Activated carbon by pyrolysis of sludge from pulp-mill waste-water treatment

Abstract

Feasibility of production of activated carbon from sludge of CGP (chemi-ground pulp) wastewater was studied by means of laboratory-scale experiments. In this work, alum (Al2(SO4)3·18H2O) was used as coagulating agent. The main carbonizing and activating agent used was ZnCI2, and K2S was also used for comparison. The quality of carbons obtained was examined with reference to yield, specific surface area, pore volume and pore size distribution. The influence of activation conditions, such as weight ratio of sludge to ZnCl2, activation temperature and drying time, to the development of pore structure is discussed. © 1980, The Society of Chemical Engineers, Japan. All rights reserved.