The production of excess sludge is increasing in Waste Water Treatment Plants (WWTPs) in most of the countries with the modernization of the living style; i.e. increasing of the ratio of sewerage populations. Many approaches are being carried out to treat the excess activated sludge. We have developed a new approach to reduce excess activated sludge by using magneto-ferrite treatment. We have succeeded to use magneto-ferrite treatment in lab. scale to reduce excess activated sludge production. Ferrite particles and electro magnets (EMs) are used in this method. Ferrite particles are non-toxic and safe for biological substances. They can be easily separated from activated sludge by using magnets from the biological substances. In this paper, we will describe the theoretical analysis of our method. We also consider our treatment method with the view of the theoretical analysis. This knowledge in activated sludge treatment process is very important to reduce the production of activated sludge.