Heterogeneous Fenton treatment of textile wastewater using rGO/nZVI: Batch and flow column evaluation

This work reports the successful synthesis and application of α-Cu-FeOOH in heterogeneous Fenton treatment of actual textile dyeing wastewater. The material characteristics were analyzed by SEM, EDX, BET, FTIR, and XRD methods. In heterogeneous Fenton tests, the highest TOC and color removal efficiencies were found to be 46.88 and 37.98%, respectively, in the suitable conditions of Cu/Fe molar ratio = 5%, [H2O2] = 0.1 M, [α-Cu-FeOOH] = 0.6 g/L, pH = 7, and after 60 min. The values of color and TOC after treatment well met the discharge standard for textile dyeing wastewater (QCVN 13:2015/BTNMT, Column B). The presence of copper in the material enhanced the activation of H2O2 in heterogeneous Fenton reactions under neutral environments. Therefore, α-Cu-FeOOH material has great potential for practical application in textile wastewater treatment with an initial color of 185.6 mg/L and TOC concentration of 72.54 mg/L.

BackgroundThe textile industry represents a great portion of the global industry due to the increase in population and demand for sustainable products. Tons of textile wastewater contain predominantly synthetic complex organic dyes like direct dyes, processing dyes, reactive dyes, etc., making discharge of colored effluents challenging.Main body of the abstractTextile wastewater treatment is essential to maintain the environmental balance and reduce public health threats. Conventional wastewater treatment methods cannot overcome and decompose these toxic wastes; therefore, numerous modern approaches have been studied and implemented for pollutant degradation to be suitable for environmental disposal. Membranes and photocatalysis have proven their significant effect on the photodegradation of different dyes and the production of pure water for further use in industrial purposes.Short conclusionThis review paper aims to represent a comprehensive review of textile dyeing wastewater treatment by integrating polyvinylidene fluoride (PVDF) and titanium dioxide (TiO2) in a hybrid system named “photocatalytic membrane reactor, PMR”.

Applicability of a new pre-hydrated industrial grade polyaluminium salt for the decolourisation of textile wastewater

• Microalgae cultivation integrated with plasmolysis to treat real TWW. • Applying plasma pre-treatment before microalgae cultivation improves growth efficiency. • Plasma treating TWW leads to higher biomass and lipid production. • Pretreatment of plasma reduces the color content up to 89 % from TWW. Microalgae cultivation offers a promising alternative to conventional wastewater treatment. However, microalgae cultivation is hindered in real wastewater treatment due to the high concentration of contaminates, complex organic compounds, and non-sterilization, which reduces microalgae growth. Therefore, the current hypothesis is to integrate plasmolysis and microalgae treatment for real textile wastewater (TWW) treatment, which can provide a sustainable approach to removing pollutants without adding harmful chemicals. The air plasma produced different oxidizing species, such as ozone, superoxide, atomic oxygen, and hydroxyl radical, capable of decomposing complex organic pollutants, dyes, and toxic compounds commonly found in TWW. This pre-treatment detoxifies the wastewater, making it safer for microalgae and reducing its color content and turbidity while enhancing light penetration. Hence, this study treats real TWW by integrating plasmolysis with microalgae technology. The results show that textile wastewater using plasmolysis reduces the 89.11 % color content in 20 min using air Corona-DBD plasma at 5 kV, 26 kHz, and 10 mA. Afterward, plasma-treated wastewater (OTWW) is introduced into the bioreactor for microalgae cultivation, and the results show a significant increase in microalgae growth in OTWW compared with TWW.

A multifaceted aggregation and toxicity assessment study of sol–gel-based TiO2 nanoparticles during textile wastewater treatment

Treatment of the highly polluting and variable textile industry wastewater using aerobic granular sludge (AGS) sequencing batch reactors (SBRs) has been recently suggested. Aiming to develop this technology application, two feeding strategies were compared regarding the capacity of anaerobic-aerobic SBRs to deal with disturbances in the composition of the simulated textile wastewater feed. Both a statically fed, anaerobic-aerobic SBR and an anaerobic plug-flow fed, anaerobic-aerobic SBR could cope with shocks of high azo dye concentration and organic load, the overall chemical oxygen demand and color removal yields being rapidly restored to 80%. Yet, subsequent azo dye metabolite bioconversion was not observed, along the 315-day run. Moreover, switching from a starch-based substrate to acetate in the feed composition deteriorated AGS stability. Overall, the plug-flow fed SBR recovered more rapidly from the imposed disturbances. Further research is needed towards guaranteeing long-term AGS stability during the treatment of textile wastewater.

