In order to avoid harmful substances ending up at the municipal sewage treatment plants, it is important to purify the wastewater at the source. One such source is the wheel washers available in many tire garages which are used to wash the wheels on our vehicles when we change between summer and winter tires. It is important to wash the wheels before storage, to extend the tires lifetime. The purpose of this study is to find a green innovative solution for reduction of emissions of heavy metals at the source, so that the sludge from the sewage treatment plants can be used as fertilizer. The target is to find a wheel wash method which leads to compliance with the guidelines for car washers, and that also provides a better washing result than with the existing method.

Stockholmsoperan, Stadsgårdkajen, en opera för alla!Koppla samman och tillåta; Mitt huvudkoncept handlar om att skapa kopplingar i staden och locka människor att vistas på platsen, dag som natt, Stockholmsbo som värmlandsbo. Oavsett om du går på opera eller bara tar en kvällspromenad, vill äta en god matbit eller fika på café, ska operan tillgodose alla dessa behov..

This study was made as a part of a feasibility study on a polishing wetland at Rimbo wastewater plant (wwp) in Norrtälje municipality. The wwp had to decrease the nitrogen discharge to reach the limit 15 mg tot-N/l. The nitrogen in the outlet was mainly in the form of nitrate, hence the wetland mainly ought to support denitrification. The proposed area for the wetland was situated right next to the wwp and was already in the municipalitys posession. One aim of this study was to examine what spieces of plants needed to achieve highest possible denitrification.

Because of the increasing trends in energy consumption and increased environmental awareness, greater focus has been placed on improvement and development of renewable energy sources. An already proven and accepted method is biogas production from anaerobic digestion at municipal wastewater treatment plants.In the waste water treatment process solid material and dissolved pollutants are separated from the water, forming a sludge. The sludge is separated from the process and stabilized during anaerobic digestion or aerobic aeration. Most often, mesophilic anaerobic digestion is used. Because of degradation by microorganisms, biogas with a high content of methane is formed during the digestion.

This thesis is based on a case study of the City of Stockholm. The study aims to explore the effects on the city's large investments caused by the public reform. Furthermore, the question concerns the character of the impact and if it will affect what type of investments that will be prioritized. The theoretical background is based on Brunsson's ideas about political organizations shifting towards corporate nature, and Almqvist's interpretation of New Public Management (NPM). Moreover, models explaining public management reform, and the main components of corporate shifting, are used.

The aim with this master's thesis is to describe the work process with the graduation film Player, by a composers perspective and given conditions. It provides a detailed insight into how the work was done from the script stage to the end result, scene by scene reflecting about both the musical performance and the collaboration between the director and me as a composer. The work was done during the spring term of 2012 at the Royal College of Music in Stockholm and Stockholm Academy of Dramatic Arts..

Grunden för examensarbetet är den tävling om nytt stadsbibliotek i Stockholm som Stockholms stad utlyste 2006. Det nuvarande stadsbiblioteket från 1928, ritat av Erik Gunnar Asplund, är en av Sveriges mest kända byggnader. Uppgiften har varit att rita en tillbyggnad som kan bilda en helhet tillsammans med det nuvarande biblioteket. Det har handlat om att först värdera det som finns idag och sedan tillföra något för framtiden..

Wastewater handling of private sewage systems has become an all increasing matter. In Stockholm region the 90 000 private sewage systems contribute with larger phosphorus flows to the Baltic Sea than the two biggest sewage plants in the area, Henriksdal and Käppala, contribute together, even though these two plants purify wastewater from more than one million inhabitants. When summer house areas turn into areas for permanent living ? transition areas ? the load on the existing systems increases, systems that already often are unsatisfying. In those areas it is not clear what the best system choice is; On-site systems for single households; Local collective systems or Connection to central systems.

Climate changing is a growing problem for many countries and communities over the world. The cities has a huge work to deal with in their reforcements of their cities to be resilient ones. This thesis makes an effort to investigate and illuminate some of the problem the cities has to solve related to flooding, hazards, erosions, rising sea levels and crotches. This thesis will help to find solutions that international and national efforts has produced and handed out to each other. A lot of communities are charing their excellent tools that works for them.

Arlanda airport is Sweden?s largest airport. The demand for comfort cooling of the airport?s buildings is high and is mainly provided by district cooling. District cooling is based on the same principle as district heating.

The Swedish system of rent control has recieved a lot of critique for creating an ill-functioning housing market. Supporters however claim that a movement towards market rents would lead to increased segregation. We evaluate whether rent control has managed to counteract segregation in Stockholm. Our evaluation is based on a data set of 292 representative households in Stockholm. We find that residents in rent controlled apartments in attractive locations typically are born in Sweden by Swedish parents and that they are likely to have a higher income than residents in rent controlled apartments in less attractive locations.

Arvika Fjärrvärme AB, a district heating company from Arvika, today cover 74 % of their total energy production with biofuel wich runs a 16 MW bioler giving process water at saturated liquid state.In recent years Vaporel AB has introduced a new tecnique that gives an external generation of steam after boilers. The concept is built on an adiabatic pressure drop of the saturated liquid in a so called Flashbox which makes a small part of the liquid to evaporate. The generated steam is lead into a turbine where electricity is in a conventional manner.The purpose with this rapport was to do a basic study for the specific system at Arvika where it?s possible to see the potential production of electricity that follows an installation of a flasbox.The final goal was to introduce an economic analysis of a flashox installation at given conditions.To reach our goals we have created a model in Excel where we used the given conditions at Arvika Fjärrvärme to do our calculations. The model has been tested at three different states, of process water returning to potboiler, to be able to decide the optimal operation for the system at present.The studies have resulted in a pressure of the processwater at 14,5 bar (at) and a pressuredrop to 9,5 bar (at) in the flashbox.

Pharmaceuticals that are found in marine ecosystems are a threatening environmental concern, which is known to harm both animal and plant life. One of the reasons for this problem is that the waste water treatment techniques are not optimized to clear waste water from its pharmaceuticals contain. In this master thesis four Swedish treatment wetlands were studied, and their ability to reduce numerous pharmaceuticals in waste water. The four treatment wetlands that were studied were those in Oxelösund, Trosa, Nynäshamn and Eskilstuna. Two ecotoxicological tests and chemical analysis were used.

This master thesis is a study of the Swedish Lending Centre for immigrant literature (ILC), which opened in 1991. The purpose of the thesis is to examine problems and possibilities in the organization of ILC, which has a number of powerful stakeholders. In this study focus has been on the development of the organization, and especially on the planning of the conversion of the non-public Lending Centre to a library open to public (to be called the International Library in Stockholm) that will be inaugurated in May 2000. ILC is governmentally financed, but incorporated in the organization of the public library in Stockholm. Other stakeholders, except the Swedish Government and Stockholm City, are the County of Stockholm, the staff of ILC, and the public libraries that use the Centre's long-distance-lending facilities.

In times of increased flooding, enhanced by climate change, polluted stormwater poses an increased threat to the environment through contaminated water entering waterways. Bioretention utilizes natural processes in soil and vegetation to treat pollutants and combat this threat. Biochar produced through pyrolysis, has a high cation exchange capacity (CEC) and could therefore increase treatment in bioretention systems. This research applies a literature review, interview, and a model to explore the benefits and disadvantages of biochar in order to specify a soil-mix through an understanding of the production process and preferred application rate. High purification through CEC, increased water holding capacity, and carbon sequestration being the benefits discussed.