Filter for rapid purification of water

Tamada, Masao; Takeda, Toshihide*

Glycidyl methacrylate (GMA) was grafted onto -irradiated polyethylene nonwoven fabric which has low leaching of total organic carbon (TOC). The functional group of sulfonic acid was imparted by chemical treatment of grafted fabric. The resulting metal adsorbent removed sodium ion from 10 ppb solution with 400 m/L in linear velocity. This rate is 2000 times faster than that of commercialized adsorbent resins. The breakthrough point was 40,000 in bed volume and the eluted TOC was less than 0.03 ppb. The grafting was carried out by emulsion system to reduce the production cost. As a result, the cost could be reduced into the practical level since suitable dose for grafting was reduced to 50 kGy.