Suspended growth processes are mainly aerobic processes, which through the recycling of biological solids, are able to gain high concentrations of microorganisms. The microorganisms change biodegradable, organic wastewater constituents and particular inorganic segments into new cell masses and byproducts. The end results of this biodegradation process can be removed by gaseous settling, stripping, and related physical means.
Attached growth biological wastewater treatment processes employ the principle of organic matter removal, made possible due to the presence of microorganisms. The microorganisms involved in such processes are aerobic and therefore rely on oxygen for survival. Their survival also requires a filter media, which includes materials “like sand, plastic, gravel or peat to aid in the development of a film on the media through the recycling of dissolved organic material†(Massoud & Abrishamchi 2005).
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