인을 제거한 하수슬러지 고형연료의 회분 응집현상 규명

Study on ash agglomeration of sewage sludge solid fuel with phosphorus removed

The amount of sewage sludge continues to increase with expansion of sewage treatment plant. However, Ocean dumping of sewage sludge has been prohibited with the London Protocol for the Prevention of Marine Pollution. Therefore, it is an important issue to treatment of sewage sludge on the ground site. The hydrothermal carbonization technology is one of the attractive solutions to convert the sewage sludge into solid fuel. Unlike coal, sewage sludge solid fuel contains larger quantities of phosphorus. Phosphorus is known as substance that significantly impacts fouling. Fouling is factor that lowers energy efficiency. Therefore, it is important to remove phosphorus for reducing fouling and increasing energy efficiency. In this experiment, sewage sludge solid fuel, which was produced from Incheon city, S.Korea, was used. Citric acid and formic acid was used to dissolve phosphorus in water. Sewage sludge solid fuel mixed in citric and formic solution and stirred. In order to investigate phosphorus removal by citric and formic acid, phosphorus-dissolved solution was analyzed by XRF. As a result, phosphorus removal efficiency of citric acid is higher than formic acid. In order to investigate fouling property of sewage sludge solid fuel with phosphorus removed, muffle furnace experiment and agglomeration test was conducted.