Estudio de viabilidad de la reutilización de baños de tintura textil

En este trabajo se hace un estudio de viabilidad técnica y económica de la integración de un tratamiento de decoloración de baños agotados de tintura a un proceso de tintura téxtil convencional con el objetivo de reutilizar el agua tratada y en especial, de aprovechar la sal necesaria para realizar la tintura. El tratamiento de decoloración se lleva a cabo en una celula electroquímica asistida por luz ultravioleta y el agua decolorada es almacenada en un deposito para su posterior reutilización en el proceso de tintura. La implementación de este sistema de tratamiento y reutilización permite ahorrar el 70% de agua y el 60% de la sal necesarios para preparar los banos de tintura. Lo que aparte de reportar una horro económico directo, también supone un ahorro en el cánon de vertido de aguas residuales. Por el contrario, si se quiere hacer un proceso ininterrumpido de sucesivas reutilizaciones, en algunas ocasiones y en función del color requerido, debe aumentarse la cantidad de colorante respecto de la fórmula inicial para evitar una merma en la calidad de las tinturas y precisamente por ello es importante la realización del estudio económico para demostrar su viabilidad

Gestión de residuos a lo largo del ciclo de vida de un automóvil

El estudio que se desarrolla a continuación tiene el objetivo de analizar los sectores y procesos de reciclaje de los residuos generados por un vehículo a lo largo desu vida útil. Se pretende detectar posibles lagunas  existentes en la actualidad y proponer mejoras organizativas según las carencias detectadas. Este estudio se realiza en definitiva, analizando el sector automovilístico y el reciclaje que se lleva acabo en el mismo, teniendo en cuenta la aplicación de la Directiva Europea2000/53 en el Estado Español y repasando los procesos de reciclaje de los diferentes componentes de un vehículo.  Mediante las carencias detectadas en dichos procesos se propone la mejora de la gestión de los residuos en los talleres con la creación de un SIG (Sistema Integrado de Gestión)

Comparison of different wastewater treatments for colour removal of reactive dye baths

The generation of high-coloured wastewater is one of the main environmental problems of the textile industry. Reactive dyes are widely used in the dyeing of cellulosic fibres. However, they have low exhaustion degree (70–90%). The degradation of residual dyes by aerobic biological treatment is very poor, being necessary the application of specific treatments. In this work, three different methods for the removal of reactive dyes were compared: electrochemical treatment, coagulation with Moringa oleifera waste and enzymatic treatment with laccase. Two azo bifunctional dyes with different reactive groups were selected: C.I. Reactive Black 5 (vinyl sulphone) and C.I. Reactive Red 231 (chlorotriazine). The influence of pH (5 and 9) and dye hydrolysis on the decolourisation yield was studied. The electrochemical treatment was the most efficient, with 95–100% colour removal yield. The coagulation with M. oleifera waste also achieved high colour removal efficiency (91–94%). Both methods showed an independent behaviour with respect to pH or dye hydrolysis. The enzymatic treatment should be performed at pH 5. This method was suitable to remove the chlorotriazine dye (92–93% efficiency), whereas the vinyl sulphone one showed a marked dependence on dye hydrolysis: moderately efficient for the hydrolysed dye and highly efficient without hydrolysis. The activity of laccase was not modified by the usual salinity of the reactive dyeing effluent (20 g/L NaCl). Nevertheless, the effluent salinity enhanced the electrochemical and M. oleifera treatment yield.Peer ReviewedPostprint (author’s final draft

Treatment of textilewaste water by CAS, MBR, and MBBR: A comparative study from technical, economic, and environmental perspectives

In this study, three different biological methods—a conventional activated sludge (CAS)system, membrane bioreactor (MBR), and moving bed biofilm reactor (MBBR)—were investigatedto treat textile wastewater from a local industry. The results showed that technically, MBR was themost efficient technology, of which the chemical oxygen demand (COD), total suspended solids (TSS),and color removal efficiency were 91%, 99.4%, and 80%, respectively, with a hydraulic retention time(HRT) of 1.3 days. MBBR, on the other hand, had a similar COD removal performance comparedwith CAS (82% vs. 83%) with halved HRT (1 day vs. 2 days) and 73% of TSS removed, while CAShad 66%. Economically, MBBR was a more attractive option for an industrial-scale plant since itsaved 68.4% of the capital expenditures (CAPEX) and had the same operational expenditures (OPEX)as MBR. The MBBR system also had lower environmental impacts compared with CAS and MBRprocesses in the life cycle assessment (LCA) study, since it reduced the consumption of electricityand decolorizing agent with respect to CAS. According to the results of economic and LCA analyses,the water treated by the MBBR system was reused to make new dyeings because water reuse in thetextile industry, which is a large water consumer, could achieve environmental and economic benefits.The quality of new dyed fabrics was within the acceptable limits of the textile industry.This research was co-funded by ACCIÓ (Generalitat de Catalunya) within the REGIREU Project (COMRDI16-1-0062).Peer ReviewedPostprint (published version

