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Podstawy teoretyczne napowietrzania wody i ścieków metodą barbotażu

Błażejewski Ryszard

Technologia Wody

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2023

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Nr 1 (79)

45-50

PL

Artykuł prezentuje bilans tlenowy dla cieczy w komorze napowietrzania oraz podstawowe pojęcia i terminy związane z napowietrzaniem wody i ścieków metodą barbotażu. Przedstawiono uproszczoną procedurę wyznaczania właściwej powierzchni międzyfazowej (gaz-ciecz), pozwalającą na dobór dyfuzorów napowietrzających do danej komory napowietrzania wody lub ścieków, w tym-ścieków oczyszczanych metodą osadu czynnego. Zastosowanie tej procedury i omówionych parametrów technicznych pokazano na przykładzie obliczeniowym.

EN

The article presents the oxygen budget for an aeration chamber and basic concepts and terms related to the aeration of water and wastewater using diffused air bubbles. A simplified procedure for determining the specific interfacial surface area (gas-liquid) has been presented, allowing for the selection of diffusers for a given water or sewage aeration chamber, including bioreactors with the activated sludge. An application of this procedure and the discussed technical parameters is illustrated by a worked example.

2

Fabrication of transparent polysiloxane coatings on a glass support via the sol-gel dip coating technique and the effect of their hydrophobization with hexamethyldisilazane

Chodkowski Michał, Terpiłowski Konrad, Pasieczna-Patkowska Sylwia

Physicochemical Problems of Mineral Processing

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2020

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Vol. 56, iss. 6

76--88

EN

This study aimed at synthesis, preparation, and physicochemical properties investigation of undoped polysiloxane-based coatings deposited on the glass supports. The other goal was to test the effectiveness of their hydrophobization with hexamethyldisilazane at an elevated temperature using a bubbler. The coatings were obtained in a sol-gel process by acid-assisted hydrolysis of tetraethoxysilane and they were applied to the glass supports using the dip coating technique with various withdrawal speeds. The synthesized composition was scanned using TurbiscanLAB and its particle size was determined by means of the dynamic light scattering technique. The obtained surfaces were examined based on the water wettability measurements, photoacoustic spectroscopy, and transmittance measurements. It was found that the stability of the sol did not change during the dip-coating. Smooth, homogeneous, uniform, hydrophobic, and transparent coatings on the glass supports were obtained. Their wettability was determined by the contact angle in the range from 83.5 to 95.2 degrees and very low contact angle hysteresis. The hydrophobic effect obtained by modification with hexamethyldisilazane appears to be permanent – the contact angles do not change significantly after 7 days. The synthesized sol composition appears to be a good starting point for its chemical and physical modification for hydrophobicity increase and surface properties modification. Moreover, the hydrophobization of the coatings with hexamethyldisilazane at an elevated temperature using the bubbler did not have the desired effect.

3

Sterownik do wieloetapowych procesów technologicznych

Łukasiak L., Grabowski J., Nowek P., Stankiewicz K., Beck R. B., Jakubowski A.

Elektronika : konstrukcje, technologie, zastosowania

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2004

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Vol. 45, nr 10

22-23

PL

Przedstawiono sprzęt i oprogramowanie sterownika pieca do wieloetapowych procesów technologicznych stosowanych przy wytwarzaniu struktur półprzewodnikowych. Sterownik zaprojektowano w Instytucie Mikroelektroniki i Optoelektroniki Politechniki Warszawskiej.

EN

Equipment for automated operation of a furnace for fabrication of semiconductor structures is presented together with the controlling software. The system was designed in the Institute of Microelectronics & Optoelectronics, WUT.