1.Even in very small amounts, as long as there is a single pathogen enters the body, it will harm the prevalence.
2.Characteristics of the pathogens:small,large, resistance.
Biological pollution is mainly due to the parasites, bacteria and viruses.
Parasites: schistosomiasis(血吸虫病)
Schistomosomiasis lesions are mainly caused by their eggs.They are（eggs) living in the host of the liver and colon tissues, and cause granuloma and fibrosis(肉芽肿瘤和纤维化)
[1]Pink, Daniel H. (April 19, 2006). "In;s Liquid Gold". Yahoo. [2]West, Larry (March 26, 2006). "World Water Day: A Billion People Worldwide Lack Safe Drinking Water". About.
F1. schistosome
F2. vibrio cholerae
F3. Mechanism of action of cholera toxin
F4. Poliovirus
A variety of pathogenic factor into the water environment, can cause acute or chronic poisoning.
The classification of water pollution
chemical microorganism
Kinds of harmful substances
biological
animals
plants
physical
The features of pathogenic microorganism in drinking water
Conventional drinking water treatment technology can not effectively remove them，Because they are very resistant to disinfection and difficult to be removed, therefore, focus on the purification technology of drinking water is to remove organic pollutants and pathogenic microorganisms (especially the Cryptosporidium)
What measures have we taken?
"Drinking
water hygiene standards" (GB5750-2006), total coliform, thermotolerant coliform bacteria and Escherichia coli, the total number of colonies, Jia Di Giardia and Cryptosporidium as 6 indicators of microbial.
The Effects of Water Pollution on Human Health
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Introduction
Water pollution is a major global problem which requires ongoing evaluation and revision of water resource policy at all levels (international down to individual aquifers and wells). It has been suggested that water pollution is the leading worldwide cause of deaths and diseases ，and that it accounts for the deaths of more than 14,000 people daily.
《生活饮用水卫生标准》（GB5750-2006）中，选择总大肠菌群、耐热大肠菌群、大 肠埃希菌、菌落总数、贾第鞭毛虫和隐孢子虫作为微生物的6个指标
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The definition of water pollution
It is any chemical,biological,or physical change in water quality that has a harmful effect on living organisms or that makes water unsuitable for desired use.