도시하수 슬러지를 이용한 수처리용 활성탄 제조

Abstract

Carbonization of sewage sludge was estimated by several factors such as activation time and activation temperature in this study. Also, the characteristics of the product was investigated to apply for the treatment of water as activated carbon. The property of activated carbon such as Iodine number and Methylene Blue was not sufficient for commercialized product, but the adsorption capacity was avaliable for the organics. The optimum carbonization of sewage sludge was achieved at 700℃ for 30 min in the nitrogen atmosphere. Carbonized sludge had 76.8% of ash content and fixed carbon was taken 98.7% of non-ash content. So, it is needed to remove the inorganic constituent to use for the treatment of sewage. Inorganic matter elements, Cd concentration was existed 78.5% of the initial value in the carbonized product, while Hg was not detected. The other heavy metals like Pb, Cu, As, and Cr were not vaporized into the atmosphere and were still existed in the product. The leaching test for carbonized sludge showed below the level of Korean Standard for the Hazardous Waste for heavy metals. According to the results of SEM analysis, sufficient micropore was apparently developed as much as being able to use as bio-carrier of activated sludge process for sewage. In addition, heavy metals can be effectively by the adsorption of carbonized sludge of which equilibrium was achieved within 1hr.