초록 ▼

An apparatus, such as a granular media filter, for treating liquid, such as wastewater, including a settler assembly for reducing media loss during high-turbulence washing of media in the granular media filter. The settler assembly is comprised of plates, tubes, or other porous materials placed betw

An apparatus, such as a granular media filter, for treating liquid, such as wastewater, including a settler assembly for reducing media loss during high-turbulence washing of media in the granular media filter. The settler assembly is comprised of plates, tubes, or other porous materials placed between a system of baffles and a backwash trough. The settler assembly reduces turbulence near the overflow weir edge of the backwash trough, thereby reducing media carry over with the backwash water into the backwash trough. The trough baffle settler assembly will allow higher backwash rates per backwash with the same or lower media losses than experienced with previous trough-baffle designs, thereby reducing costs of construction and operation of granular media filter systems. The settler assembly is particularly adapted for use with granular media filters employing simultaneous application of air and water to produce a high turbulence backwash.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for treating liquid, said apparatus comprising:a tank having an upper portion and a bottom for containing liquid and a bed of media for treating liquid flowing through the bed of media,a trough in the tank positioned above the bed of media for draining off li

[ What is claimed is:] [1.] An apparatus for treating liquid, said apparatus comprising:a tank having an upper portion and a bottom for containing liquid and a bed of media for treating liquid flowing through the bed of media,a trough in the tank positioned above the bed of media for draining off liquid when fluid is supplied through the bed of media, the trough having a length and including a lower portion and upwardly extending sides, at least one of the sides having an upper edge defining a weir,a baffle assembly for controlling upward fluid flow around the trough and for deflecting upwardly flowing fluid and entrained media grains away from the trough, the baffle assembly including at least one baffle portion spaced from the trough, anda settler assembly located between the baffle portion and the trough, the settler assembly including means defining at least one row of flow passages for controlling upward fluid flow adjacent the trough and preventing turbulent flow of liquid flowing upwardly between the trough and said baffle portion, the row of flow passages being between the trough and the baffle portion, the row of flow passages extending along the length of the trough and the row of flow passages each being divided into a plurality of discrete and separate flow passages, the flow passages being separated with respect to one another and spaced substantially along the length of said trough.