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    Wyświetlanie 1-3 z 3
    Tytuł:
    Low bod determination methods: the state-of-the-art
    Autorzy:
    Górski, Ł.
    Trzebuniak, K.F.
    Malinowska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/185812.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biochemical oxygen demand
    biosensor
    wastewater
    microbial sensor
    biochemiczne zapotrzebowanie na tlen
    ścieki
    czujnik drobnoustrojów
    Opis:
    Biochemical Oxygen Demand (BOD) is an important factor used to measure water pollution. This article reviews recent developments of microbial biosensors with respect to their applications for low BOD estimation. Four main methods to measure BOD using a biosensor are described: microbial fuel cells, optical methods, oxygen electrode based methods and mediator-based methods. Each of them is based on different principles, thus a different approach is required to improve the limit of detection. A proper choice of microorganisms used in the biosensor construction and/or sample pre-treatment processes is also essential to improve the BOD lower detection limit.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 4; 629-637
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Treatment processes based on the molecular weight distribution of textile dyeing wastewater
    Autorzy:
    Yaman, F. B.
    Çakmakci, M.
    Karadag, D.
    Özkaya, B.
    Bali, V.
    Dora, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/206910.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biochemical oxygen demand
    bleaching
    cleaning
    dissolved oxygen
    microfiltration
    biochemiczne zapotrzebowanie na tlen
    bielenie
    czyszczenie
    rozpuszczony tlen
    mikrofiltracja
    Opis:
    Rinsing wastewater from dyeing and bleaching processes in a cotton dyeing facility has been separately characterized to evaluate the suitable treatment processes and reuse options. Alternative treatment processes were proposed based on molecular weight distribution (MWD), ultraviolet absorbance of 254 nm (UV254) and specific ultraviolet absorbance (SUVA). Rinsing wastewater samples were sequentially filtrated to determine the MWD of 5-day biochemical oxygen demand (BOD5), chemical oxygen demand (COD), dissolved organic carbon (DOC), total Keldahl nitrogen (TKN) and ammonium (NH4+). Bleaching rinsing wastewater had higher organic and nitrogen contents than dyeing rinsing wastewater and concentrations of pollutants decreased after each membrane filtration step. During the sequential filtration, BOD5/COD ratio in bleaching rinsing wastewater slightly decreased while it significantly increased in dyeing rinsing wastewater. SUVA values indicated that organic matters in the rinsing wastewaters have hydrophilic characteristics in all conditions. The evaluation of all experimental data indicates that combination of anaerobic treatment and NF membrane filtration could provide high quality water for reuse within the facility and discharge into receiving environments.
    Źródło:
    Environment Protection Engineering; 2018, 44, 2; 147-158
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessing the impact of the turbulence of river flow on variations in the concentrations of nutrients
    Autorzy:
    Bagdziunaite-Litvinaitiene, L.
    Litvinaitis, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/207625.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    rzeka
    Morze Bałtyckie
    składniki pokarmowe
    biochemiczne zapotrzebowanie na tlen
    przepływ wody
    jakość wody
    zasoby wodne
    biochemical oxygen demand
    flow of water
    water quality
    water resources
    Baltic Sea
    river
    Opis:
    The fourth-order stream of the Baltic Sea has been analysed, which is a tributary which remained in the riverbed as a result of natural river stretches not corresponding to the status of good water quality. The authors examined separate river stretches representing maximum changes in the hydraulic gradient and investigated the dependence of variations in the concentrations of biogenic nutrients on river flow velocity, i.e., turbulence, defining it by the Reynolds criterion. The calculation of the coefficient of self-purification provides that the river flowing downstream is 100% self-purified and removes all nitrates and 61% of phosphates. The content of dissolved oxygen at the confluence of the river in spring was by 5.5% larger than that at the headwaters, whereas in the summer season, the difference in the content of dissolved oxygen in river water between the headwaters and confluence increased and made 25%. The conducted research has disclosed that the dynamics of river flow affects water quality, and therefore, for selecting monitoring places, land use structure or economic entities situated around the sampling point as well as the nature of the river flow itself must be considered.
    Źródło:
    Environment Protection Engineering; 2017, 43, 3; 81-91
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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