Types and characteristics of drinking water contamation lif
comprises a biological contamination of drinking water contamination (pollution of water-borne diseases and algae), chemical and physical contamination of drinking water drinking (hot, radioactive) contamination. 1, household drinking water purifier water-borne disease of a disease spread by contact with water or drinking contaminated by pathogenic microorganisms, known as aqueous diseases. (1) sources of pollution: pathogens, waterborne diseases mainly three types: 鈶?bacteria such as typhoid bacillus, paratyphoid bacillus, Vibrio cholerae, Shigella, pathogenic E. coli, Leptospira; 鈶?viruses, such as A and type hepatitis virus, poliovirus, coxsackie virus, human rotavirus and adenovirus; 鈶?protozoa, such as Giardia lamblia, Cryptosporidium, Entamoeba histolytica parasite, Schistosoma like. They mainly come from human and animal feces, sewage, hospitals and sewage and livestock slaughter, leather and food industry waste water. (2) causes: water containing pathogens, feces after the contamination of water, without valid i.e. for purification and disinfection of drinking water contaminated drinking or resident pathogens in the water distribution and water storage during the processing. Further when people swimming, labor, flood, contacting the pathogen (e.g., Leptospira schistosome cercariae) water pollution, directly into the epidemic spread of diseases caused by the body through the skin or mucous membranes. , (3) Clinical features: the occurrence of water-borne diseases, mainly in the following three characteristics: 鈶?water if it is a one-time serious pollution, showing the state of an outbreak, there may be a large number of cases in the short term, and the vast majority of cases date of onset, are concentrated in the same incubation period. If the water is often several times the contamination, showing sporadic fashion trends, case throughout the year; 鈶?distribution of cases is consistent with the scope of the water supply contaminated water sources, the vast majority of cases have the same history of drinking water sources. 鈶?Once the drinking water sources are controlled, to strengthen drinking water after purification and disinfection, epidemic will quickly terminated. Size and low incidence propagation range of water-borne diseases, the type of water supply, water supply range (or ranges of water pollution), the water is polluted degree and frequency, the kind of pathogen. Health habits of residents, drinking water purification and disinfection measures, etc., are closely related. (4) common water-borne diseases: the statutory eight kinds of water-borne diseases, in addition to non-statutory water-borne diseases. Legionnaires disease and as Cryptosporidium, Giardia caused by water-borne diseases. Water-borne diseases in generalTo intestinal infectious diseases more common.
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