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Publications (10 of 11) Show all publications
Björkmalm, J., Byrne, E., van Niel, E. & Willquist, K. (2018). A non-linear model of hydrogen production by Caldicellulosiruptor saccharolyticus for diauxic-like consumption of lignocellulosic sugar mixtures. Biotechnology for Biofuels, 11, Article ID 175.
Open this publication in new window or tab >>A non-linear model of hydrogen production by Caldicellulosiruptor saccharolyticus for diauxic-like consumption of lignocellulosic sugar mixtures
2018 (English)In: Biotechnology for Biofuels, ISSN 1754-6834, E-ISSN 1754-6834, Vol. 11, article id 175Article in journal (Refereed) Published
Abstract [en]

Background

Caldicellulosiruptor saccharolyticus is an attractive hydrogen producer suitable for growth on various lignocellulosic substrates. The aim of this study was to quantify uptake of pentose and hexose monosaccharides in an industrial substrate and to present a kinetic growth model of C. saccharolyticus that includes sugar uptake on defined and industrial media. The model is based on Monod and Hill kinetics extended with gas-to-liquid mass transfer and a cybernetic approach to describe diauxic-like growth.

Results

Mathematical expressions were developed to describe hydrogen production by C. saccharolyticus consuming glucose, xylose, and arabinose. The model parameters were calibrated against batch fermentation data. The experimental data included four different cases: glucose, xylose, sugar mixture, and wheat straw hydrolysate (WSH) fermentations. The fermentations were performed without yeast extract. The substrate uptake rate of C. saccharolyticus on single sugar-defined media was higher on glucose compared to xylose. In contrast, in the defined sugar mixture and WSH, the pentoses were consumed faster than glucose. Subsequently, the cultures entered a lag phase when all pentoses were consumed after which glucose uptake rate increased. This phenomenon suggested a diauxic-like behavior as was deduced from the successive appearance of two peaks in the hydrogen and carbon dioxide productivity. The observation could be described with a modified diauxic model including a second enzyme system with a higher affinity for glucose being expressed when pentose saccharides are consumed. This behavior was more pronounced when WSH was used as substrate.

Conclusions

The previously observed co-consumption of glucose and pentoses with a preference for the latter was herein confirmed. However, once all pentoses were consumed, C. saccharolyticus most probably expressed another uptake system to account for the observed increased glucose uptake rate. This phenomenon could be quantitatively captured in a kinetic model of the entire diauxic-like growth process. Moreover, the observation indicates a regulation system that has fundamental research relevance, since pentose and glucose uptake in C. saccharolyticus has only been described with ABC transporters, whereas previously reported diauxic growth phenomena have been correlated mainly to PTS systems for sugar uptake.

Keywords
Caldicellulosiruptor saccharolyticus – Hydrogen – Kinetic growth model – Glucose uptake – Xylose uptake – Diauxic
National Category
Microbiology
Identifiers
urn:nbn:se:ri:diva-34067 (URN)10.1186/s13068-018-1171-3 (DOI)2-s2.0-85049011727 (Scopus ID)
Funder
Swedish Energy Agency, 31090-2
Available from: 2018-07-06 Created: 2018-07-06 Last updated: 2019-01-07Bibliographically approved
Byrne, E., Kovacs, K., Van Niel, E. W. J., Willquist, K., Svensson, S.-E. & Kreuger, E. (2018). Reduced use of phosphorus and water in sequential dark fermentation and anaerobic digestion of wheat straw and the application of ensiled steam-pretreated lucerne as a macronutrient provider in anaerobic digestion. Biotechnology for Biofuels, 11(1), Article ID 281.
Open this publication in new window or tab >>Reduced use of phosphorus and water in sequential dark fermentation and anaerobic digestion of wheat straw and the application of ensiled steam-pretreated lucerne as a macronutrient provider in anaerobic digestion
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2018 (English)In: Biotechnology for Biofuels, ISSN 1754-6834, E-ISSN 1754-6834, Vol. 11, no 1, article id 281Article in journal (Refereed) Published
Abstract [en]

