Temat: Dissolved oxygen - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Thermal and Oxygen Conditions in Carp Ponds During the Summer Period
Autorzy:: Wiśnios, M.
Kanownik, W.
Powiązania:: https://bibliotekanauki.pl/articles/124350.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: fish pond
dissolved oxygen
water temperature
Opis:: The work presents changes of oxygen indices in carp ponds during the summer season. The basis of the research were regular water tests conducted in two ponds: Mydlniki II intended for carp farming in the second year of fish production cycle and Bocian used for carp farming in the third (final) year of breeding. The temperature of pond water in July and August was optimal for development and farming of cyprinid fish and ranged from 16.6 to 30.5 °C. The lowest value of oxygen dissolved in water (6.4 mg·dm sup>-3) was registered in Mydlniki II pond and was higher than the oxygen optimum for carp (5 mg·dm sup>-3). Oxygen saturation in water of fish ponds exceeded the optimum upper limit value (168%) on a few dates, however, it posed no lethal threat for fish. In August in Bocian pond oxygen saturation fell within the range of optimal values, creating better conditions for fish development. In the secondary pond (Mydlniki II) it was found that oxygen saturation in water on 12 dates was lower than the low optimal value (96%).
Źródło:: Journal of Ecological Engineering; 2015, 16, 5; 144-150
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Influence of Sedimentary Fe and Mn on the Oxygenation of Overlying Waters in Dam Reservoirs
Autorzy:: Koszelnik, P.
Bartoszek, L.
Powiązania:: https://bibliotekanauki.pl/articles/123078.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: manganese
iron
dissolved oxygen
dam reservoir
Opis:: This paper reports the work to determine the impact that concentrations of manganese (Mn) and iron (Fe) in the bottom sediments of shallow dam reservoirs exert upon the dissolved oxygen concentrations of overlying waters. Specifically, the work was conducted in the period of 2013–2014 in six shallow artificial reservoirs located in SE Poland. The waters of all the reservoirs studied are relatively well oxygenated, though both supersaturation and anoxic conditions are observed seasonally across the 50–150% range. The reported reactions of bottom sediments were between pH 7.7 and 8.2, while the mean concentrations of Mn and Fe were found to vary widely from site to site (Mn from 0.068 to 1.48 g/kg d.w. and Fe from 2.48 to 24.0 g/kg d.w.). It was not possible to demonstrate any direct relationship between sediment Fe and Mn concentrations, the Mn/Fe ratio or pH on the one hand and the oxygenation of reservoir waters on the other. However, multiple regression analysis did allow for the identification of a significant influence of both Mn content and sediment pH on the oxygen concentration in reservoir waters. In simple terms, both an increase in Mn and a decrease in pH can be said to result in more fully aerobic conditions in waters.
Źródło:: Journal of Ecological Engineering; 2018, 19, 5; 180-185
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Elektrochemiczne oznaczanie tlenu rozpuszczonego w wodzie
Ehlektrometricheskoe opredelenie kisloroda rastvorennogo v vode
Electrometric estimation of oxygen dissolved in water
Autorzy:: Stasiak, M.
Powiązania:: https://bibliotekanauki.pl/articles/874306.pdf
Data publikacji:: 1958
Wydawca:: Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:: tlen
oznaczanie
metoda Winklera
tlen rozpuszczony
stezenie tlenu rozpuszczonego
oxygen
determination
Winkler method
dissolved oxygen
dissolved oxygen concentration
Źródło:: Roczniki Państwowego Zakładu Higieny; 1958, 09, 4
0035-7715
Pojawia się w:: Roczniki Państwowego Zakładu Higieny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Microstructure and Corrosion Behaviour of Co-Mo/TiO2 Nano-Composite Coatings Formed on Disk and Wire Electrodes by Electrodeposition
Autorzy:: Krawiec, H.
Vignal, V.
Latkiewicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/352460.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: cobalt
molybdenum
nanocrystalline coating
corrosion
dissolved oxygen
Opis:: The influence of the electrode geometry on the microstructure and corrosion behaviour of Co-Mo nano-crystalline coatings elaborated by electrodeposition is studied. The corrosion behaviour was determined in the Ringer’s solution at 25°C. Electrodeposition mechanisms are also discussed as a function of the electrode geometry. The electrode geometry was found to affect the growth rate and, under certain conditions, the microstructure (existence of channels and pores). It does not have influence on the corrosion behaviour.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 1; 23-28
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Influence of Dissolved Oxygen on the Corrosion Behaviour in Ringers Solution and Artificial Saliva of Co-Mo Nano-Crystalline Coatings Electrodeposited on Co and 316L Substrates
Autorzy:: Vignal, V.
Krawiec, H.
Latkiewicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/353806.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: cobalt
molybdenum
nanocrystalline coating
corrosion
dissolved oxygen
Opis:: The influence on the corrosion behaviour of Co-Mo nano-crystalline coatings of dissolved oxygen is studied in the Ringer’s solution and artificial saliva at 25°C. This was done by means of potentiodynamic tests and surface observations. It was shown that dissolved oxygen has no influence on passivity, oxidation of the coating and selective dissolution of cobalt. By contrast, dissolved oxygen affects corrosion. General corrosion was observed in the Ringer’s solution whereas pitting corrosion was found in artificial saliva.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 1; 39-43
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Content of dissolved oxygen and carbon dioxide in rainwaters and groundwaters within the forest reserve of the Kampinos National Park and the urban area of Warsaw, Poland
Autorzy:: Pawlicka, D.
Powiązania:: https://bibliotekanauki.pl/articles/2059188.pdf
Data publikacji:: 2003
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: dissolved oxygen
carbon dioxide
zone of aeration
infiltration
groundwater
Opis:: Research were conducted within two experimental fields differing from each other in land use. The source of percolating water and shallow groundwater within both fields is primarily the rainwater which controls their ionic and gaseous content. Considerable air pollution affects the rainwater falling on Warsaw. The chemical composition of the rainwaters should be considered as the first factor responsible for the observed differences in ionic and gaseous composition of percolating water within the two experimental fields. Subsequent chemical changes of these waters during infiltration depend on the character of the geologic profile and the rate of infiltration.
Źródło:: Geological Quarterly; 2003, 47, 2; 187-194
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Storage and its Effect on Chemical Quality Indicators in Sachet Water Brands Sold in Owerri Municipal, Imo State, Nigeria
Autorzy:: Duru, Chidi Edbert
Amadi, Uzoamaka Sandra
Enyoh, Christian Ebere
Powiązania:: https://bibliotekanauki.pl/articles/1113927.pdf
Data publikacji:: 2017
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Dissolved oxygen
Nitrate
Phosphate
Sachet water
Water quality
pH
Opis:: This study investigated the effect of storage on certain sachet water quality indicators over a twelve-week period. Three brands of sachet water were collected within 24 h of production and analyzed for pH, nitrate, phosphate and dissolved oxygen. These were then placed in normal storage. According to out results, pH values increased significantly in all brands after week 8. Moreover, nitrate and dissolved oxygen values decreased throughout the investigation period, while phosphate values increased in all brands tested. All tested brands showed various degree of variation over the period of study. Still, all brands analyzed were within permissible limit by World Health Organization (WHO) stipulations. However, continuous storage can significantly alter the chemical quality indicators to a level that exceeds the limit set by WHO; hence, becoming harmful to human health. Therefore, it is recommended that sachet water should not be stored for more than 12 weeks from the date of production.
Źródło:: World News of Natural Sciences; 2017, 12; 73-81
2543-5426
Pojawia się w:: World News of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Stacking Artificial Intelligence Models for Predicting Water Quality Parameters in Rivers
Autorzy:: Almadani, Mohammad
Kheimi, Marwan
Powiązania:: https://bibliotekanauki.pl/articles/2202356.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: dissolved oxygen
water quality
ensemble-stacking model
meta-learner
Opis:: Scrutinizing the changes in the quality of river water is one of the main factors of monitoring the quality of natural flows, which plays a crucial role in the sustainable management of these ecosystems. The concentration of dissolved oxygen (DO) in river water is one of the most important indicators of quality management in such water bodies. From an environmental point of view, exceeding the permissible and natural decay capacity of pollutants in natural streams leads to a decrease in DO and, consequently, causes serious risks for the survival of aquatic life in related ecosystems. Hence, in the present study, 10 daily variables with the amount of dissolved oxygen on the same day were collected and evaluated from Allen County. Moreover, half of these variables were chosen as effective inputs to the model based on statistical analysis, so as to calculate the dissolved oxygen concentration parameter. Modeling with artificial intelligence approaches was implemented in the form of four individual methods: ANFIS-PSO, OS-ELM, Bagging-RF and Boosting CART, and two ensemble-stacking methods: SMA and Meta-learner MLP. The outcomes of estimating the DO with RMSE, MAE, GRI, r, and MBE criteria and marginal-scatter and subject profile diagrams were discussed. Moreover, the efficiency of the models in estimating the outlier of the observational data was scrutinized by subject profile diagram. Finally, it was found that the Meta-learner MLP model with RMSE of 0.965 mg/L had improvement in performance by 8.8%, 8.9%, 22.3%, 24.9% and 27.6%, respectively, compared to SMA, Boosting CART, Bagging-RF, ANFIS-PSO and OS-ELM methods. This remarkable improvement led to recommendations for using stacking techniques in water quality modeling and simulation.
