Biorefining in the prevailing energy and materials crisis: a review of sustainable pathways for biorefinery value chains and sustainability assessment methodologies.

The aim of the current paper is to discuss the sustainability aspect of biorefinery systems with focus on biomass supply chains, processing of biomass feedstocks in biorefinery platforms and sustainability assessment methodologies. From the stand point of sustainability, it is important to optimize the agricultural production system and minimize the related environmental impacts at the farming system level. These impacts are primarily related to agri-chemical inputs and the related undesired environmental emissions and to the repercussions from biomass production. At the same time, the biorefineries need a year-round supply of biomass and about 40–60% of the total operating cost of a typical biorefinery is related to the feedstocks chosen, and thus highlights on the careful prioritization of feedstocks mainly based on their economic and environmental loadings. Regarding the processing in biorefinery platforms, chemical composition of biomasses is important. Biomasses with higher concentrations of cellulose and hemicelluloses compared to lignin are preferred for bioethanol production in the lignocellulosic biorefinery, since the biodegradability of cellulose is higher than lignin. A green biorefinery platform enables the extraction of protein from grasses, producing an important alternative to importing protein sources for food products and animal feed, while also allowing processing of residues to deliver bioethanol. Currently, there are several approaches to integrate biorefinery platforms, which are aimed to enhance their economic and environmental sustainability. Regarding sustainability assessment, the complexities related to the material flows in a biorefinery and the delivery of alternative biobased products means dealing with multiple indicators in the decision-making process to enable comparisons of alternatives. Life Cycle Assessment is regarded as one of the most relevant tools to assess the environmental hotspots in the biomass supply chains, at processing stages and also to support in the prioritization of any specific biobased products and the alternatives delivered from biorefineries.

[1]  M. Olalla‐Tárraga,et al.  A conceptual framework to assess sustainability in urban ecological systems , 2006 .

[2]  David J. Weiss,et al.  How to Use Multiattribute Utility Measurement for Social Decisionmaking , 2008 .

[3]  J. Schröder,et al.  Intercropping reduces nitrate leaching from under field crops without loss of yield: A modelling study , 2007 .

[4]  Klaus Rennings,et al.  Sustainability indicators: geology meets economy , 1997 .

[5]  Michael Wang,et al.  Effects of Fuel Ethanol Use on Fuel-Cycle Energy and Greenhouse Gas Emissions , 1999 .

[6]  G. Bohlmann.  Process economic considerations for production of ethanol from biomass feedstocks , 2006 .

[7]  P. Gallezot,et al.  Conversion of biomass to selected chemical products. , 2012, Chemical Society reviews.

[8]  David Pimentel,et al.  Ethanol fuels: Energy security, economics, and the environment , 1991 .

[9]  J. Gressel.  Transgenics are imperative for biofuel crops , 2008 .

[10]  J. Porter,et al.  A model for fossil energy use in Danish agriculture used to compare organic and conventional farming , 2001 .

[11]  R. H. Dowdy,et al.  Soil organic carbon and 13C abundance as related to tillage, crop residue, and nitrogen fertilization under continuous corn management in Minnesota. , 2000 .

[12]  J. Olesen,et al.  Carbon footprints of crops from organic and conventional arable crop rotations – using a life cycle assessment approach , 2014 .

[13]  M. Lundin,et al.  A life cycle assessment based procedure for development of environmental sustainability indicators for urban water systems , 2002 .

[14]  Y Y Lee,et al.  Pretreatment of corn stover by aqueous ammonia. , 2003, Bioresource technology.

[15]  Tommy Dalgaard,et al.  Life Cycle Assessment of Miscanthus as a Fuel Alternative in District Heat Production , 2013 .

[16]  R. Perlack,et al.  Interactions among bioenergy feedstock choices, landscape dynamics, and land use. , 2011, Ecological applications : a publication of the Ecological Society of America.

