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Electrospun niobium oxide 1D nanostructures and their applications in textile industry wastewater treatment

Zaborowska Marta, Smok Weronika, Tański Tomasz

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2023

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Vol. 71, nr 2

art. no. e144941

EN

Textile industry emits daily huge amounts of sewage rich in non-biodegradable organic compounds, especially in textile dyes. Such contaminants are highly soluble in water, which makes their removal difficult. Other studies suggest their carcinogenicity, toxicity and mutagenicity. A promising chemical treatment of textile wastewater is the photodegradation of dye molecules in the process of photocatalysis in the presence of a photocatalyst. One-dimensional nanostructures exhibit a high surface-to-volume ratio and a quantum confinement effect, making them ideal candidates for nanophotocatalyst material. Nb2O5 is, among other metal oxides with a wide band gap, gaining popularity in optical applications, and electrospun niobium oxide nanostructures, despite their ease and low cost, can increase the chemical removal of textile dyes from wastewater. Facile synthesis of electrospun one-dimensional niobium oxide nanofibers is presented. The nanophotocatalysts morphology, structure, chemical bonds and optical properties were examined. Based on photodegradation of aqueous solutions (ph=6) of methylene blue and rhodamine B, the photocatalytic activity was established. The photocatalytic efficiency after 180 minutes of ultraviolet irradiation in the presence of Nb2O5 nanofibers was as follows: 84.9% and 31.8% for methylene blue and rhodamine B decolorization, respectively.

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Microscopic Analysis of Activated Sludge in Industrial Textile Wastewater Treatment Plant

Paździor Katarzyna, Bilińska Lucyna

Autex Research Journal

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2022

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Vol. 22, no. 3

358--364

EN

The relationship between a quality of activated sludge microbiota and wastewater treatment plant (WWTP) operational stability has been defined in the past few decades. However, this dependence is not so clear in the case of industrial wastewater treatment. In this article, a very specific example of industrial textile wastewater treatment plant (ITWTP) is analyzed. Textile effluents are well known as highly contaminated wastewater containing many biodegradable compounds. Microscopic analysis included flocs morphology examination, attempts to evaluate the Sludge Biotic Index (SBI), and identification of dominant filamentous microorganisms. Routine operational control of ITWTP covered pH, temperature, redox potential, dissolved oxygen and COD measurements. The average ecosystem existing in the described ITWTP differed significantly compared to municipal WWTPs. The flocs were smaller and irregular. Filamentous bacteria did not cause foaming although filaments index reached 4. Nostocoida limicola I dominated with significant amounts of type 0041 and type 021N. The evaluation of SBI was impossible as the most of protozoan was in the form of cysts. The overall microbiota diversity correlated with COD removal in activated sludge unit of ITWTP.

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Membrane Fouling Effect During Nanofiltration of Wastewater from Dyeing Cellulose and Polyamide Fabrics

Żyłła R., Sójka-Ledakowicz J., Kamińska I.

Fibres & Textiles in Eastern Europe

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2016

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Vol. 24, no. 6 (120)

225--233

EN

The aim of research was to compare the parameters of nanofiltration of textile wastewater generated in two different dyeing processes. Tests were carried out for wastewater from dyeing cellulose fibres with direct and reactive dyes and from dyeing polyamide fibres with acid dyes. The applicability of selected nanofiltration membranes, including polysulfone, cellulose acetate and polyamide membranes, in the filtration of some wastewater streams was examined. Research was carried out to investigate the fouling of membranes during wastewater nanofiltration. During the filtration of the wastewater after reactive dyeing, a significant reduction in the process efficiency due to membrane fouling was observed. In the case of wastewater from the dyeing of polyamide fibres, a reduction in the process efficiency during the membrane operation did not occur at all or was very small.

PL

Celem badań było porównanie parametrów nanofiltracji ścieków włókienniczych pochodzących z dwóch różnych procesów barwienia. Badania przeprowadzono dla ścieków pochodzących z barwienia włókien celulozowych barwnikami bezpośrednimi i reaktywnymi, oraz ścieków z procesów barwienia wyrobów z włókien poliamidowych barwnikami kwasowymi. W pracy sprawdzono możliwość zastosowania wybranych membran nanofiltracyjnych (w tym polisulfonowych, z octanu celulozy i poliamidowych) w procesie filtracji wybranych strumieni ścieków. Badania prowadzono pod kątem zjawiska foulingu membran w trakcie nanofiltracji ścieków. Podczas filtracji ścieków z barwienia reaktywnego zaobserwowano znaczne obniżenie wydajności procesu na skutek efektu foulingu membrany. W przypadku ścieków z barwienia włókien poliamidowych, zjawisko redukcji wydajności procesu w trakcie pracy membrany nie występowało, lub było niewielkie.