Effect of additives on the distribution of three-phase products of oily sludge subjected to microwave pyrolysis

Abstract

This study aimed to explore the influence of activated carbon, oily sludge pyrolysis residue, and biochar and their contents on the distribution of three-phase products of oily sludge subjected to microwave pyrolysis. A microwave reaction system, refinery gas analyzer, and chromatography-mass spectrometry were used to carry out the experiment and analyze the results. The results showed that all three additives reduced the yield of solid products and increased the yield of gas products. With an increase in the additive content, the volatile matter and moisture content in the pyrolysis residue greatly reduced. The content of CH₄ and H₂ in the pyrolysis gas increased with an increase in the additive content. When the amount of activated carbon was 20%, the H₂ content reached a maximum (39.7%), and when the amount of biochar was 20%, the CH₄ content reached a maximum (44.5%). All three additives increased the content of small molecules in the pyrolysis oil; when 10% activated carbon was added, the oil recovery rate reached up to 78.5%. The results of this study can guide the industrial application of microwave pyrolysis oily sludge.

Keywords:

• Additive
• microwave pyrolysis
• oily sludge
• oil recovery

Data availability statement

Data sharing is not applicable to this article as no new data were created or analyzed in this study.

Additional information

Funding

The authors gratefully acknowledge the support from the national key research and development program of China(2020YFC1910000) and the Key R&D Plan of Shandong Province, China (2019JZZY020310)