Journal Pre-proofs Biogas production from palm oil mill effluent and empty fruit bunches by cou- pled liquid and solid-state anaerobic digestion Wantanasak Suksong, Wisarut Tukanghan, Kanathip Promnuan, Prawit Kongjan, Alissara Reungsang, Heribert Insam, Sompong O-Thong PII: S0960-8524(19)31534-2 DOI: https://doi.org/10.1016/j.biortech.2019.122304 Reference: BITE 122304 To appear in: Bioresource Technology Received Date: 24 September 2019 Revised Date: 17 October 2019 Accepted Date: 18 October 2019 Please cite this article as: Suksong, W., Tukanghan, W., Promnuan, K., Kongjan, P., Reungsang, A., Insam, H., O- Thong, S., Biogas production from palm oil mill effluent and empty fruit bunches by coupled liquid and solid-state anaerobic digestion, Bioresource Technology (2019), doi: https://doi.org/10.1016/j.biortech.2019.122304 This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2019 Elsevier Ltd. All rights reserved.