The Role of Solvent Soaking and Pretreatment Temperature in Microwave-Assisted Pyrolysis of Waste Tea Powder: Analysis of Products, Synergy, Pyrolysis Index, and Reaction Mechanism

Husam Talib Hamzah, Veluru Sridevi, Meghana Seereddi, Dadi V Suriapparao, Potnuri Ramesh, Chinta Sankar Rao, Ribhu Gautam, Fiyanshu Kaka, Kocherlakota Pritam

Research output: Contribution to journalArticlepeer-review

Abstract

This study focuses on microwave-assisted pyrolysis (MAP) of fresh waste tea powder and torrefied waste tea powder as feedstocks. Solvents including benzene, acetone, and ethanol were used for soaking feedstocks. The feedstock torrefaction temperature (at 150 oC) and solvents soaking enhanced the yields of char (44.2-59.8 wt %) and the oil (39.8-45.3 wt %) in MAP. Co-pyrolysis synergy induced an increase in the yield of gaseous products (4.7-20.1 wt %). The average heating rate varied in the range of 5-25°C/min. The energy consumption in MAP of torrefied feedstock (1386 KJ) significantly decreased compared to fresh (3114 KJ). The pyrolysis index dramatically varied with the solvent soaking in the following order: ethanol (26.7) > benzene (25.6) > no solvent (10) > acetone (6). It shows that solvent soaking plays an important role in the pyrolysis process. The obtained bio-oil was composed of mono-aromatics, poly-aromatics, and oxygenated compounds.
Original languageEnglish (US)
Pages (from-to)127913
JournalBioresource technology
DOIs
StatePublished - Sep 8 2022

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Waste Management and Disposal

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