Background: Current EU directives demand increased use of renewable fuels in the transportation sector but restrict governmental support for production of biofuels produced from crops. The use of intercropped lucerne and wheat may comply with the directives. In the current study, the combination of ensiled lucerne (Medicago sativa L.) and wheat straw as substrate for hydrogen and methane production was investigated. Steam-pretreated and enzymatically hydrolysed wheat straw [WSH, 76% of total chemical oxygen demand (COD)] and ensiled lucerne (LH, 24% of total COD) were used for sequential hydrogen production through dark fermentation and methane production through anaerobic digestion and directly for anaerobic digestion. Synthetic co-cultures of extreme thermophilic Caldicellulosiruptor species adapted to elevated osmolalities were used for dark fermentation. Results: Based on 6 tested steam pretreatment conditions, 5 min at 200 °C was chosen for the ensiled lucerne. The same conditions as applied for wheat straw (10 min at 200 °C with 1% acetic acid) would give similar sugar yields. Volumetric hydrogen productivities of 6.7 and 4.3 mmol/L/h and hydrogen yields of 1.9 and 1.8 mol/mol hexose were observed using WSH and the combination of WSH and LH, respectively, which were relatively low compared to those of the wild-type strains. The combinations of WSH plus LH and the effluent from dark fermentation of WSH plus LH were efficiently converted to methane in anaerobic digestion with COD removal of 85-89% at organic loading rates of COD 5.4 and 8.5 g/L/day, respectively, in UASB reactors. The nutrients in the combined hydrolysates could support this conversion. Conclusions: This study demonstrates the possibility of reducing the water addition to WSH by 26% and the phosphorus addition by 80% in dark fermentation with Caldicellulosiruptor species, compared to previous reports. WSH and combined WSH and LH were well tolerated by osmotolerant co-cultures. The yield was not significantly different when using defined media or hydrolysates with the same concentrations of sugars. However, the sugar concentration was negatively correlated with the hydrogen yield when comparing the results to previous reports. Hydrolysates and effluents from dark fermentation can be efficiently converted to methane. Lucerne can serve as macronutrient provider in anaerobic digestion. Intercropping with wheat is promising.

Keywords
Alfalfa, Biofuel, Biogas, Caldicellulosiruptor, Co-substrate, Energy crops, Intercropping, Osmotolerance, Thermophilic hydrogen production, UASB, Biofuels, Chemical oxygen demand, Crops, Effluents, Fermentation, Hydrogen production, Methane, Phosphorus, Plants (botany), Straw, Substrates, Anaerobic digestion, Medicago sativa, Triticum aestivum
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-35603 (URN)10.1186/s13068-018-1280-z (DOI)2-s2.0-85054918693 (Scopus ID)
Note

 Funding details: Lunds Universitet; Funding details: 31090‑2, Energimyndigheten;

Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2018-11-12Bibliographically approved
Xie, Y., Björkmalm, J., Ma, C., Willquist, K., Yngvesson, J., Wallberg, O. & Ji, X. (2018). Techno-economic evaluation of biogas upgrading using ionic liquids in comparison with industrially used technology in Scandinavian anaerobic digestion plants. Applied Energy, 227, 742-750
Open this publication in new window or tab >>Techno-economic evaluation of biogas upgrading using ionic liquids in comparison with industrially used technology in Scandinavian anaerobic digestion plants
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2018 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 227, p. 742-750Article in journal (Refereed) Published
Abstract [en]

The process of biogas upgrading with ionic liquids, i.e. pure 1-butyl-3-methylimidazolium bis(trifluoro-methylsulfonyl)imide ([bmim][Tf2N]), aqueous choline chloride/urea (ChCl/Urea), and aqueous 1-allyl-3-methyl imidazole formate ([Amim][HCOO]), was simulated in Aspen Plus and compared with the conventional water scrubbing upgrading technique. The comparisons of the performances on the amount of recirculated solvents and energy usage show the following order: aqueous [Amim][HCOO]<aqueous ChCl/Urea<[bmim][Tf2N]<water. Six different co-digestion plants (anaerobic digestion, AD, plants) were surveyed to acquire data for comparison. The selected plants had different raw biogas production capacities and produced gas with differing methane content. The data confirmed the simulation results that the type of substrate and the configuration of AD process are two factors affecting energy usage, investment cost, as well as operation and maintenance costs for the subsequent biogas upgrading. In addition, the simulation indicated that the energy usage of the ionic liquid-based upgrading was lower than that of the conventional upgrading techniques in Scandinavian AD plants. The estimated cost including investment, operation and maintenance for the ionic liquid technology showed to be lower than that for the water scrubbing upgrading process.

