(57) A liquor, which may contain heavy metal species, is passed along a pipeline (14)
provided with a cascade of fluidic mixing devices (A, B, C D) and a reagent or reagents
is/are combined and thoroughly mixed with the liquor via the fluidic mixing devices
(A, B, C, D) . A pipeline section is disposed downstream of each mixing device (A,
B, C, D) and the pipeline section is dimensioned so that the liquor and reagent(s)
are afforded to residence time for reaction as they flow through it. Following passage
through the cascade of mixing devices (A, B, C, D) the mixed liquor/reagent(s) are
fed into a settling vessel (30) from which part of the contents is fed to a centrifugal
separator (42) to effect liquid/solid separation. A proportion of the solid separated
is recycled back to the cascaded mixing pipeline (14) to provide nuclei to enhance
precipitation and/or increase concentration of a constituent, such as a floc-forming
agent, used in the treatment of the liquor.
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