초록 ▼

An aqueous slurry containing dissolved solids and a high concentration of suspended solids is positioned as a mat between a pair of porous endless belts to provide a composite structure. The composite structure is moved through a treating zone and subjected to alternate stages of compression and rel

An aqueous slurry containing dissolved solids and a high concentration of suspended solids is positioned as a mat between a pair of porous endless belts to provide a composite structure. The composite structure is moved through a treating zone and subjected to alternate stages of compression and relaxation. In a preferred mode, the compression and relaxation are achieved by passing the composite structure over a series of spaced rolls in a manner such that a first belt of the pair is in direct contact with one of the rolls and a second belt of the pair is in contact with the next adjacent roll. A liquid stream containing a high concentration of dissolved solids is cascaded over the mat in a countercurrent fashion, with the result that dissolved solids of the liquid stream are dissolved in the aqueous phase of the mat when the mat is subject to relaxation. The mat containing the increased concentration of dissolved solids and suspended solids can then be compacted and the solid residue can be landfilled. The liquid stream being discharged from the treating zone and containing a depleted concentration of dissolved solids can then be recirculated for use in a paper-making or pulp processing operation.

대표청구항 ▼

[ I claim:] [1.]1. A method of treating a liquid slurry comprising the steps of positioning a mat having a liquid phase and containing material selected from the group consisting of dissolved solids, suspended solids and mixtures thereof comprising solid contaminants between a pair of porous endless

[ I claim:] [1.]1. A method of treating a liquid slurry comprising the steps of positioning a mat having a liquid phase and containing material selected from the group consisting of dissolved solids, suspended solids and mixtures thereof comprising solid contaminants between a pair of porous endless belts to provide a composite structure, moving the composite structure through a treating zone and subjecting the mat to alternate stages of compression and relaxation, passing a liquid stream containing a substance selected from the group consisting of dissolved solids, suspended solids, and mixtures thereof comprising solid contaminants through the treating zone countercurrently to the direction of movement of said composite structure through said zone, to cause said liquid stream to impregnate the mat when the mat is subjected to relaxation and transfer said substance to the liquid phase of the mat, and removing the mat from said belts.