scholarly journals Photo-Fenton like Catalyst System: Activated Carbon/CoFe2O4 Nanocomposite for Reactive Dye Removal from Textile Wastewater

2019 ◽  
Vol 9 (5) ◽  
pp. 963 ◽  
Author(s):  
Mohammad Heidari ◽  
Rajender Varma ◽  
Mohammad Ahmadian ◽  
Mohsen Pourkhosravani ◽  
Seyedeh Asadzadeh ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Reaction Time ◽  
Textile Industry ◽  
Uv Light ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Catalyst System ◽  
Reactive Dye ◽  
Ambient Room Temperature ◽  
Earth Abundant

The removal of dye from textile industry wastewater using a photo-Fenton like catalyst system was investigated wherein the removal efficiency of phenol and chemical oxygen demand (COD) was studied by varying various parameters of pH (3–11), reaction time (1–50 min), activated Carbon/CoFe2O4 (AC/CFO) nanocomposite dosage (0.1–0.9 g/L), and persulfate amount (1–9 mM/L). The highest removal rates of reactive red 198 and COD were found to be 100% and 98%, respectively, for real wastewater under the optimal conditions of pH = 6.5, AC/CFO nanocomposite dosage (0.3 g/L), reaction time, 25 min, and persulfate dose of 5 mM/L up on constant UV light irradiation (30 W) at ambient room temperature. The result showed that this system is a viable and highly efficient remediation protocol relative to other advanced oxidation processes; inexpensive nature, the ease of operation, use of earth-abundant materials, and reusability for removal of organic pollutants being the salient attributes.

scholarly journals Study on Chromaticity Removal from Mineral Processing Wastewater with Salicylic Hydroxamic Acid by Granular Activated Carbon Catalyzed Ozonation

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 359
Author(s):  
Liping Zhang ◽  
Shengnian Wu ◽  
Nan Zhang ◽  
Ruihan Yao ◽  
Eryong Wu
Keyword(s):  
Activated Carbon ◽  
Reaction Time ◽  
Hydroxamic Acid ◽  
Ph Value ◽  
Oxygen Demand ◽  
Granular Activated Carbon ◽  
Mineral Processing ◽  
Ultraviolet Absorption Spectrum ◽  
Experimental Conditions ◽  
Removal Ratio

Salicylic hydroxamic acid is a novel flotation reagent used in mineral processing. However, it impacts the flotation wastewater leaving behind high chromaticity which limits its reuse and affects discharge for mining enterprises. This study researched ozonation catalyzed by the granular activated carbon (GAC) method to treat the chromaticity of the simulated mineral processing wastewater with salicylic hydroxamic acid. The effects of pH value, ozone (O3) concentration, GAC dosage, and reaction time on chromaticity and chemical oxygen demand (CODCr) removal were discussed. The results of individual ozonation experiments showed that the chromaticity removal ratio reached 79% and the effluent chromaticity exceeded the requirement of reuse and discharge when the optimal experimental conditions were pH value 3, ozone concentration 6 mg/L, and reaction time 40 min. The orthogonal experimental results of catalytic ozonation with GAC on chromaticity removal explained that the chromaticity removal ratio could reach 96.36% and the chromaticity of effluent was only 20 when the optimal level of experimental parameters was pH value 2.87, O3 concentration 6 mg/L, GAC dosage 0.06 g/L, reaction time 60 min respectively. The degradation pathway of salicylic hydroxamic acid by ozonation was also considered based on an analysis with ultraviolet absorption spectrum and high-performance liquid chromatography (HPLC).

scholarly journals Removal of Dye and COD from Textile Wastewater Using AOP (UV/O3, UV/H2O2, O3/H2O2 and UV/H2O2/O3)

2018 ◽  
pp. 621-629 ◽  
Author(s):  
Mehrangiz Pourgholi ◽  
Reza Masoomi Jahandizi ◽  
Mohammadbagher Miranzadeh ◽  
Ommolbanin Hassan Beigi ◽  
Samaneh Dehghan
Keyword(s):  
Textile Industry ◽  
Dye Removal ◽  
Treatment Time ◽  
Reaction Times ◽  
Oxygen Demand ◽  
Advanced Oxidation ◽  
Textile Wastewater ◽  
Time Duration ◽  
Batch System ◽  
Industry Effluent

