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Activated sludge is the most extensive application of a city sewage and industrial wastewater biological treatment process. Activated sludge process is generally good support strict, but in order to achieve denitrification, but also created a number of hypoxia, .1914 , E. Ardern WTLockett in England and founded the activated sludge process. They found that through the sewage aeration can be formed floc suspended particles. When these suspended particles remain in the systems, the removal of organic pollutants from several Days reduced to a few hours. They call it suspended particles, especially from the sedimentation tank which collected particles, there are "active", so called "activated sludge."