[17]  Ranjan Parajuli,et al.  Beyond oil and gas: possible future scenarios for the electricity sector in Saudi Arabia , 2015 .

[18]  F. V. Stappen,et al.  Direct and indirect land use changes issues in European sustainability initiatives: State-of-the-art, open issues and future developments , 2011 .

[19]  Adrian Leip,et al.  Nitrogen and biofuels; an overview of the current state of knowledge , 2010, Nutrient Cycling in Agroecosystems.

[20]  John Dixon,et al.  Development perspectives of the biobased economy: a review. , 2010 .

[21]  S. Bidoki,et al.  Environmental and economical acceptance of polyvinyl chloride (PVC) coating agents , 2010 .

[22]  Francesco Cherubini,et al.  Crop residues as raw materials for biorefinery systems - A LCA case study , 2010 .

[23]  Matthias Ehrgott,et al.  Multiple criteria decision analysis: state of the art surveys , 2005 .

[24]  Tomas Ekvall,et al.  System boundaries and input data in consequential life cycle inventory analysis , 2004 .

[25]  Reza Baradaran Kazemzadeh,et al.  PROMETHEE: A comprehensive literature review on methodologies and applications , 2010, Eur. J. Oper. Res..

[26]  J. Schmidt.  Development of LCIA characterisation factors for land use impacts on biodiversity , 2008 .

[27]  M. Galbe,et al.  Process engineering economics of bioethanol production. , 2007, Advances in biochemical engineering/biotechnology.

[28]  Dehua Liu,et al.  Organosolv pretreatment of lignocellulosic biomass for enzymatic hydrolysis , 2009, Applied Microbiology and Biotechnology.

[29]  Robert C. Brown,et al.  Comparative economics of biorefineries based on the biochemical and thermochemical platforms , 2007 .

[30]  Lisbeth Mogensen,et al.  Environmental performance of crop residues as an energy source for electricity production: The case of wheat straw in Denmark , 2013 .

[31]  Johan P.M. Sanders,et al.  Bulk chemicals from biomass , 2008 .

[32]  Fredrik von Malmborg,et al.  What can we learn from local substance flow analyses? The review of cadmium flows in Swedish municipalities , 2004 .

[33]  Blake A. Simmons,et al.  Techno‐economic analysis of a lignocellulosic ethanol biorefinery with ionic liquid pre‐treatment , 2011 .

[34]  R. Clift,et al.  Developing a sustainability framework for the assessment of bioenergy systems , 2007 .

[35]  Cosme de Arana,et al.  21st European Biomass Conference and Exhibition , 2012 .

[36]  Charlotte K. Williams,et al.  The Path Forward for Biofuels and Biomaterials , 2006, Science.

[37]  J. R. Hess,et al.  Cellulosic biomass feedstocks and logistics for ethanol production , 2007 .

[38]  Michael Taylor,et al.  An overview of second generation biofuel technologies. , 2010, Bioresource technology.

[39]  Kwazulu-Natal. Colonial Office.  Statistical year book , 2012 .

[40]  J. Pellegrino,et al.  Opportunities in the industrial biobased products industry , 2004, Applied biochemistry and biotechnology.

[41]  David J. Weiss,et al.  SMARTS and SMARTER: Improved Simple Methods for Multiattribute Utility Measurement , 2008 .

[42]  B. Ahring,et al.  Coproduction of bioethanol with other biofuels. , 2007, Advances in biochemical engineering/biotechnology.

[43]  Luís C. Duarte,et al.  Hemicellulose biorefineries: a review on biomass pretreatments , 2008 .

[44]  B. Dale,et al.  Cumulative Energy and Global Warming Impact from the Production of Biomass for Biobased Products , 2003 .

[45]  Thomas Hirth,et al.  Lignocellulose‐based Chemical Products and Product Family Trees , 2008 .

