Activated sludge simply ...

Activated sludge simply means that in the presence of oxygen biological mass is formed that allows the organisms to convert soluble organic wastes into suspended solids that can be separated by gravity. Longer aeration times are known as Extended aeration. There are simpler and lower-cost fixed film processes that need much less energy and are easy to operate. Consider the biophilic nature-based design for best results if you have enough land area to use plants and other living organisms to do the treatment.

S. Ram Shrivastava, P.E. , Larsen Engineers, Rochester NY