EUBCE 2024 - Hary DEMEY - Continuous Salt Recovery and Continuous Supercritical Water Gasification of Sewage Sludge

Continuous Salt Recovery and Continuous Supercritical Water Gasification of Sewage Sludge

Short Introductive summary

Hydrogen and methane production from biomasses and wastes is a hot topic that has attracted great interest in the energy transition in the recent years. Hydrothermal gasification (HTG) is a thermochemical process which employs the supercritical conditions of water (T 374 ° C, P 221 bar), in order to convert the organic carbon contained in the wet feedstock into a gaseous phase (which contains CH4, H2, CO and CO2, mainly). In this work, the sewage sludge was treated in our pilot plant for separating the salts previous to the gasification in supercritical water conditions at 600 °C, 250 bar. In order to prevent fouling downstream equipment (such as reactor gasification). The salts separation from the feedstocks before gasification is a critical step. The results of feedstock characterization indicated a high inorganic concentration (30 % w/w), in which phosphorous concentration represents 20-30 %. This valuable element could be valorized after separation

H. Demey, Commissariat à l’Energie Atomique et aux Energies Alternatives, Grenoble, FRANCE
O. Delattre, Commissariat à l’Energie Atomique et aux Energies Alternatives, Grenoble, FRANCE
S. Thiery, Commissariat à l’Energie Atomique et aux Energies Alternatives, Grenoble, FRANCE
S. Quenard, Commissariat à l’Energie Atomique et aux Energies Alternatives, Grenoble, FRANCE
E. Stevenot, Commissariat à l’Energie Atomique et aux Energies Alternatives, Grenoble, FRANCE
S. Juillan-Binard, Commissariat à l’Energie Atomique et aux Energies Alternatives, Grenoble, FRANCE