Two-stage liquefaction of sewage sludge in methanol-water mixed solvents with low-medium temperature
Two-stage liquefaction of sewage sludge in methanol-water mixed solvents with low-medium temperature
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甲醇-水混合溶剂低中温两段液化污泥
DOI：
10.1016/j.supflu.2020.105094
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发表时间：
2021-02
期刊：
影响因子：
--
通讯作者：
Rundong Li
中科院分区：
文献类型：
--
作者：
Tong Yao;Tianhua Yang;Bingshuo Li;Xingping Kai;Rundong Li
• Low-medium temperature continuous HTL of sludge in methanol-water co-solvent. • Prolonging the reaction time at low temperature can increase the yield of bio-oil. • Two-stage liquefaction reduces energy consumption and increases energy recovery. • Two-stage HTL can promote the accumulation of organic matter from aqueous to bio-oil. • Migration and transformation of nitrogen in two-stage HTL process. Hydrothermal liquefaction could be a promising technology to convert sewage sludge into bio-oil for energy recovery. In this study, in order to obtain the maximum yield of bio-oil and improve the energy recovery of sludge, the influence of temperature and residence time on the multi-temperature continuously liquefaction of sludge in methanol-water mixed solvents was investigated. The results showed that the two-stage liquefaction significantly affected the yield, elemental composition, higher heating value, energy recovery and chemical composition of bio-oil. By optimizing the reaction conditions of hydrothermal liquefaction, the maximum utilization of sludge resources was realized. The maximum yield (42.2 %) and ester content (41.8 %) of bio-oil were obtained when the reaction conditions were 260 °C, 40 min for the first stage and 340 °C, 40 min for the second stage. The migration and transformation of nitrogen indicated that nitrogen elements were mainly concentrated in the liquid product and the N-heterocyclic compounds are the main forms of nitrogen in bio-oils.
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