Maintaining the reactivity of solid-bed filters containing reactive solids for use in water-treatment, analytical processes or for improving the taste of tea or coffee

摘要

The reactivity of the reactive solids in solid-bed water filters is: (a) repeatedly restored by the effects of oxidation, hydrolysis, reduction, microwave-, heat-, IR-, UV-or ionizing-radiation, electric fields and/or precipitation and/or (b) repeatedly regenerated inside or outside a moving or static water-treatment solid-bed filter by separating-off specified compounds. The reactive solid-bed water filters comprise a reactive solid (or solids) on a fiber-containing or exclusively fibrous carrier comprising thin metal wires, metal -rope, -wool or -shavings, fine or coarse metal particles, (in)organic fibers, non-metallic wool, paper wool, strips, textiles, fleeces and the like, the carrier optionally also supporting particulate or waxy sorbents comprising graphite-, coke-, carbon black- or activated carbon-particles,mica, clay, zeolites, ion-exchange resins, humic substances, metal soaps (and the corresponding organic acids), waxes, resins, polyolefins, glass flock, glass- or plastics-vesicules, metal particles and activated carbon-bonded heavy metal particles. The reactive solids contain difficultly-soluble oxides, mixed oxides and hydroxides, (hydrogen) sulfides of Fe, Mn, Cu, Zn or of Group 3 elements, or metal hydrides of platinum metals. Alternatively, the reactive solids take the form of metallizations on the fibrous materials. The specified compounds to be separated-off are sulfides, hydrogen sulfides, polysulfides, hydrogen sulfide, organic-substituted mercaptides, mercaptans, carbon disulfide, thiocarbonates, rhodanides, cyanides, cyanates, di- and tri-thiocarbonates, nitrates, organo-sulfur and -halogen compounds, metalloids and heavy metals.