Filter Vessel: The filter vessel is a cylindrical or rectangular tank that contains the filter media. It is designe to withstand the operating pressure of the system. The vessel is usually made of steel or reinforc concrete and is equippe with inlet and outlet connections.
Filter Media: The dual media filter utilizes two or more layers of different filter media with varying particle sizes. The media layers are arrange in a specific sequence within the filter vessel. Common combinations include anthracite coal and silica sand, anthracite coal and garnet, or anthracite coal, sand, and gravel. The larger media, such as anthracite coal or garnet, are place at the top, while the finer media, such as silica sand, are position at the bottom.
Distribution System: The distribution system ensures even distribution of the influent wastewater across the filter media bed. It typically consists of underdrains, lateral pipes, and nozzles that distribute the water uniformly over the surface of the media.
Backwash System: A backwash system is incorporat in the dual media filter to periodically clean the filter media and remove accumulate solids. It includes a backwash pump, valves, and a wash water collection system. The backwashing process involves reversing the water flow and fluidizing the media bed to dislodge trap particles.
Control System: A control system monitors and regulates the operation of the dual media filter. It controls flow rates, backwashing cycles, and other parameters to optimize the filtration process and ensure efficient operation.