Olive oil by-products: From harmful waste to interesting carbonaceous materials : Hydrothermal conversion of olive oil by-products into carbon rich chars

Ahmed Amine Azzaz, Mejdi Jeguirim, Camelia Ghimbeu, Simona Bennici, Lionel Limousy, Mansour Issaoui, Salah Jellali

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


In this paper, four (04) olive oil by-products were used as potential feedstocks for the production of carbon rich materials via hydrothermal carbonization (HTC) process. The raw olive pomace (ROP), Olive mill waste (OMW), Impregnated ROP (IROP) were introduced into a hydrothermal calorific bomb at different experimental conditions. The effect of carbonization temperature was followed for three different isotherm peaks. Results showed that mass yield decreases with increasing heating temperature. The IROP presented the highest yield of 65% at a carbonization temperature of 180°C. Thermogravimetric analysis on the produced hydrochars depicted a high amount of volatile matter content reaching 85% for OMW carbonization at 220°C. SEM imaging showed a similar pattern for the different hydrochars characterized with the appearance of a spherical-like morphology. FTIR specters emphasized on the amorphous aspect of the produced hydrochars with a significant concentration of acidic and basic surface functional groups.

Original languageEnglish
Title of host publication2019 10th International Renewable Energy Congress, IREC 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728101392
Publication statusPublished - Mar 2019
Externally publishedYes
Event10th International Renewable Energy Congress, IREC 2019 - Sousse, Tunisia
Duration: Mar 26 2019Mar 28 2019

Publication series

Name2019 10th International Renewable Energy Congress, IREC 2019


Conference10th International Renewable Energy Congress, IREC 2019


  • Carbonization
  • Hydrochar
  • Olive oil by-products

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering

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