The organic mud moves with water flowing in estuary. It is carried to the river with flood tide, and settles on the river bed at a tidal flat. If the purification ability of the organic mud is small, the sludging of the tidal flat is accelerated. The organic mud settled there causes the environment deterioration and loss of waterside scene value.
The environmental quality improvement technology using fly ash for consolidated sediment is proposed. The large pore pipe made by fly ash is embedded in the consolidated mud on sand layer. It can cause the water movement in the pipe with the ebb and flood tide, and the water movement raises living thing habitation environment by supplying oxygen into consolidated mud.
