Produktions- och optimeringspotentialen vid anaerob rötning av flytgödsel från nötkreatur granskades. Detta genom att, i laboratoriemiljö, undersöka förändringar i processtabilitet, gasproduktion och metanhalt vid tillsats av kycklinggödsel och pH-buffert med flytgödsel från nötkreatur som grundsubstrat. Tillsatsen av pH-buffert underlättade tillväxtfasen för mikroorganismerna, snabbare ökning i metanhalt och den totala metangasproduktionen ökade. Skillnaden var som störst under tillväxtfasen och avtog från stationärfas och framåt. Tillsats av kycklinggödsel har i detta fall inhiberat processen, möjligtvis på grund av ammoniakinhibering vid tillsats av det kväverika substratet som kycklinggödsel är..

The goal of the society to increase the proportion of renewable energy has led to an increased demand of bioenergy e.g. forest biomass. However, there are concerns that removal of biomass will lead to decreased base cation concentrations in the soils and acidification of streams. In order to find in which types of landscape removal of branches and tops could have such negative effects, this study aims to analyse the relations between pH-sensitivity and landscape variables in the Bothnia Bay water district. GIS and digital geographical data were used to analyse the landscape in subcatchments.

De tidigare studierna som undersökt miljökuznetskurvan (EKC) för koldioxid-utsläpp, där de flesta urval baserats på OECD medlemsländer, har fått varierande resultat. Den här studien använder sig av både OECD medlemsländer och länder som inte är medlemmar i OECD. Urvalets data baseras på åren 1971-2010 för totalt 57 länder från runt om i världen. Resultaten visar tecken på ett inverterat U-format förhållande mellan koldioxidutsläpp och inkomstnivå, men att ett monotont stigande förhållande inte kan avfärdas. Enligt de uppskattade ekvationerna är inkomstnivån där utsläppen tenderar att minska lägre för hela urvalet än för både OECD-medlemsländerna och länderna som inte är medlemmar i OECD.

The aim of this study is to increase knowledge and understanding regarding which institutional demands can be identified by social welfare secretary?s in their work with juvenile offenders. The study uses organizational theory to try and find different institutional strategies that social workers use to handle such demands. The study takes a qualitative approach and consists of six semi-structural interviews with social welfare secretary?s who work with juvenile offenders.The results of the study show how institutional influence comes from various organizations and institutions such as media, legislation as well as the police and justice system.

The acid deposition of sulphur- and nitrogenoxides from combustion of coal and oil cause acidification that lowers pH and gives increased contents of metals and altered aquatic biodiversity in the stream. The liming of lakes and streams, which was introduced to resist the acidification, demand large economic resourses despite of the decreased deposition of the acidifyng substances. Some of the streams are influenced by the acid deposition, while others are naturally acidic. It is therefore importaint to separate the anthropogenically acidified waters from the naturally acidic, in order to optimize the use of governmental fundings for liming. This thesis aims to estimate the acidity status and impact of acidification on 24 catchments upstream liming dispensers, which is part of the liming activities at the County of Dalarna.The acidity status of the streams was classified according to the Swedish Environmental Protection Agency old classification system (Naturvårdsverket 1999) as very acid to acid, with small ability to withstand a pH-change (alkalinity) due to acid deposition.

Horses are by nature herbivores, specialized on grass, and graze during the main part of the day. The horse has neither changed this basic behaviour nor the function of gastro-intestinal tract, when the horse was domesticated by man. A horse on pasture has an even production of saliva and gastric acids. The Buffering effect of the saliva makes the pH in the stomach above four throughout most of the day. With abnormal long breaks of eating, the pH may decrease, causing an increased risk of gastric ulcer.

GE Healthcare operates in Uppsala (Sweden) and develops systems, equipments and medium to purify medical substances. Discussions with the local authority concerning planed far-reaching changes and upgrades of the biological process techniques for sewage management, aroused the question about revising the terms of permit for the activity. Therefore it seemed necessary to evaluate a newly installed biological process technique, which is the background of this thesis. The evaluated biological treatment process was built in 2003 and consists of a biological reactor filled with moving bed carriers with a high surface area for biological growth. At the time of the project the biological wastewater treatment plant consisted of a flow equalization facility and two following parallel biological processes; a biological reactor with moving bed carriers and a tower trickling filter.The aim of this thesis was to survey the function of the biological reactor with respect to the reduction of organic matter.