Leaching or solid-liquid extraction is an alternative pretreatment
performed in room temperature. In this technique,
the limonene in the orange peel waste is leached into a solvent
that has contact with the peel [18]. This technique is widely
used to extract organic compounds from natural materials,
where these compounds are present at low concentration.
To the best of our knowledge, this technique has not been
employed for pretreatment of orange peel wastes.Therefore,
the objective of this work was to examine leaching technique
for orange peel waste pretreatment with focus on biogas
production.