Effects of steam pretreatment and co-production with ethanol on the energy efficiency and process economics of combined biogas, heat and electricity production from industrial hemp

Biotechnology for Biofuels

Lovisa Björnsson²  Emma Kreuger¹  Zsolt Barta³ 

[1]Biotechnology, Lund University, P.O. Box 124, Lund, SE-221 00, Sweden

[2]Environmental and Energy Systems Studies, Lund University, P.O. Box 118, Lund, SE-221 00, Sweden

[3]Department of Applied Biotechnology and Food Science, Budapest University of Technology and Economics, Szt. Gellérttér 4, Budapest, H-1111, Hungary

关键词: Modelling;    Simulation;    Process design;    Methane;    Economy;    Bioenergy;    Biofuel;    Energy crop;    Cannabis sativa L.;   

Others  :  798093
DOI  :  10.1186/1754-6834-6-56

 received in 2012-10-04, accepted in 2013-04-08,  发布年份 2013

【 摘 要 】

Background

The study presented here has used the commercial flow sheeting program Aspen Plus™ to evaluate techno-economic aspects of large-scale hemp-based processes for producing transportation fuels. The co-production of biogas, district heat and power from chopped and steam-pretreated hemp, and the co-production of ethanol, biogas, heat and power from steam-pretreated hemp were analysed. The analyses include assessments of heat demand, energy efficiency and process economics in terms of annual cash flows and minimum biogas and ethanol selling prices (MBSP and MESP).

Results

Producing biogas, heat and power from chopped hemp has the highest overall energy efficiency, 84% of the theoretical maximum (based on lower heating values), providing that the maximum capacity of district heat is delivered. The combined production of ethanol, biogas, heat and power has the highest energy efficiency (49%) if district heat is not produced. Neither the inclusion of steam pretreatment nor co-production with ethanol has a large impact on the MBSP. Ethanol is more expensive to produce than biogas is, but this is compensated for by its higher market price. None of the scenarios examined are economically viable, since the MBSP (EUR 103–128 per MWh) is higher than the market price of biogas (EUR 67 per MWh). The largest contribution to the cost is the cost of feedstock. Decreasing the retention time in the biogas process for low solids streams by partly replacing continuous stirred tank reactors by high-rate bioreactors decreases the MBSP. Also, recycling part of the liquid from the effluent from anaerobic digestion decreases the MBSP. The production and prices of methane and ethanol influence the process economics more than the production and prices of electricity and district heat.

Conclusions

To reduce the production cost of ethanol and biogas from biomass, the use of feedstocks that are cheaper than hemp, give higher output of ethanol and biogas, or combined production with higher value products are primarily suggested. Further, practical investigations on increased substrate concentration in biogas and ethanol production, recycling of the liquid in anaerobic digestion and separation of low solids flows into solid and a liquid fraction for improved reactor applications deserves further attention.

