Abstract: “The sanitation situation in the remote Villages in the Delta Egypt is becoming not only huge Environmental crises but also a crucial health problem. The problem lies in the rising of G.W.T due to the old used systems of disposal (bottomless cesspool "trench"), the waste water is mixing with the G.W.T and causing its rising to the extent that it floods the streets in some cases. One of the solutions that was considered was stabilization ponds, another was Extended Aeration (activated sludge). As new concept the Japanese university introduced Down Hanging sponge as an experienced solution for the task. For many years, decision makers for sanitation in Egypt built their decision upon initial cost only, neglecting the other long term costs like running cost and operation and maintenance and other factors affecting the treatment processes. Then, when fundamentals of Value Engineering science were introduced, thinking began to change. Now after the development of Environmental Engineering sc”

Keywords: Decentralization, Down Hanging Sponge (D.H.S), Environmental Impact Assessment (EIA), Extended Aeration