Keywords
Anaerobic digestion, Biogas upgrading, Ionic liquids, Process simulation, Techno-economic evaluation, Biogas, Computer software, Costs, Economic analysis, Energy utilization, Gas plants, Investments, Liquids, Choline chloride, Estimated costs, Investment costs, Ionic liquid technology, Operation and maintenance, Process simulations
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-31131 (URN)10.1016/j.apenergy.2017.07.067 (DOI)2-s2.0-85026290782 (Scopus ID)
Available from: 2017-08-28 Created: 2017-08-28 Last updated: 2019-07-01Bibliographically approved
Ekman Nilsson, A., Macias Aragones, M., Arroyo Torralvo, F., Dunon, V., Angel, H., Komnitsas, K. & Willquist, K. (2017). A review of carbon footprint of Cu and Zn production from primary and secondary sources. Minerals, 7(9), 168
Open this publication in new window or tab >>A review of carbon footprint of Cu and Zn production from primary and secondary sources
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2017 (English)In: Minerals, ISSN 2075-163X, E-ISSN 2075-163X, Vol. 7, no 9, p. 168-Article in journal (Refereed) Published
Abstract [en]

Copper (Cu) and zinc (Zn) with their unique propertiesare central for economic growth, quality of life and creation of new jobs. The base-metalproducing sector is, however, under growing public pressure in respect toenergy and water requirements and needs to meet several challenges, includingincreased demand and lower ore grades generally associated with larger resourceuse. The development of technologies for metal production from secondarysources is often motivated by increased sustainability and this paper aims to providefurther insights about one specific aspect of sustainability, namely climatechange. The paper presents a review of carbon footprints (CF) for Cu and Znproduced from primary and secondary raw materials, by analyzing data taken fromscientific literature and the Ecoinvent database. Comparisons are carried outbased on the source of data selected as reference case. In the case of Cu,reduced CF of secondary production is indicated, although there is large datavariation. As for Zn, production of this metal from secondary sources seems to bebeneficial but the number of data and cases to be compared is much smallercompared to Cu. The general variation of data suggests that standardization ofcomparison is needed when assessing the environmental benefits of production inline with the principles of waste valorization, zero waste approach andcircular economy.

Keywords
Cu; Zn; circular economy; carbon footprint; mining; secondary materials; Ecoinvent database
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-33286 (URN)10.3390/min7090168 (DOI)2-s2.0-85031404282 (Scopus ID)
Projects
H2020 METGROWplus
Available from: 2018-02-20 Created: 2018-02-20 Last updated: 2019-02-05Bibliographically approved
Willquist, K., Werker, A., Bengtsson, S., Persson, M., Pawar, S. & van Niel, E. (2017). Bioplastogen: Innovativ produktion av biologisk vätgas med plaster från svartlut. Energimyndigheten
Open this publication in new window or tab >>Bioplastogen: Innovativ produktion av biologisk vätgas med plaster från svartlut
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2017 (Swedish)Report (Other academic)
Alternative title[en]
Bioplastogen: Innovative production of biohydrogen with bioplastics from black liquor
Abstract [sv]

