Fast microwave-assisted catalytic pyrolysis of sewage sludge for bio-oil production

Qinglong Xie, Peng Peng, Shiyu Liu, Min Min, Yanling Cheng, Yiqin Wan, Yun Li, Xiangyang Lin, Yuhuan Liu, Paul Chen, Roger Ruan

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

In this study, fast microwave-assisted catalytic pyrolysis of sewage sludge was investigated for bio-oil production, with HZSM-5 as the catalyst. Pyrolysis temperature and catalyst to feed ratio were examined for their effects on bio-oil yield and composition. Experimental results showed that microwave is an effective heating method for sewage sludge pyrolysis. Temperature has great influence on the pyrolysis process. The maximum bio-oil yield and the lowest proportions of oxygen- and nitrogen-containing compounds in the bio-oil were obtained at 550. °C. The oil yield decreased when catalyst was used, but the proportions of oxygen- and nitrogen-containing compounds were significantly reduced when the catalyst to feed ratio increased from 1:1 to 2:1. Essential mineral elements were concentrated in the bio-char after pyrolysis, which could be used as a soil amendment in place of fertilizer. Results of XRD analyses demonstrated that HZSM-5 catalyst exhibited good stability during the microwave-assisted pyrolysis of sewage sludge.

Original languageEnglish (US)
Pages (from-to)162-168
Number of pages7
JournalBioresource Technology
Volume172
DOIs
StatePublished - Nov 1 2014

Keywords

  • Bio-oil
  • Microwave
  • Pyrolysis
  • Sewage sludge
  • Zeolite

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