Method and apparatus for working up a sample of liquid

摘要

PCT No. PCT/FI96/00301 Sec. 371 Date Dec. 22, 1997 Sec. 102(e) Date Dec. 22, 1997 PCT Filed May 28, 1996 PCT Pub. No. WO96/38719 PCT Pub. Date Dec. 5, 1996A method and apparatus act on a sample liquid of a pulp and paper industry process water, such as a pulp slurry or white water. The sample is acted upon in an apparatus including sample flow chamber, a filtrate flow chamber, and a filter connecting the sample flow chamber with the filtrate flow chamber. A flow sample liquid, including solid substances such as fibers and filler materials (as well as dissolved and colloidal substances) is introduced through an inlet into the sample flow chamber. A main flow of the sample liquid is discharged through an outlet. A flow of filtrate is passed through a filter from the sample flow chamber into the filter flow chamber, thereby separating a predetermined fraction of solid substance from a minor portion of the introduced flow of sample liquid, in the filter. The minor portion of sample liquid corresponds to less than 1%, typically less than 0.1%, of the total introduced flow of sample liquid. A mat of solid substances is prevented from building up on the inlet side of the filter by inducing in the sample flow chamber turbulence or a high flow velocity of sample liquid adjacent the filter.