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    Wyświetlanie 1-4 z 4
    Tytuł:
    Trihalomethane Formation Potential in the Water Treated by Coagulation
    Autorzy:
    Dąbrowska, Lidia
    Powiązania:
    https://bibliotekanauki.pl/articles/124324.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    coagulation process
    organic matter
    trihalomethanes
    water
    Opis:
    The aim of the research was to evaluate the effectiveness of the coagulation process using pre-hydrolysed salts, polyaluminium chlorides, in reduction of water pollution with organic substances, including precursors to formation of trihalomethanes (THMs) during water chlorination. Surface water collected from the Stradomka river and from the Adriatyk reservoir located in Częstochowa was used for the research. In addition to typical indices used to assess the content of organic compounds (total and dissolved organic carbon TOC and DOC, oxygen consumption, ultraviolet absorbance UV254), the study also evaluated the potential of THM formation. Under the laboratory conditions of the process using pre-hydrolysed coagulants, reductions in oxygen consumption and TOC contents depending on the month and place when water was collected were 17–42% and 14–38%, respectively, whereas reduction in UV254 absorbance ranged from 39 to 69%. The study confirmed the usefulness of the coagulation process in the removal of organic matter, which represents a precursor for formation of trihalomethanes. The potential for THM formation in treated water was by 28–55% lower than in untreated surface water after chlorination. The concentration of trichloromethane was 78–93% of the total THM content in the chlorinated treated waters. Dissolved organic matter played a major role in CHCl3 formation (76–88%).
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 9; 237-244
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Ozonation, Coagulation and Adsorption on Natural Organic Matter Removal
    Autorzy:
    Dąbrowska, Lidia
    Powiązania:
    https://bibliotekanauki.pl/articles/1955547.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    ozone
    activated carbon
    polyaluminium chloride
    trihalomethane precursor
    Opis:
    For the treatment of surface water, the coagulation process was used with highly alkaline polyaluminium chloride PAX-XL19F and coagulation supported by ozonation and adsorption on powdered activated carbon CWZ-30 for reducing the level of surface water pollution with organic substances. In addition to the typical indices used to assess the content of organic compounds (total organic carbon TOC, oxidisability OXI, ultraviolet absorbance UV254), the study also evaluated colour, turbidity, and the potential of trihalomethanes formation THM-PF. Reduction in the content of TOC in water after coagulation ranged from 22 to 24%, OXI in the range of 34-36%, and UV254 absorbance from 52-55%. The turbidity and colour of the water was reduced by 70-73% and 56-60%, respectively. The use of preliminary ozonation and activated carbon-assisted coagulation increased the efficiency of water treatment. Changes in the values of TOC, OXI, UV254 absorbance, turbidity and colour were 28-33%, 45-46%, 69-73%, 72-79% and 89-100%, respectively. In the water purified by coagulation and then chlorinated, THM-PF was 37-38% lower than in untreated surface water. The use of additional pre-ozonation and activated carbon during coagulation increased the reduction of THM-PF by 9-12%.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 9; 216-223
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena wód i osadów dennych zbiorników rekreacyjnych na terenie miasta Częstochowa
    Assessment of waters and bottom sediments of recreational reservoirs in the city of Czestochowa
    Autorzy:
    Dąbrowska, Lidia
    Sperczyńska, Elżbieta
    Piekutin, Janina
    Powiązania:
    https://bibliotekanauki.pl/chapters/27322309.pdf
    Data publikacji:
    2023-07-19
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    metale ciężkie
    zbiorniki rekreacyjne
    woda
    osady denne
    heavy metals
    recreation reservoirs
    water
    bottom sediments
    Opis:
    Oceniono jakość wody i osadów dennych w kąpielisku Bałtyk-Adriatyk i zbiorniku Pacyfik, znajdujących się na terenie miasta Częstochowa, pod względem wybranych parametrów fizyczno-chemicznych. Stwierdzono na podstawie porównania z wymaganiami dla kategorii jakości wód powierzchniowych A1-A3, że wody w zbiornikach, poza zawartością OWO i stężeniem kadmu, spełniały wymagania dla najwyższej klasy A1 (w przypadku OWO dla klasy A2). Wody charakteryzowały się niskim stężeniem azotu (< 0,75 mg N/dm3) i jonów metali ciężkich: cynku, miedzi, niklu, ołowiu i kadmu (< 0,03 mg/dm3). Całkowitą zawartość metali ciężkich w osadach dennych analizowano według kryteriów geochemicznych. Stwierdzono, że osady w punktach poboru próbek były niezanieczyszczone cynkiem, miedzią, ołowiem, a miernie zanieczyszczone kadmem i niklem.
    The chapter assesses the quality of water and bottom sediments in the Baltic-Adriatic bathing area and the Pacific reservoir are located in the city of Czestochowa, in terms of selected physicochemical parameters. It was found on the basis of a comparison with the requirements for the A1-A3 water quality category that the water in the reservoirs, except for the TOC content and cadmium concentration, met the requirements for the highest class A1 (in the case of OWO for class A2). The waters were characterized by a low concentration of nitrogen (< 0.75 mg N/dm3) and heavy metal ions: zinc, copper, nickel, lead and cadmium (< 0.03 mg/dm3). The total content of heavy metals in the bottom sediments was analyzed according to geochemical criteria. It was found that the sediments at the sampling points were not contaminated with zinc, copper, lead, and were moderately contaminated with cadmium and nickel.
    Źródło:
    Inżynieria środowiska i biotechnologia. Wyzwania i nowe technologie; 22-34
    9788371939013
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in the mitochondrial network during ectromelia virus infection of permissive L929 cells
    Autorzy:
    Gregorczyk, Karolina
    Szulc-Dąbrowska, Lidia
    Wyżewski, Zbigniew
    Struzik, Justyna
    Niemiałtowski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/1039359.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    mitochondrial network
    ECTV-MOS
    apoptosis
    Opis:
    Mitochondria are extremely important organelles in the life of a cell. Recent studies indicate that mitochondria also play a fundamental role in the cellular innate immune mechanisms against viral infections. Moreover, mitochondria are able to alter their shape continuously through fusion and fission. These tightly regulated processes are activated or inhibited under physiological or pathological (e.g. viral infection) conditions to help restore homeostasis. However, many types of viruses, such as orthopoxviruses, have developed various strategies to evade the mitochondrial-mediated antiviral innate immune responses. Moreover, orthopoxviruses exploit the mitochondria for their survival. Such viral activity has been reported during vaccinia virus (VACV) infection. Our study shows that the Moscow strain of ectromelia virus (ECTV-MOS), an orthopoxvirus, alters the mitochondrial network in permissive L929 cells. Upon infection, the branching structure of the mitochondrial network collapses and becomes disorganized followed by destruction of mitochondrial tubules during the late stage of infection. Small, discrete mitochondria co-localize with progeny virions, close to the cell membrane. Furthermore, clustering of mitochondria is observed around viral factories, particularly between the nucleus and viroplasm. Our findings suggest that ECTV-MOS modulates mitochondrial cellular distribution during later stages of the replication cycle, probably enabling viral replication and/or assembly as well as transport of progeny virions inside the cell. However, this requires further investigation.
    Źródło:
    Acta Biochimica Polonica; 2014, 61, 1; 171-177
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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