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The introduction of DOP into WWTP anaerobic digester facilities could significantly increase biomethane production and enhance the sustainability of both activities. An improvement in the system\u2019s performance was supported by stability parameters: total alkalinity increased and stabilised with the addition of 5% v\/v DOP, and the specific energy loading rate was maintained at 0.177\u2009\u00b1\u20090.03\u2009d<jats:sup>\u22121<\/jats:sup>, which indicated better buffer capacity and stability in the bioreactor, and the possibility of enhancing the organic loading rate. In terms of average daily biogas production rate, an increase of 39% was achieved, up to 0.39\u2009\u00b1\u20090.11\u2009L L<jats:sup>\u22121<\/jats:sup>d<jats:sup>\u22121<\/jats:sup>. Moreover, there was a 40% and 37% improvement in specific methane production and methane production rate, respectively, up to 0.28\u2009\u00b1\u20090.02\u2009L CH<jats:sub>4<\/jats:sub> g <jats:sub>TVS<\/jats:sub><jats:sup>\u22121<\/jats:sup> and 0.26\u2009\u00b1\u20090.08\u2009L L<jats:sup>\u22121<\/jats:sup>d<jats:sup>\u22121<\/jats:sup>. In addition, the proposed strategy leads to an energy saving of 20,328.6\u2009kWh year<jats:sup>\u22121<\/jats:sup> at the WWTP as a result of the electric energy production surplus, corresponding to an annual saving of \u20ac3293.23. <\/jats:p>","DOI":"10.1177\/0734242x211003979","type":"journal-article","created":{"date-parts":[[2021,4,28]],"date-time":"2021-04-28T16:28:37Z","timestamp":1619627317000},"page":"565-574","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":10,"title":["Enhanced biomethane production by co-digestion of mixed sewage sludge and dephenolised two-phase olive pomace"],"prefix":"10.1177","volume":"40","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2957-7340","authenticated-orcid":false,"given":"Rita","family":"Fragoso","sequence":"first","affiliation":[{"name":"LEAF\u2013Linking Landscape, Environment, Agriculture and Food\u2013Research Center, Instituto Superior de Agronomia, Universidade de Lisboa, Portugal"}]},{"given":"Ana Catarina","family":"Henriques","sequence":"additional","affiliation":[{"name":"Instituto Superior de Agronomia, University of Lisbon, Portugal"}]},{"given":"Javier","family":"Ochando-Pulido","sequence":"additional","affiliation":[{"name":"Department of Chemical Engineering, University of Granada, Spain"}]},{"given":"Nicole","family":"Smozinski","sequence":"additional","affiliation":[{"name":"Instituto Superior de Agronomia, University of Lisbon, Portugal"}]},{"given":"Elizabeth","family":"Duarte","sequence":"additional","affiliation":[{"name":"LEAF\u2013Linking Landscape, Environment, Agriculture and Food\u2013Research Center, Instituto Superior de Agronomia, Universidade de Lisboa, Portugal"}]}],"member":"179","published-online":{"date-parts":[[2021,4,28]]},"reference":[{"key":"bibr1-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/j.jhazmat.2008.12.029"},{"key":"bibr2-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/j.wasman.2015.08.020"},{"key":"bibr3-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/j.renene.2012.04.038"},{"key":"bibr4-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/j.jhazmat.2008.06.041"},{"key":"bibr5-0734242X211003979","volume-title":"Standard methods for the examination of water and wastewater","author":"Baird R","year":"2017","edition":"23"},{"key":"bibr6-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/j.renene.2015.03.007"},{"key":"bibr7-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/j.jece.2013.09.008"},{"key":"bibr8-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/j.jhazmat.2007.07.092"},{"key":"bibr9-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/j.cej.2012.04.022"},{"key":"bibr10-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/S1359-4311(02)00173-4"},{"key":"bibr11-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1007\/s12257-011-0117-4"},{"key":"bibr12-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/j.procbio.2013.07.010"},{"key":"bibr13-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/j.spc.2019.04.003"},{"key":"bibr14-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.17265\/2159-5313\/2016.09.003"},{"key":"bibr15-0734242X211003979","unstructured":"FAO (2019) FAOSTAT data. http:\/\/www.fao.org\/faostat\/en\/#data\/QD (accessed 20 December 2019)."},{"key":"bibr16-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/j.biortech.2009.09.067"},{"key":"bibr17-0734242X211003979","volume-title":"Standard Methods for the Examination of Water and Wastewater","author":"Greenberg AE","year":"2005","edition":"22"},{"key":"bibr18-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/j.procbio.2015.07.008"},{"key":"bibr19-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/j.biortech.2009.04.047"},{"key":"bibr20-0734242X211003979","doi-asserted-by":"publisher","DOI":"10.1016\/j.rser.2016.11.184"},{"key":"bibr21-0734242X211003979","unstructured":"IOC (2018) World olive oil figures\/EU olive oil figure. 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