Textile wastewater treatment in anaerobic reactor: Influence of domestic wastewater as co-substrate in color and COD removal

Copyright © 2015, Zahedan University of Medical Sciences. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited. Textile dyeing industries wastewaters are contain significant amounts of organic dye compounds. Presence of organic dyes in industrial effluents due to avoid light penetration into the water, impaired photosynthesis, decreased oxygen transport into the water, the solubility of gases and their toxic effects, irreparable damage to the environment [1]. So, treatment of colored wastewater of textile industries before discharging them into the environment is essential. Biological treatment processes for textile wastewater treatment is rarely used. These processes are commonly used to remove biological decomposition of organic compounds and suspended solids are effective but not efficient for the removal of dyes from textile wastewaters, because the colored compounds containing resistant and complex structures that can be done to slow down the rate of biodegradation of colors. The most commonly methods for color removal from textile wastewater are physical-chemical methods such as coagulation, flocculation, adsorption, ozonation, reverse osmosis, membrane filtration and advanced oxidation [2]. Each of these methods has advantages and disadvantages for the removal of dyes from wastewater. The main advantages of colored wastewater using coagulation and flocculation process, not the production of intermediate products that are toxic and harmful, mainly because of the color compounds in this way is not decomposed. In addition, this method is relatively high cost and performance in large scale [1, 2]. The aim of the study is to evaluate the efficiency of alum and ferric chloride coagulants for wastewater treatment of textile factories. For this purpose, the effect of pH and concentration of coagulants was investigated. For this study, the coagulant aluminum sulfate (alum) (Al2(SO4)3) and ferric chloride (FeCl3) for color Crepe-Naz textile wastewater treatment plants by measuring of color, chemical oxygen demand (COD), biochemical oxygen demand (BOD), total suspended solids (TSS) and pH were used. pH values tested for the selection of optimal pH were 4, 5, 6, 7, 8 and 9 and in this study a total of 240 samples according to standard methods for water and wastewater treatment experiments were analyzed [3]. The results showed that ferric chloride coagulant for removal of TSS, COD and color compared to alum has higher efficiency, so that maximum removal of COD, and color by alum 36, 19 and 68.8% respectively, while this amount by ferric chloride is 72, 60 and 98%, respectively. The optimum pH for alum and ferric chloride coagulants, respectively 7 and 5 were obtained. The result of this study with conducted study by Joneidi and Azizi [2] was coordinated so that, in the study, ferric chloride than alum has better efficiency in removal of dye has shown. Based on the results, it can be concluded that ferric chloride coagulant for the removal of COD, TSS and color of textile wastewater compared to alum has been effective and therefore in identical conditions, its application is more preferable compared to alum.

The use of constructed wetland for dye-rich textile wastewater treatment

Textile manufacturing is a multi-stage operation process that produces significant amounts of highly toxic wastewater. Given the size of the global textile market and its environmental impact, the development of effective, economical, and easy-to handle alternative treatment technologies for textile wastewater is of significant interest. Based on the analysis of peer-reviewed publications over the last two decades, this paper provides a comprehensive review of advanced oxidation processes (AOPs) on textile wastewater treatment, including their performances, mechanisms, advantages, disadvantages, influencing factors, and electrical energy per order (EEO) requirements. Fenton-based AOPs show the lowest median EEO value of 0.98 kWh m−3 order−1, followed by photochemical (3.20 kWh m−3 order−1), ozonation (3.34 kWh m−3 order−1), electrochemical (29.5 kWh m−3 order−1), photocatalysis (91 kWh m−3 order−1), and ultrasound (971.45 kWh m−3 order−1). The Fenton process can treat textile effluent at the lowest possible cost due to the minimal energy input and low reagent cost, while Ultrasound-based AOPs show the lowest electrical efficiency due to the high energy consumption. Further, to explore the applicability of these methods, available results from a full-scale implementation of the enhanced Fenton technology at a textile mill wastewater treatment plant (WWTP) are discussed. The WWTP operates at an estimated cost of CNY ¥1.62 m−3 (USD $0.23 m−3) with effluent meeting the China Grade I-A pollutant discharge standard for municipal WWTPs, indicating that the enhanced Fenton technology is efficient and cost-effective in industrial treatment for textile effluent.

Cationic tamarind kernel polysaccharide (Cat TKP): A novel polymeric flocculant for the treatment of textile industry wastewater

Treatment of Pre-treated Textile Wastewater using Moving Bed Bio-film Reactor

Novel pebble bed photocatalytic reactor for solar treatment of textile wastewater

This research aims at evaluating the optimization of the Fenton process in the treatment of textile wastewater under industrial conditions, by analyzing the removal of COD organic load resulting from such treatment. The methodology used in the research was of the applied type, quantitative approach, experimental design. The sampling of wastewater was carried out from the dyeing process of the textile industry. For the physicochemical characterization of wastewater from the textile industry, the parameters of pH, Temperature, Conductivity, Turbidity, Total Suspended Solids (TSS), Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (BOD5 ) were measured. The determination of the dimensions that influence the Fenton process during the treatment of wastewater from the textile industry, was carried out through the interaction of the 4 dimensions with their respective levels, which are: pH (2.5 and 3.0), metabisulfite sodium Na2 S2 O5 (1.0 and 1.5 g/L), ferrous sulfate heptahydrate FeSO4 .7H2 O (1.0 and 1.5 g/L) and H2 O2 (1.0 and 2.0 mL/L). The final COD result obtained is 374.00 mg/L, which means 83% elimination of organic load; with the following optimal working conditions, pH equal to 3.0, Na2 S2 O5 dose of 1.0 g/L, FeSO4 .7H2 O dose of 1.0 g/L and H2 O2 dose equal to 2.0 mL/L. The main conclusion is that with the application of the Fenton process as a treatment of wastewater from a textile industry and working under the optimal conditions already indicated, a higher percentage of organic load removal is obtained, complying so with the VMA (Values Maximum allowable) according to D.S. No. 010-2019 of the Peruvian Ministry of Housing, Construction and Sanitation.

Kinetic analysis of treatment of textile wastewater in hybrid column upflow anaerobic fixed bed reactor