A method and system for analyzing a liquid sample containing particles of solid matter and the use of such a method and system

Abstract

The invention relates to a method and system for monitoring of particles properties in a stream and the use of such method and system. In particular, the invention concerns sampling of liquids like aqueous suspensions or filtrates that contain solid matter in forest industry, oil and mining industry, as well as in and water treatment, desalination or water reuse processes, and in subsequent measurement of the samples. A sample from a stream of liquid is dyed to stain particles contained in the sample, which is conducted to a first flow chamber (23) having means for causing said sample to be divided into particle populations according to their size or mass. A liquid flow is applied through the first flow chamber to cause at least one particle population to flow into a second flow chamber (24). The particle populations are measured to produce at least one measurement signal representative of the amount and / or properties of the particles, and processing extract key variables of each particle population and presenting them as an analysis of particle populations or the whole sample in terms of a count and size of particles and / or their hydrophobicity.

Description

field of invention [0001] The present invention includes measurement and / or monitoring techniques for industrial liquids containing solid matter. In particular, the present invention relates to the sampling of liquids containing aqueous suspensions or filtrates of solid matter as in the forestry industry, the petroleum and mining industry, and water treatment, desalination or water reuse processes, and subsequent measurement of the samples. In more detail, the present invention relates to on-line analysis methods and systems utilizing fractionation techniques of sample streams. Background of the invention [0002] An example of a notable field where measurement of liquids containing solid matter is required is the forest industry, where wood pulp samples or filtrates need to be monitored, such as, for example, wirewater, white water, thickener filtrate or another similar Pulp filtrate, or circulating water, to be able to control the whole process. As in the petroleum and m...

AI Technical Summary

Problems solved by technology

[0009] But typically the SdFFF system is only able to handle very small sample volumes, which is not suitable for paper mill samples if turbidity is used as the primary detector

A major problem with samples originating from industrial processes, such as paper mill samples, is the presence of fibers, and especially fines, which have a strong tendency to flocculate in the FFF cell and thus clog the cell

This makes sizing challenging as short fibers also trap light particles

[0010] In addition to flocculation, another problem is the mechanical or chemical bonding of substances to each other, as well as stickies and hydrophobic substances to known fractionation systems (especially those based on cross-flow filters or the known FFF technology) surface attachment