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Ozone disinfection Types of microorganisms

The main types of pathogenic microorganisms in water are bacteria, viruses and protozoa [30]. Bacteria are single-cell organisms that vary in size from 0,1 to 10 µm. The most commonly known species of baceria are E. Coli and Salmonella.
Viruses are a group of very small, infection-causing agents. They be found found in animals, plants and humans on the intracelular level. Viruses differ from bacteria because they do not have cytoplasms or cell organels. A virion or virus particle is only a small clog of genetic matter (DNA or RNA), surrounded by a protein mantle. There are only a few types that contain a cell membrane. The size of a virus can be anywhere between 0,01 and 0,1 µm. Examples of commonly known viruses are the Rotavirus and the Polio virus.
Protozoa are single-cell organisms that contain a core. They are very mobile and live off solid nutrients. They can be found in water, where they are a food source for fish and other water animals. Protozoa vary in size between 1 and 20 µm. Examples of protozoa are Cryptosporidium Parvum and Giardia Lambia.
For most disinfectants, protozoa are resistant to the mechanisms most often and viruses secondly. Bacteria are rarely resistant to disinfection [7,30].

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