| 摘要 |
<p>PURPOSE:To prevent the generation of pollution and to provide the filter medium made of inexpensive carbon by effectively utilizing paper sludge which is a waste material. CONSTITUTION:This filter medium 1 consists of the paper sludge which is formed by dehydrating the paper sludge in the state of being generated in a paper making process to about 30 to 50% moisture content, a carbonization assisting material consisting of, for example, a mixted solution composed of phosphoric acid and calcium chloride, potassium permanganate, or a mixted solution composed of the potassium permanganate and cobalt chloride, etc., and clay which burns and solidifies at a temp. lower than the temp. at which carbon burns. The above-mentioned filter medium is formed by kneading the paper sludge, the carbonization assisting material and the clay and burning and solidifying the kneaded mixture at about the temp. at which the carbon does not burn.</p> |
