Peer review declaration

All papers published in this volume of IOP Conference series: Earth and Environmental Science have been peer reviewed through processes administrated by the Editors. Reviews were conducted by expert referees to the professional and scientific standars expected of a proceedings journal published by IOP Publishing. • Type of peer review : Single-blind • Conference submission management system : Google Form • Number of submissions received : 106 • Number of submissions sent for review : 92 • Number of submissions accepted : 62 • Acceptance Rate (Number of Submissions Accepted / Number of Submissions Received X 100) : 58 % • Average number of reviews per paper : 2 • Total number of reviewers involved : 19 • Any additional info on review process : Review Timeline 1. The manuscripts were send to the guest editors for initial checking, including format, similarity, and language quality 2. After manuscript acceptance by guest editor, the manuscripts were send to the reviewer for substantial evaluation. 3. Among 92 manuscripts that were reviewed, 62 manuscripts were accepted for submitting to IOP. 4. The manuscripts were sent back to the authors 5. The authors sent the manuscripts for confirming the revisions to the guest editor 6. The guest editor checked again the revised manuscript and asked the authors for signing the transfer agreement and answering the editorial comment (if any) 7. The guest editor performed layout, language, and format checked 8. The manuscripts were transferred to IOP 1st round = - Manuscript submission = Dec 1, 2020 – Dec 24, 2020 - Editor check = Dec 24, 2020 – Jan 13, 2021 Manuscripts sent back to authors = Apr 27, 2021 – May 15, 2021 Editor handling = May 15, 2021 – May 31, 2021 The manuscripts are sent to IOP = June 1, 2021 Notes : Single-blind review means that the manuscript is reviewed by one review (peer). Proofread and layout editor are excluded from the definition of “single-blind review” system. • Contact person for queries : Indriyani Rachman, Ph.D. r-indriyani@kitakyu-u.ac.jp Graduate School of Environmental Engineering, The University of Kitakyushu