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Horse manure as feedstock for anaerobic digestion
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Environmental engineering.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Environmental engineering.ORCID iD: 0000-0002-5661-2917
2016 (English)In: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 65, 506-518 p.Article in journal (Refereed) Published
Abstract [en]

Horse keeping is of great economic, social and environmental benefit for society, but causes environmental impacts throughout the whole chain from feed production to manure treatment. According to national statistics, the number of horses in Sweden is continually increasing and is currently approximately 360,000. This in turn leads to increasing amounts of horse manure that have to be managed and treated. Current practices could cause local and global environmental impacts due to poor performance or lack of proper management. Horse manure with its content of nutrients and organic material can however contribute to fertilisation of arable land and recovery of renewable energy following anaerobic digestion. At present anaerobic digestion of horse manure is not a common treatment. In this paper the potential for producing biogas and biofertiliser from horse manure is analysed based on a thorough literature review in combination with mathematical modelling and simulations. Anaerobic digestion was chosen as it has a high degree of resource conservation, both in terms of energy (biogas) and nutrients (digestate). Important factors regarding manure characteristics and operating factors in the biogas plant are identified. Two crucial factors are the type and amount of bedding material used, which has strong implications for feedstock characteristics, and the type of digestion method applied (dry or wet process). Straw and waste paper are identified as the best materials in an energy point of view. While the specific methane yield decreases with a high amount of bedding, the bedding material still makes a positive contribution to the energy balance. Thermophilic digestion increases the methane generation rate and yield, compared with mesophilic digestion, but the total effect is negligible.

Place, publisher, year, edition, pages
2016. Vol. 65, 506-518 p.
Keyword [en]
Horse manure, Bedding, Anaerobic digestion, SS-AD, Methane potential, Feedstock, Operating factor, Biogas, Digestate, BMP, Co-digestion
National Category
Environmental Engineering
Identifiers
URN: urn:nbn:se:hig:diva-22230DOI: 10.1016/j.wasman.2016.06.023ISI: 000383827700056PubMedID: 27396682Scopus ID: 2-s2.0-85004130281OAI: oai:DiVA.org:hig-22230DiVA: diva2:953102
Available from: 2016-08-16 Created: 2016-08-16 Last updated: 2017-01-10Bibliographically approved
In thesis
1. Anaerobic digestion of horse manure: renewable energy and plant nutrients in a systems perspective
Open this publication in new window or tab >>Anaerobic digestion of horse manure: renewable energy and plant nutrients in a systems perspective
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In horse keeping horse manure is produced, which can be utilized as a fertilizer or considered a waste. Horse manure constitutes a resource in terms of both plant nutrients and energy. In addition energy policies and objectives aim at replacing fossil fuels with renewable energy sources. The interest to improve resource recovery of horse manure increases due various incentives for renewable vehicle fuels, legal requirements on management of manure, and environmental impact from current horse manure management.

This thesis aims at describing horse manure management in a life cycle perspective. This is made by (1) identifying factors in horse keeping affect­ing the possibility to use horse manure as a biogas feedstock and to recycle plant nutrients, (2) analysing factors in anaerobic digestion with influence on methane potential and biofertilizer nutrient content and (3) comparing the environmental impact from different horse manure treatment methods. Literature reviews, systematic combining, and simulations have been used as research methods.

The results show that horse keeping activities such as feeding, indoor keeping, outdoor keeping and manure storage affect the amount and charac­teristics of horse manure and thereby also the possibilities for anaerobic digestion horse manure. Transport affects the collected amount and spread­ing affects loss of nutrients and nutrient recycling. Simulation results in­dicate the highest methane yield and energy balance from paper bedding, while straw and peat gave a higher nutrient content of the biofertilizer. The highest methane yield was achieved with a low rate of bedding, which in the cases of woodchips and paper is also preferable for plant nutrient recycling. Still, results indicate the best energy balance from anaerobic digestion with a high ratio of bedding. The environmental impact assessment indicates a reduction in global warming potential for anaerobic digestion compared to incineration or composting.

Abstract [sv]

Vid hästhållning alstras hästgödsel som kan användas som växtnäring eller anses vara ett avfall. Hästgödsel utgör både en växtnäringsresurs och en energi resurs. Dessutom styr uppsatta energimål mot att förnybar energi ska ersätta fossila bränslen. Intresset för att öka resursutnyttjandet av hästgödsel ökar på grund av olika incitament för förnybara drivmedel, lagstiftning om gödselhantering och miljöpåverkan från dagens hantering av hästgödsel.

I den här avhandlingen beskrivs hästgödselhantering i ett livscykel­perspektiv genom att (1) identifiera olika faktorer vid hästhållningen som påverkar möjligheten att utvinna biogas ur hästgödsel och återföra näringen till jordbruksmark, (2) analysera faktorer i biogasprocessen som påverkar den specifika metanmängden och innehållet av växtnäring i gödseln och (3) jämföra olika gödselhanteringsmetoders miljöpåverkan. Metoderna i avhan­dlingen har varit litteraturstudier, systematisk kombination av teori och em­piri samt simulering. Resultaten visar att utfodringen, om och hur hästarna hålls inomhus och utomhus och hur hästgödsel lagras påverkar mängden hästgödsel och dess egenskaper, och därmed också hur den fungerar som ett biogassubstrat. Trans­porterna har betydelse för hur mycket gödsel som kan samlas in och spridas, medan gödselspridningen påverkar näringsförluster och närings återföring.

Resultaten från simuleringarna indikerar högst metanutbyte och bäst energi­balans från papper som strömaterial, medan halm och torv gav högre växt­näringsinnehåll i biogödseln. De högsta resultaten på specifik metanmängd nåddes med låg andel strö, vilket också var positivt för växtnäringsinnehållet vid scenarierna med spån och papper. Samtidigt indikerar resultaten att en hög andel strömaterial ger den bästa energibalansen. Miljöpåverkansbedöm­ningen indikerar att potentialen för klimatpåverkan minskar om hästgödsel behandlas i en biogasprocess jämfört med förbränning eller kompostering.

Place, publisher, year, edition, pages
Gävle: Gävle University Press, 2016. 40 p.
Series
Studies in the Research Profile Built Environment. Licentiate thesis, 2
Keyword
Horse manure, horse keeping, anaerobic digestion, nutrient recycling, systems perspective, bedding, methane potential, feedstock, biogas, biofertilizer, Hästgödsel, hästhållning, rötning, näringsåterföring, systemperspektiv, strömaterial, metanpotential, biogassubstrat, biogas, biogödsel
National Category
Bioenergy
Identifiers
urn:nbn:se:hig:diva-22716 (URN)978-91-88145-05-5 (ISBN)978-91-88145-06-2 (ISBN)
Presentation
2016-12-15, Krusenstjernasalen, Kungsbäcksvägen 47, Gävle, 10:30 (English)
Supervisors
Available from: 2016-12-19 Created: 2016-11-09 Last updated: 2017-01-10Bibliographically approved

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