Sensor for Cryptosporidium
نویسندگان
چکیده
Since ancient times, Japan has been blessed with pure, fresh water. For this reason, Japanese people believe that city water is clean and safe and do not hesitate to drink it without boiling. Drinking fresh, unboiled water has been a part of the Japanese way of life. However, in recent years, pollution of river water and groundwater has increased in this country, making that water neither clean nor safe. At present, alarms are being sounded regarding the safety of the water supply. Water supply safety is threatened by the dumping of poisonous substances such as cyanide into river water (unintentional pollution due to unexpected water accidents), the generation of carcinogenic substances such as trihalomethanes caused by the chemical reaction of river water eutrophicated in marshes and lakes, and chlorine (pre-chlorine) used to purify water in water purification plants. There are many examples in foreign countries of rain water, polluted by the feces of both domestic and wild animals, that flowed into rivers which passed through purification treatments in water purification plants and was supplied as city water, resulting in cases of infection by cryptosporidium. To utilize river water effectively, intake gates for city water are often located downstream in rivers. This is believed to increase the risk of contaminating the city water with cryptosporidium. This paper introduces cryptosporidium and countermeasures to prevent it, based on tentative guidelines by the Japanese Ministry of Health and Welfare, and describes sensors and coagulation control techniques required for implementing those countermeasures.
منابع مشابه
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