Introduction: Textile industry effluent is a complex sewage with chemical and color materials that is discharged into the environment and can cause serious problems. In this way using advanced oxidation methods and finding the best methods for removing color materials is necessary. An experimental method was done on Kashan textile industry effluent in laboratory scale and batch system. Material and Methods: Initially, optimal condition was obtained for O3 and H2O2 and followed by advanced oxidation methods (UV/O3, UV/H2O2, O3/H2O2 and UV/H2O2/O3) in different reaction times and pH on dye removal and COD (chemical oxygen demand) were determined. The results were compared with complex repetition method. Results: The results of this research showed that dye removal impact and COD based on the type of process and reaction time in UV/H2O2/O3 by 30 minute time duration, was the most effective method. UV/H2O2 in 10 minute time duration was the least effective method. COD and color removal, based on the process in UV/H2O2/O3 and pH = 6 was the most effective. The effect of UV/H2O2 and pH = 4 was the least efficient method on dye material removing. Results showed that the treatment time was effective on color removing (P < 0/001) statistically. Conclusion: It can be concluded that UV/H2O2/O3 was the most efficient on color removing process, compared to the others, due to co-incidence presence of strongly numerous oxidants and their aggravating effect through producing active hydroxyl radicals (OH˚).

scholarly journals Adsorption Characteristics of Banana Peel in the Removal of Dyes from Textile Effluent

Textiles ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 361-375
Author(s):  
Maimuna Akter ◽  
Fahim Bin Abdur Rahman ◽  
M. Zainal Abedin ◽  
S M Fijul Kabir
Keyword(s):  
Textile Industry ◽  
Dye Adsorption ◽  
Textile Wastewater ◽  
Reactive Dye ◽  
Textile Effluent ◽  
Polluted Water ◽  
Banana Peel ◽  
Adsorption Parameters ◽  
Actual Wastewater ◽  
Isotherm And Kinetic Models

Disposal of reactive dye contaminants in surface waters causes serious health risks to the aquatic living bodies and populations adjacent to the polluted water sources. This study investigated the applicability of banana peels to remediate water contamination with reactive dyes used in the textile industry. A set of batch experiments was conducted using a standard dye solution to determine optimum adsorption parameters, and these parameters were used for the removal of dyes from actual wastewater. Fitting experimental data into the isotherm and kinetic models suggested monolayer dye adsorption with chemisorption rate-limiting step. The maximum adsorption found from modeling results was 28.8 mg/g. Fourier transformed infrared (FTIR) spectra revealed the existence of hydroxyl, amine and carboxylic groups, contributing to high adsorption of dye molecules onto the adsorbent surface. About 93% of the dyes from the standard solution were removed at optimum conditions (pH—7.0, initial dye concentration—100 mg/L, contact time—60 min, and adsorbent dose—0.5 g) while this value was 84.2% for industrial textile wastewater. This difference was mainly attributed to the composition difference between the solutions. However, the removal efficiency for actual wastewater is still significant, indicating the high potentiality of banana peel removing dyes from textile effluent. Furthermore, desorption studies showed about 95% of banana peel can be recovered with simple acid-base treatment.

scholarly journals Treatment of Textile Wastewater by CAS, MBR, and MBBR: A Comparative Study from Technical, Economic, and Environmental Perspectives

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1306
Author(s):  
Xuefei Yang ◽  
Víctor López-Grimau ◽  
Mercedes Vilaseca ◽  
Martí Crespi
Keyword(s):  
Textile Industry ◽  
Water Reuse ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Economic Benefits ◽  
Biofilm Reactor ◽  
Efficient Technology ◽  
Conventional Activated Sludge ◽  
Large Water ◽  
Dyed Fabrics

In this study, three different biological methods—a conventional activated sludge (CAS) system, membrane bioreactor (MBR), and moving bed biofilm reactor (MBBR)—were investigated to treat textile wastewater from a local industry. The results showed that technically, MBR was the most 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 compared with CAS (82% vs. 83%) with halved HRT (1 day vs. 2 days) and 73% of TSS removed, while CAS had 66%. Economically, MBBR was a more attractive option for an industrial-scale plant since it saved 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 MBR processes in the life cycle assessment (LCA) study, since it reduced the consumption of electricity and 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 the textile 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.