[46]  Miguel Brandão,et al.  LCA screening of biofuels: iLUC, biomass manipulation and soil carbon , 2013 .

[47]  Michael Q. Wang,et al.  Life-cycle energy and greenhouse gas emission impacts of different corn ethanol plant types , 2007 .

[48]  Pascale Champagne,et al.  A biorefinery processing perspective: treatment of lignocellulosic materials for the production of value-added products. , 2010, Bioresource technology.

[49]  B. A. Conway,et al.  The effects of laforin, malin, Stbd1, and Ptg deficiencies on heart glycogen levels in Pompe disease mouse models , 2015 .

[50]  Irini Angelidaki,et al.  Production of bioethanol from wheat straw: An overview on pretreatment, hydrolysis and fermentation. , 2010, Bioresource technology.

[51]  Haris Ch. Doukas,et al.  Multi-criteria decision aid for the formulation of sustainable technological energy priorities using linguistic variables , 2007, Eur. J. Oper. Res..

[52]  Heinz A. Preisig,et al.  Indicators for the sustainability assessment of wastewater treatment systems , 2002 .

[53]  P. M. Pelagagge,et al.  Economics of biomass energy utilization in combustion and gasification plants: effects of logistic variables , 2005 .

[54]  C. Kroeze.  N2O from animal waste. Methodology according to IPCC Guidelines for National Greenhouse Gas Inventories. , 1997 .

[55]  Ranjan Parajuli.  Looking into the Danish energy system: Lesson to be learned by other communities , 2012 .

[56]  Jiangjiang Wang,et al.  A fuzzy multi-criteria decision-making model for trigeneration system , 2008 .

[57]  F. M. Andersen,et al.  Coherent Energy and Environmental System Analysis , 2011 .

[58]  Alessio Boldrin,et al.  Energy and environmental analysis of a rapeseed biorefinery conversion process , 2013 .

[59]  Colin Webb,et al.  Production of Chemicals from Biomass , 2008 .

[60]  P. Flynn,et al.  Development of a multicriteria assessment model for ranking biomass feedstock collection and transportation systems. , 2006, Applied biochemistry and biotechnology.

[61]  C. Wyman,et al.  Features of promising technologies for pretreatment of lignocellulosic biomass. , 2005, Bioresource technology.

[62]  Jean-Paul Lange,et al.  Fuels and Chemicals Manufacturing; Guidelines for Understanding and Minimizing the Production Costs , 2001 .

[63]  Warren Mabee,et al.  Biorefining of softwoods using ethanol organosolv pulping: preliminary evaluation of process streams for manufacture of fuel-grade ethanol and co-products. , 2005, Biotechnology and bioengineering.

[64]  M. Galbe,et al.  Pretreatment of lignocellulosic materials for efficient bioethanol production. , 2007, Advances in biochemical engineering/biotechnology.

[65]  الشارقة، دائرة الإحصاء و التنمية المجتمعية.  Statistical Year Book , 2012 .

[66]  Brian Vad Mathiesen,et al.  Energy system analysis of 100% renewable energy systems-The case of Denmark in years 2030 and 2050 , 2009 .

[67]  P. Kaparaju,et al.  Bioethanol, biohydrogen and biogas production from wheat straw in a biorefinery concept. , 2009, Bioresource technology.

[68]  Amit Kumar,et al.  A conceptual framework for siting biorefineries in the Canadian Prairies , 2010 .

[69]  B. Wachter,et al.  The Green Biorefinery Austria: Development of an integrated system for green biomass utilization , 2004 .

[70]  A. Dalai,et al.  Pathways of lignocellulosic biomass conversion to renewable fuels , 2014 .

[71]  D. Powlson,et al.  Soil carbon sequestration to mitigate climate change: a critical re‐examination to identify the true and the false , 2011 .

[72]  Julio C. Sacramento-Rivero.  A methodology for evaluating the sustainability of biorefineries: framework and indicators , 2012 .

