{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,16]],"date-time":"2026-03-16T18:26:47Z","timestamp":1773685607591,"version":"3.50.1"},"reference-count":50,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2020,11,19]],"date-time":"2020-11-19T00:00:00Z","timestamp":1605744000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["POCI-01-0145-FEDER-016575"],"award-info":[{"award-number":["POCI-01-0145-FEDER-016575"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["UIDB\/04469\/2020"],"award-info":[{"award-number":["UIDB\/04469\/2020"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["UIDB\/50020\/20"],"award-info":[{"award-number":["UIDB\/50020\/20"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["EECINST\/00049\/2018"],"award-info":[{"award-number":["EECINST\/00049\/2018"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100008530","name":"European Regional Development Fund","doi-asserted-by":"publisher","award":["NORTE-01-0145-FEDER-000004"],"award-info":[{"award-number":["NORTE-01-0145-FEDER-000004"]}],"id":[{"id":"10.13039\/501100008530","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Applied Sciences"],"abstract":"<jats:p>Conductive nanomaterials affect anaerobic digestion (AD) processes usually by improving methane production. Nevertheless, their effect on anaerobic communities, and particularly on specific trophic groups such as syntrophic bacteria or methanogens, is not extensively reported. In this work, we evaluate the effect of multi-walled carbon nanotubes (MWCNT) on the activity of two different anaerobic microbial communities: an anaerobic sludge and a river sediment. Methane production by anaerobic sludge was assessed in the presence of different MWCNT concentrations, with direct methanogenic substrates (acetate, hydrogen) and with typical syntrophic substrates (ethanol, butyrate). MWCNT accelerated the initial specific methane production rate (SMPR) from all compounds, with a more pronounced effect on the assays with acetate and butyrate, i.e., 2.1 and 2.6 times, respectively. In the incubations with hydrogen and ethanol, SMPR increased 1.1 and 1.2 times. Experiments with the river sediment were performed in the presence of MWCNT and MWCNT impregnated with 2% iron (MWCNT-Fe). Cumulative methane production was 10.2 and 4.5 times higher in the assays with MWCNT-Fe and MWCNT, respectively, than in the assays without MWCNT. This shows the high potential of MWCNT toward bioenergy production, in waste\/wastewater treatment or ex situ bioremediation in anaerobic digesters.<\/jats:p>","DOI":"10.3390\/app10228184","type":"journal-article","created":{"date-parts":[[2020,11,19]],"date-time":"2020-11-19T06:23:52Z","timestamp":1605767032000},"page":"8184","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Multi-Walled Carbon Nanotubes Enhance Methanogenesis from Diverse Organic Compounds in Anaerobic Sludge and River Sediments"],"prefix":"10.3390","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7999-4620","authenticated-orcid":false,"given":"Ana","family":"Cavaleiro","sequence":"first","affiliation":[{"name":"CEB - Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6037-4248","authenticated-orcid":false,"given":"Andreia","family":"Salvador","sequence":"additional","affiliation":[{"name":"CEB - Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7187-0538","authenticated-orcid":false,"given":"Gilberto","family":"Martins","sequence":"additional","affiliation":[{"name":"CEB - Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1396-0521","authenticated-orcid":false,"given":"Cl\u00e1udia","family":"Oliveira","sequence":"additional","affiliation":[{"name":"CEB - Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal"}]},{"given":"Yuchen","family":"Liu","sequence":"additional","affiliation":[{"name":"Sub-Department of Environmental Technology, Wageningen University &amp; Research, 6708 WG Wageningen, The Netherlands"}]},{"given":"Valdo","family":"Martins","sequence":"additional","affiliation":[{"name":"CEB - Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4229-8947","authenticated-orcid":false,"given":"Ana","family":"Castro","sequence":"additional","affiliation":[{"name":"CEB - Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9015-1237","authenticated-orcid":false,"given":"Ol\u00edvia","family":"Soares","sequence":"additional","affiliation":[{"name":"Laboratory of Separation and Reaction Engineering\u2212Laboratory of Catalysis and Materials (LSRE-LCM), Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5447-2471","authenticated-orcid":false,"given":"Manuel","family":"Pereira","sequence":"additional","affiliation":[{"name":"Laboratory of Separation and Reaction Engineering\u2212Laboratory of Catalysis and Materials (LSRE-LCM), Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1396-9078","authenticated-orcid":false,"given":"Luciana","family":"Pereira","sequence":"additional","affiliation":[{"name":"CEB - Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9622-007X","authenticated-orcid":false,"given":"Alette","family":"Langenhoff","sequence":"additional","affiliation":[{"name":"Sub-Department of Environmental Technology, Wageningen University &amp; Research, 6708 WG Wageningen, The Netherlands"}]},{"given":"Maria","family":"Pereira","sequence":"additional","affiliation":[{"name":"CEB - Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal"}]},{"given":"M. Madalena","family":"Alves","sequence":"additional","affiliation":[{"name":"CEB - Centre of Biological Engineering, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2020,11,19]]},"reference":[{"key":"ref_1","unstructured":"Murphy, J.D. (2018). The Role of Anaerobic Digestion and Biogas in the Circular Economy, IEA Bioenergy. IEA Bioenergy Task 37."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"321","DOI":"10.1007\/s00253-012-4152-7","article-title":"Production of biogas from solid organic wastes through anaerobic digestion: A review","volume":"95","author":"Omar","year":"2012","journal-title":"Appl. Microbiol. Biotechnol."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"5065","DOI":"10.1007\/s00253-018-9039-9","article-title":"New concepts in anaerobic digestion processes: Recent advances and biological aspects","volume":"102","author":"Armato","year":"2018","journal-title":"Appl. Microbiol. 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