Detta hypotestestförprojekt har haft som mål att validera potentialen för ett nyttmultifunktionellt kaskadbioraffinaderi som producerar fyra viktigaplattformsprodukter från ett Kraftverk: cellulosa, lignobränsle, biovätgas ochbiopolymer. Eftersom cellulosa- och ligninproduktionslinjer är väl karakteriseradefokuserar Bioplastogen på att utvärdera och identifiera möjligheter ochutmaningar vid vätgas- och bioplastproduktion från hemicellulosarestprodukter.Utförandet har varit indelat i tre faser dvs 1) identifierandet av hemicellulosarikaströmmar för biovätgasprocessen, 2) fermenteringexperiment för produktion avvätgas och organisk syra, 3) omvandling av organisk syra till PHA genomaktiverat slam. Valet av hemicellulosafraktion baserades på ett litteraturstudieoch genom diskussioner med personal på olika bruk och på LignoBoostpilotanläggning. Eftersom Lignoboost restprodukt har alternativaanvändningsområdet och hög halt inhibitorer togs ett beslut att användahemicellulosa som extraheras innan den blir en del av svartlut.Hemicellulosafraktionen bestod av 19g/L organiskt material varav sockerarternafrämst var pentoser. Fraktionens effekt på vätgasproduktionen utvärderas iserumflaskor och bioreaktorer med osmotoleranta stammar avCaldicellulosiruptor sacchrolyticus. Bioprocessen utvecklades även förindustriella applikation. Försök i serumflaskor visade potential förbiovätgasproduktion som inte kunde replikeras i reaktorsförsöken. Förslag på nystrategi för att förbättra biovätgasproduktionen också i reaktorförsken kan vara attantinger anpassa mikroorganismerna till de nya substraten och/eller att användablandkulturer som kan vara mer robusta mot denna typ av substrat.Den organiska biprodukten från biovätgasprocessen användes förbiopolymerproduktionsprocessen. Två olika slam från Sjölundavattenreningsanläggning användes och visade en bra potential genom attackumulera mer än 25% av gPHA/gVSS. Detta resultat stärkte projekthypotesen.Nästa steg blir att använda ett acklimatiserat slam från biologisk vattenrening frånett pappersmassabruk.Genom Bioplastogen har vi stärkt våra hypoteser men också identifieradestrategier för fortsatt förbättring som förhoppningsvis kan bli implementerade iansökt fortsättningsprojekt – HyPer

Abstract [en]

This hypothesis testing project has been with aim to validate potential for a novelmultipurpose cascading biorefinery, producing four principal platform productswithin a Kraft pulp mill: cellulose, lignofuels, biohydrogen and biopolymers.Cellulose and lignin product lines are presently well characterized at commercialscale. The project was, therefore, focused on evaluating and identifyingopportunities and challenges in processes for biohydrogen and biopolymersproduction from mill hemicellulose residuals.The project undertaking comprised three phases: determining the hemicelluloserich stream (HRS) to use, fermentation of sugars to hydrogen gas and organicacids, and conversion of organic acids to PHA by activated sludge. A literaturesurvey and discussions with the experts at various pulp and paper industries in theKarlstad region, as well as the developers of LignoBoost technology at Innventiaclearly mark the challenges of using black liquor directly as the HRS. Thesechallenges can be avoided by pre-extraction of the hemicellulose residual massvia ‘autohydrolysis’ of wood before the Kraft process. Hence, the residualhemicellulose before it enters the black liquor was the selected HRS.The HRS contained about 19 g/L of organics comprising of mainly pentose sugarsand organic acids along with some soluble lignin. A number of batch experimentswere performed in flasks that confirmed potential for H2 production by anosmotolerant strain (CSG5) of Caldicellulosiruptor sacchrolyticus. Experimentswere also performed in a fed-batch bioreactor. Here practical advancement wasmade with respect to process developments for industrial applications. However,no significant growth or H2 production was observed when permeate was added tothe reactor. This outcome was considered in hindsight to be due to an unforeseenoutcome of headspace partial pressure generated by the experimental set up.Nevertheless, given the HRS strategy and first positive indicators from batchexperiments, next steps to establish the industrial methods for conversion ofautohydrolysis hemicellulose residuals to H2 were recommended based onadaptation of the strain to the feed and/or application of co-culture bioprocessengineering.The effluent from biohydrogen production feeds a biopolymer production process.Two distinct sludge samples were sourced from municipal water treatment atSjölunda to evaluate polyhydroxyalkanoates (PHA) accumulation potential. Themixed cultures naturally accumulated a moderate level of more than 25% ofgPHA/gVSS. The conversion of the organic matter in the HRS stream into PHAwas successfully observed thus supporting the project hypothesis. Similarly to thebiohydrogen outcome, next steps will entail the development of an acclimatedenrichment PHA producing biomass from Kraft mill industry wastewaterbiological treatment.Through this work steps were made that strengthened the ideas as well as thestrategy forward which are to be implemented through the forthcoming proposedproject – HyPer.

