Abstract:
An above grate based inlet filter system for erosion and sediment control comprises a natural fiber filter mat configured to extend beyond the perimeter of the grate and a securing mechanism, such as magnets, configured to securing the filter mat around the perimeter of the grate. The system may include a filter berm secured in vicinity to the mat, and a rectangular array of magnets coupling the filter mat to the grate. The natural fiber filter mat may effectively be a coir fiber filter mat extending beyond the perimeter of the grate, wherein the coir fiber filter mat is formed of vertically aligned coir fibers. The optional filter berm may be effectively formed as triangular in cross section and formed of 100% reticulated polyether foam and formed to be at least 3″ in height.
Abstract:
A system for rapidly dewatering sludge in large quantities makes use of a filter plate that is capable of supporting heavy mechanized removal equipment without damage to the filter plate. The filter plate is monolithic and includes granular filter material that is rigidified and bonded together. In the disclosed process, sludge is pretreated with a polymer coagulant that breaks up solids and flocculates the sludge particles. The flocculated sludge is then spread on a bed of filter plates. As the bed is being filled, the large coagulated sludge particles settle and water is drawn off by gravity. A vacuum is then applied to the bed and the sludge is rapidly dewatered. Upon completion of dewatering, front end loading equipment may be used to remove the dried sludge cake from the bed.
Abstract:
A method of spreading a pulp for the purpose of drying it naturally, the pulp having a solid fraction which has a d.sub.80 of less than 100 microns. This method comprises the following steps:(a) adjusting the level of solids of the pulp to between 2 and 25%;(b) adding a flocculating agent to the pulp and mixing it with same, the amount of said flocculating agent being between two thirds and 98% of the optimum required for the flocculation of said pulp; and(c) spreading the mixture of pulp and flocculating agent, in the open air, in a bed the sides of which are permeable, and the bottom of which has a slope of less than 5 meters per 1000 meters, said spreading taking place 1 to 20 minutes after the adding and mixing of the flocculating agent.
Abstract:
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.
Abstract:
An eductor truck having a frame with a settling tank pivotally mounted thereon. The settling tank having an eductor unit and a valve for the eductor mounted on the tank. The valve has an arm which can be used manually or by use of a hydraulic unit to operate the valve. A storage unit is mounted on the frame adjacent the settling tank. Pivoting means and door latching means are also provided.
Abstract:
A waste water filtration and sludge removal system for filtering and removing sludge materials suspended in water resulting from steel pickling and cleaning operations and the like. The system includes a trough-like filtering tank having weep holes along the lower edge draining into an inclined channel for capturing filtered water for reuse, and also includes a multiple layer filter bed containing an upper layer of fine jagged surfaced particles for capturing filtered sludge. The sludge layer deposited on the surface of the upper filter layer is periodically moved by means of an adjustable screed blade toward an elevated discharge station for removal from the tank without significantly disturbing the filter bed. The screed blade may be automatically raised out of contact with the sludge layer when operated in the reverse direction.
Abstract:
Schlammentwässerungssystem insbesondere für Autowaschanlagen oder dergleichen mit einem Container (10), in dem sich Feststoffpartikel absetzen und die sich abtrennende Flüssigkeit abgeführt wird, wobei an mindestens einer Seitenwand (12) des Containers (10) in geringem Abstand eine Filtertafel (20) angeordnet ist und der zwischen der Seitenwand (12) und der Filterplatte (20) gebildete Zwischenraum (29) zumindest im unteren Bereich mit mindestens einem Wasserablauf(32, 34) versehen ist. Zur verbesserten Entwässerungswirkung wird vorgeschlagen, an wenigstens einer Seitenwand (12, 16) des Containers (10) eine Vibratorvorrichtung anzubringen. Weiterhin wird ein Schlamm-Entwässerungsverfahren vorgeschlagen, wobei das abgeschiedene Wasser zur Reinigung der Filtertafel (20) verwendet wird.
Abstract:
Aus dem zu entwässernden Schlamm wird ein Schlammgebilde bestehend aus Schlammschichten (2, 3, 4) und zwischen diesen angeordneten Transmissivitätspaketen (6) gebildet. Dieses Schichtgebilde wird durch ein Gewicht (5) belastet. Die einzelnen Transmissivitätspakete (6) bestehen aus einer Entwässerungslage und auf beiden Seiten derselben angeordneten Filterlagen, welche ein Eindringen von Feststoffpartikeln in die Entwässerungslage verhindern. Das durch die Gewichtsbelastung aus den Schlammschichten (2, 3, 4) herausgepresste Wasser gelangt in die Entwässerungslagen, durch die es seitlich austreten kann.