Catalytic Gasification of Sewage Sludge in Supercritical Water: Influence of K2CO3 and H2O2 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 degrees C, 27 MPa, 6 min), and the separate and combined effects of the catalyst on the H-2 production and phosphorus yield were investigated. The experimental results indicated that K2CO3 alone improved the H-2 yield, gasification efficiency (GE), and carbon gasification efficiency (CE). The largest H-2 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 K2CO3. However, when H2O2 was added, the H-2 yield quickly decreased with increasing H2O2 coefficient, and more than 97.8% of organic phosphorus (OP) was converted into IP. The H-2 yield increased with the addition of various K2CO3/H2O2 ratios, whereas the IP yield decreased.