Źródło:: Journal of Ecological Engineering; 2023, 24, 2; 152--164
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Previous investigations on the influence of oxygen concentration on nitrogen removal efficiency in a hybrid moving bed sequencing batch biofilm reactor (MBSBBR)
Oczyszczanie ścieków w reaktorach ze złożem ruchomym - możliwości technologiczne
Autorzy:: Żubrowska-Sudoł, M.
Podedworka, J.
Powiązania:: https://bibliotekanauki.pl/articles/396466.pdf
Data publikacji:: 2007
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: oczyszczanie ścieków
reaktor sekwencyjny
dissolved oxygen concentration
MBSBBR
nitrogen removal
Opis:: The paper presents preliminary results of the research on the efficiency nitrogen removal in a hybrid sequencing batch reactor MBSBBR operating at low dissolved oxygen (DO) concentration ranging between 0,5 and 2 mg O_2/l. The study was carried out in a pilot scale model of SBR with a total volume of 35 liters, filled with carrier media up to the volumetric ratio 7,5 % of the fill volume. A high efficiency of COD removal, obtained at DO concentration of 0,5--1,0 mg O_2/l, creates possibilities for a substantial reduction of exploatation costs for wastewater treatment plants on MBSBBR reactors. The analysis of the influence of a preset DO level on nitrogen transformation processes was found that together with an increase of DO concentration in the aerobic phases of the cycle an increase of the nitrification rate and decrease of the simultaneous denitrification rate can be observed. The highest efficiency of nitrogen compounds removal was reached at DO concentration of 1,0--1,5 mg O_2/l. The conducted survey has confirmed that a DO concentration is one of the criterion-parameters for the process of simultaneous denitrification in aerobic phases.
W artykule przedstawiono wyniki badań nad wpływem stężenia tlenu na efektywność usuwania azotu w reaktorze sekwencyjnym ze złożem ruchomym (MBSBBR). Eksperyment przeprowadzono w laboratoryjnym modelu reaktora typu SBR o całkowitej objętości 35 litrów dla stężenia tlenu w zakresie 0,5---3,0 mg O_2/l. Wypełnienie stanowiło 7,5% czynnej objętości reaktora. Uzyskana dla stężenia tlenu 0,5--1,0 mg O_2/l wysoka efektywność usuwania związków organicznych (ChZT) wskazuje na możliwość znaczącego obniżenia kosztów eksploatacyjnych małych oczyszczalni ścieków typu MBSBBR. Analiza wpływu stężenia tlenu na procesy przekształcania azotu wykazała, że wraz ze wzrostem poziomu tego wskaźnika rosła wydajność procesu nitryfikacji, ale jednocześnie malała wydajność procesu symultanicznej denitryfikacji w fazach tlenowych cyklu. Najwyższą efektywność eliminacji azotu uzyskano dla stężenia tlenu w zakresie 1,0--1,5 mg O_2/l. Przeprowadzone badania wykazały, że stężenie tlenu jest jednym z kryterialnych parametrów procesu symultanicznej denitryfikacji w fazach tlenowych.
Źródło:: Civil and Environmental Engineering Reports; 2007, 2; 129-143
2080-5187
2450-8594
Pojawia się w:: Civil and Environmental Engineering Reports
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Assessment of the water quality from hand dug wells and boreholes water in Rogo Local Government Kano State, Nigeria
Autorzy:: Getso, Balarabe Usman
Tijjani, Aisha
Ahmad, Mani
Mustapha, Adamu
Powiązania:: https://bibliotekanauki.pl/articles/1177450.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Dissolved Oxygen
total acidity
total hardness
water pollution
water quality
Opis:: Water quality analysis was conducted using physico chemical and biological parameters on water samples collected from boreholes (B1, B2, B3 and B4) and hand dug wells (W1, W2, W3 and W4) eight wards Rogo Town, Kano Sate, Nigeria in order to determine its suitability for drinking in enriched in WHO standards for drinking water. Fourteen (14) water quality parameters, namely pH, temperature, total alkalanity, total acidicity, dissolved oxygen (DO), 5-day biochemical oxygen demand (BOD5), total coliform, odour, taste, color, clarity, total hardness calcium (Ca),and magnesium (Mg). Results obtained showed that the mean pH readings ranges from 6.2 – 6.6 and temperature of the sample ranges from 24° C – 27° C. Total alkalinity ranges from 63-80mg/l, total acidity showed a great variation between the hand dug wells and borehole samples. DO concentrations of hand dug wells were less than that of boreholes and did not meet the WHO unit (5 -14 mg/l). The BOD5 of both boreholes and hand dug wells water sample were within the WHO standard (2 – 4 mg/l) for drinking, except borehole water sample from B4 with BOD value of 1.9. The water samples from both sources were odorless, colorless, tasteless and clear for consumption.
Źródło:: World Scientific News; 2018, 103; 242-249
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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