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Anaerobic microorganisms with the ability to biodegrade petroleum hydrocarbons are important in the treatment of contaminated matrices, both in situ in deep subsurfaces, or ex situ in bioreactors. In the latter, part of the energetic value of these compounds can be recovered in the form of biogas. Anaerobic degradation of petroleum hydrocarbons can be improved by various iron compounds, but different iron species exert distinct effects. For example, Fe(III) can be used as an electron acceptor in microbial hydrocarbon degradation, zero-valent iron can donate electrons for enhanced methanogenesis, and conductive iron oxides may facilitate electron transfers in methanogenic processes. Iron compounds can also act as hydrocarbon adsorbents, or be involved in secondary abiotic reactions, overall promoting hydrocarbon biodegradation. These multiple roles of iron are comprehensively reviewed in this paper and linked to key functional microorganisms involved in these processes, to the underlying mechanisms, and to the main influential factors. Recent research progress, future perspectives, and remaining challenges on the application of iron-assisted anaerobic hydrocarbon degradation are highlighted.<\/jats:p>","DOI":"10.3390\/microorganisms10112142","type":"journal-article","created":{"date-parts":[[2022,10,30]],"date-time":"2022-10-30T09:01:42Z","timestamp":1667120502000},"page":"2142","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Iron Compounds in Anaerobic Degradation of Petroleum Hydrocarbons: A Review"],"prefix":"10.3390","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4229-8947","authenticated-orcid":false,"given":"Ana R.","family":"Castro","sequence":"first","affiliation":[{"name":"CEB\u2014Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal"},{"name":"LABBELS\u2014Associate Laboratory, 4704-553 Braga\/Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7187-0538","authenticated-orcid":false,"given":"Gilberto","family":"Martins","sequence":"additional","affiliation":[{"name":"CEB\u2014Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal"},{"name":"LABBELS\u2014Associate Laboratory, 4704-553 Braga\/Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6037-4248","authenticated-orcid":false,"given":"Andreia F.","family":"Salvador","sequence":"additional","affiliation":[{"name":"CEB\u2014Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal"},{"name":"LABBELS\u2014Associate Laboratory, 4704-553 Braga\/Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7999-4620","authenticated-orcid":false,"given":"Ana J.","family":"Cavaleiro","sequence":"additional","affiliation":[{"name":"CEB\u2014Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal"},{"name":"LABBELS\u2014Associate Laboratory, 4704-553 Braga\/Guimar\u00e3es, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,10,29]]},"reference":[{"key":"ref_1","unstructured":"Jafarinejad, S. 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