Wyniki wyszukiwania - BazTech

1

Forward osmosis as an effective concentration method for cationic surfactant solutions

Klimonda Aleksandra, Kowalska Izabela

Gaz, Woda i Technika Sanitarna

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2024

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Nr 2

31--38

EN

The paper presents experimental results on the effectiveness of forward osmosis (FO) for the recovery and concentration of cationic surfactants (quaternary ammonium salts) from solutions with a wide range of concentrations (50-1000 mg/L). The membrane process ensured an almost 100% separation of cationic surfactants and an effective concentration of the solution components without a leakage into the receiving solution. It has been shown that FO is a membrane technique that allows achieving the goals of a circular economy through an effective concentration and recovery of the compounds and water from the purified solutions.

PL

W pracy przedstawiono wyniki badań dotyczących skuteczności osmozy prostej (FO) do odzyskiwania i zatężania kationowych substancji powierzchniowo czynnych (czwartorzędowych soli amoniowych) z roztworów o szerokim zakresie stężeń (50-1000 mg/L). Proces membranowy zapewniał niemal 100% separację kationowych substancji powierzchniowo czynnych oraz skuteczne zatężenie składników roztworu bez ich przecieku do roztworu odbierającego. Wykazano, że FO jest techniką membranową pozwalająca na osiągnięcie celów gospodarki o obiegu zamkniętym, poprzez skuteczne zatężanie oraz odzyskiwanie składników oczyszczanego roztworu i wody.

2

Surfactant fouling in pressure-driven membrane processes

Klimonda Aleksandra, Kowalska Izabela

Environment Protection Engineering

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2023

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Vol. 49, nr 4

109--119

EN

The fouling phenomenon of porous polymeric ultrafiltration and nanofiltration membranes was investigated during the purification of solutions containing surfactants. The effects of surfactant type, concentration, and membrane pore size on process performance were evaluated. The highest intensity of membrane fouling was caused by micellar solutions, resulting from the coexistence of monomeric and aggregated surfactant forms. A significant role of hydrophobic/hydrophilic interactions between surfactants and the polymer surface in membrane fouling was proved. Interpretation of the theoretical fouling model showed that cake formation is the dominant fouling mechanism of membranes.

3

Separation and concentration of cationic surfactant solutions with the use of ceramic modules

Klimonda Aleksandra, Kowalska Izabela

Environment Protection Engineering

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2020

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Vol. 46, nr 2

41--51

EN

This paper presents the findings of experimental research on employing ultrafiltration and microfiltration ceramic modules (150 kDa, 0.14 μm, 0.45 μm) for removal and concentration of the cationic surfactant Tequat LC90i (TEAQ) from water solutions. The filtration tests were performed at a semi-pilot installation in a crossflow regime. The feed solution parameters (surfactant concentration, pH of the treated solution, the presence of inorganic salt), and process conditions (transmembrane pressure and linear velocity) on the membrane filtration efficiency were evaluated. In all tests, very satisfactory TEAQ retention coefficients (in the range of 70–95) have been achieved. However, surfactant fouling occurred resulting in deterioration of the permeability of the modules. Modules characterized by the pore sizes greater than the size of surfactant particles (i.e., 0.45 μm modules) proved to be the most fouling resistant ones. It was also proven that process performance at high linear flow velocity can efficiently reduce the intensity of membrane pore blocking.