| 摘要 |
PURPOSE: To conduct stabilized high-precision filtration and to realize filtration excellent in economy and operability by forming the filtration bag consisting of plain or twill fabric of a highly non-adhesive synthetic resin monofilament yarn. CONSTITUTION: This filter is useful to produce city water, etc. This filtration bag as the filter bed especially of a continuous flocculating, filtering separation tank is formed by sewing a single layer net of plain fabric having about 40μm meshes with the monofilament yarn of non-adhesive synthetic resin PFA as a weaving thread obtained by impregnating a glass thread with PTFE and baking the impregnated thread. When raw water is filtered, aluminum polychloride, sodium polyacrylate, etc., are added, and rapid agitation and then slow agitation are applied to impart a pressure increase equivalent to the weight of the injected flocculated raw water. Consequently, the flocculated raw water in the bag is discharged outside the bag from the filtration hole of the texture, and continuous filtration is performed without being interrupted due to the clogging of the filtration hole.
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