PURPOSE: To separate and remove ionic and colloidal actinide elements in a radioactive waste water by using a sandwich-shaped adsorptive filtration film composed of a laminar body of a specified thickness, which is made of tannin- fixed cellulose powder, and two sheets of filter paper, filtration membranes made of cellulose, which hold both faces of the laminar body.
CONSTITUTION: An adsorptive filtration film is produced by forming tannin-fixed cellulose powder into a laminar body of 1 to 10mm in thickness and then by making two sheets of filter paper, filtration membranes made of cellulose, hold both faces of the laminar body. The tannin-fixed cellulose powder, which is a main constituent of this filtration film, is obtained by dipping cellulose powder in a solution of about 25% NaOH for about 30min so as to form alkali cellulose, then by bringing it into contact with epichlorohydrin, hexamethylenediamine and again epichlorohydrin in order for about 30 to 120min respectively, and finally by bringing it into contact with a tannin solution for about 2 to 24hr. As the tannin, both hydrolysis-type tannin and condensation-type tannin are usable. It is possible, by using this method, to give the film two functions, adsorptivity and filterability.
SHIRATO WATARU
FUJIWARA NOBORU
JP63278515U | ||||
JPS6316812U | 1988-02-04 | |||
JPS61149078A | 1986-07-07 | |||
JPS5752357A | 1982-03-27 |