<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE article PUBLIC "-//NLM//DTD Journal Publishing DTD v2.0 20040830//EN" "journalpublishing.dtd"><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" dtd-version="2.0" xml:lang="en" article-type="reviewer-report"><front><journal-meta><journal-id journal-id-type="nlm-ta">JMIRx Med</journal-id><journal-id journal-id-type="publisher-id">xmed</journal-id><journal-id journal-id-type="index">34</journal-id><journal-title>JMIRx Med</journal-title><abbrev-journal-title>JMIRx Med</abbrev-journal-title><issn pub-type="epub">2563-6316</issn><publisher><publisher-name>JMIR Publications</publisher-name><publisher-loc>Toronto, Canada</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">v6i1e69895</article-id><article-id pub-id-type="doi">10.2196/69895</article-id><article-categories><subj-group subj-group-type="heading"><subject>Peer-Review Report</subject></subj-group></article-categories><title-group><article-title>Peer Review of &#x201C;Converting Organic Municipal Solid Waste Into Volatile Fatty Acids and Biogas: Experimental Pilot and Batch Studies With Statistical Analysis&#x201D;</article-title></title-group><contrib-group><contrib contrib-type="author"><collab>Anonymous</collab></contrib></contrib-group><contrib-group><contrib contrib-type="editor"><name name-style="western"><surname>Leung</surname><given-names>Tiffany</given-names></name></contrib></contrib-group><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>4</day><month>2</month><year>2025</year></pub-date><volume>6</volume><elocation-id>e69895</elocation-id><history><date date-type="received"><day>10</day><month>12</month><year>2024</year></date><date date-type="accepted"><day>10</day><month>12</month><year>2024</year></date></history><copyright-statement>&#x00A9; Anonymous. Originally published in JMIRx Med (<ext-link ext-link-type="uri" xlink:href="https://med.jmirx.org">https://med.jmirx.org</ext-link>), 4.2.2025. </copyright-statement><copyright-year>2025</copyright-year><license license-type="open-access" xlink:href="https://creativecommons.org/licenses/by/4.0/"><p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (<ext-link ext-link-type="uri" xlink:href="https://creativecommons.org/licenses/by/4.0/">https://creativecommons.org/licenses/by/4.0/</ext-link>), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIRx Med, is properly cited. The complete bibliographic information, a link to the original publication on <ext-link ext-link-type="uri" xlink:href="https://med.jmirx.org/">https://med.jmirx.org/</ext-link>, as well as this copyright and license information must be included.</p></license><self-uri xlink:type="simple" xlink:href="https://xmed.jmir.org/2025/1/e69895"/><related-article related-article-type="companion" ext-link-type="doi" xlink:href="10.1101/2023.06.21.545938v2" xlink:title="Preprint (bioRxiv)" xlink:type="simple">https://www.biorxiv.org/content/10.1101/2023.06.21.545938v2</related-article><related-article related-article-type="companion" ext-link-type="doi" xlink:href="10.2196/69894" xlink:title="Authors' Response to Peer-Review Reports" xlink:type="simple">https://med.jmirx.org/2025/1/e69894</related-article><related-article related-article-type="companion" ext-link-type="doi" xlink:href="10.2196/50458" xlink:title="Published Article" xlink:type="simple">https://med.jmirx.org/2025/1/e50458</related-article><kwd-group><kwd>multistep fermentation</kwd><kwd>specific methane production</kwd><kwd>anaerobic digestion</kwd><kwd>kinetics study</kwd><kwd>biochar</kwd><kwd>first-order</kwd><kwd>modified Gompertz</kwd><kwd>mass balance</kwd><kwd>waste management</kwd><kwd>environment sustainability</kwd></kwd-group></article-meta></front><body><p><italic>This is a peer-review report for &#x201C;Converting Organic Municipal Solid Waste Into Volatile Fatty Acids and Biogas: Experimental Pilot and Batch Studies With Statistical Analysis&#x201D;</italic></p><sec id="s2"><title>Round 1 Review</title><p>The present manuscript [<xref ref-type="bibr" rid="ref1">1</xref>] deals with the study of the valorization of organic fractions of municipal solid waste through the production of volatile fatty acids and biogas. The article is interesting; in my opinion, it should be revised.</p><sec id="s1-1"><title>Comments</title><list list-type="order"><list-item><p>The presentation of the manuscript is very poor; the figures are not in the same format.</p></list-item><list-item><p>Some of the recent works should be discussed and cited in the Introduction section: [<xref ref-type="bibr" rid="ref2">2</xref>-<xref ref-type="bibr" rid="ref6">6</xref>].</p></list-item><list-item><p>The novelty of the work should be highlighted.</p></list-item><list-item><p>Full stops should be removed from all subheadings.</p></list-item><list-item><p>The Results and Discussion should be written in detail with proper subheadings.</p></list-item><list-item><p>There are some typo errors; they should be rectified.</p></list-item></list></sec></sec></body><back><fn-group><fn fn-type="conflict"><p>None declared.</p></fn></fn-group><ref-list><title>References</title><ref id="ref1"><label>1</label><nlm-citation citation-type="journal"><person-group person-group-type="author"><name name-style="western"><surname>Borhany</surname><given-names>H</given-names> </name></person-group><article-title>Converting organic municipal solid waste into volatile fatty acids and biogas: experimental pilot and batch studies with statistical analysis</article-title><source>JMIRx Med</source><year>2025</year><volume>6</volume><fpage>e50458</fpage><pub-id pub-id-type="doi">10.2196/50458</pub-id></nlm-citation></ref><ref id="ref2"><label>2</label><nlm-citation citation-type="journal"><person-group person-group-type="author"><name name-style="western"><surname>Jung</surname><given-names>S</given-names> </name><name name-style="western"><surname>Shetti</surname><given-names>NP</given-names> </name><name name-style="western"><surname>Reddy</surname><given-names>KR</given-names> </name><etal/></person-group><article-title>Synthesis of different biofuels from livestock waste materials and their potential as sustainable feedstocks &#x2013; 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