Avloppsreningsverket Sundet i Växjö har en rötningsanläggning som producerar Biogas. Anläggningen består idag av två rötkammare och en maskin för avvattning som substratet går igenom efter rötningen. Substratet som används i rötningsprocessen är avloppsslam från Växjö. Planer finns på att utöka processen med en tredje reaktor i vilken det rötade slammet ska återrötas. Detta för att få ut mer Biogas ur slammet.

The purpose of this thesis was to make an energy survey and quantify energy flows of individual unit operations associated with the Biogas production in Uppsala Vatten och Avfall AB:s Biogas plant, located at Kungsängens gård. Moreover, large consumers of energy would be identified and analyzed. The objective of this energy survey was to obtain a detailed understanding of the energy use in the Biogas production.The energy survey was divided into two parts: electricity and heat. Each part was treated separately and with somewhat different approach. To estimate the electricity usage during the projcet the rated power of each selected unit operation was noted and multplied with thenmeasured time of usage.

The purpose of this thesis was to make an energy survey and quantify energy flows of individual unit operations associated with the Biogas production in Uppsala Vatten och Avfall AB:s Biogas plant, located at Kungsängens gård. Moreover, large consumers of energy would be identified and analyzed. The objective of this energy survey was to obtain a detailed understanding of the energy use in the Biogas production. The energy survey was divided into two parts: electricity and heat. Each part was treated separately and with somewhat different approach. To estimate the electricity usage during the projcet the rated power of each selected unit operation was noted and multplied with the measured time of usage.

BackgroundThis paper is based on an issue raised by the organization Energigas Sverige, which together with the Ministry of Finance has posed the question about the fiscal impact of an increase in Biogas production. Since the fiscal effects of an increased Biogas production are both positive and negative, due to reduced use of fossil fuels, we want to investigate this further.PurposeThe purpose is to describe and explain the obtained fiscal impacts of an increased Biogas production and based on our problem: ?What are the obtained fiscal effects caused by an increase in Biogas production?? we could see the following fiscal effects: positive impact on employment, increased revenues of social security contributions and income taxes, reduced unemployment costs and reduced tax revenues on fossil fuels. These effects are summarized in a negative tax revenue of 2,6 billion SEK. Along the summarized negative effect we also accepted one of the two prepared hypotheses, which stated that an increase in Biogas production leads to a negative fiscal impact. Design/Methodology/ApproachWe have chosen to work from an Anglo-Saxon scientific tradition and furthermore, we have a positivistic approach when we want to explain the relationship between cause and effect of an increase in Biogas production and the following fiscal impacts.

The community Vessigebro, in Falkenberg and its surrounding areas housing one percent of all dairy cattle and two percent of all pigs in Sweden. This means that there is a large amount of manure as a basis for producing Biogas in the area. A number of farmers have therefore formed a cooperative named Vessigebro Biogas and started the project Green Vessigebro, with the goal of creating the conditions for a more profitable and more sustainable agriculture production.The study deals with the conditions and sale opportunities of the feasibility study Green Vessigebro. The study has looked at the work that was previously carried out for the Biogas that could be produced on the farms in Vessigebro, The main pipeline for natural gas on the Swedish west coast and its operators, the Swedish Competition Act , Electricity Act , Natural Gas Act, the District Heating Act , Sustainability Act , previously proposed measures, municipality interest in Biogas from Vessigebro , possible collaborations, possible sale opportunities and perform calculations with data from the municipality Ljungby for a suggested transportation of Biogas between Vessigebro and Ljungby.The study shows that there are several interesting sale opportunities for Biogas from Vessigebro. The production and use of Biogas in Sweden is increasing and the trend seems set to continue.

The demand for Biogas as vehicle fuel has risen sharply and there is a great need for increased production. A possible addition of vehicle gas can be produced by upgrading landfill gas which is formed by degradation of organic waste. This thesis investigates the potential of producing vehicle fuel from landfill gas in the region of Biogas Öst.In 2008, an amount of 32 million Nm3 landfill gas was extracted in the region. This level can be maintained for another ten years if the efficiency of gas extraction is improved. The annual production will decrease with time since landfills aren?t allowed to receive more organic waste.

Biogas a?r en fo?rnybar energika?lla som kan framsta?llas genom ro?tning av organiskt material som go?dsel eller gro?dor. Trots att lantbruket sta?r fo?r 76 % av den totala Biogaspotentialen i Sverige producerades endast en procent av Biogasen 2008 i ga?rdsanla?ggningar. Uppsatsens syfte a?r att ge en o?versikt o?ver vad som orsakar den la?ngsamma utvecklingen av sma?skalig Biogas, samt att ge fo?rslag till lo?sningar som kan leda till en snabbare expansion.

The development of farm-operated Biogas plants in Sweden is increasing. This study investigates the process that firms go through in developing such ventures. The aim is to identify obstacles and opportunities that individual farmers have encountered during the implementation process, and through a comparative analysis find similarities and differences between cases. The overall goal is to increase understanding of the factors that influence farmers? development of farm-based Biogas production, and more specifically, explore opportunities for support organizations to contribute to the innovation process. Findings indicate that the implementation process has changed over time.

