Catalytic Gasification of Sewage Sludge in Supercritical Water: Influence of KCO and HO on Hydrogen Production and Phosphorus Yield.

In this work, the catalytic gasification of sewage sludge in supercritical water was investigated in a batch reactor (460 °C, 27 MPa, 6 min), and the separate and combined effects of the catalyst on the H production and phosphorus yield were investigated. The experimental results indicated that KCO alone improved the H yield, gasification efficiency (GE), and carbon gasification efficiency (CE). The largest H yield of 54.28 mol/kg was achieved, which was approximately three times that without a catalyst. Furthermore, the inorganic phosphorus (IP) yield increased with the addition of KCO. However, when HO was added, the H yield quickly decreased with increasing HO coefficient, and more than 97.8% of organic phosphorus (OP) was converted into IP. The H yield increased with the addition of various KCO/HO ratios, whereas the IP yield decreased.