PURPOSE: To prepare an active chaff having increased surface area and adsorption ability from chaff and to utilize the active chaff for water cleaning treatment by adding an inorg. acid and/or an alkali to carbonized chaff or silver white color chaff, heating it, thereafter filtering and drying.
CONSTITUTION: An aq. soln. of an inorg. acid (such as hydrochloric acid) and/or an alkali (such as sodium hydroxide) are (or) are added to carbonized chaff or silver white color chaff, and the added substance is heated, thereafter filtered and dried. For example, a 10% aq. soln. of hydrochloric acid is added to the carbonized chaff, which is heated under reflux, and thereafter cooled to the normal temp. The surface area of the active carbonized chaff is 114 m2/g, which is prepared by washing the content with water, neutralizing with an aq. NaOH soln., thereafter further washing with water, filtering and drying. As a result, the active chaff having increased surface area and adsorption ability can be prepared from chaff. Various toxic contaminating substances dissolved in water can be removed by using the active chaff.
SO TADAYOSHI
TEI SANSEI
| JPS5781880A | 1982-05-22 |