Sökning: "Aeration"

Visar resultat 1 - 5 av 93 uppsatser innehållade ordet Aeration.

  1. 1. Numerical Study on Air Demand of Free Surface Flows in a Discharge Tunnel

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för fysik och astronomi; Uppsala universitet/Institutionen för fysik och astronomi

    Författare :Jonathan Barassa; Rickard Nordlöf; [2020]
    Nyckelord :Computational Fluid mechanics; Hydropower; Air demand; Free surface flows; ANSYS Fluent;

    Sammanfattning : Aeration issued through a ventilation shaft is an important measure to prevent cavitation and large gauge pressure in flood discharge tunnels. In order to dimension the ventilation shaft appropriately, itis necessary to have a good understanding of the air-water flow in the tunnel. LÄS MER

  2. 2. En Moving Bed Biofilm Reactor som försteg till en Långtidsluftad Aktivslam : Syresättningsförmågan och syrebehovets påverkan på energibehovet.

    Kandidat-uppsats, Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

    Författare :Diana Klarström; [2020]
    Nyckelord :Biologisk rening; MBBR; LAS;

    Sammanfattning : The pulp and paper mill requires a lot of water during the production. Stora Enso Skoghall requires about 33m3 of water for 2204 lb produced carbon or paper. Before the wastewater returns to the recipient, the water must be purified from organic material. LÄS MER

  3. 3. Aeration and risk mitigation for flood discharge tunnel in Zipingpu water conservancy project

    Master-uppsats, KTH/Betongbyggnad; KTH/Betongbyggnad

    Författare :Jorge CONTRERAS MORENO; KIBRET DAWIT GHEBREIGZIABHER; [2020]
    Nyckelord :Flood discharge tunnel; cavitation risk; cavitation index; aerators; CFD model;

    Sammanfattning : The importance of hydraulic structures has become an essential mitigating mean for floodsthat occur more often due to climate change. Thus, the importance and safety of flooddischarge tunnels has promoted further studies and experiments on the topic to mitigatedamages, such as cavitation that arise because of high speed flows. LÄS MER

  4. 4. Partial denitrification as nitrite provider for mainstream anammox

    Master-uppsats, Lunds universitet/Kemiteknik (CI)

    Författare :Felix Wallin Holmin; [2020]
    Nyckelord :Water engineering; Environmental engineering; Mainstream anammox; Partial denitrification; PDA; MBBR; Nitrogen removal; Vattenförsörjningsteknik; Avloppsteknik; Technology and Engineering;

    Sammanfattning : In traditional wastewater treatment, nitrogen is removed through the biological process combination of nitrification and denitrification. Although it is a well-established method, the need for aeration and possible addition of an external carbon source results in it being an energy-negative and costly process, thus making alternative methods for nitrogen removal compelling to examine. LÄS MER

  5. 5. Olika filtermaterial vid jordbruksdränering

    Uppsats för yrkesexamina på avancerad nivå, SLU/Dept. of Soil and Environment

    Författare :Hanna Falk; [2019]
    Nyckelord :dräneringsfilter; mineralfilter; organiska filter; syntetiska filter;

    Sammanfattning : Drainage of arable land creates a better soil structure and a better aeration of the soil profile. Some fields are naturally drained, while others are dependent on drainage to create good cultivation conditions. Subsurface drainage is the most common method used to artificially drain arable land. LÄS MER