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    Wyświetlanie 1-4 z 4
    Tytuł:
    Measurement of air-water oxygen transfer of cylindrical vortex flow regulators at a recirculating system
    Autorzy:
    Wójtowicz, P.
    Szlachta, M.
    Kotowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/208207.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hydrodynamics
    storms
    vortex flow
    aeration efficiencies
    hydrodynamic flows
    oxygen mass transfer
    oxygen transfer rate
    recirculating system
    stormwater systems
    sewerage
    oxygen
    hydrodynamika
    burze
    wiry
    efektywność napowietrzania
    przepływy hydrodynamiczne
    przenoszenia masy tlenu
    szybkość transferu tlenu
    system recyrkulacji
    systemy deszczowe
    kanalizacja
    napowietrzanie
    Opis:
    Hydrodynamic flow regulators are used for diversion and/or limiting excess discharge in wastewater and stormwater systems as a replacement for traditional flow throttling devices. They are highly efficient, reliable and free from common disadvantages of traditional devices. Recent research of the authors indicated that atomization of a liquid by vortex flow regulators accelerates oxygenation and prevents the putrefaction process in wastewater and storm water collection systems. The study presents experimental results of the oxygen transfer measurements for basic designs of cylindrical hydrodynamic flow regulators in a closed-circuit experimental setup at the semi-commercial scale. The oxygen mass transfer coefficient, standard oxygen transfer rate and standard aeration efficiency were determined for the range of tested configurations by the clean water test.
    Źródło:
    Environment Protection Engineering; 2013, 39, 3; 207-215
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal and bifurcation characteristics of heat-recirculating conversion of gaseous fuels
    Autorzy:
    Budzianowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/240892.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    konwersja paliw gazowych
    system recyrkulacji ciepła
    termiczna integracja
    conversion of gaseous fuels
    heat-recirculating system
    thermal integration
    Opis:
    The paper investigates the possibility of utilization of heat-recirculating systems for fuel conversions having low net thermal effect. The experimental part is conducted with an electrically heated heat exchanger. It is shown that heat-recirculating systems can operate under superadiabatic conditions. Their thermal characteristics are provided by means of the dependencies of heat recirculation ratio on process parameters. Further, the heat-recirculating catalytic combustion system is characterised via combustion bifurcation diagrams. The similarities and differences of both those heat-recirculating systems are qualitatively compared and explained. Bifurcation characteristics proves to be useful tools in concise description of practical complex heat-recirculating fuel conversion systems in energy generation.
    Źródło:
    Archives of Thermodynamics; 2010, 31, 2; 63-75
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of difference filter media on Recirculating Aquaculture System (RAS) on tilapia (Oreochromis niloticus) production performance
    Autorzy:
    Tanjung, Ricky Rahmat Maliki
    Zidni, Irfan
    Iskandar, Iskandar
    Junianto, Junianto
    Powiązania:
    https://bibliotekanauki.pl/articles/1075772.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Oreochromis niloticus
    filter media
    production
    recirculating aquaculture system
    tilapia
    Opis:
    This research aims to determine the composition of the best filter media on tilapia (Oreochromis niloticus) production performance. The method used in this research is experimental methods use Completely Randomized Design (CRD), which consist of four variables and three replications. The variable used is (A) without media filter (Control); (B) combination of cotton, bio ball and charcoal; (C) combination of cotton bioring and charcoal; (D) combination of cotton, Japanese matt and charcoal. The test fish used 180 tilapia fish with 7-9 cm length size. Tanks that used measured 60 cm x 30 cm x 36 cm as many as 12 pieces. The density during the research was 15 tails per tank. Duration of maintenance is 40 days. The feeding level is given by 5% of fish body weight. Water quality parameters (temperature, dissolved oxygen, pH, ammonia, and nitrate) were observed every 10 days for 40 days. Other parameters are survival rate, absolute length and weight growth, specific growth rate and feed convertion ratio observed every 7 days for 40 days. The results showed that the best composition of filter media for tilapia production performance was combination of cotton, bioball, and charcoal. Tilapia production performance obtained a combination of cotton filter media, bioball, and charcoal with 100% survival rate, length growth 2.17 cm, weight growth of 9.91 g, and specific growth rate of 2.3% and feed conversion ratio of 1.88.
    Źródło:
    World Scientific News; 2019, 118; 194-208
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The challenges of aquaculture in protecting the aquatic ecosystems in the context of climate changes
    Autorzy:
    Wróbel, Jacek
    Gałczyńska, Małgorzata
    Tański, Adam
    Korzelecka-Orkisz, Agata
    Formicki, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/27312664.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    aquaponics
    freshwater ecosystem
    seawater ecosystem
    greenhouse gases
    integrated multi-trophic aquaculture
    mariculture
    pond
    recirculating aquaculture system
    water temperature
    Opis:
    The paper discusses the current prognoses of aquaculture development worldwide putting an emphasis on its effect on the environment and the issue of the protection of water reservoirs in different countries. Water consumption in diversified aquaculture systems is presented herein as well as the characteristics of the mechanical and biological water treatment methods in fish farms, with particular attention paid to the recirculating water systems. New aquaculture technologies using post-production waters are presented. The paper provides a discussion on the contribution of aquaculture to the global greenhouse gas emissions and the means of limiting this emission. The effect of climate change on aquatic ecosystems is presented in the context of the changes of the aquaculture production profile. The paper includes a brief presentation of the methods of mitigating the changes with respect to contamination of aquatic ecosystems as well as climate change. Reducing the water footprint can be achieved through selective breeding, species diversification and implementation of more technologically advanced aquaculture systems such as: integrated multi-trophic aquaculture, aquaponics and recirculation systems in aquaculture. The need for certification of fish farms with water recirculation systems is justified in the paper. The issues addressed herein are summarised and the main areas for extending the research promoting preservation of aquatic ecosystems in aquaculture are presented.
    Źródło:
    Journal of Water and Land Development; 2023, 57; 231--241
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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