Method of decontaminating liquid wastes

Purpose: To regenerate water from boron-containing decontaminating liquid wastes at such a quality capable of re-using as processing water and remarkably decrease the generation amount of wastes. Methods: Silica in boron-containing liquid wastes can not be removed by a reversed osmotic process. Then, chemical materials other than silica in the boron-containing decontaminating liquid wastes are removed by the reversed osmotic process and silica is removed with inorganic adsorbents. The reversed osmotic process and the inorganic adsorbent process may be conducted in any optional order. Inorganic oxide type material is used as the inorganic adsorbent and the reverse osmotic membranes usable in the reversed osmosis can include, for example, cellulose acetate membrane and high molecular compound membrane. The thus treated decontaminating liquid wastes can be re-used as processing water, while on the other hand, separated liquid concentrates are solidified to thereby greatly reduce the amount of wastes. (Takahashi, M.)