Search for dissertations about: "Hans-Bertil Wittgren"
Found 5 swedish dissertations containing the words Hans-Bertil Wittgren.
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1. Removal of wastewater nitrogen in a wetland filter
Abstract : An artificial wetland system, designed to achieve year-round wastewater treatment concomitantly with nutrient recycling, was studied for three years. As part of a joint research project, this thesis focuses on nitrogen transformations and nitrogen removal capacity. READ MORE
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2. Diffuse emissions from goods : influences on some societal end products
Abstract : End products of society (e.g. sewage sludge and incineration ashes) can be used as indicators of the use of chemicals in consumer goods. Through upstream work the sources of substances released from goods may be identified before the emissions reach the end products. READ MORE
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3. Performance Assessment of Wastewater Treatment Plants : Multi-Objective Analysis Using Plant-Wide Models
Abstract : As the knowledge about anthropogenic impacts of climate change has grown, the awareness of the contributions from treatment of wastewater has widened the scope for wastewater treatment plants (WWTPs). Not only shall ever stricter effluent constraints be met, but also energy efficiency be increased, greenhouse gases mitigated and resources recovered. READ MORE
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4. Reducing household waste : A social practice perspective on Swedish household waste prevention
Abstract : This thesis studies household waste prevention from a social scienceperspective. Swedish waste management is efficient in handling wastebut has not succeeded in reducing its quantities, even though theissue of waste prevention is being raised at both international andnational levels. READ MORE
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5. Towards the Control of Microplastic Pollution in Urban Waters
Abstract : Water pollution has long been considered a challenge in urban areas, and new types of pollution are continuously introduced to society. Urban wastewater and stormwater act as transport pathways of pollution from urban areas to receiving waterways. READ MORE