Place, publisher, year, edition, pages
Energimyndigheten, 2017. p. 58
Keywords
Biohydrogen, bioplastics, black liquor, autohydrolysis
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-33287 (URN)
Projects
Bioplastogen43975-1
Funder
Swedish Energy Agency, 43975-1
Note

The report is available at:

http://www.energimyndigheten.se/forskning-och-innovation/projektdatabas/sokresultat/?projectid=25262

Available from: 2018-02-20 Created: 2018-02-20 Last updated: 2018-08-13Bibliographically approved
Jannasch, A.-K. & Willquist, K. (2017). EN KUNSKAPSSYNTES OM ELEKTROBRÄNSLEN FRÅN BIOLOGISKA PROCESSER.
Open this publication in new window or tab >>EN KUNSKAPSSYNTES OM ELEKTROBRÄNSLEN FRÅN BIOLOGISKA PROCESSER
2017 (Swedish)Report (Refereed)
Abstract [sv]

Sverige har som mål att ha 100% förnybar kraftproduktion år 2040. Detta skall uppnås genom attbl.a. kraftigt bygga ut den intermittenta kraftproduktionen med t.ex. vindkraft. En ökad andel vindkraftställer dock krav på en ökad tillgång av energilagring och balans- och/eller reglerkraft. Detfinns också andra svenska högt uppsatta miljö- och klimatmål samt ambitioner såsom fossiloberoendetransportsektor 2030, ett koldioxidneutralt samhälle 2045 och att Sverige skall bli ledande påatt ta hand om och återanvända sitt avfall i en cirkulär ekonomi.Kombinationen power-to-gas och biogasproduktion kan på olika sätt bidra till att nå samtliga ovanbeskrivna mål genom att göra det framtida elsystemet flexiblare samtidigt som tillgänglig biomassa,t.ex. gödsel och biologisk nedbrytbart avfall, utnyttjas mer effektivt för ökad produktion avförnybara drivmedel och/eller kemikalier från samma mängd biogassubstrat. Konceptet bygger påatt omvandla billig förnybar el, via elektrolys, till vätgas (dvs. power-to-gas) som tillåts reagera vidaremed koldioxiden i rå biogas via s.k. elektrobränsleprocesser.Det finns idag både termokemiska och biologiska elektrobränsleprocesser för metanproduktion.Det finns också biologisk gasfermentering för produktion av flytande elektrobränslen, t.ex. bioalkoholer.Bland biogasproducenter finns idag ett växande intresse för de olika elektrobränsleprocessernaeftersom de på sikt skulle kunna ge mer lönsamma, produktflexibla och mindre marknadskänsligabiogasanläggningar. Den allmänna uppfattningen hos den svenska biogasbranschen ärdock att det är svårt att på ett lättillgängligt sätt få grepp om vad den teknoekonomiska prestandanoch mognadsgraden för de olika elektrobränsleprocesserna idag är, särskilt vad gäller de biologiska.Denna kunskapssyntes syftar till att tillgodose detta behov och innefattar elektrobränsleprocessernain-situ och ex-situ metanisering samt biologisk gasfermentering, samt med termokemisk metaniseringsom referensprocess. Möjligheten att kombinera elektrobränsleprocesserna med och/ellerersätta konventionell biogasuppgradering undersöks och diskuteras också. De huvudsakliga slutsatsernai studien summeras nedan.Genom att utnyttja billig el och elektrobränsleprocesser i kombination med koldioxidöverskott frånbiogasproduktion kan metanproduktionen från en och samma mängd substrat öka upp till det dubbla.Samtidigt kan konventionell biogasuppgradering för biometanproduktion slopas under förutsättningatt tillräcklig mängd vätgas finns tillgänglig. Den stora utmaningen för denna process ärdock kostnaden och det finns behov av fortsatt FoU inom området för att elektrobränsleprocessernaskall kunna bli ett kostnadsekonomiskt alternativ för svenska biogasproducenter.Av de undersökta elektroprocesserna är termokemisk metanisering den mest mogna tekniken(Technology Readiness Level, TRL=7-8). Processen bygger på termokatalytisk omvandling och äreffektiv, generar högvärdig värme och kan ersätta konventionell biogasuppgradering förutsatt