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. 2020 Feb 14;5(7):3389-3396.
doi: 10.1021/acsomega.9b03608. eCollection 2020 Feb 25.

Catalytic Gasification of Sewage Sludge in Supercritical Water: Influence of K2CO3 and H2O2 on Hydrogen Production and Phosphorus Yield

Weijin Gong  1 , Zizheng Zhou  1 , Yue Liu  1 , Qingyu Wang  1 , Lina Guo  1
Affiliations

Catalytic Gasification of Sewage Sludge in Supercritical Water: Influence of K2CO3 and H2O2 on Hydrogen Production and Phosphorus Yield

Weijin Gong et al. ACS Omega. .

Abstract

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 H2 production and phosphorus yield were investigated. The experimental results indicated that K2CO3 alone improved the H2 yield, gasification efficiency (GE), and carbon gasification efficiency (CE). The largest H2 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 H2 yield quickly decreased with increasing H2O2 coefficient, and more than 97.8% of organic phosphorus (OP) was converted into IP. The H2 yield increased with the addition of various K2CO3/H2O2 ratios, whereas the IP yield decreased.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Effect of the amount of K2CO3 on the gas and phosphorus yields from the SCWG of sludge at 460 °C and 27 MPa after 6 min: (a) gas yield, (b) GE and carbon gasification efficiency (CE), (C) inorganic phosphorus (IP) and organic phosphorus (OP) yields, and (d) total phosphorus (TP) yield in the liquid sample and solid residue.
Figure 2
Figure 2
Effect of the amount of H2O2 on the gas and phosphorus yields from the SCWG of sludge at 460 °C and 27 MPa after 6 min: (a) gas yield, (b) GE and CE, (C) IP and OP yields, and (d) TP yield in the liquid production and solid residue.
Figure 3
Figure 3
Effect of the ratio of K2CO3 to H2O2 on the gas and phosphorus yields from the SCWG of sludge at 460 °C and 27 MPa after 6 min: (a) gas yield, (b) GE and CE, (C) IP and OP yields, and (d) TP yield in the liquid production and solid residue.
See this image and copyright information in PMC

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