水热碳化
污水污泥
燃烧热
碳化
水溶液
碳纤维
能量回收
热液循环
材料科学
双水相体系
化学工程
制浆造纸工业
废物管理
化学
燃烧
环境科学
污水
环境工程
吸附
有机化学
复合材料
统计
数学
复合数
能量(信号处理)
工程类
作者
A.S. Oliveira,Andrés Sarrión,J.A. Baeza,Elena Díaz,L. Calvo,A.F. Mohedano,Miguel Á. Gilarranz
标识
DOI:10.1016/j.cej.2022.136301
摘要
This study investigates the energy recovery from sewage sludge by combining hydrothermal carbonization and aqueous phase reforming of the generated process water. The hydrothermal treatment was carried out at 170 °C and 230 °C for 1 h, and produced a hydrochar with adequate physicochemical properties, such as a higher heating value (20–24 MJ kg−1) than sludge, improved fuel ratio (0.2–0.5) and a broad comprehensive combustion index (5.8 × 10−7 to 10.0 × 10−7 min−2 °C−3). Aqueous phase reforming of the process water was carried out at 220 °C and 25–29 bar for 4 h. A maximum H2 yield of 98.7 mmol H2 gTOC−1 was achieved using a bimetallic Pt/Rh catalyst supported on carbon black and for the process water obtained at the lowest carbonization temperature. The integration of hydrothermal carbonization and aqueous phase reforming processes is an interesting alternative for the management and energy recovery of sewage sludge, which allows reaching a potential energy recovery of 17.3 MJ per kg of dry sewage sludge, equivalent to 93.5 % gross energy recovery, under optimized conditions.
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