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    Tytuł:
    Frakcje ChZT ścieków w mechaniczno-biologicznej oczyszczalni
    COD Fractions in mechanical-biological wastewater treatment plant
    Autorzy:
    Sadecka, Z.
    Płuciennik-Koropczuk, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819509.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    oczyszczalnie ścieków
    oczyszczalnie mechaniczne
    oczyszczalnie biologiczne
    frakcje ChZT
    sewage treatment plants
    mechanical treatment
    biological wastewater
    COD fractions
    Opis:
    W pracy przeprowadzono ocenę skuteczności rozkładu zanieczyszczeń organicznych w ściekach po poszczególnych procesach mechaniczno-biologicznego oczyszczania ze szczególnym uwzględnieniem zmian frakcji ChZT w ciągu technologicznym oczyszczalni w Zielonej Górze.
    In Polish literature there is little information regarding the distribution of COD fractions, therefore, identify the theoretical topic has been mainly based on foreign literature. Literature data 'tips a COD divided into factions as the most suitable for accurate characterization of organic matter in municipal wastewater. In Poland, continues for many years, to identify the organic matter in wastewater contractual indicators such as BOD5, CODCr, CODMn, organic carbon content and loss during roasting were used. Information on the composition of the effluent, obtained based on these conventional indicators, are much less accurate when compared with data obtained on the basis of COD fractions. In the majority of cases the values of concentration of biodegradable organic matter in wastewater is expressed in BOD5, whereas identification of COD fractions, additionally allows the evaluation of the amount of impurities which are non biodegradable and which decrease the efficiency of biological treatment. The paper presents results of studies concerning the designation of COD fraction in the raw wastewater and their alternations after subsequent processes in mechanical-biological wastewater treatment. The test object was a wastewater treatment plant for the city of Zielona Góra. Sampling of raw wastewater and wastewater after various stages of mechanical-biological treatment, and laboratory tests such as designating pollution indicators such as: CODMn, CODCr, BOD5, BODtot and TOC was performed according to Polish standards. During investigation following fractions of COD were also determined: dissolved non bioderadable SI, dissolved easily biodegradable SS, in organic suspension slowly degradable XS and in organic suspension non-biodegradable XI. Methodology for determining the COD fraction was based on the guidelines ATV A 131. Analysis of results of research concerning changes in fractions of COD in the wastewater treatment plant showed that: 1. More than 75% of the total COD in the raw wastewater inflowing to the wastewater treatment plant "Łącza" were biodegradable fractions: bound in suspension XS and dissolved SS, 2. Technological system of the mechanical-biological wastewater treatment plant in Zielona Góra does not change the solute concentration in the effluent of non-biodegradable dissolved fraction SI, 3. Changes in the percentage contribution of fraction XS, XI, and the SS were a consequence of biochemical changes occurring in the biological part of the plant, 4. CODCr indicator values in all analyzed wastewater samples were lower than the total COD, which is the sum of individual fractions of COD, 5. Differences between the effectiveness of work in the wastewater treatment plant in Zielona Góra based on CODCr and total COD were the order of 1%, 6. The values of the percentage contribution of XS, XI, SI, and SS fraction in the total COD of raw wastewater from Zielona Góra are consistent with the values given in the literature.
    Źródło:
    Rocznik Ochrona Środowiska; 2011, Tom 13; 1157-1172
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ diazynonu (Basudin 25EC) na proces fermentacji metanowej komunalnych osadów ściekowych
    Impact of Diazinon (Basudin 25EC) on the Anaerobic Digestion Process of Municipal Sewage Sludge
    Autorzy:
    Sadecka, Z.
    Myszograj, S.
    Sieciechowicz, A.
    Płuciennik-Koropczuk, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818611.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    insektycydy
    toksyczność
    fermentacja metanowa
    biogaz
    insecticides
    toxicity
    anaerobic digestion process
    biogas
    Opis:
    The process of methane fermentation is a labile process, sensitive to changes in the environment and susceptible to various substances which may turn out to be toxic for anaerobic biocenosis. The process may be inhibited by both the substances supplied together with the substrate and also the products resulting from the decomposition phases. The group of toxic substances which influences the fermentation process comprises heavy metals, organic compounds, ammonia nitrogen, lower organic acids, nitrogen or sulphur compounds, add to this a large group of organic micropollutants such as hormones added to fodder, disinfectants, insecticides, chemotherapeutics, antibiotics or chemical plant protection products which are all overlooked. These compounds, while occurring in the media subjected to anaerobic stabilisation, may cause a decrease in the speed of the process, possibly also causing its disruption. The inhibitory effect of various chemical compounds on the course of the fermentation process may be evaluated on the basis of the characteristics of the microorganism community, dynamics of changes in its structure and activity of the population. The determination of the activity of enzymes participating in the methane fermentation may be used to evaluate the impact of xenobiotics on the fermentation process and the efficiency of methane production. In the operational practice referring to the fermentation equipment, the impact of biotic and abiotic factors may be evaluated on the basis of changes in the process parameters. The changes in the quantity of microorganisms and the low enzymatic activity cause a decrease in the efficiency of biogas production including methane, as well as a reduction in the effectiveness of the process measured by the loss of the content of organic compounds. The paper presents the results of laboratory tests, concerning the effect of diazinon on the course of biogas production in the process of the methane fermentation of municipal sewage sludge. Diazinon is one of the representatives of phosphate insecticides and an active substance of the commercial preparation bearing the name Basudin 25EC. The effect of the preparation on the course of the process of methane fermentation of sewage sludge was studied within a dose range from 0.5 to 30 mg/ dm-3. The characteristic indicators of the course of anaerobic stabilisation of sewage sludge include the quantity and the composition of the fermentation gas in reference to the fermentation temperature and time. Based on the changes of these parameters, the inhibitive effect of diazinon contained in the Basudin 25EC technical preparation was evaluated. The biogas production in sludge with various doses of diazinon was assumed as a measure of toxicity in reference to the control sludge. The results of the studies showed that: Anaerobic microorganisms are characterised by sensitivity to the Basudin 25EC utility preparation (with a content of 25% diazinon). The first symptoms of the inhibition of the fermentation process occurred at doses of the preparation amounting to 0.5, 1 and 2 mg/dm-3. The inhibition is confirmed by a decrease in the biogas production of about 10%. The intensification of inhibition symptoms was evident at doses ranging from 4 to 8 mg/ dm-3. The reduction in biogas production ranged from 13,0–25,0%. In the sludge where the greatest dose of the preparation was applied, that is, 30 mg/ dm-3, the biogas efficiency went down from 522 dm-3/kg of dry matter to 57.0 dm-3/kg of dry matter. A 10 mg/ dm-3 dose of Basudin 25EC, causing a 60% decrease in the efficiency of biogas production (from 522 to 211 dm-3/kg of dry matter) must be regarded as toxic for the process of methane fermentation of municipal sludge sewage.
    Źródło:
    Rocznik Ochrona Środowiska; 2015, Tom 17, cz. 2; 931-942
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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