厕所粪便与粗甘油共液化制备生物原油研究

Translated title of the contribution: Biocrude oil production via co-liquefaction of toilet feces and crude glycerol

Yingxian Wang, Xiangyang Wu, Meng Wang, Jianwen Lu, Yuanhui Zhang, Zhidan Liu

Research output: Contribution to journalArticle

Abstract

Hydrothermal liquefaction (HTL) is a kind of technology that can convert wet organic waste into energy. Toilet feces contain many pathogens, which can cause pollution to groundwater. Crude glycerol is a byproduct in the process of bio-diesel production. The rational utilization of crude glycerol is of great importance to reduce the cost and mitigate the environmental pollution in large-scale bio-diesel production. By doing this, we can achieve the harmless treatment of toilet feces, the reuse of crude glycerol, and energy production. In this study, the toilet feces and crude glycerol were used as the feedstock for biocrude oil production via hydrothermal liquefaction (HTL). The effects of different mass ratios of toilet feces to crude glycerol (1:0, 3:1, 2:1, 1:1, 1:2, 1:3, 0:1) on the liquefaction products (biocrude oil, aqueous phase, solid residue and gas) yield, liquefaction rate, energy recovery rate and biocrude oil properties were investigated at the optimal reaction condition (reaction temperature: 340℃, retention time: 10 min, and total solid: 25%) from the previous study. The highest biocrude oil yield of 40.6% reached under the mass ratio of toilet feces to crude glycerol 1:3, increased by 18% compared with using feces only. Meanwhile, the highest liquefaction rate was 94.8%, increased by 15%. Crude glycerol had a beneficial effect on the HTL conversion of toilet feces. This was due to the methanol and organic acids in crude glycerol, which could promote the formation of biocrude oil during HTL. The high heating value (HHV) of biocrude oil was 40.29 MJ/kg, increased by 97.8% compared with toilet feces. However, adding crude glycerol to the toilet feces had little effect on the HHV of biocrude oil. The lowest water content in biocrude oil was 0.23% under the mass ratio of toilet feces to crude glycerol 1:2. Gas chromatograph-mass spectrometer (GC-MS) was performed to understand the composition of biocrude oil. The hydrocarbons contents of biocrude were increased after adding crude glycerol to the toilet feces. The acids in biocrude oil were decreased significantly (26%-44%), indicating that the biocrude oil was more stable. However, the content of nitrogen-containing compounds in biocrude oil increased after adding crude glycerol indicated that denitrogenation was required before the biocrude oil using as the transport fuel. A thermal gravimetric analyzer (TGA) was used to simulate the distribution of boiling points in biocrude oil. The increase of the light fraction and the reduction of the residue fraction of toilet feces biocrude oil after adding crude glycerol indicated that crude glycerol could improve the quality of toilet feces biocrude oil via HTL. In addition, the energy recovery rate was 85% under the mass ratio of toilet feces and crude glycerol 1:3. It was 25% higher than that of using toilet feces only. From the perspective of environment and energy, adding crude glycerol to toilet waste during the HTL process is expected to be an effective way to solve the toilet feces problem.

Translated title of the contributionBiocrude oil production via co-liquefaction of toilet feces and crude glycerol
Original languageChinese
Pages (from-to)181-186
Number of pages6
JournalNongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
Volume35
Issue number22
DOIs
StatePublished - Nov 15 2019

Keywords

  • Biocrude oil
  • Crude glycerol
  • Hydrothermal liquefaction
  • Manures
  • Wastes

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Biocrude oil production via co-liquefaction of toilet feces and crude glycerol'. Together they form a unique fingerprint.

  • Cite this