Sedan 1996 står Biogas för över hälften av den använda fordonsgasen i Sverige. Det blir således allt mer angeläget att framställa Biogas. Biogasprojektet Biogas i Brålanda har för avsikt att framställa Biogas genom rötning av naturgödsel/stallgödsel och, eller slakterirester.Materia från en eller flera rötas för att producerar Biogas och efter rötningen återstår ett högkvalitativt gödselmedel, biogödsel. Biogödseln skall användas som gödsel på de till projektet anslutna åkrarna. Uppsatsens huvudfråga är huruvida biogödseln från projektet Biogas i Brålanda får användas som gödsel på de till projektet anslutna åkrarna.

It is essential to reuse- and recycles residues to decrease the amount of deposit materials and reach sustainable energy use. Two ways to work towards this is to recycle wood ashes to the forest as nutrient compensation and extract Biogas from combustion of biomass.The aim with this study was to decide whether wood ashes that been used for Biogas upgrading with accelerated carbonation also can be used as a nutrient compensation in the woods according to recommendations from the Swedish Forest Agency (Skogsstyrelsen).The ashes that were used in this study came from Johan Andersson who works at JTI in Uppsala, who also treated the ashes with Biogas. The ashes have, in both untreated and treated condition, been analyzed in this study according to contents of elements, leaching properties, hardening properties and contents of crystalline phases, to evaluate what impact carbonation with Biogas has on the ashes.The accelerated carbonation led to hardening of the ash, and decreased amount of CaO- and increased amount of CaCO3. The CO2-uptake also entails a dilution of the elements, and the content of nutrients and trace elements decreases. However the results show an indication of an uptake of S from the Biogas to the ash, since the dilution had a smaller impact on S than the rest of the elements.

As a small and land scarce country, effective waste management is ofoutmost importance in Singapore. In this study the production of Biogasthrough anaerobic digestion from the organic fraction of municipal solidwaste (OFMSW) was compared to incineration of the waste. At the momentalmost all of the OFMSW in Singapore is incinerated. Three differentscenarios were compared to the reference scenario (incineration): one with alarge scale Biogas plant that can treat half of all OFMSW in Singapore, onewith a medium scale Biogas plant about 15 times smaller than the large oneand one with a small scale Biogas plant that can treat waste from e.g. ashopping center or a food center.By using life cycle assessment (LCA) the different scenarios were comparedin terms of global warming potential (GWP), acidification, eutrophication,energy use and land use.

Svensk Växtkraft is the owner of the Biogas plant in Västerås. The company is planning to increase their treatment capacity at their Biogas plant. In connection to this work it is also possible to make some energy saving changes to the Biogas plant. The objective of this study was therefore to make an electricity and heat survey of the Biogas plant, a detailed study of the heat consumption in the sanitation step and also a comparison of energy consumption with the present sanitation method and an alternative strategy where the waste is treated in 55 °C during 10 hours (the current method is heating to 70 °C during 1 hour). The energy survey was conducted in close collaboration with staff at the Biogas plant. The current during normal operation was measured, power was calculated and multiplied by the time of usage to obtain the energy consumed.

Biogas mainly consists of methane and carbon dioxide, where methane is theenergy-rich gas, and is naturally created when organic matter breaks down in absenceof oxygen, also known as anaerobic digestion. A Biogas plant re-creates the anaerobicconditions inside a digester where the organic substrate is fed into and digests toproduce Biogas. The gas is then used to produce energy by combustion and can beseen as a completely renewable fuel.Today, energy from Biogas is used primarily by major stakeholders such asmunicipalities and thus the plants become very large with high investment- andconstruction costs. There are currently few small plants in Sweden, even though thepotential for agriculture and medium-sized to smaller farms to become self-sufficientin terms of electricity and heat is great. Farms have a natural stock of digestibleorganic material in form of manure or crops for example, which are constantlyavailable.

Sweden has a natural gas grid extending along the west coast, from Trelleborg to Stenungsund. There are also several smaller local networks where a planned natural gas pipeline from Skutskär to Hofors prompted the need for a comprehensive study. This study examines the linkages that exist in terms of technology and market of natural gas and Biogas in Sweden. Sweden has set high targets for the future with ambition to become independent of coal and oil as energy sources. Since 1985, a part of the solution has been import of Danish natural gas.

A Biogas plant in SLU?s (Swedish University of Agricultural Sciences) management sustains to behave in con-nection with the new animal stables at Lövsta. There will primarily manure from stables that rot to Biogas. The Biogas plant will also have the capacity that rot others substrates that can arise in the farm operation. The aim with the Biogas plant is to produce non fossil electrical and gas heat for own customs, to reduce smell impact from stables and to make possible different types of research investments within the area.This study has implemented multiple cases study of different investment scenarios.