Enhancement of methane production from the anaerobic digestion of chemical pulp and paper mill effluents

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Rodriguez-Chiang, Lourdes
dc.date.accessioned 2018-12-05T10:03:43Z
dc.date.available 2018-12-05T10:03:43Z
dc.date.issued 2018
dc.identifier.isbn 978-952-60-7895-3 (printed)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/34869
dc.description This doctoral dissertation was completed under the Erasmus Mundus Joint Doctorate program Environomical Pathways for Sustainable Energy Services (SELECT+) for the degree of Doctor of Science (Technology) from Aalto University and the degree of Doctor from the Universitat Politècnica de Catalunya. en
dc.description.abstract Sustainability of resources such as energy, water and waste have become important drivers in our current economy. For large industries that are water and energy intensive like pulp and paper (P&P) mills, this is a specifically relevant issue. The large and heterogenous volumes of effluents in P&P mills make it a difficult task to properly treat before discharge. Anaerobic digestion is an efficient wastewater technology that cleans the effluent, reduces wasted sludge and simultaneously produces methane that can be further used as energy. The research work described in this thesis aims to enhance the methane production from the anaerobic digestion of different chemical P&P mill effluents. Through effluent characterization, variability of process parameters, promoting agents and the assessment of biochemical methane potential (BMP) tests, the benefits of three potential methods to enhance methane yields of wastewaters were evaluated. In addition, the conversion of chemical pulp fibers directly to methane was explored. The attained results described the different improvements that can be made to enhance methane production. Easily degradable effluents such as hydrolyzed filtrates and evaporator condensates contain high concentrations of sugars and acetic acid respectively, which could encourage an oversaturation of acids during acidogenesis. An inoculum to substrate ratio (ISR) of 2 proved to be the optimal in order to add the required buffering capacity to neutralize the pH and produce significantly high methane yields of up to 333 mLCH4/gVS. The high productivity of these effluents can be then considered for co-digestion with harder to treat effluents such as lignin-rich streams. Lignin clearly hinders methane production indicated by the negative linear correlation found between lignin content and methane yield. The co-digestion of lignin-rich effluent with evaporator condensates from neutral sulfite semi-chemical (NSSC) pulping proved to enhance the overall methane productivity of the mill´s wastewater treatment. Furthermore, the assessment of hydrotalcites (HT) addition indicated a contribution towards an increase in methane yield, faster production rates and a greater lignin removal. The poor performance of calcined HT suggests that the advantages of HT addition came from the layered sheet structure. Finally, besides establishing the methane potential in various P&P effluents, the examination of methane productivity of different pulp fibers and its products proved to be a promising new energy alternative to explore. Brown, oxygen delignified and bleached pulp gathered biodegradabilities of up to 90% and methane yields as high as 380 mLCH4/gVS. With the current changing bio-economy this last approach paves the way in exploring alternative and novel uses for chemical pulp mill products. en
dc.format.extent 58 + app. 47
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 48/2018
dc.relation.haspart [Publication 1]: Rodriguez-Chiang, L.M., & Dahl, O. (2015) Effect of Inoculum to Substrate Ratio on the Methane Potential of Microcrystalline Cellulose Production Wastewater. BioResources 10(1), 898-911. DOI: 10.15376/biores.10.1.898-911
dc.relation.haspart [Publication 2]: Rodriguez-Chiang, L.M., Llorca, J., & Dahl, O. (2016) Effect of Fe–Zn–Mg–Al hydrotalcites on the methane potential of synthetic sulfate-containing wastewater. J Water Process Eng 10, 120–127. DOI: 10.1016/j.jwpe.2016.03.001
dc.relation.haspart [Publication 3]: Rodriguez-Chiang, L., Llorca, J., & Dahl, O. (2016) Anaerobic co-digestion of acetate-rich with lignin-rich wastewater and the effect of hydrotalcite addition. Bioresour Technol 218, 84-91. DOI: 10.1016/j.biortech.2016.06.074
dc.relation.haspart [Publication 4]: Rodriguez-Chiang, L., Vanhatalo, K., Llorca, J., & Dahl, O. (2017) New alternative energy pathway for chemical pulp mills: from traditional fibers to methane production. Bioresour Technol 235, 265-273. DOI: 10.1016/j.biortech.2017.03.140
dc.subject.other Paper technology en
dc.title Enhancement of methane production from the anaerobic digestion of chemical pulp and paper mill effluents en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.contributor.school School of Chemical Technology en
dc.contributor.department Biotuotteiden ja biotekniikan laitos fi
dc.contributor.department Department of Bioproducts and Biosystems en
dc.subject.keyword pulp and paper en
dc.subject.keyword methane en
dc.subject.keyword anaerobic digestion en
dc.subject.keyword wastewater treatment en
dc.subject.keyword industrial effluents en
dc.identifier.urn URN:NBN:fi:aalto-201812045884
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Dahl, Olli, Prof., Aalto University, Department of Bioproducts and Biosystems, Finland; Llorca, Jordi, Prof., Universitat Politècnica de Catalunya, Spain
dc.opn Borrion, Aiduan, Assistant Prof., Dr., University College London, UK
dc.opn Soler Turu, Lluis, Assistant Prof., Dr., Universitat Politècnica de Catalunya, Spain
dc.opn Melin, Johan Kristian, Dr., VTT Technical Research Center of Finland, Finland
dc.contributor.lab Clean Technologies en
dc.rev Puhakka, Jaakko, Prof., Tampere University of Technology, Finland
dc.rev Murphy, Jerry D., Prof., University College Cork, Ireland
dc.date.defence 2018-05-04


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