Rensselaer Republican, Volume 23, Number 21, Rensselaer, Jasper County, 22 January 1891 — Sawdust Filters. [ARTICLE]

Sawdust Filters.

Carbonized sawdust, saturated with certain chemical compounds, bus recently been introduced into German; is a material for filtering and at the sme time discoloring liquids. Sawdust treated first with alum, and then with sodium carbonate, becomes Impregnated with a precipitated aluminum bydrate which adheres firmly to ii After being well washed with a solutio. »f barium chloride until no precib late is given, the sodium sulphate sin ultaneously produced is entirely tvmoved, and then prepared sawduis ready for use. Colored liquid filtered with it have their col ) Botirely removed by the formation V Hakes with the aluminum hvdrati present In the filtering material, A sawdust similarly saturated with t!x barium chloride U used filtering lit; aids, from which it is required "to r move calcium sulphate, and for th removal of calcium carbonate from :t solution a sawdust that has been trea* sd with magnesium sulphate and caustic loda is employed. At the conc.ti.o * chiefs o! fire departments, at hd.vardsvillu Wednesday. E. W. tiarlcman, of J’oJo, was elected president.