Biological characteristics of waterwastewater

Specialists or practitioners who work in the water/wastewater treatment field must have not only a general understanding of the microbiological principles presented in Chapter 8 but also some knowledge of the biological characteristics of water and wastewater. This knowledge begins with an understanding that water may serve as a medium in which thousands of biological species spend part, if not all, of their life cycles. It is important to understand that, to some extent, all members of the biological community are water-quality parameters, because their presence or absence may indicate in general terms the characteristics of a given body of water.

The presence or absence of certain biological organisms—pathogens—is of primary importance to the water/wastewater specialist. Pathogens are organisms that are capable of infecting or transmitting diseases in humans and animals. It should be pointed out that these organisms are not native to aquatic systems and usually require an animal host for growth and reproduction. They can, however, be transported by natural water systems. These waterborne pathogens include species of bacteria, viruses, protozoa, and parasitic worms (helminths). The following sections provide a brief review of each of these types of pathogens.

Guide to Alternative Fuels

Guide to Alternative Fuels

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