tillgångpå tillräcklig mängd vätgas. Processen är dessutom snabb och reaktorerna som placeras nedströms(ex-situ) biogasreaktorn är kompakta. En primär utmaning med processen är dock att katalysatorernaär känsliga för vanligt förekommande biogasföroreningar (t.ex. svavel), vilket gör attuppströms gasrening krävs. En annan utmaning är att processen sker vid hög temperatur (300-700°C) och tryck (vanligtvis ≤20 bar) vilket medför att uppstartstiden från kallt tillstånd blir relativtlång (timmar). Processen har slutligen relativt låg tolerans mot svängningar i gaskvalité (H2:CO2)och variationer i temperatur vilket medför att uppströms vätgaslager behövs vid intermittent drift.Vid biologisk metanisering (in-situ och ex-situ) omvandlas koldioxid och vätgas till metan medhjälp av mikroorganismer. Ingen katalysator behövs och mikroorganismerna är självproducerande.Reaktionen sker vanligtvis vid atmosfärstryck och låg temperatur (37-60°C). Tack vare den lågadrifttemperaturen är uppstartstiden från kallt tillstånd snabb (minuter). Processerna har, i motsatstill termokemisk metanisering, också mycket hög tolerans mot gasföroreningar (sulfider) och ingeneller mycket begränsad uppströms gasrening krävs.I likhet med termokemisk metanisering är ex-situ biologisk metanisering effektiv och kan ersättakonventionell biogasuppgradering. Till skillnad mot termokemisk metanisering är processen tolerantmot svängningar i gassammansättning (H2:CO2) och kan köras intermittent utan uppströmsvätgaslager. Processen är däremot långsam och kräver betydligt mer voluminösa reaktorer (10-1000 ggr större än vid termokemisk). Ex-situ biologisk metanisering är mindre mogen än termokemiskmetanisering (TRL=6-7).Vid In-situ metanisering tillförs vätgasen direkt till rötningskammaren och önskvärd metaniseringsker parallellt med biogasprocessen. Detta innebär att inte behöver investera i någon separat kostsammetaniseringsreaktor. Nackdelen är att det finns begränsade möjligheter till att ändra och optimeradriftbetingelserna (T, p, omrörning) mot metaniseringsprocessen utan att störa rötningsprocessen.Omvandlingseffektiviteten blir därför betydligt lägre än för ex-situ metanisering (från 52till 75% metanhalt har som bäst demonstrerats) och processen kan inte ersätta konventionell biogasuppgradering.En annan utmaning är att processen är känslig för vätgasinhibering vilket innebäratt vätgaslager behövs uppströms rötningskammaren vid intermittent drift. Mognadsgraden är lägreän för både termokemisk och ex-situ biologisk metansiering (TRL=4-5).Biologisk gasfermentering ökar flexibiliteten hos en biogasanläggning och kan minska risken avinvesteringen eftersom processen kan anpassas till marknadsdrivkrafter. Flexibiliteten begränsasdock av kostnaden för produktuppgraderingen där etanol t.ex kräver dyrare och en annan typ avuppgradering än vad t.ex långa fettsyror gör. I jämförelse med metanisering är det en fördel medproduktion av flytande bränslen när en anläggning ligger långt från en existerande gasinfrastruktur.Idag produceras främst etanol kommersiellt, men forskning och utveckling för produktion av långafettsyror och butanediol pågår. Dessa produkter har ett högre marknadsvärde och medför en merkostnadseffektiv uppgradering. Teknikutvecklingen och kommersialiseringen har utgått från fermenteringav syngas från förgasning och koldioxid från stålindustrin. Produktionen av koldioxidfrån svenska biogasanläggningar uppskattas vara ca en tiondel för låg för att en kostnadseffektivetanolproduktion skall kunna vara möjlig. Processen bedöms därför vara den minst mogna av deundersökta alternativen (TRL=2-4). I övrigt är gasfermentering en biologisk process som inneharliknande fördelar och utmaningar som beskrivits ovan för biologisk ex-situ metanisering.

