water pollution(9)

关于水污染的源头及处理和解决方法的一份英文课堂ppt

Reducing Water Pollution through Sewage Treatment Advanced or tertiary sewage treatment:– Uses series of chemical and physical processes to remove specific pollutants left (especially nitrates and phosphates).

Water is chlorinated to remove coloration and to kill disease-carrying bacteria and some viruses (disinfect).

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