[73]  Laurent Botti,et al.  Multi-criteria ELECTRE method and destination competitiveness , 2013 .

[74]  Martin Lersch,et al.  History and future of world's most advanced biorefinery in operation , 2012 .

[75]  Jiangjiang Wang,et al.  Review on multi-criteria decision analysis aid in sustainable energy decision-making , 2009 .

[76]  Himadri Roy Ghatak,et al.  Biorefineries from the perspective of sustainability: Feedstocks, products, and processes , 2011 .

[77]  R. Heijungs,et al.  Guidelines for application of deepened and broadened LCA , 2009 .

[78]  Manfred Lenzen,et al.  A research agenda for improving national Ecological Footprint accounts , 2009 .

[79]  P. Börjesson.  Energy Analysis of Biomass Production and Transportation , 1996 .

[80]  Wei Yuan,et al.  Optimal biorefinery product allocation by combining process and economic modeling , 2008 .

[81]  K. Paustian,et al.  Energy and Environmental Aspects of Using Corn Stover for Fuel Ethanol , 2003 .

[82]  Reinout Heijungs,et al.  Attributional and consequential LCA of milk production , 2008 .

[83]  Arif Hepbasli,et al.  A key review on exergetic analysis and assessment of renewable energy resources for a sustainable future , 2008 .

[84]  Theocharis Tsoutsos,et al.  Life Cycle Assessment for biodiesel production under Greek climate conditions , 2010 .

[85]  S. Kent Hoekman,et al.  Biofuels in the U.S. – Challenges and Opportunities , 2009 .

[86]  Pauli Kiel,et al.  Integrated utilisation of green biomass in the green biorefinery , 2000 .

[87]  Dharik S. Mallapragada,et al.  Economic analysis of novel synergistic biofuel (H2Bioil) processes , 2012 .

[88]  S. E. Simmelsgaard.  The effect of crop, N‐level, soil type and drainage on nitrate leaching from Danish soil , 1998 .

[89]  M. Himmel,et al.  Outlook for cellulase improvement: screening and selection strategies. , 2006, Biotechnology advances.

[90]  Gregory A. Norris,et al.  Integrating life cycle cost analysis and LCA , 2001 .

[91]  A. Faaij,et al.  Exploration of the possibilities for production of Fischer Tropsch liquids and power via biomass gasification , 2002 .

[92]  Adrian Bejan,et al.  Distribution of size in steam turbine power plants , 2009 .

[93]  Michael Q. Wang,et al.  The Energy Balance of Corn Ethanol: An Update , 2002 .

[94]  Mehrdad Tamiz,et al.  A method for solving fuzzy goal programming problems based on MINMAX approach , 2007, Eur. J. Oper. Res..

[95]  Peter Söderbaum,et al.  Ecological economics and organic farming , 2006 .

[96]  Francesco Cherubini,et al.  Energy- and greenhouse gas-based LCA of biofuel and bioenergy systems: Key issues, ranges and recommendations , 2009 .

[97]  Bruce E. Dale,et al.  'Greening' the chemical industry: Research and development priorities for biobased industrial products , 2003 .

[98]  H. Jørgensen.  Advanced biofuels in a biorefinery approach, February 28 - March 1, 2012, Copenhagen, Denmark. , 2012 .

[99]  Steven A. Melnyk,et al.  Applying environmental criteria to supplier assessment: A study in the application of the Analytical Hierarchy Process , 2002, Eur. J. Oper. Res..

[100]  A. Fernando,et al.  Environmental impact assessment of energy crops cultivation in Europe , 2010 .

[101]  Diana Gallego Carrera,et al.  Sustainability assessment of energy technologies via social indicators: Results of a survey among European energy experts , 2010 .

[102]  Paul Stuart,et al.  Integrating product portfolio design and supply chain design for the forest biorefinery , 2010, Comput. Chem. Eng..

