Facilitization slurry settling

Inclined plate clarification is a traditional separation technology that has been used for decades to remove suspended solids from a liquid stream in various types of systems including traditional precipitation [12]. In the semiconductor industry, the clarifier is commonly used in fluoride waste treatment systems where calcium fluoride precipitate is concentrated prior to dewatering in a press, or in assembly/test operations to separate silicon fines from backgrind operations. The clarifier will concentrate the solid phase of slurry like a UF, but unlike the UF or MF, the clarifier may require the addition of a chemical polymer to facilitate the agglomeration of the suspended solids so that they settle and concentrate. Polymer addition adds another level of complexity to the waste treatment system. The clarifier does not provide a physical barrier to prevent the transport of solids to downstream equipment, so it may be necessary to install a UF or MF downstream of the clarifier to capture extraneous particles or to protect the downstream equipment from clarifier upsets. 

Clamp a column (approximately 1.5 cm x 40 cm) to a stand, and with the outlet closed run a small volume of PBS into the column. Pour the Sephadex G-50 suspension into the colunm and allow to settle until approximately 1 cm of column length is filled. Open the outlet to allow a flow of PBS, which facilitates column packing. Add more Sephadex slurry to give a packed volume of one-third of the column length, with a reasonable depth of PBS above the packed Sephadex. Close the outlet. 

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