Biogas is a renewable energy produced through anaerobic digestion, which means that organic matter is degraded by microorganisms under anaerobic conditions. The produced biogas can then be used for cogeneration, electricity, heat or upgraded to vehicle gas. Eskilstuna Energy & Environment AB has four digesters at Ekeby water sewage treatment plant, Eskilstuna. One of the biogas reactor (RK4) is equipped with a jet-mixing system while the remaining digester uses top-mixing. The mixing system is an important parameter to achieve optimum operating conditions for the process regarding gas production and degree of digestion.

Next year, Swedish upper secondary school will be the arena for a new comprehensive reform according to an extensive government bill. The reform will probably have major impact on every-day educational practices. The aim of this paper is to describe the consequences forbiology teaching when the reform is implemented, and to analyse in what way the biology teachers, and other participants, take part in digitised discussion forums during the implementation of the reform.The research design consists of a quantitative approach and two different methods are used, i.e. descriptive content analysis and quantitative content analysis. The content and meaning of the government bill is analysed and the statements from the participants at the discussion forums are equally important in order to fulfil the aim of this inquiry.The results show the reform will have a profound impact on the subject biology, e.g.

The last major change occurred in 2005 when the new sexual offenses law came into force with an increased focus on children. The purpose of this study is that through a content analysis to identify and understand the construction of children in the new legislation on sexual offenses on the basis of preliminary work. Based on the purpose we came up with two questions: How are children constructed in the preparatory works to the new sexual offenses law? Are they attributed to child characteristics and responsibilities in the new legislation on sexual offenses and if so, how? In order to achieve the purpose of the study we have chosen the preparatory works to the new legislation on sexual offenses from 2005 until today. The study's empirical work has been further narrowed to the children, which means that a distinction is made in the new legislation on sexual offenses to 6 chapter 4-6 §§.

In this thesis, the flows of reactive nitrogen (Nr) in Scania were investigated and quantified. The thesis was also intended to form a basis for comparison between the urban nitrogen flow and other flows of nitrogen within Scania. The management of nitrogen in society has disturbed the natural nitrogen cycle. This is linked to a series of environmental problems such as eutrophication, acidification, global warming and smog. The method used was Substance Flow Analysis (SFA) for Nr. For calculation and flow charts Scania was divided into three subsystems; air, water and society.

The access to good sanitary facilities is an important factor that elevates the experienced living standard as it improves hygiene and reduces the transmission of deseases. The ratification of the millennium goals by 189 countries demonstrates that this is an important international issue. Together the countries have taken upon themselves that the proportion of the population that lacked access to sustainable safe drinking water and sanitary facilities in the year 2000 will have been reduced by half by the year 2015. In Peru, the construction of sewage pipe networks to transport the sewage out of the direct human environment is progressing. The safety and sustainability of these systems can be questioned, since in Peru the sewage seldom receive any treatment before being emitted to a recipient. This is taking place in Picota and sorrunding villages as well. In the last 25 years several systems implementing small-scale onsite treatment have been introduced throughout Latin America in an attempt to give more people access to sustainable and safe sanitary facilities, reducing water consumption and taking advantage of the agricultural values of the sewage fractions while protecting the environment from its negative impact. In this study three different sanitary systems and the effects of different population growths were compared.

Reducing the CO2-pollution, resulting from the combustion of fossil coal for energyproduction, is important to affect environmental changes. One way to achieve a reductionis to use the oxy-fuel technology. The technology uses O2 and re-circulated flue gasduring the combustion which results in a flue gas mainly consisting of CO2. The flue gascould then be compressed and stored without environmental effects. A problem thatfollows from the compression is the risk of acidification in sensitive parts of the process.Acidification can occur because of reactions following from the contact of condensedwater and sulphur- and nitrogen-oxides which are also present in the flue gas.This report compiles and evaluates the basis of a scientific unit with the purpose ofexploring the possibilities of extracting impurities of SOx and NOx from the flue gases.The dimensions of the unit are based on basic conditions, defined for an existing oxy-fuelprocess at Chalmers, and on the results of computer modelling.

The water tower in Uppsala city forest was built in the late 1950's in what is now a nature reserve. The unique place was supposed to be visited by people, which is currently not the situation. This bachelor thesis aimed to perform an analysis and make a design proposal for the environment surrounding the water tower. The analysis was performed using the methodology previously described by architect Arne Branzell. The methodology focuses on how a space is perceived by a person moving through it.

SharePoint är ett stort content- och managament-system som många företag använder sig av. I detta kan mallar specificeras för olika dokumenttyper (kallade content types), som underlättar skapandet av nya dokument för slutanvändaren. Systemet för mallarna blir dock snabbt omständligt och ohanterligt när antalet mallar företaget använder sig av växer.I detta examensarbete undersöks en lösning till problemet med mallarna, som finns tillgänglig på Microsofts Codeplex-site, där projekt under open-source licens kan laddas upp för allmänheten. Under arbetet undersöktes denna lösning djupare och vidareutvecklades för att i slutet av arbetet kunna levereras i form av en prototyp som HOW Solutions kunde använda sig av i framtida projekt.Slutresultatet blev en prototyp som bygger vidare på den tidigare lösningen och som tillåter användaren att specificera en mall-hubb, i form av en site-samling med bibliotek som kan förse andra bibliotek med mallar. Under projektet blev också en annan vidareutveckling av programmet funnen, som visar stor potential och som bör tittas närmare på..

