Edward R Highstreet

46922482, Sep 8, 1987

Feb 26, 1986

6/833000

Forrest B. Stannard - Inverness FL
Edward J. Highstreet - Crystal River FL

The Dehydro Corporation - Charlotte NC

B01D 3302

210403

Improved devices for filtration of fluid suspensions that form flow resistant filter cakes, e. g. , waste-water treatment sludges, have a cylindrical filter unit mounted for rotation about an approximately horizontal axis. Influent is charged in one end, filter cake forms on an inner rigid filter media surface and discharges at the other end. Pressurized air is applied along a top, longitudinal area and vacuum assist is applied along a bottom longitudinal area of the rotating filter unit. In preferred embodiments, the cylindrical unit is formed of wire spirally wound into a cylinder with spaces therebetween, there are a plurality of spaced apart bars fixed normal to the helical wire on the inner surface and rigid filter media formed of particulate material bonded in a resin matrix fills the cavities between the bars and covers the wire spirals.

46816895, Jul 21, 1987

Feb 26, 1986

6/833002

Forrest B. Stannard - Inverness FL
Edward J. Highstreet - Crystal River FL

The Dehydro Corporation - Charlotte NC

B01D 3308

210784

Filter units for use in filtering liquid suspensions of material prone to form a filter cake resistant to continued flow of filtrate therethrough, e. g. , wastewater treatment sludge, have a pair of planar sides arranged in a V-shape. Such sides are formed of rigid filter media, e. g. , porous sheets of granular material bound in a resin matrix. Suspension to be filtered is charged into the trough and filtrate is drawn by vacuum through its porous sides. A plurality of such units are arranged side-by-side about a common center in a cylindrical assembly which can be rotated about such center at a predetermined rate to permit each unit to pass through a series of filtering steps to provide new filtering methods.

44315490, Feb 14, 1984

Sep 20, 1982

6/420609

Edward J. Highstreet - Lake Wylie SC
Forrest B. Stannard - Ft. Lauderdale FL
Louis H. Piper - Richmond VA
Michael A. Dimitriou - Richmond VA

DeHydro Corporation - Charlotte NC

B01D 3920

210791

Modules for use in forming rigid filter beds by laying a plurality of the modules side-by-side upon a flat base are in the form of porous, planar elements having a continuous, polygonal upper surface, a continuous lower surface approximately coterminous to the upper surface, and sides normal to said surfaces of substantially equal depth much shorter than their length, such elements comprising laminated layers, each layer being formed of particulate material of substantially uniform size rigidly fixed together in a matrix of cured binder, the particles of the layers being substantially different in size than the particles of the adjacent layers, the top surface being flat and the bottom surface being channelled. In preferred forms, the modules' surfaces are square, there are only a top layer and a bottom layer, the top layer is much thinner than the bottom layer and the particles in the top layer are appreciably smaller than the bottom layer particles. Methods of forming the modules and of using them to form filter beds are also disclosed.