【 授权许可】

   
2013 Barta et al.; licensee BioMed Central Ltd.

【 图 表 】

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【 参考文献 】

• [1]European Environment Agency: How much bioenergy can Europe produce without harming the environment?. Copenhagen: EEA; 2006. [EEA Report 7/2006]
• [2]Kreuger E, Prade T, Escobar F, Svensson SE, Englund JE, Björnsson L: Anaerobic digestion of industrial hemp-Effect of harvest time on methane energy yield per hectare. Biomass Bioenergy 2011, 35:893-900.
• [3]Kreuger E, Sipos B, Zacchi G, Svensson SE, Björnsson L: Bioconversion of industrial hemp to ethanol and methane: The benefits of steam pretreatment and co-production. Bioresour Technol 2011, 102:3457-3465.
• [4]Sipos B, Kreuger E, Svensson S-E, Réczey K, Björnsson L, Guido Z: Steam pretreatment of dry and ensiled industrial hemp for ethanol production. Biomass Bioenergy 2010, 34:1721-1731.
• [5]Börjesson P, Tufvesson LM: Agricultural crop-based biofuels - resource efficiency and environmental performance including direct land use changes. J Clean Prod 2011, 19:108-120.
• [6]van der Werf HMG: Life Cycle Analysis of field production of fibre hemp, the effect of production practices on environmental impacts. Euphytica 2004, 140:13-23.
• [7]Prade T, Svensson SE, Andersson A, Mattsson JE: Biomass and energy yield of industrial hemp grown for biogas and solid fuel. Biomass Bioenergy 2011, 35:3040-3049.
• [8]van der Werf HMG, van Geel WCA, Wijlhuizen M: Agronomic research on hemp (Cannabis sativa L.) in The Netherlands, 1987–1993. J Int Hemp Assoc 1995, 2:14-17.
• [9]Amaducci S, Zatta A, Raffanini M, Venturi G: Characterisation of hemp (Cannabis sativa L.) roots under different growing conditions. Plant Soil 2008, 313:227-235.
• [10]Cappelletto P, Brizzi M, Mongardini F, Barberi B, Sannibale M, Nenci G, Poli M, Corsi G, Grassi G, Pasini P: Italy-grown hemp: yield, composition and cannabinoid content. Ind Crop Prod 2001, 13:101-113.
• [11]Struik PC, Amaducci S, Bullard MJ, Stutterheim NC, Venturi G, Cromack HTH: Agronomy of fibre hemp (Cannabis sativa L.) in Europe. Ind Crop Prod 2000, 11:107-118.
• [12]Pahkala K, Pahkala E, Syrjälä H: Northern Limits to Fiber Hemp Production in Europe. J Ind Hemp 2008, 13:104-116.
• [13]Walla C, Schneeberger W: The optimal size for biogas plants. Biomass Bioenergy 2008, 32:551-557.
• [14]Smyth BM, Smyth H, Murphy JD: Can grass biomethane be an economically viable biofuel for the farmer and the consumer? Biofuels Bioproducts & Biorefining-Biofpr 2010, 4:519-537.
• [15]Sassner P, Galbe M, Zacchi G: Techno-economic evaluation of bioethanol production from three different lignocellulosic materials. Biomass Bioenergy 2008, 32:422-430.
• [16]Barta Z, Réczey K, Zacchi G: Techno-economic evaluation of stillage treatment with anaerobic digestion in a softwood-to-ethanol process. Biotechnol Biofuels 2010, 3:21. BioMed Central Full Text
• [17]Shafiei M, Karimi K, Taherzadeh MJ: Techno-economical study of ethanol and biogas from spruce wood by NMMO-pretreatment and rapid fermentation and digestion. Bioresour Technol 2011, 102:7879-7886.
• [18]Lohrasbi M, Pourbafrani M, Niklasson C, Taherzadeh MJ: Process design and economic analysis of a citrus waste biorefinery with biofuels and limonene as products. Bioresour Technol 2010, 101:7382-7388.
• [19]Lee PH, Bae J, Kim J, Chen WH: Mesophilic anaerobic digestion of corn thin stillage: a technical and energetic assessment of the corn-to-ethanol industry integrated with anaerobic digestion. J Chem Technol Biotechnol 2011, 86:1514-1520.
• [20]McEniry J, O'Kiely P, Crosson P, Groom E, Murphy JD: The effect of feedstock cost on biofuel cost as exemplified by biomethane production from grass silage. Biofuels Bioproducts & Biorefining-Biofpr 2011, 5:670-682.
• [21]Nguyen MH, Prince RGH: A simple rule for bioenergy conversion plant size optimisation: Bioethanol from sugar cane and sweet sorghum. Biomass Bioenergy 1996, 10:361-365.
• [22]Barta Z, Kovács K, Réczey K, Zacchi G: Process design and economics of on-site cellulase production on various carbon sources in a soft-wood-based ethanol plant. Enzym Res 2010, 734182: .
• [23]Sassner P, Zacchi G: Integration options for high energy efficiency and improved economics in a wood-to-ethanol process. Biotechnol Biofuels 2008, 1(4):1-11.
• [24]Svahn J: Energioptimering av biogasproduktion, hur primärenergibehovet kan minskas med energiåtervinning och isolering, Master thesis. Umeå University; 2006.
