National Transport Library Research Database

Demonstrationsanläggning för förbehandling av restprodukter som halm, växtrester och hästgödsel (Demonstration plant for pretreating residuals such as straw, plants and horse manure)

  • Lunds Energikoncernen AB, Svenskt företag eller organisation, 556100-9852
Sponsors, duration, budget: Energimyndigheten, Lunds Energikoncernen AB ; 2011-05-02 -- 2013-08-31 ; 16300000 kronorRegistration number:
  • Energimyndigheten 2011001653
Subject(s): Abstract: Lunds Energi planerar att bygga en anläggning för ångexplosion i anslutning till sin planerade biogasanläggning i Dalby utanför Lund. Denna ångexplosionsanläggning kommer huvudsakligen förbehandla hästgödsel, fjädrar och fuktig halm som inte duger för förbränning. Kapaciteten beräknas till 6 500 årston substrat.Abstract: In order to create sustainable systems for biogas production in which conflicts concerning the use of valuable agricultural land are avoided, it is needed that we find methods which enable the use of more residues for biogas production. Such a method is steam explosion, a technology which transforms hard processed materials such as straw, feathers and horse manure into a high-quality substrate for biogas production. Horse manure, which instead is spread on fields in Sweden contributes annually to 100 000 tonnes of CO2 equivalent greenhouse gas emissions and about 3300 tons of ammonia which is released into the air. Ammonia creates environmental problems like acidification and eutrophication. With steam explosion could not only more residues be utilized, the technology also allows biogas production from plants grown on marginal land, i.e. land not used for any production today. These plants could be energy grass or hay but also mixtures of seeds which improve the biodiversity, preferably mixtures of seeds containing a high amount of nitrogen-fixing legumes. Steam explosion is a scientifically well studied technique which is tested in several large scale plants abroad. In those large scale plants the technique has only been used for other applications, mainly pretreating sewage sludge but also household waste. There is a lack of knowledge regarding this technology in the use of pretreating residues like horse manure, straw or plant residues and there is no existing example where this technology is used in a profitable way for this application in large scale. This information is needed to be able to make more biogas companies willing to invest in this technology. To overcome this gap in knowledge, Lunds Energi would like to build a demonstration plant for steam explosion in connection to the planned biogas plant in Dalby outside Lund. This steam explosion unit will mainly pretreat horse manure, wet straw (which is unsuitable for burning) and feathers. The capacity is estimated to 6500 tons of substrate annually which will be converted into a high-quality biogas substrate later used in the biogas plant. The goal of this project is to show a method which enables straw and horse manure for biogas production in a sustainable and profitable way by means of constructing a large scale demonstration plant. The goal is also to within the project be able to optimize the technology for the residues of concern in Sweden and to also investigate its potential to pretreat plants grown on marginal lands. If the biogas production in Sweden is going to increase in a sustainable way, a method allowing biogas production from more residues and plants grown on marginal lands is required. It is also required to find a method which increases the profitability of biogas production in general. It seems that pretreatment with steam explosion may be a way to achieve this increase in profitability.
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