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  • 1.
    Naqvi, Muhammad
    et al.
    Mälardalen University, School of Business, Society and Engineering, Future Energy Center. Department of Chemical Engineering and Technology, KTH.
    Yan, Jinyue
    Mälardalen University, School of Sustainable Development of Society and Technology. Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Dahlquist, Erik
    Mälardalen University, School of Sustainable Development of Society and Technology. Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
    Bio-refinery system in a pulp mill for methanol production with comparison of pressurized black liquor gasification and dry gasification using direct causticization2012In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 90, no 1, p. 24-31Article in journal (Other academic)
    Abstract [en]

    Black liquor gasification (BLG) for bio-fuel or electricity production at the modern pulp mills is a field incontinuous evolution and the efforts are considerably driven by the climate change, fuel security, andrenewable energy. This paper evaluates and compares two BLG systems for methanol production: (i) oxygenblown pressurized thermal BLG; and (ii) dry BLG with direct causticization, which have beenregarded as the most potential technology candidates for the future deployment. A key objective is toassess integration possibilities of BLG technologies with the reference Kraft pulp mill producing1000 air dried tonnes (ADt) pulp/day replacing conventional recovery cycle. The study was performedto compare the systems’ performance in terms of potential methanol production, energy efficiency,and potential CO2 reductions. The results indicate larger potential of black liquor conversion to methanolfrom the pressurized BLG system (about 77 million tonnes/year of methanol) than the dry BLG system(about 30 million tonnes/year of methanol) utilizing identical amount of black liquor available worldwide(220 million tDS/year). The potential CO2 emissions reduction from the transport sector is substantiallyhigher in pressurized BLG system (117 million tonnes/year CO2 reductions) as compared to dry BLGsystem (45 million tonnes/year CO2 reductions). However, the dry BLG system with direct causticizationshows better results when considering consequences of additional biomass import. In addition,comparison of methanol production via BLG with other bio-refinery products, e.g. hydrogen, dimethylether (DME) and bio-methane, has also been discussed.

  • 2.
    Waara, Sylvia
    et al.
    Mälardalen University, Department of Public Technology. Mälardalen University, School of Sustainable Development of Society and Technology.
    Waara, Karl-Otto
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Forsberg, Åke
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Fridolfsson, Magnus
    Performance of a constructed wetland system for treatment of landfill leachate.2008In: Waste 2008. Waste and Resource management-A shared responsibility, 2008, p. 655-667Conference paper (Refereed)
    Abstract [en]

    The performance of a constructed wetland for treatment of landfill leachate has been evaluated based upon data obtained during 4 years (2003-2006). It consists of a series of 10 ponds with a total capacity of 52.000 m3 covering 8 ha. Using univariate and multivariate statistics (PCA) the reduction pattern of a large number of chemical parameters including heavy metals has been investigated in 3 parts of the wetland with equal volume. Analyses show that many parameters are removed to the greatest extent in the first part of the system (e.g. many heavy metals, total suspended solids) or the second part of the system (N-NH4) while other parameters such as total nitrogen are more gradually reduced (10 ton/year removed).  Toxicity testing with 5 bioassays showed that toxicity was sometimes observed at the inlet but no toxicity was observed at the outlet for 4 of the test species. The data presented will be used for optimizing the treatment process as well as to improve the monitoring program.

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