Water Pollution and Its Prevention. Chapter 17. Water Pollution defined as the presence of a substance in the environment that, because if its chemical composition or quantity, prevent the functioning of natural processes and produces undesirable environmental and health effects.”
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Remove grit and debris – water passes through a series of screens. The water is slowed to allow the grit go settle out. This is taken to a land fill. (you’d be amazed at what goes down a toilet)
it uses organisms and their metabolism to feed on the colloidal and dissolved organic material and break it down to CO2 and water. The water flows over a series of rocks on which live organisms, detritus feeders, live. Oxygen is provided for the system.