Catalytic Gasification of Sewage Sludge in Supercritical Water: Influence of K(2)CO(3) and H(2)O(2) on Hydrogen Production and Phosphorus Yield

[Image: see text] 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(2) production and phosphorus yield were investigated. The experimental results indicated that K(2)CO(3) 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 K(2)CO(3). However, when H(2)O(2) was added, the H(2) yield quickly decreased with increasing H(2)O(2) coefficient, and more than 97.8% of organic phosphorus (OP) was converted into IP. The H(2) yield increased with the addition of various K(2)CO(3)/H(2)O(2) ratios, whereas the IP yield decreased.