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    Wyświetlanie 1-5 z 5
    Tytuł:
    Colloids in Septic Tank Effluent and Their Influence on Filter Permeability
    Autorzy:
    Spychała, M.
    Nieć, J.
    Walczak, N.
    Marciniak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/952414.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    colloids
    clogging
    hydraulic conductivity
    nonwoven textile
    turbidity
    Opis:
    The aim of the study was to evaluate the content of colloids in septic tank effluent and their impact on textile filter permeability. Measurements were performed on septic tank effluent without suspended solids but containing colloids and without colloids – including only dissolved substances (filtered by micro-filters and centrifuged). The study was conducted on unclogged and clogged textile filter coupons. During the study the following measurements were conducted: turbidity, chemical oxygen demand and hydraulic conductivity of textile filter coupons. The colloid size range was assumed to be less than 1.2 microns according to the literature. Despite the relatively low content in the septic tank effluent the colloids played an important role in the clogging process. Both the filtering media, filled with low (unclogged) and high content of biomass (clogged) were sensitive to the clogging process acceleration due to the possibility of small diameter pore closure and oxygen access termination. Moreover, small size pores were probably sensitive to closing or bridging by small size colloidal particles.
    Źródło:
    Journal of Ecological Engineering; 2015, 16, 4; 74-80
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability of colloidal systems - a review of the stability measurements methods
    Autorzy:
    Matusiak, Jakub
    Grządka, Elżbieta
    Powiązania:
    https://bibliotekanauki.pl/articles/763954.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    stability
    colloids
    zeta potential
    turbidimetry
    spectroscopy
    Opis:
    The stability of colloidal systems is very important in numerous already existing and new formulations. In most cases if such systems are not characterized by an appropriate stability they can not find any useful applications. The opposite process to the stabilization is the flocculation. Generally, it is undesirable. However, in a few cases the flocculation is very useful, for example in  the wastewater treatment. That is why the methods used to determine stabilizing-flocculating properties of the colloidal systems are of significant importance.The paper describes types of stability and flocculation as well as the factors influencing those processes, e.g. the addition of polymers or surfactants. The methods presented in this paper are UV-VIS spectrophotometry,  turbidimetry, zeta potential and density measurements.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2017, 72, 1
    2083-358X
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Agglomeration of silicon dioxide nanoscale colloids in chemical mechanical polishing wastewater: influence of pH and coagulant concentration
    Autorzy:
    Noor Aina, Mahomad Zuki
    Sin, Jing Yao
    Jada, Amane
    Dashti, Fereidonian
    Fatehah, Mohd Omar
    Powiązania:
    https://bibliotekanauki.pl/articles/396244.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    CMP wastewater
    chemical wastewater
    colloids
    pH
    ścieki CMP
    ścieki chemiczne
    koloidy
    Opis:
    Chemical mechanical polishing (CMP) wastewater generated from semiconductor manufacturing industries is known to contain residual organic and inorganic contaminants, i.e. photoresists, acids, including silicon dioxide (SiO2), nanoparticles (NPs) and others. Nanoscale colloids in CMP wastewater have strong inclination to remain in the suspension, leading to high turbidity and chemical oxygen demand (COD). Although various types of pre-treatment have been implemented, these nanoparticles remain diffused in small clusters that pass through the treatment system. Therefore, it is crucial to select suitable pH and coagulant type in the coagulation treatment process. In this research zeta potential and dynamic light scattering measurements are applied as preliminary step aimed at determining optimum pH and coagulant dosage range based on the observation of inter particle-particle behavior in a CMP suspension. The first phase of the conducted study is to analyze nanoscale colloids in the CMP suspension in terms of zeta potential and z-average particle size as a function of pH within a range of 2 to 12. Two types of coagulants were investigated - polyaluminum chloride (PACl) and ferrous sulfate heptahydrate (FeSO4x7H2O). Similar pH analysis was conducted for the coagulants with the same pH range separately. The second phase of the study involved evaluating the interaction between nanoscale colloids and coagulants in the suspension. The dynamics of zeta potential and corresponding particle size were observed as a function of coagulant concentration. Results indicated that CMP wastewater is negatively charged, with average zeta potential of -59.8 mV and 149 d.nm at pH value of 8.7. The interaction between CMP wastewater and PACl showed that positively charged PACl rapidly adsorbed colloids in the wastewater, reducing the negative surface charge of nanoscale clusters. The interaction between CMP wastewater and FeSO4x7H2O showed that larger dosage is required to aggregate nanoscale clusters, due to its low positive value to counter negative charges of CMP wastewater.
