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Author Guidelines

1. Scope

The Journal of Circular Environmental Infrastructure and Systems (CIRCULAR) publishes original scholarly works in the fields of environmental engineering and related disciplines, with particular emphasis on sustainable environmental systems, circular economy, life cycle thinking, resource efficiency, and environmental technologies.

The journal welcomes manuscripts covering, but not limited to, the following areas:

1. Circular Environmental Systems Engineering
2. Water Treatment Technology
3. Waste and Material Management Technology
4. Air Quality and Emission Control
5. Renewable Energy and Bioenergy
6. Sustainable Infrastructure and Settlements
7. Environmental Policy and Management
8. Climate Change Adaptation and Mitigation
9. Islamic Environmental Ethics and Sustainability
10. Social Innovation and Appropriate Environmental Technology

Submitted manuscripts must demonstrate originality, scientific rigor, and significant contribution to the advancement of environmental engineering and sustainable development.

2. Types of Manuscripts

CIRCULAR accepts the following categories of manuscripts:

• Original Research Articles

Original research articles presenting novel scientific findings, methodological developments, technological innovations, or applied research within the journal's scope.

• Review Articles

Critical review articles that synthesize recent scientific developments, identify research gaps, and provide recommendations for future research.

3. General Manuscript Requirements

Authors are requested to ensure that manuscripts comply with the following requirements:

• The manuscript has not been previously published and is not under consideration by another journal.
• The manuscript is written in English.
• The manuscript follows the official CIRCULAR Manuscript Template.
• Manuscripts should normally contain 6,000–8,000 words, including references.
• Manuscripts must be submitted in Microsoft Word (.doc or .docx) format.
• Authors are encouraged to register and provide their ORCID iD.
• Authors must submit one complete manuscript using the official CIRCULAR template. Before peer review, the editorial team will remove author-identifying information from the manuscript and its document properties. Reviewers will receive only the anonymized version. Authors must avoid including identifying information in acknowledgements or other parts of the manuscript that could compromise anonymity.
• The editorial team may request additional statements or supporting documents regarding funding, conflicts of interest, author contributions, data availability, and research ethics, as applicable to the submitted manuscript. Authors must provide accurate information when requested. Relevant declarations may be incorporated into the published article when necessary.

4. Manuscript Structure

The manuscript should be organized in the following order:

1. Title
2. Author(s) Information
3. Institutional Affiliation(s)
4. Corresponding Author
5. Abstract
6. Keywords
7. Introduction
8. Materials and Methods (or Research Methodology)
9. Results and Discussion
10. Conclusion
11. Acknowledgements (optional)
12. References

The title should be concise, informative, and preferably not exceed 15 words.

The abstract should contain approximately 150–250 words and briefly present the background, objectives, methodology, principal findings, and conclusions.

Provide 3–5 keywords representing the main topics of the manuscript.

5. Manuscript Formatting

Authors must prepare manuscripts using the official CIRCULAR manuscript template.

General formatting requirements include:

1. Font: Leelawade UI
2. Font Size: 11 pt
3. Line Spacing: 1.15
4. Text Alignment: Justified
5. Tables and figures must be numbered consecutively and cited within the text.
6. All figures should have sufficient resolution and be accompanied by appropriate captions.
7. Mathematical equations should be editable and sequentially numbered where applicable.

Authors are advised not to modify the overall formatting style provided in the journal template.

6. References

CIRCULAR adopts the IEEE (Institute of Electrical and Electronics Engineers) citation and referencing style.

Authors should ensure that:

• References are relevant, accurate, and up to date.
• A minimum of 15 references is required.
• At least 70% of the references should be from peer-reviewed journal articles published within the last 10 years.
• Every reference cited in the manuscript must appear in the reference list, and every item in the reference list must be cited in the text.
• References should include DOI information whenever available.
• In-text citations should be presented using sequential Arabic numerals in square brackets, for example: [1], [2], or [3]–[5].
• The reference list must be arranged in the order of citation rather than alphabetically.

Authors are strongly encouraged to use reference management software such as:

• Mendeley
• Zotero
• EndNote

Reference Examples (IEEE Style)

Journal Article

[1] C. D. Adhani and J. Smith, "Circular economy implementation in wastewater treatment systems," Journal of Circular Environmental Infrastructure and Systems, vol. 1, no. 1, pp. 1–15, 2026, doi: xx.xxxx/xxxxx.

Book

[2] United Nations, The Sustainable Development Goals Report 2023. New York, NY, USA: United Nations, 2023.

Conference Proceedings

[3] A. Rahman and B. Lee, "Life cycle assessment for sustainable water treatment," in Proceedings of the International Conference on Environmental Engineering, Kuala Lumpur, Malaysia, 2024, pp. 45–52.

Website

[4] United Nations Environment Programme, "Global Environment Outlook," https://www.unep.org/, accessed Jun. 30, 2026.

Authors are responsible for ensuring that all references are formatted according to the IEEE referencing style. Manuscripts with improperly formatted citations and references may be returned for technical revision prior to peer review.

7. Supplementary Files

Authors are encouraged to upload supplementary materials that enhance the transparency and reproducibility of their research.

Examples include:

• Research datasets
• Survey questionnaires
• Experimental protocols
• Calculation spreadsheets
• Additional tables or figures
• Computer codes or software scripts
• Multimedia files supporting the research

Supplementary files should be clearly labeled and referenced within the manuscript where appropriate.

8. Submission Procedure

All manuscripts must be submitted electronically through the Open Journal Systems (OJS) platform.

Authors are required to:

1. Register for an account and log in to the journal system.

2. Complete all required submission metadata.

3. Upload the complete manuscript using the official CIRCULAR template, along with any supplementary files, if applicable.

4. Review and confirm the submission.

The corresponding author will receive a confirmation after successful submission.

Submission Preparation Checklist

As part of the submission process, authors are required to check off their submission's compliance with all of the following items, and submissions may be returned to authors that do not adhere to these guidelines.

1. The submitted manuscript is original, has not been previously published, and is not currently under consideration by another journal.
2. The manuscript has been prepared using the official CIRCULAR manuscript template and complies with the journal's formatting requirements.
3. The submission file is in Microsoft Word format (.doc or .docx).
4. References have been formatted according to the IEEE citation style, and DOI or URL information has been provided where available.
5. All required metadata (title, abstract, keywords, author information, and affiliations) have been accurately entered into the online submission system.
6. Tables, figures, and supplementary files (if any) have been properly prepared, numbered, and cited within the manuscript.
7. The author has read and agrees to comply with the Author Guidelines, Publication Ethics, Copyright Notice, and Privacy Statement of CIRCULAR.

Copyright Notice

Authors who publish in the Journal of Circular Environmental Infrastructure and Systems (CIRCULAR) agree to the following terms:

1. Copyright of the published article remains with the author(s).
2. The author(s) grant CIRCULAR the right of first publication, with the work simultaneously licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits unrestricted use, distribution, adaptation, and reproduction in any medium, provided that the original work is properly cited.
3. Authors are permitted to distribute the published version of the article (for example, through institutional repositories, personal websites, or academic social networking platforms), provided that appropriate acknowledgment is given to its initial publication in CIRCULAR.
4. Authors warrant that the submitted manuscript is original, has not been published previously, is not under consideration elsewhere, and does not infringe upon the copyright or other intellectual property rights of any third party.
5. Authors are responsible for obtaining permission to reproduce any copyrighted material included in their manuscripts where necessary.

Privacy Statement

The names, affiliations, email addresses, and other personal information entered into this journal website will be used exclusively for the purposes of the Journal of Circular Environmental Infrastructure and Systems (CIRCULAR) and will not be made available for any other purpose or to any third party, except where required by law or for legitimate scholarly publishing purposes.

CIRCULAR is committed to protecting the privacy, confidentiality, and security of personal information belonging to authors, reviewers, editors, and readers in accordance with internationally recognized publication ethics and applicable data protection principles.

The information collected through the Open Journal Systems (OJS) platform is used solely for the following purposes:

• Managing manuscript submission, editorial, and peer review processes;
• Communicating with authors, reviewers, and editors regarding manuscript processing and publication;
• Publishing accepted scholarly articles;
• Supporting indexing, archiving, metadata dissemination, and long-term preservation of published content;
• Improving the quality and administration of the journal.

CIRCULAR does not sell, trade, rent, or otherwise disclose users' personal information for commercial purposes.

By registering an account and using this journal website, users acknowledge and consent to the collection, processing, and use of their personal information as described in this Privacy Statement.