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AKYILDIZ, SİNEM HAZAL

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AKYILDIZ

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SİNEM HAZAL

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    PublicationOpen Access
    Detection and analysis of microfibers and microplastics in wastewater from a textile company
    (2022-10-01) YALÇIN, BAHATTİN; AKYILDIZ, SİNEM HAZAL; Akyildiz S. H. , Yalçın Eniş I., Sezgin H., Yalçin B.
    Textile wastewater is polluted by inorganic/organic substances, polymers, dyes, and microfibers (MFs), which are microplastics (MPs) and natural fibers. This work is aimed at the preliminary investigation of MFs and MPs in textile industrial wastewater, and at evaluating the removal efficiency of an on-site wastewater treatment plant (WWTP). Ten samples of inflows and outflows of the WWTP of a textile company (applying a physic-chemical process) have been analyzed. Firstly, the samples underwent a pretreatment with 15% hydrogen peroxide at 25◦C for 5 days to remove organic compounds. Secondly, the MFs were recovered from the aqueous phase by pre- screening centrifugation, density separation, and filtration as alternative options. Filtration obtained the best performances, compared to the other recovery processes. Thirdly, the MFs were counted through optical microscopy and the MPs were identified through micro-FTIR. The MFs amount in the inflow samples was in the range of 893–4452 MFs/L. The outflow samples (310–2404 MFs/L) exhibited a 38–65% reduction compared to the inflows, demonstrating that up to 62% of residual MFs can enter the sewer network or the receiving water body. Cotton and wool, and numerous MPs (acrylic, polyester, polypropylene, polyamide, and viscose/rayon) were identified in the inflow and outflow samples (with the only exception of \"dense\" viscose (rayon), not detected in the out- flows, and probably retained by the WWTP with the sludge). This study, even if just preliminary, offers interesting hints for future research on MFs/MPs detection in textile wastewater, and on the performance of a full-scale WWT process for their removal.
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    PublicationOpen Access
    Examining the Importance of Pretreatment to Capture and Analyze Microfibers from Textile Wastewater
    (2022-09-10) AKYILDIZ, SİNEM HAZAL; YALÇIN, BAHATTİN; Akyildiz S. H., Yalçin B., Yalçın Eniş I., Sezgin H.
    The textile industry is one of the causes of environmental problems, which have a negative effect on all organisms in the ecosystem. In addition to the textile wastes generated by the textile industry, wet processes (dyeing, rinsing, softening, mechanical/chemical finishing) release inorganic compounds, polymers, organic products, dyes, and microfibers (MFs) into the environment. Microfibers may also accumulate in marine species and be passed to higher trophic levels, including humans, through the food chain. In order to solve this problem, it is first necessary to correctly identify it. These stages are sample pretreatment, microplastic separation, and characterization/quantification. The aim of this research is to assess the significance of sample pretreatment in detecting microfibers in wastewater from various parts of a textile company. For the purpose of observing the effect of organic removal, half of the wastewater from each process was pretreated, while the other half was not. A 6-hour pretreatment at 60 °C with Fenton's reagent was performed. A microscope and FTIR were used to investigate the MFs collected on the filter. In particular, due to the rich amount of organic matter in inflow and outflow wastewater, the lack of pretreatment made the analysis very difficult. Additionally, the FTIR analysis failed to detect some of the distinctive peaks that should have been visible in the materials.