Métodos de eliminación del color en efluentes de tintura textil

La industria textil por vía húmeda genera grandes cantidades de agua residual en sus procesos productivos, principalmente en las operaciones de ennoblecimiento (preparación, tintura y acabado). El sector textil precisa de tratamientos primarios, secundarios y tratamientos avanzados para eliminar la materia orgánica, sólidos no eliminados anteriormente y el color. En especial, la eliminación de los colorantes en este tipo de efluentes representa un reto tecnológico en los procesos de tratamiento de aguas residuales. Se estima que mundialmente se descargan 280.000 toneladas de colorantes en los efluentes textiles. La compleja mezcla de colorantes y compuestos que se emplean para el acabado, hace que las aguas residuales de la industria textil sean difíciles de tratar sólo por medio de sistemas biológicos o fisicoquímicos convencionales, por lo que se requieren estudios de tecnologías innovadoras para completar la depuración. The wet textile industry generates large amounts of waste water in their production processes, especially in finishing operations (preparation, dyeing and finishing). Conventional technologies for colour removal are being implemented on an industrial scale, offering good levels of discoloration, but all have in common, their high cost. Recently, many research groups worldwide are working on a laboratory scale and pilot plant in what may be termed as “New technologies for colour removal”, although some of them are based on traditional methodsPostprint (author’s final draft

Respirometric study of optical brighteners in textile wastewater

Optical brighteners (OBs) are colorless fluorescent dyes, widely used in industry to improve whiteness in materials. Nearly 80% of all OBs in the market are derivatives of stilbene. They absorb the near-ultraviolet light and re-emit most of it in the blue range as visible fluorescence. OBs are commonly applied on textiles, detergents, paper and plastic products, among others. OBs have a low degradation ratio. In biological plants, they can only be partially removed by adsorption into the sludge and a tertiary treatment could be required to fully remove them. Part of them may persist and can be found in river and lake waters. The current work aims to evaluate the effect of the OBs in the bacterial activity of biological wastewater treatment plants. The influence of two commercial OBs (Goldblanc BHA and Leucophor PC) on respiration rate was monitored by means of a semi-continuous electrolytic respirometer, in order to obtain information related to the growth of the biomass and the degradation of the substrate. Their acute toxicity was also determined. It was concluded that the OB effect on bacteria population is variable depending on its chemical structure. Unlike the former, the Leucophor-PC brightener had an impact on the respirometric rate.Peer ReviewedPostprint (published version

Entanglement between more than two hundred macroscopic atomic ensembles in a solid

We create a multi-partite entangled state by storing a single photon in a crystal that contains many large atomic ensembles with distinct resonance frequencies. The photon is re-emitted at a well-defined time due to an interference effect analogous to multi-slit diffraction. We derive a lower bound for the number of entangled ensembles based on the contrast of the interference and the single-photon character of the input, and we experimentally demonstrate entanglement between over two hundred ensembles, each containing a billion atoms. In addition, we illustrate the fact that each individual ensemble contains further entanglement. Our results are the first demonstration of entanglement between many macroscopic systems in a solid and open the door to creating even more complex entangled states.Comment: 10 pages, 8 figures; see also parallel submission by Frowis et a

Examining mindfulness and moral disengagement in doping: Perspective of Turkish wrestlers

Introduction: Studies related to attitudes toward the use of prohibited substances in Turkish athletes are scarce. The World Anti-Doping Agency (WADA) has implemented anti-doping educational policies emphasizing doping-related education in studies conducted among Turkish wrestlers. However, it is still unclear the extent to which the wrestlers comply and adhere to these anti-doping policies. No research has previously examined the effect of anti-doping education on athletes' mindfulness and moral disengagement in doping (MDD). Therefore, the present study has a two-fold objective: first, to examine whether doping-related education (DRE) and the status of being a national athlete (NA) have an effect on athlete mindfulness and MDD. Second, to analyze the relationship between each sub-dimensions of athlete mindfulness: awareness (ASD), judgment (JSD), and refocus (RSD) with MDD. Methods: A total of 409 male wrestlers participated in this study. MANOVA analysis showed that NA and DRE alone have no effect on MDD but have a general effect on mindfulness. Results: The highest effect was on the ASD of being an NA ((Formula presented.) = 0.173). When the interaction effect of NA*DRE was examined, significant difference in MDD (F = 8.218, p = 0.004), ASD (F = 8.476, p = 0.004), JSD (F = 5.844, p = 0.016), and RSD (F = 11.476, p = 0.001) were found. MDD has a weak negative relationship with ASD (r = ?0.126) and RSD (r = ?0.041) and a weak positive relationship with the JSD sub-dimension (r = 0.140). Those results suggest that being a NA and having received anti-doping education affect moral disengagement in doping and athletes' mindfulness. Discussion: As a conclusion, it is recommended to increase awareness and anti-doping education among national-standard Turkish wrestlers to prevent them from engaging in doping behaviors. Copyright © 2023 Ayyıldız, Kayabeşler, Gülü, Yagin, Aldhahi, García-Grimau and Al-Mhanna.Princess Nourah Bint Abdulrahman University, PNU: PNURSP2023R 286This research was funded by Princess Nourah bint Abdulrahman University Researchers Supporting Project number (PNURSP2023R 286), Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia