Search for dissertations about: "Mesophilic"

Showing result 1 - 5 of 32 swedish dissertations containing the word Mesophilic.

  2. 1. Biological Pretreatment and Dry Digestion Processes for Biogas Production

    Author : Regina Patinvoh; Thierry Ribeiro; Högskolan i Borås; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Solid wastes; Dry anaerobic digestion; Textile bioreactor; Plug flow bioreactor; Digestate; Process stability; Pretreatment; Co-digestion; Mesophilic; Resource Recovery; Resursåtervinning;

    Abstract : Biogas technology has been used quite extensively to generate renewable energy from organic wastes while also recycling nutrients in the wastes and reducing harmful emissions. However, the challenges of low biogas yield from recalcitrant and inhibitory solid wastes together with high construction and operation costs of bioreactors have impeded optimal performance through this process. READ MORE

  4. 2. Enhanced biogas production from municipal WWTPs : Co-digestion of microalgae with sewage sludge and thermophilic secondary digestion of mesophilic digested sludge

    Author : Jesper Olsson; Eva Thorin; Emma Nehrenheim; Raúl Muñoz Torre; Mälardalens högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energy- and Environmental Engineering; energi- och miljöteknik;

    Abstract : Biogas is produced when organic material is broken down in oxygen-free (anaerobic) conditions. This process is called anaerobic digestion and is used in most large and medium-sized municipal wastewater treatment plants in Sweden. READ MORE

  5. 3. Biogas production through the syntrophic acetate-oxidising pathway : characterisation and detection of syntrophic acetate-oxidising bacteria

    Author : Maria Westerholm; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Biogas produced from wastes, residues and energy crops has promising potential to reduce greenhouse gas emissions and to secure future energy supply. Methane is the energy-rich component of biogas, and is formed as the end product during degradation of organic material without oxygen (anaerobic). READ MORE

  6. 4. Structure determination, thermal stability and catalytic mechanism of hyperthermostable isocitrate dehydrogenases

    Author : Mikael Karlström; Karolinska Institutet; Karolinska Institutet; []
    Keywords : X-ray crystallography; isocitrate dehydrogenase; thermostability; catalytic mechanism;

    Abstract : In this thesis, studies on the enzyme isocitrate dehydrogenase (IDH) from the hyperthermophiles Aeropyrum pernix (ApIDH), Thermotoga maritima (TmIDH), Archaeoglobus fulgidus (AfIDH) and Pyrococcus furiosus (PfIDH) are presented. The aim of the described work was to contribute to the understanding of protein thermostability and to study the catalytic mechanism. READ MORE

  7. 5. Increase of Biogas Production at Wastewater Treatment Plants Addition of urban organic waste and pre-treatment of sludge

    Author : Åsa Davidsson; Avdelningen för kemiteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; kontroll av utsläpp; pollution control; Miljöteknik; Environmental technology; Miljöstudier; Environmental studies; biogas; anaerobic digestion; sludge; Wastewater; organic waste; methane;

    Abstract : Anaerobic digestion of organic matter results in the production of biogas, which can be used to replace fossil fuels. There is potential for increased biogas production at wastewater treatment plants by digesting urban organic waste either separately or together with the sludge. Biogas production could also be increased by sludge pre-treatment. READ MORE