• [25]Ljunggren M, Zacchi G: Techno-Economic Evaluation of a Two-Step Biological Process for Hydrogen Production. Biotechnol Prog 2010, 26:496-504.
• [26]Brown BB, Yiridoe EK, Gordon R: Impact of single versus multiple policy options on the economic feasibility of biogas energy production: Swine and dairy operations in Nova Scotia. Energy Policy 2007, 35:4597-4610.
• [27]Yiridoe EK, Gordon R, Brown BB: Nonmarket cobenefits and economic feasibility of on-farm biogas energy production. Energy Policy 2009, 37:1170-1179.
• [28]Georgakakis D, Christopoulou N, Chatziathanassiou A, Venetis T: Development and use of an economic evaluation model to assess establishment of local centralized rural biogas plants in Greece. Appl Biochem Biotechnol 2003, 109:275-284.
• [29]Higham I: Economics of anaerobic digestion of agricultural waste. AEA Technology Environment; 1998:1-13. [Economics of anaerobic digestion of agricultural waste]
• [30]Ekman A, Wallberg O, Joelsson E, Borjesson P: Possibilities for sustainable biorefineries based on agricultural residues - a case study of potential straw-based ethanol production in Sweden. Appl Energy 2013, 102:299-308.
• [31]ICIS. 2012. http://www.icis.com webcite
• [32]Sunivo. 2012. http://www.sunivo.com webcite
• [33]Barta Z, Oliva JM, Ballesteros I, Dienes D, Ballesteros M, Réczey K: Refining Hemp Hurds into Fermentable Sugars or Ethanol. Chem Biochem Eng Q 2010, 24:331-339.
• [34]Nges I, Björn A, Björnsson L: Stable operation during pilot-scale anaerobic digestion of nutrient-supplemented maize/sugar beet silage. Bioresour Technol 2012, 118:445-454.
• [35]The Commision of the European communitites: Commission regulation (EC) No 152/2009 of 27 January 2009 laying down the methods of sampling and analysis for the official control of feed. Off J Eur Union 2009, L54:1-130.
• [36]Kaparaju P, Ellegaard L, Angelidaki I: Optimisation of biogas production from manure through serial digestion: Lab-scale and pilot-scale studies. Bioresour Technol 2009, 100:701-709.
• [37]Speece RE: Nutrient requirements. In Anaerobic digestion of biomass. Edited by Chynoweth D, Isaacson R. Cambridge: Elsevier Applied Science; 1988.
• [38]Gerardi M: The microbiology of anaerobic digesters. Hoboken: Wiley; 2003.
• [39]Gustavsson J, Svensson BH, Karlsson A: The feasibility of trace element supplementation for stable operation of wheat stillage-fed biogas tank reactors. Water Sci Technol 2011, 64:320-325.
• [40]Dachs G, Rehm W: Eigenstromverbrauch von Biogasanlagen und potenziale zu dessen reduzierung . München: Solarenergieförderverein Bayern e.V; 2006:1-41.
• [41]Wingren A, Galbe M, Roslander C, Rudolf A, Zacchi G: Effect of reduction in yeast and enzyme concentrations in a simultaneous-saccharification-and-fermentation-based bioethanol process - Technical and economic evaluation. Appl Biochem Biotechnol 2005, 121:485-499.
• [42]Wingren A, Galbe M, Zacchi G: Techno-economic evaluation of producing ethanol from softwood: Comparison of SSF and SHF and identification of bottlenecks. Biotechnol Prog 2003, 19:1109-1117.
• [43]Wingren A, Galbe M, Zacchi G: Energy considerations for a SSF-based softwood ethanol plant. Bioresour Technol 2008, 99:2121-2131.
• [44]Tiwari MK, Guha S, Harendranath CS, Tripathi S: Influence of extrinsic factors on granulation in UASB reactor. Appl Microbiol Biotechnol 2006, 71:145-154.
• [45]Torry-Smith M, Sommer P, Ahring BK: Purification of bioethanol effluent in an UASB reactor system with simultaneous biogas formation. Biotechnol Bioeng 2003, 84:7-12.
• [46]Swedish Board of Agriculture, Statistics Sweden: Yearbook of agricultural statistics 2011, including food statistics. Örebro: Statistics Sweden; 2011.
• [47]Overend RP: The average haul distance and transportation work factors for biomass delivered to a central plant. Biomass 1982, 2:75-79.
• [48]Börjesson P, Gustavsson L: Regional production and utilization of biomass in Sweden. Energy 1996, 21:747-764.
• [49]Swensson C: Majsensilage i Sverige - reflektioner. In Forage Maize in the Nordic countries. Umeå, Sweden: ; 2010. http://www.slu.se/sv/fakulteter/nl-fakulteten/om-fakulteten/institutioner/institutionen-for-norrlandskt-jordbruksvetenskap/publikationer/tidigare-seminarier/forage-maize-in-the-nordic-countries/ webcite
• [50]Wooley R, Putsche V: Development of an ASPEN PLUS physical property database for biofuels components. Golden: National Renewable Energy Laboratory; 1996:1-38. [MP-425-20685]
• [51]Peters M, Timmerhaus K, West R: Plant design and economics for chemical engineers. New Tork: McGraw-Hill; 2004.