[103]  H. Uellendahl,et al.  Energy balance and cost-benefit analysis of biogas production from perennial energy crops pretreated by wet oxidation. , 2008, Water science and technology : a journal of the International Association on Water Pollution Research.

[104]  Helmut Haberl,et al.  Progress towards sustainability? What the conceptual framework of material and energy flow accounting (MEFA) can offer , 2004 .

[105]  Eric D. Larson,et al.  A review of life-cycle analysis studies on liquid biofuel systems for the transport sector , 2006 .

[106]  Petros A. Pilavachi,et al.  Technological, economic and sustainability evaluation of power plants using the Analytic Hierarchy Process , 2009 .

[107]  Ortwin Renn.  Social assessment of waste energy utilization scenarios , 2003 .

[108]  M. Galbe,et al.  The influence of SO2 and H2SO4 impregnation of willow prior to steam pretreatment , 1995 .

[109]  Jamie Stephen,et al.  The impact of agricultural residue yield range on the delivered cost to a biorefinery in the Peace River region of Alberta, Canada , 2010 .

[110]  Ward Edwards,et al.  How to Use Multiattribute Utility Measurement for Social Decisionmaking , 1977, IEEE Transactions on Systems, Man, and Cybernetics.

[111]  Lennart Olsson,et al.  Categorising tools for sustainability assessment , 2007 .

[112]  G. Zacchi,et al.  Effect of hemicellulose and lignin removal on enzymatic hydrolysis of steam pretreated corn stover. , 2007, Bioresource technology.

[113]  Poul Alberg Østergaard,et al.  A comparison of diesel, biodiesel and solar PV-based water pumping systems in the context of rural Nepal , 2014 .

[114]  V. Stevanovic,et al.  Sustainable development of the Belgrade energy system , 2009 .

[115]  Jan Larsen,et al.  Inbicon makes lignocellulosic ethanol a commercial reality , 2012 .

[116]  William W. Braham,et al.  SUSTAINABILITY ASSESSMENT FRAMEWORKS , EVALUATION TOOLS AND 1 METRICS FOR BUILDINGS AND ITS ENVIRONMENT – A REVIEW 2 3 , 2011 .

[117]  Jan Larsen,et al.  The IBUS Process – Lignocellulosic Bioethanol Close to a Commercial Reality , 2008 .

[118]  Bilal Akash,et al.  Multi-criteria selection of electric power plants using analytical hierarchy process , 1999 .

[119]  M. Holtzapple,et al.  Fundamental factors affecting biomass enzymatic reactivity , 2000, Applied biochemistry and biotechnology.

[120]  E. Annevelink,et al.  Status report biorefinery 2007 , 2007 .

[121]  C. Somerville,et al.  Plants as factories for technical materials. , 2001, Plant physiology.

[122]  E. D. Gregorio,et al.  The path forward. , 2015 .

[123]  Henrik Wenzel,et al.  Modelling the carbon and nitrogen balances of direct land use changes from energy crops in Denmark: a consequential life cycle inventory , 2012 .

[124]  Anders Hammer Strømman,et al.  Influence of allocation methods on the environmental performance of biorefinery products—A case study , 2011 .

[125]  P. Poulton,et al.  Soil organic matter: its importance in sustainable agriculture and carbon dioxide fluxes. , 2009 .

[126]  Chun-Hsiung Hung,et al.  Temperature effects on fermentative hydrogen production from xylose using mixed anaerobic cultures , 2008 .

[127]  Gu Lb,et al.  Soil carbon stocks and land use change : a meta analysis , 2022 .

[128]  D. Powlson,et al.  The effects of long continued applications of inorganic nitrogen fertilizer on soil organic nitrogen - a review , 1995 .

[129]  Calliope Panoutsou,et al.  Bioenergy in Greece : Policies, diffusion framework and stakeholder interactions , 2008 .

