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  • 1.
    Mohammadi, Ali
    et al.
    Univ New England, Sch Environm & Rural Sci, Armidale, NSW 2351, Australia..
    Cowie, Annette L.
    Univ New England, Sch Environm & Rural Sci, Armidale, NSW 2351, Australia.;Beef Ind Ctr, NSW Dept Primary Ind, Trevenna Rd, Armidale, NSW 2351, Australia..
    Cacho, Oscar
    Univ New England, UNE Business Sch, Armidale, NSW 2351, Australia..
    Kristiansen, Paul
    Univ New England, Sch Environm & Rural Sci, Armidale, NSW 2351, Australia..
    Mai, Thi Lan Anh
    hai Nguyen Univ Sci, Thai Nguyen, Vietnam.
    Joseph, Stephen
    Univ New England, Sch Environm & Rural Sci, Armidale, NSW 2351, Australia.;Univ Newcastle, Discipline Chem, Callaghan, NSW 2308, Australia.;Univ New South Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia..
    Biochar addition in rice farming systems: Economic and energy benefits2017Ingår i: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 140, s. 415-425Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study investigated economic returns and energy use of alternative rice production systems in North Vietnam with various residue management options. The traditional practice of open burning of rice residues (System A) was compared with the alternative of converting residues to biochar, which was returned to the paddy fields (System B). It was assumed that households used improved cook-stoves and drum ovens to produce biochar, and that the agronomic impacts of biochar compound with increasing biochar applications until reaching maximum benefit at 18 Mg ha(-1). This amount of biochar would take eight years to be produced in pyrolytic cook-stoves and drum ovens using the rice residues produced on site. The net present value (NPV) of producing rice in the two systems was calculated based on their expected streams of costs and benefits. Biochar addition enhanced the NPV of rice by 12% and reduced the non-renewable energy intensity by 27%, relative to System A, after eight years of application. The difference in NPV values between production systems significantly increased to 23% and 71% by crediting GHG emissions abatement in low and high carbon price scenarios, respectively. These findings demonstrate the potential economic benefits of converting rice residues to biochar for soil application. (C) 2017 Elsevier Ltd. All rights reserved.

  • 2.
    Mohammadi, Ali
    et al.
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper (from 2013).
    Sandberg, Maria
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper (from 2013).
    Govindarajan, Venkatesh
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper (from 2013).
    Eskandari, Samieh
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper (from 2013).
    Dalgaard, Tommy
    Aarhus University, Denmark.
    Joseph, Stephen
    University of New South Wales, Australia.
    Granström, Karin
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper (from 2013).
    Environmental performance of end-of-life handling alternatives for paper-and-pulp-mill sludge: Using digestate as a source of energy or for biochar production2019Ingår i: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 182, s. 594-605Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper evaluates the environmental impacts of different alternatives for handling of sludge from paper and pulp mills in Sweden, using Life Cycle Assessment (LCA). The common practice of incineration of biosludge with energy recovery followed by landfilling of ash (System A) was compared with the alternative of digesting sludge anaerobically to produce biogas using different digestate residue management options. The digestate produced from anaerobic digestion (AD) was assumed to be incinerated for heat energy recovery in System B or pyrolyzed for biochar production in System C to be mixed with forest soils. The impact categories considered in this work are climate change, non-renewable energy use, mineral extraction, aquatic ecotoxicity, carcinogens and non-carcinogens. The LCA results demonstrate that the two proposed systems significantly reduce the environmental impacts of biosludge management relative to incineration. An 85% reduction in the aquatic ecotoxicity impact is achieved in System C, due to the reduced mobility of heavy metals in biochar relative to ash. System C, on the whole, outperformed the other two, leading the authors to the recommendation that the use of pulp and paper mill biosludge in biogas-biochar production systems is preferable to merely recovering energy from it.

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