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    Wyświetlanie 1-3 z 3
    Tytuł:
    Chlorine and chlorine dioxide oxidation of natural organic matter in water treatment plants
    Autorzy:
    Özdemir, Kadir
    Powiązania:
    https://bibliotekanauki.pl/articles/2032873.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chlorine
    drinking water
    trihalomethane
    chlor
    woda pitna
    trihalometan
    Opis:
    The formation of trihalomethanes (THMs) during chlorine (Cl2) and chlorine dioxide (ClO2) treatment was investigated. Water samples were collected from three drinking water sources, namely, Büyükçekmece Lake water (BLW) in Istanbul City, Kızılcapınar Lake water (KLW), and Ulutan Lake water (ULW) in Zonguldak City, Turkey. The results of the study show that Cl2 treatment forms more THMs in all three water sources compared to ClO2treatment. Further, due to the Cl2treatment, the maximum THMs concentrations were observed in BLW (121.15 μg/dm3) samples, followed by KLW (97.26 μg/dm3) and ULW(88.52 μg/dm3) samples within the reaction time of 24 h for 5 mg/ dm3 of Cl2dose. However, it was found that the concentrations of THMs formed at three water sources with applied ClO2treatment under the same conditions were significantly reduced. As a result of the ClO2treatment at the end of the reaction time of 24h, THMs concentrations formed in BLW, KLW, and ULW were recorded as 30.26, 16.53, and 17.71 μg/ dm3, respectively. On chlorination, chloroform (CFM) was found the dominant THM species in all water sources. All THM species contents ranged from 1.98 μg/dm3 to 11.23 μg/ dm3 and the highest level of dibromochloromethane (BDCFM) was observed as the major THM species among all species in BLW due to the ClO2treatment. Also, the formation of inorganic DBPs such as chlorate (ClO3–) and chlorite ClO2–) was evaluated during Cl2oxidation. The levels ClO2– formed due to the ClO2 oxidation were higher than those of ClO3– levels for BLW, KLW, and ULW samples and varied from 19 to 55%, and from 37 to 60% of the applied ClO2 doses (2–10 mg/ dm3), respectively. On the other hand, ClO3– levels varied between 5 and 9% and 2 and 6% of the applied ClO2concentration for the KLW and ULW samples, respectively.
    Źródło:
    Environment Protection Engineering; 2020, 46, 4; 87-97
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of trihalomethane formation after chlorine dioxide preoxidation followed by chlorination of natural organic matter
    Autorzy:
    Özdemir, Kadir
    Powiązania:
    https://bibliotekanauki.pl/articles/2032930.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ClO2
    THM
    trihalomethane
    drinking water
    trihalometan
    woda pitna
    Opis:
    Chlorine dioxide (ClO2) is widely used as powerful oxidant to remove taste, odor and pathogenic microorganisms with chlorine during water treatment. In this study, the formation of trihalomethanes (THMs) was investigated in sequential ClO2 and chlorination processes. During the study, water samples were collected from Terkos Lake water (TLW) and Büyükçekmece Lake water (BLW) in Istanbul. To understand the relationship between the formation of THMs and the characteristics of natural organic matter (NOM), changes in the molecular weight (MW) of NOM fractions before and after ClO2 oxidation were characterized with the ultrafiltration technique. The NOM fraction with MW <1 kDa is the dominant fraction among all the fractionated water samples. ClO2 oxidized NOM to more hydrophilic and smaller organic fractions as seen in the NOM fraction with MWCO <1 kDa. ClO2 preoxidation reduced THM concentrations but produced chlorite (ClO2 –) and chlorate (ClO3 –). The increase in ClO2 doses enhanced the reduction percentages of THMs during subsequent chlorination in water samples without or with bromide application. Bromine incorporation was higher in ClO2ClO2 preoxidized TLW and BLW samples. As a result, the findings of this study demonstrated that ClO2 preoxidation prior to chlorination is an applicable strategy for control of THMs in water treatment.
    Źródło:
    Environment Protection Engineering; 2021, 47, 2; 125-137
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An evaluation of reverse mentoring: A case study of research assistants and advisors
    Autorzy:
    Özdemir, Samet
    Ardýç, Kadir
    Powiązania:
    https://bibliotekanauki.pl/articles/2143663.pdf
    Data publikacji:
    2022-10-31
    Wydawca:
    Szkoła Główna Handlowa w Warszawie
    Tematy:
    mentoring
    reverse mentoring
    research assistant
    advisor
    academy
    Opis:
    Reverse mentoring, which refers to the relationship between a young employee in the role of the mentor and a more senior and experienced employee in the role of the mentee, is gaining popularity in the business world. This study aims to discuss the relationship between research assistants, who are just starting at the academy and are thought to have traces of reverse mentoring, and advisors with more experience in the academy, in the context of the functions and sub-functions of reverse mentoring. In this exploratory study, in which a qualitative research method was adopted, data was obtained as a result of semi-structured interviews with 17 research assistants working in different faculties and departments at a state university in Turkey. The data obtained after the interviews with the research assistants was analysed using content analysis. The findings of the research suggested that the career, psycho-social, and role model functions of reverse mentoring in the relationship between research assistants and their advisors have sub-functions of knowledge sharing, challenging ideas, networking, friendship, and new perspectives. It was also concluded that other functions were at a limited level or non-existent.
    Źródło:
    e-mentor. Czasopismo naukowe Szkoły Głównej Handlowej w Warszawie; 2022, 96, 4; 38-47
    1731-6758
    1731-7428
    Pojawia się w:
    e-mentor. Czasopismo naukowe Szkoły Głównej Handlowej w Warszawie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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