[130]  Heracles Polatidis,et al.  Renewable energy projects: structuring a multi-criteria group decision-making framework , 2003 .

[131]  V. Smil.  ENERGY IN THE TWENTIETH CENTURY: Resources, Conversions, Costs, Uses, and Consequences , 2000 .

[132]  Tommy Dalgaard,et al.  An indicator-based method for quantifying farm multifunctionality. , 2013 .

[133]  Heather L MacLean,et al.  Life cycle assessment of switchgrass- and corn stover-derived ethanol-fueled automobiles. , 2005, Environmental science & technology.

[134]  Francesco Cherubini,et al.  The biorefinery concept: Using biomass instead of oil for producing energy and chemicals , 2010 .

[135]  A. Gasparatosa,et al.  Choosing the most appropriate sustainability assessment tool , 2012 .

[136]  Bilal Akash,et al.  A neuro-fuzzy program approach for evaluating electric power generation systems , 2001 .

[137]  Tommy Dalgaard,et al.  Life Cycle Assessment of district heat production in a straw fired CHP plant , 2014 .

[138]  David K. Johnson,et al.  Top Value-Added Chemicals from Biomass - Volume II—Results of Screening for Potential Candidates from Biorefinery Lignin , 2007 .

[139]  Carles M. Gasol,et al.  Life cycle assessment of a Brassica carinata bioenergy cropping system in southern Europe. , 2007 .

[140]  E. Løken.  Use of multicriteria decision analysis methods for energy planning problems , 2007 .

[141]  May Wu,et al.  Energy and Emission Benefits of Alternative Transportation Liquid Fuels Derived from Switchgrass: A Fuel Life Cycle Assessment , 2006, Biotechnology progress.

[142]  Jeffrey S. Tolan,et al.  Iogen's Demonstration Process for Producing Ethanol from Cellulosic Biomass , 2008 .

[143]  Brian Vad Mathiesen,et al.  A renewable energy scenario for Aalborg Municipality based on low-temperature geothermal heat, wind , 2010 .

[144]  Y.‐H.P. Zhang.  Reviving the carbohydrate economy via multi-product lignocellulose biorefineries , 2008, Journal of Industrial Microbiology & Biotechnology.

[145]  Joshua A. Schaidle,et al.  Biorefinery sustainability assessment , 2011 .

[146]  Mikael Hildén,et al.  Sustainability through system transformation: lessons from Finnish efforts , 2011 .

[147]  B. Dale,et al.  Life cycle assessment of various cropping systems utilized for producing biofuels: Bioethanol and biodiesel , 2005 .

[148]  Saurabh Gupta,et al.  An overview of sustainability assessment methodologies , 2009 .

[149]  B. Frame,et al.  Accounting technologies and sustainability assessment models , 2007 .

[150]  G. Keoleian,et al.  Life cycle assessment of a willow bioenergy cropping system , 2003 .

[151]  E. Brizio,et al.  LCA of bioenergy chains in Piedmont (Italy): a case study to support public decision makers towards sustainability. , 2011 .

[152]  N. Hanley,et al.  Cost–Benefit Analysis and the Environment , 1994 .

[153]  A. Faaij,et al.  Ethanol from lignocellulosic biomass: techno-economic performance in short-, middle- and long-term , 2005 .

[154]  Finn Joensen,et al.  Biomass to green gasoline and power , 2011 .

[155]  Rasmus Holst.  The Opal - The Danish Society of Engineers, IDA , 2017 .

[156]  H. V. D. Meer,et al.  Optimising manure management for GHG outcomes , 2008 .

[157]  A. Contin,et al.  Complementare/Lezione 2/Top Value-Added Chemicals from Biomass, Volume II: Results of Screening for Potential, Candidates from Biorefinery Lignin, PNNL-16983 (2007) , 2012 .

[158]  G. Rebitzera,et al.  Life cycle assessment Part 1 : Framework , goal and scope definition , inventory analysis , and applications , 2004 .

