Abstract: The invention relates to a method for the accelerated dehydration of sludges in sludge disposal areas, especially of sludges from rivers and harbors, by the exclusive use of anionic polymer flocculants and the use of materials obtained according to the inventive method.

Abstract: The invention relates to a method for the accelerated dehydration of sludges in sludge disposal areas, especially of sludges from rivers and harbors, by the exclusive use of anionic polymer flocculants and the use of materials obtained according to the inventive method.

Abstract: This invention provides a dried singulated cellulose pulp fiber product as well as an apparatus and a method for forming singulated and dried fibers. In accordance with the process a feed pulp is delivered to a jet drier. The jet drier singulates and dries the feed pulp. The singulated and dried fibers are collected from the jet drier. The feed pulp may be treated with a treatment substance. The jet drier may be maintained at negative pressure. The product fibers may have low knot count, a low fines count, as well improved kink, curl and twist. The apparatus for carrying out the process may include a pretreatment station for supplying the treatment substance, a pulp feed device designed for pulp, a pulp feed device designed for pulp and foam suspensions, and/or a fiber separation station having a vacuum conveyor.

Abstract: This invention provides a dried singulated cellulose pulp fiber product as well as an apparatus and a method for forming singulated and dried fibers. In accordance with the process a feed pulp is delivered to a jet drier. The jet drier singulates and dries the feed pulp. The singulated and dried fibers are collected from the jet drier. The feed pulp may be treated with a treatment substance. The jet drier may be maintained at negative pressure. The product fibers may have low knot count, a low fines count, as well improved kink, curl and twist. The apparatus for carrying out the process may include a pretreatment station for supplying the treatment substance, a pulp feed device designed for pulp, a pulp feed device designed for pulp and foam suspensions, and/or a fiber separation station having a vacuum conveyor.

Abstract: A process and an apparatus for processing a charge of a solid material under conditions which include high mass flow rate of gas through the apparatus and which produce liquid from the solid material is disclosed. The apparatus includes a vessel having (i) an inlet end having an inlet for supplying the solid material to form a packed bed in the vessel; and (ii) an outlet end having at least one solids outlet, at least one liquids outlet. The apparatus is characterised by the at least one gas outlet being positioned above the solids/liquid outlets.

Abstract: A method and apparatus is provided for continuous dehydration of sludge wherein, prior to dehydration, water is mechanically removed from the sludge, and the thus obtained sludge of cutting consistency is mixed with heated spheres. Dehydration is carried out at reduced pressure, wherein the sludge from which water has been mechanically removed is intimately mixed with the heated spheres in order to increase the heat capacity of the sludge. The dehydrated sludge and the cooled spheres are then separated from each other, the dehydrated sludge is removed, while the cooled spheres are reheated and subsequently added to fresh sludge that is to be dehydrated. The spheres are partly heated by means of water vapor coming from the sludge and partly by means of steam. The spheres are made from steel, having a diameter of 8-16 mm. The pressure in the system ranges form approx. 2 bars to approx. 0.05 bar. An apparatus is also provided for carrying out the method.

Abstract: An apparatus for drying solid and liquified products using heating gas and a plurality of spherical balls having contacting surfaces. A drying chamber is established between a housing and a central body which is coaxially positioned through the center of the housing. Located within the drying chamber are a plurality of balls which form a drying bed. A screw auger is coaxially positioned through the center of the central body to circulate the balls through the drying chamber by moving them from the bottom to the top of the drying chamber where they are redeposited into the bed. A rotatable balls dispersing chute is coupled to the screw auger at the upper end of the central body to evenly distribute balls over the top of the bed of balls as it rotates.

Abstract: A method of maximizing net water loss from various sludges in the outdoor environment to stabilize or to reduce the volume and weight of sludges. Specifically, this method comprises drying a layer of wet sludge by surface evaporation, mixing a sufficient amount of additional wet sludge to the previously-dried sludge layer to form a sludge mixture having a water content at which surface evaporation is maximized, and drying the sludge mixture by surface evaporation or by periodical tilling or both. Additionally, the sludge surface is sealed by light compaction in the event of imminent precipitation to minimize rainwater retention and infiltration. In addition to stabilization, this method may be used as an effective pretreatment step towards other sludge treatment processes to drastically reduce the sludge treatment cost, based on the reduction of the sludge volume, sludge weight, and sludge water content.