The Earths climate is changing at a higher rate, i.e between 1861 and 1994 the annual mean temperature in Scandinavia increased with 0,68º C and according to recent climate models the annual mean temperature is likely to rise with another 3º C during this century.A warmer climate in many ways is associated with changing conditions for lake ecosystems. An expected higher water temperature and a stronger summer stratification of the water column increases the risk of anoxic conditions at the lake bottom. Thus anoxic conditions are likely to cause a phosphate leakage from the sediment, i.e. a higher internal loading of phosphate.In this project, the extremely warm summer of 2002 has been used as an example for a possible scenario for a future climate. By comparing levels of phosphorus in the summer of 2002 with a ten-year median value, a phosphorus related sensitivity to climate change has been analyzed for 55 Swedish lakes.

Starting point to this Paper is the idea and wish to adapt the society and its different activities to a recycle society. A building area in Göteborg is planned and investigated for such adaptation. In the district named Skogaberg, about 130 households totally are planned from what 20 are blocks of flats. The idea with this project is to constitute an alternative sewage system, a Blackwater system, were the fractions of most nutrients and least pollution are separated, taken care of and utilised. The aim is to get a market and use the nutrients of the organic waste from the household in agriculture use.

This thesis compares different methods for risk assessment of a creosote contaminated site in Vansbro, Dalarna. In a complementary study the importance of using representative data for calibration and validation of stationary groundwater models is discussed. The time dependency between surface water levels and groundwater levels on the site in Vansbro is evaluated by step response analysis. The results show that the groundwater levels reflect only long-term variation in the surface water levels. Hence the use of such long-term means for calibration and validation of the stationary groundwater models is the only theoretically defendable alternative.As a first step in the comparison of risk assessment methods the degree of contamination is evaluated on the basis of generic guideline values for contaminated soils, developed by the Swedish Environmental Protection Agency.

Microwave is a time- efficient device for heating and reheating of foods. Despite the fact that its effects on foods have been evaluated during a long period of time, without any more negative effects shown compared to conventional cooking, one third of the Swedish population believes (in 2010) it accounts for a higher loss of nutrition. This literature review aim to compile studies regarding how food is affected by cooking in microwave, with respect to cooking losses, nutrition, secondary metabolites as well as sensory and textural aspects and compare it with conventional cooking. The compilation shows that different combination of effect (W), time and amount of water during microwave cooking have different effects on foods. The contents of proteins, vitamin B and carbohydrates are generally higher after microwave cooking, while anti-nutritional substances are affected much less during conventional cooking. This also depends on if it is of animal or non-animal origin. However, for the majority of nutrition values the differences are quite small.

Microwave is a time- efficient device for heating and reheating of foods. Despite the fact that its effects on foods have been evaluated during a long period of time, without any more negative effects shown compared to conventional cooking, one third of the Swedish population believes (in 2010) it accounts for a higher loss of nutrition. This literature review aim to compile studies regarding how food is affected by cooking in microwave, with respect to cooking losses, nutrition, secondary metabolites as well as sensory and textural aspects and compare it with conventional cooking. The compilation shows that different combination of effect (W), time and amount of water during microwave cooking have different effects on foods. The contents of proteins, vitamin B and carbohydrates are generally higher after microwave cooking, while anti-nutritional substances are affected much less during conventional cooking. This also depends on if it is of animal or non-animal origin. However, for the majority of nutrition values the differences are quite small.

This Master Thesis aims to study and discuss the occurence of three concepts in some influential cultural policy documents which includes the UNESCO public library manifesto, the Swedish libraries act, the Swedish cultural policy objectives, and a study from the mid nineties which deals with the cultural policy. The questions asked are: -Do the documents mention democracy? In what way? -Do the documents mention the public sphere? In what way? -Do the documents mention information? In what way? -How can we understand the content of the documents through relevant theories about democracy, the public sphere and information? Theories about the information society are used, as well as theories from Jürgen Habermas, Herbert Schiller and Robert Dahl. The way of method is document studies and abduktion, with influences from hermeneutic theory. The analysis deals with the documents through these concepts: democracy, the public sphere and information and puts forward the content, or lack of content, about democracy in the analysed material.

Beans are a global source of plant-based protein, and in some countries, they constitute a primary source of protein intake. With ongoing climate change, including rising temperatures, it is necessary to adapt beans to ensure a reliable food supply. An important mechanism that many plants have, to cope with high temperatures, is cooling through transpiration. During transpiration, stomata open and release water vapor. Water molecules use heat energy from the leaf to convert into gas, thereby cooling the leaf.