Efficiency of the Coagulation-Flocculation Method for the Treatment of Dye Mixtures Containing Disperse and Reactive Dye

2007 ◽  
Vol 42 (1) ◽  
pp. 54-62 ◽  
Author(s):  
Pei Wen Wong ◽  
Tjoon Tow Teng ◽  
Nik Abdul Rahman Nik Norulaini
Keyword(s):  
Oxygen Demand ◽  
Textile Wastewater ◽  
Reactive Dye ◽  
Settling Time ◽  
Test Method ◽  
Colour Removal ◽  
Cod Reduction ◽  
Jar Test ◽  
Wastewater Samples ◽  
Ph Range

Abstract The coagulation-flocculation method was used to treat aqueous solutions containing varying ratios of commercial disperse and reactive dyes. The effectiveness of this method was assessed using such coagulants as alum, polyaluminium chloride (PACl) and MgCl2, and an anionic coagulant aid. The jar test method was used to measure the effects of pH and coagulant type and dosage on colour removal and chemical oxygen demand (COD) reduction. The effect of coagulant aid on floc settling time was also measured. The results showed that the coagulant dosage needed to achieve optimum colour removal and COD reduction increased as the percentage of reactive dye in the mixture increased. Alum and PACl performed effectively in a lower pH range (pH 3.8 to 5.2), whereas MgCl2 performed effectively in a higher pH range (pH 10.4 to 10.9). PACl was more effective than MgCl2 and alum, achieving &gt;99% colour removal and 96.3% COD reduction using a smaller quantity of the coagulant. The addition of coagulant aid improved floc settling time. These results show that PACl is more effective than MgCl2 and alum in removing both colour and COD in the treatment of the industrial textile wastewater samples.

scholarly journals Experimental Investigation of Chlorella vulgaris and Enterobacter sp. MN17 for Decolorization and Removal of Heavy Metals from Textile Wastewater

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3034
Author(s):  
Muhammad Mubashar ◽  
Muhammad Naveed ◽  
Adnan Mustafa ◽  
Sobia Ashraf ◽  
Khurram Shehzad Baig ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Chlorella Vulgaris ◽  
Textile Industry ◽  
Oxygen Demand ◽  
Industrial Effluents ◽  
Textile Wastewater ◽  
Removal Of Heavy Metals ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Coloring Agents

The present study evaluated the performance of microalgae Chlorella vulgaris in an Enterobacter sp. MN17-assisted textile industry wastewater treatment system for decolorization, removal of heavy metals (Cu, Cr, Pb, and Cd), and chemical oxygen demand (COD). Different dilutions (5, 10, and 20%) of wastewater were prepared to decrease the pollutant toxicity for culturing microalgae and bacteria. Reduction of color, COD, and metal contents by microalgal treatment of wastewater varied greatly, while removal efficiency (RE) was significantly enhanced when endophytic bacterial strain MN17 inoculum was applied. Most notable, results were found at a 5% dilution level by Enterobacter sp. MN17-inoculated C. vulgaris medium, as chromium (Cr), cadmium (Cd), copper (Cu), and lead (Pb) concentrations were decreased from 1.32 to 0.27 mg L−1 (79% decrease), 0.79–0.14 mg L−1 (93% decrease), 1.33–0.36 mg L−1 (72% decrease), and 1.2–0.25 mg L−1 (79% decrease), respectively. The values of COD and color were also significantly decreased by 74% and 70%, respectively, by a C. vulgaris–Enterobacter sp. MN17 consortium. The present investigation revealed that bacterial inoculation of microalgae significantly enhanced the removal of coloring agents and heavy metals from textile wastewater by stimulating the growth of algal biomass. This study manifested the usefulness of microalgae–bacterial mutualism for the remediation of heavy metals, COD, and color in industrial effluents. Microalgae consortia with growth promoting bacteria could be a breakthrough for better bioremediation and bioprocess economy. Thus, further studies are needed for successful integration of microalgae–plant growth promoting bacterial (PGPB) consortium for wastewater treatments.