[159]  D. Reay,et al.  Nitrogen and Biofuels , 2015 .

[160]  Laurens Cherchye,et al.  Creating composite indicators with DEA and robustness analysis: the case of the Technology Achievement Index , 2006, J. Oper. Res. Soc..

[161]  Ayhan Demirbas,et al.  Biofuels sources, biofuel policy, biofuel economy and global biofuel projections , 2008 .

[162]  Geoffrey P. Hammond,et al.  Environmental life cycle assessment of lignocellulosic conversion to ethanol: A review , 2012 .

[163]  L. Schebek,et al.  Environmental impacts of a lignocellulose feedstock biorefinery system: An assessment , 2009 .

[164]  Mikhail L. Rabinovich,et al.  WOOD HYDROLYSIS INDUSTRY IN THE SOVIET UNION AND RUSSIA: A MINI-REVIEW , 2010 .

[165]  B. Kamm,et al.  Principles of biorefineries , 2004, Applied Microbiology and Biotechnology.

[166]  Naim Afgan,et al.  MULTI-CRITERIA ASSESSMENT OF NEW AND RENEWABLE ENERGY POWER PLANTS , 2002 .

[167]  Tommy Dalgaard,et al.  Concepts for a multi-criteria sustainability assessment of a new more biobased economy in rural production landscapes , 2012 .

[168]  Ioannis V. Skiadas,et al.  Toward a common classification approach for biorefinery systems , 2009 .

[169]  Joost G. Vogtländer,et al.  The EVR model for sustainability – A tool to optimise product design and resolve strategic dilemmas , 2001 .

[170]  Julián A. Quintero,et al.  Fuel ethanol production from sugarcane and corn: Comparative analysis for a Colombian case , 2008 .

[171]  Mohini Sain,et al.  Isolation and characterization of nanofibers from agricultural residues: wheat straw and soy hulls. , 2008, Bioresource technology.

[172]  D. Pimentel,et al.  Food Production and the Energy Crisis , 1973, Science.

[173]  Joseph J. Bozell,et al.  Technology development for the production of biobased products from biorefinery carbohydrates—the US Department of Energy’s “Top 10” revisited , 2010 .

[174]  P.J.A. Tijm,et al.  PROCESSES FOR CONVERTING METHANE TO LIQUID FUELS: ECONOMIC SCREENING THROUGH ENERGY MANAGEMENT , 1996 .

[175]  Rocio Sierra,et al.  Short‐term lime pretreatment of poplar wood , 2009, Biotechnology progress.

[176]  Colin Webb,et al.  Cereal-based biorefinery development: utilisation of wheat milling by-products for the production of succinic acid. , 2009, Journal of biotechnology.

[177]  Joost G. Vogtländer,et al.  The virtual eco-costs ‘99 A single LCA-based indicator for sustainability and the eco-costs-value ratio (EVR) model for economic allocation , 2001 .

[178]  J. G. Vogtländer.  The model of the eco-costs/value ratio: A new LCA based decision support tool , 2001 .

[179]  David B. Turley.  The Chemical Value of Biomass , 2008 .

[180]  P. Poulton,et al.  Soil organic matter: its importance in sustainable agriculture and carbon dioxide fluxes. , 2009 .

[181]  E. Marris.  Sugar cane and ethanol: Drink the best and drive the rest , 2006, Nature.

[182]  H. Watson.  Potential to expand sustainable bioenergy from sugarcane in southern Africa , 2011 .

[183]  J. Mclaren.  Crop biotechnology provides an opportunity to develop a sustainable future. , 2005, Trends in biotechnology.

[184]  J. Lange.  Lignocellulose conversion: an introduction to chemistry, process and economics , 2007 .

[185]  B. Weckhuysen,et al.  The catalytic valorization of lignin for the production of renewable chemicals. , 2010, Chemical reviews.