Publisher
p. 54
Series
f3 Svenskt kunskapcentrum för förnybara transportbränslen ; f32017:03
Keywords
biogas, elektrobränslen
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-29210 (URN)
Available from: 2017-04-04 Created: 2017-04-04 Last updated: 2018-08-16Bibliographically approved
Henriksson, G., Willquist, K., Björkmalm, J., Johansson, I., Hedenstedt, A. & Kjerstadius, H. (2015). Benchmarking av gödselsamrötning med avloppsslam mot förbränning av häst- och djurparksgödsel (ed.). Paper presented at .
Open this publication in new window or tab >>Benchmarking av gödselsamrötning med avloppsslam mot förbränning av häst- och djurparksgödsel
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2015 (Swedish)Report (Refereed)
Abstract [sv]

Owners of stables and owners of zoos have difficulty finding an economically sustainable deposition of their produced manure. More than two million tons of horse manure are produced in urban environments in Sweden every year. If the manure cannot be used as fertilizer on farm land it is classified as a waste fraction and should be handled according to current regulations. The manure is a valuable waste fraction that contains both energy and nutrients. If the manure cannot be spread on farm land more applications need to be identified, where the energy and nutrients in the manure can be used. The focus in this study is to investigate possible applications for the usage of horse and zoo manure within Borås municipality where, among other things, a waste water treatment plant and a combined heat and power plant are available. Horse and zoo manure have been investigated in the following applications: co-digestion with sewage sludge at a waste water treatment plant (lab experiments), co-digestion with food waste (theoretical), co-incineration with waste (full scale) and co-incineration with biomass (theoretical). Potential quantity of manure and economical and legal aspects have been studied as well. There is no compilation of the number of horses in the country which makes it hard to estimate the true quantity of manure. The quantity of manure from the zoos are somewhat easier to estimate since the zoo owners are fewer and have knowledge of their manure production. The co-digestions experiments in this study showed that addition of horse manure to digestion can be of interest in many ways, among other things it can give a more stable biogas production and a possible decrease in the Cd/P-ratio in the end product. Horse manure turned out to have a faster degradation rate compared to zoo manure, however the degradation rate was lower than that of sewage sludge. Zoo manure gave a relatively low biogas production compared to horse manure at thermophilic conditions. The co-incineration trial with waste and manure gave no negative effect with regard to emissions and operation. However, the amount of manure added to the incineration trial was low. The theoretical studies regarding the co-incineration with biomass, showed two potential alternatives that need to be investigated further. Interesting aspects to look further upon, based on this study, are for example: • Laws and regulations in the EU regarding manure. • Co-digestion of manure and sewage sludge in a larger scale. • Laws and regulations and costs regarding incineration of manure with biomass.

Series
SP Rapport, ISSN 0284-5172 ; 2015:11
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-5243 (URN)20373 (Local ID)978-91-88001-41-2 (ISBN)20373 (Archive number)20373 (OAI)
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2018-08-17Bibliographically approved
Willquist, K., Björkmalm, J., Sjöstrand, K., Lagerkvist, A., Erixon, R., Johansson, B., . . . Liu, J. (2015). Biological treatment toolbox for Swedish mine drainage (ed.). Paper presented at .
Open this publication in new window or tab >>Biological treatment toolbox for Swedish mine drainage
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2015 (English)Report (Refereed)
Publisher
p. 76
Series
SP Rapport, ISSN 0284-5172 ; 2015:18
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-5250 (URN)20479 (Local ID)978-91-88001-48-1 (ISBN)20479 (Archive number)20479 (OAI)
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2019-06-20Bibliographically approved
Holgersson, P. & Willquist, K. (2014). Benchmarking the biogas value chain in Sweden and Canada and knowledge transfer between the two countries (ed.). Paper presented at .
Open this publication in new window or tab >>Benchmarking the biogas value chain in Sweden and Canada and knowledge transfer between the two countries
2014 (English)Report (Refereed)
Series
Country report f3.
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-5641 (URN)28126 (Local ID)28126 (Archive number)28126 (OAI)
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2018-08-13Bibliographically approved
Willquist, K., Ekman, A., Landquist, B. & Lantz, M. (2014). Bioraffinaderi i Skåne: en pusselbit för hållbar regional utveckling (ed.). Paper presented at .
Open this publication in new window or tab >>Bioraffinaderi i Skåne: en pusselbit för hållbar regional utveckling
2014 (Swedish)Report (Refereed)
Series
SP Rapport, ISSN 0284-5172 ; 2014:60
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-5215 (URN)16727 (Local ID)978-91-88001-04-7 (ISBN)16727 (Archive number)16727 (OAI)
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2018-08-13Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0359-3652

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