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    Wyświetlanie 1-3 z 3
    Tytuł:
    Disintegration of biological sludge. A comparison between ozone oxidation and ultrasonic pretreatment
    Autorzy:
    Erden, Gulbin
    Filibeli, Ayse
    Powiązania:
    https://bibliotekanauki.pl/articles/208083.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ultrasounds
    ozone
    oxidation
    anaerobic conditions
    biopreparations
    ultradźwięki
    utlenianie
    ozon
    osady ściekowe
    warunki beztlenowe
    Opis:
    The effects of ozone oxidation and ultrasonic pretreatment on anaerobic sludge bio-processing have been studied. Ultrasound (9690 kJ/kg total solids (TS) of specific energy) and ozone (0.1 g O3/kg TS) were applied to sludge samples preceding anaerobic sludge digestion for disintegration purpose. Organic matter reduction and methane production were measured, as well as physicochemical characteristics (pH, alkalinity, and particles size) and dewatering characteristics of sludge during semi-batch anaerobic digestion. For each treatment, 5 days of sludge retention time were applied on mesophilic conditions for 30 days operation period. The highest volatile solids reduction was obtained with ozone oxidation. Moreover, disintegrated sludge with ozone oxidation and ultrasonic pretreatment provided 55% and 49% higher methane production comparing to the raw sludge, respectively. In terms of dewatering characteristics of digested sludge, ultrasonic treatment led to an increase in the sludge’s resistance to dewatering. This negative effect was not observed in ozone oxidation.
    Źródło:
    Environment Protection Engineering; 2019, 45, 3; 55-67
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Xylose substrate as the only nutrient in the operation of microbial fuel cells
    Autorzy:
    Vajda, B.
    Nemestothy, N.
    Bakonyi, P.
    Bélafi-Bakó, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/208205.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    microbial fuel cells
    catalysis
    anaerobic conditions
    anaerobic sludge
    catalytic reaction
    Shewanella
    mikrobiologiczne ogniwa paliwowe
    kataliza
    warunki beztlenowe
    reakcje katalityczne
    Opis:
    Microbial fuel cells are bioelectrochemical devices converting chemical energy of organic compounds (i.e. biomass) into electrical energy by catalytic reactions of microbes under anaerobic conditions. The operation of two-chamber microbial fuel cells by Shewanella putrefaciens and mesophilic anaerobic sludge was studied comparatively, using xylose and glucose as solo substrates during the experiments. It was found that higher electric power was generated by the multicultural system than by the monoculture.
    Źródło:
    Environment Protection Engineering; 2014, 40, 2; 131-141
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enrichment of PAO and DPAO responsible for phosphorus removal at low temperature
    Autorzy:
    Haiming, Z.
    Xiwu, L.
    Abualhail, S.
    Jing, S.
    Qian, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/207785.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    wastewater treatment
    phosphorus removal
    bacteria
    batch reactors
    aerobic condition
    polyphosphate accumulating organisms
    PAO
    denitrifying polyphosphate accumulating organisms
    DPAO
    oczyszczanie ścieków
    usuwanie fosforu
    bakteria
    reaktory wsadowe
    warunki beztlenowe
    analiza mikrobiologiczna
    biologiczne usuwanie fosforu
    organizmy akumulujące polifosforany
    Opis:
    A new strategy of enrichment of polyphosphate accumulating organisms (PAO) and denitrifying polyphosphate accumulating organisms (DPAO) at low temperature ranging from 8 °C to 11 °C was demonstrated through two lab-scale reactors operated in sequential anaerobic-aerobic (AO) or anaerobic-anoxic (AA) conditions. It was found that the AO reactor is able to achieve a good phosphorus removal performance after 40 days of operation, while a similar stable phosphorus removal can be obtained in the AA reactor after 80 days. This result suggests that the enrichment of PAO was easier than that of DP AO at low temperature. Through switching batch tests, when DPAO is exposed to aerobic conditions, it can immediately exhibit a good phosphorus removal similar to that under anoxic conditions, while PAO can only present poor phosphorus removal when exposed to anoxic conditions, suggesting that two different types of Accumulibacter were enriched both in AA and AO reactors. Microbial analysis with fluorescence in situ hybridization (FISH) and DAPI (4',6-diamidino-2 -phenylindole) staining revealed that Accumulibacter was dominant both in the two reactors, accounting for 61.6% and 79.3% of all bacteria in AA and AO reactors, respectively. Although the different amount of Accumulibacter was enriched in the two reactors, the similar microbial morphologies were observed by using scanning electron micrograph (SEM), both presenting long-rod morphology. This kind of Accumulibacter may display affinities for sodium acetate used as the carbon sources here. This strategy proposed in this study was shown to be effective in achieving a very high enrichment of Accumulibacter at low temperature by linking chemical analysis with microbial observation.
    Źródło:
    Environment Protection Engineering; 2014, 40, 1; 67-83
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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