    Źródło:
    Civil and Environmental Engineering Reports; 2019, 29, 3; 252-271
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Spectroscopy: Some Applications on Structural Changes and Relaxation Dynamics in Soft Matter
    Spektroskopia mechaniczna: niektóre zastosowania do zmian strukturalnych i dynamiki relaksacji w materii miękkiej
    Autorzy:
    Wu, Q.
    Liu, Ch.
    Powiązania:
    https://bibliotekanauki.pl/articles/351834.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    polymer segmental dynamics
    colloids
    granular matter
    mechanical spectroscopy
    segmentowe relaksacje amorficznych polimerów
    koloidy
    materia
    spektroskopia mechaniczna
    Opis:
    The general trend in soft matter is to study systems of increasing complexity covering a wide range in time and frequency. Mechanical spectroscopy is a powerful tool for understanding the structure and relaxation dynamics of these materials over a large temperature range and frequency scale. In this work, we collect a few recent applications using low-frequency mechanical spectroscopy for elucidating the structural changes and relaxation dynamics in soft matter, largely based on the author’s group. We illustrate the potential of mechanical spectroscopy with three kinds of soft materials: colloids, polymers and granular systems. Examples include structural changes in colloids, segmental relaxations in amorphous polymers, and resonant dissipation of grain chains in three-dimensional media. The present work shows that mechanical spectroscopy has been applied as a necessary and complementary tool to study the dynamics of such complex systems.
    Ogólnym trendem w miękkiej materii jest, aby badać układy o rosnącej złożoności, obejmującej szeroki zakres czasu i częstotliwości. Spektroskopia mechaniczna jest potężnym narzędziem dla zrozumienia struktury i dynamiki relaksacji tych materiałów w szerokim zakresie temperatury i skali częstotliwości. W niniejszej pracy, zebraliśmy kilka ostatnich zastosowań spektroskopii mechanicznej niskiej częstotliwości do poznania zmian strukturalnych i dynamiki relaksacji w miękkiej materii, w dużej mierze opartych na grupie autorów. Opisujemy potencjał spektroskopii mechanicznej w przypadku trzech rodzajów materiałów miękkich: koloidów, polimerów i układów ziarnistych. Przykłady obejmują zmiany strukturalne w koloidach, segmentowe relaksacje amorficznych polimerów, i rezonansowe rozpraszanie łańcuchów ziaren w mediach trójwymiarowych. Niniejsza praca pokazuje, że spektroskopię mechaniczną zastosowano jako niezbędne i uzupełniające narzędzie do badania dynamiki takich systemów złożonych.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3A; 2077-2083
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Presence of Iron in Highly Alkaline Polyaluminium Chlorides on the Effectiveness of Precursors of Disinfection By-Products Removal
    Autorzy:
    Krupińska, Izabela
    Powiązania:
    https://bibliotekanauki.pl/articles/27314882.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    humic acid
    polyaluminium chlorides
    organic substances
    fulvic acids
    iron-organic complexes
    protective colloids
    kwas humusowy
    chlorek poliglinu
    substancje organiczne
    kwasy fulwowe
    kompleksy żelazowo-organiczne
    koloidy ochronne
    Opis:
    The mechanism of coagulation with highly alkaline polyaluminum chlorides is well understood, but there is a lack of information on the effect of the presence of iron in these coagulants on the efficiency of purifying water with increased contents of natural organic matters among which humic substances are precursors of disinfection by-products. The dissolved forms of organic substances are the most problematic with regard to water treatment because major concern is the formation of disinfection by products resulting from reactions between dissolved organic matter fractions and disinfectants. The aim of this study was to evaluate the effectiveness of precursors of disinfection by-products removal using highly alkaline polyaluminium chlorides that had different alkalinity and iron content. In the water after the coagulation process a value of SUVA254 was calculated because this indicator correlates well with dissolved organic matter reactivity and disinfection by-products. The analysis of the obtained results showed that the effectiveness of dissolved organic matter removal was determined by the formation of colored iron-organic complexes.
    Źródło:
    Civil and Environmental Engineering Reports; 2023, 33, 1; 109--121
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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