Wyniki wyszukiwania - BazTech

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The removal of organic compounds by natural and synthetic surface-functionalized zeolites: a mini-review

Muir B., Wołowiec M., Bajda T., Nowak P., Czupryński P.

Mineralogia

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2017

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Vol. 48, iss. 1/4

145--156

EN

The use of zeolites as sorbents has been investigated as a replacement for existing costly methods of removing organic contaminants from water solutions. Zeolites can be modified by inorganic salts, organic surfactants, metals or metal oxides in order to increase their adsorption capacity. The unique ion exchange and adsorption properties of zeolites make them very suitable for application in the removal of organic compounds such as volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), phenols and other complex petrochemicals. Many different studies have demonstrated their effectiveness in reducing the concentrations of organic contaminants as well as petroleum derivatives in water, which has been summarized in this paper.

2

Current stage of knowledge relating to the use ferruginous sludge from water treatment plants – a preliminary review of the literature

Wołowiec M., Bajda T.

Mineralogia

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2017

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Vol. 48, iss. 1/4

39--45

EN

In water treatment plants, a large amount of wastewater and sludge is generated during the processing of drinking water. The composition of the sludge is determined by the type and raw water chemistry, as well as the methods and materials used for purification. The major components of the sludge are iron and manganese oxyhydroxides. In the past, the sludge was landfilled, but for environmental reasons it became necessary to find uses for the sludge. The aim of this study was to identify examples of using this sludge. Nowadays, the sludge is applied in the treatment of municipal wastewater, agriculture, and the production of cement and bricks, among others. Attention was also paid to the possibility of using the water processing sludge in different sorption applications.

3

Sorption of organic compounds by organo-zeolites

Wołowiec M., Muir B., Bajda T.

Geology, Geophysics and Environment

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2016

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Vol. 42, no. 1

139--140

EN

Organic compounds such as BTEX and PAHs are one of the most common contaminants in water system. These contaminants would take decades to degrade and they have harmful effects on human health (Qin et al. 2008). Several treatment methods have been developed to remove those contaminants from industrial wastewater. They include ion-exchange, filtration, adsorption and the use of various types of sorbents for example zeolites (Kibazohi et al. 2004, Mathur et al. 2007, Aivaliotiet al. 2012, Almeida et al. 2012). Natural clinoptilolite (Cp) from the Bystré deposit in Slovakia and zeolite Na-X synthesized from fly ash has been modified with a hexadecyltrimethyl ammonium bromide (HDTMA) in amounts of 1.0 and 2.0 of external cation exchange capacity (ECEC) of the zeolites (Szala et al. 2013). The sorption properties of unmodified zeolites and organo-zeolites in terms of aqueous solutions of benzene, ethylobenzene, toluene, p-xylene (BTEX) and their mixtures as well as anthracene, naphthalene, benzo[a]pyrene, dibenzo[a,h]anthracene (PAHs) and their mixtures at different concentrations were evaluated. The results showed that the modification of the zeolite Na-X and Cp with HDTMA improves the sorption properties. Modification in the amount of 1.0 ECEC proved to be the best in terms of p-xylene, anthracene, naphthalene, benzo[a]pyrene, dibenzo[a,h]anthracene. On the other hand benzene, ethylobenzene and toluene were adsorbed the most effectively by 2.0 ECEC modification of Na-X and Cp. Based on experimental data, the removal efficiencies for BTEX follows the order: p-xylene > toluene > benzene > ethylobenzene, for POHs: dibenzo[a,h]anthracene > benzo[a] pyrene > anthracene > naphthalene. P-xylene and naphtalene were adsorbed in the greatest quantity and benzene and anthracene in the lowest quantity from the mixtures of BTEX and PAHs, respectively. The sorption efficiency depends on the physicochemical properties of the organic compounds (dipole moment, molar mass, molecule structure and the time of the sorption process) as well as natural Cp and synthetic zeolite Na-X properties, such as Si/Al ratio, texture parameters and external cation exchange capacity. With an increasing concentration of the hydrocarbons in the solution the sorption capacity increases (Szala et al. 2015). Natural Cp is a better sorbent than synthetic zeolite Na-X in case of BTEX sorption, while PAHs are adsorbed more effectively by zeolite Na-X and its modifications. The mechanism of the sorption consists on the dissolving of the organic compounds into the organic layer of the surfactant (on the zeolites’ surface) as well as on the organic compounds’ penetration into the mesopores.

4

Dokładność pomiaru średnic na urządzeniu specjalizowanym do pomiaru odchyłek kształtu

Gapiński B., Wołowiec M., Kołodziej A.

Mechanik

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2013

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R. 86, nr 7

567--570

PL

Przedstawiono analizę dokładności pomiaru średnicy na urządzeniu specjalizowanym do pomiaru odchyłek kształtu. Zweryfikowano wpływ średnicy wzorca oraz konfigurację końcówki pomiarowej na wynik pomiaru elementów o różnych średnicach. Równolegle przebadano wpływ wymienionych parametrów na klasyczny pomiar odchyłki okrągłości. Na podstawie przeprowadzonych badań opracowano zalecenia pozwalające na efektywne zastosowanie urządzeń specjalizowanych do pomiaru odchyłek kształtu przy pomiarach średnic.

EN

The paper presents an analysis of the accuracy of measuring the diameter on specialized equipment to measure the deviation of form. The impact of both the standard diameter and configuration of measuring tip on result of measured elements of different diameters was verified. Simultaneously, examination of the effect of previously mentioned parameters on the classic measurement of roundness deviation was conducted. Based on carried investigations, recommendations for the effective use of specialized form tester applied form measurement of diameter were developed.

5

Zastosowanie układów reprogramowalnych do realizacji wydajnego systemu przeciwdziałania włamaniom

Botowicz J., Wołowiec M., Buciak P., Sapiecha P.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2006

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nr 5

152-155

PL

Przedstawiono architekturę systemów przeciwdziałania włamaniom oraz zaprezentowano wyniki implementacji komponentów takiego systemu z użyciem układów reprogramowalnych. Przedstawione komponenty to: moduł wykrywania wzorców ataku oraz moduł śledzenia tras ataków sieciowych.

EN

In this article common architecture for Intrusion Prevention Systems has been presented. Using this architecture, two sample components: pattern matching module and IP traceback module were described.