Characteristics on Carbonization and Steam Activation of Sewage Sludge

Abstract

A number of methods are presented to treat sewage sludge. However, the sludge treated in each treatment process has a problem of heavy metal elution. Currently, the treatment of sewage sludge through carbonization is highlighted to solve such problem. This study carried out research of optimum carbonization and activation condition and analysis of adsorption characteristics in order to treat sewage sludge through carbonization and steam activation and to cycle it as activated carbon. The optimum carbonization and activation conditions were achieved through variable studies and based on iodine adsorptivity. In addition, an analysis was performed with nitrogen adsorption and a SEM to confirm adsorption characteristics and pore development. The results showed that the adsorption capacity of activated derived from sewage (hereinafter referred to as "activated carbon") is improved and porosity is formed through carbonization and steam activation. In particular, micropore is mostly developed by steam activation.

Effect of the Carbonization and Activation Process on the Adsorption Capacity of Rice Husk Activated Carbon

“…2. This was not only because the main reaction of carbonization was actively proceeded with the increase of carbonization temperature, but also because RH showed the reduction of adsorption characteristics due to the contraction and sintering of char at high temperatures [13] (above 500 o C). Therefore, the temperature condition at 500 o C was chosen to produce char which was used as feedstock for activation process to increase the efficiency of carbonization process.…”