Use of submerged anaerobic membrane bioreactor (SAMBR) containing powdered activated carbon (PAC) for the treatment of textile effluents

2012 ◽  
Vol 65 (9) ◽  
pp. 1540-1547 ◽  
Author(s):  
B. E. L. Baêta ◽  
R. L. Ramos ◽  
D. R. S. Lima ◽  
S. F. Aquino
Keyword(s):  
Activated Carbon ◽  
Membrane Bioreactor ◽  
Volatile Fatty Acids ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Membrane Bioreactors ◽  
Powdered Activated Carbon ◽  
Excellent Performance ◽  
Reactor Stability ◽  
Anaerobic Membrane Bioreactors

This work investigated the use of submerged anaerobic membrane bioreactors (SAMBRs) in the presence and absence of powdered activated carbon (PAC) for the treatment of genuine textile wastewater. The reactors were operated at 35 °C with an HRT of 24 h and the textile effluent was diluted (1:10) with nutrient solution containing yeast extract as the source of the redox mediation riboflavin. The results showed that although both SAMBRs exhibited an excellent performance, the presence of PAC inside SAMBR-1 enhanced reactor stability and removal efficiency of chemical oxygen demand (COD), volatile fatty acids (VFA), turbidity and color. The median removal efficiencies of COD and color in SAMBR-1 were, 90 and 94% respectively; whereas for SAMBR-2 (without PAC) these values were 79 and 86%, In addition, the median values of turbidity and VFA were 8 NTU and 8 mg/L for SAMBR-1 and 14 NTU and 26 mg/L for SAMBR-2, indicating that the presence of PAC inside SAMBR-1 led to the production of an anaerobic effluent of high quality regarding such parameters.

Removal of Dyes from the Textile Industry by Adsorption in Fixed Bed Columns: A Sustainable Process

2009 ◽  
Vol 4 (4) ◽  
Author(s):  
Andressa Regina Vasques ◽  
Selene Maria Arruda Guelli Ulson de Souza ◽  
José Alexandre Borges Valle ◽  
Antônio Augusto Ulson de Souza
Keyword(s):  
Textile Industry ◽  
Fixed Bed ◽  
Dye Adsorption ◽  
Textile Wastewater ◽  
Reactive Dye ◽  
Breakthrough Curves ◽  
Maximum Adsorption Capacity ◽  
Fixed Bed Adsorption ◽  
Different Temperatures ◽  
Textile Wastewater Treatment

The capacity and mechanism of mono and bi-functional reactive dye adsorption utilizing a new adsorbent obtained from the dried residual sludge (~10% w.w.) of a textile wastewater treatment system was studied. With the focus on determining the efficiency of the adsorbent in the dye removal, the adsorption isotherms were determined for the reactive dyes RR2 and RR141, at different temperatures and salt concentrations. The experiments were carried out in fixed bed adsorption columns, which were defined as the best adsorption experimental condition for both of the dyes through the parameter qm (mg/g), obtained by the adjustment of Langmuir isotherms. Breakthrough curves for the dyes RR2 and RR141 were obtained varying the height to which the fixed bed columns were packed with adsorbent (15, 30 and 45 cm) and varying the adsorbate feed rate in the column (8, 12 and 16 ml/min). For the dye RR2 the maximum adsorption capacity was 53.48 mg/g and for the dye RR141 it was 78.74 mg/g.

scholarly journals Kinetics of COD and Dye Removal for Waste Water from Textile Industry

2021 ◽  
Vol 9 (9) ◽  
pp. 237-244
Author(s):  
Heena Rani Bindala
Keyword(s):  
Waste Water ◽  
Water Pollution ◽  
Activated Carbon ◽  
Textile Industry ◽  
Dye Removal ◽  
Textile Wastewater ◽  
Electrochemical Treatment ◽  
Efficient Treatment ◽  
Treatment Technologies ◽  
Kinetics Of

Abstract: Water pollution poses serious threats to both the environment and the organisms that depend on their environment for survival. Due to the toxicity from dyes in textile wastewater, there is a dire need for the development of innovative and efficient treatment technologies. In this study treatability studies, using a electrochemical treatment (ECT) method followed by activated carbon (AC) based adsorption. ECT method was studied extensively for the treatment of reactive black dye. Moreover, to understand the practical applicability of ECTs, the findings were optimized for treatment of synthetic textile wastewater (STW).

scholarly journals TREATMENT OF RUBBER INDUSTRY WASTEWATER BY USING FENTON REAGENT AND ACTIVATED CARBON

2017 ◽  
Vol 79 (7-2) ◽  
Author(s):  
Tuty Emilia Agustina ◽  
Elon Jefri Sirait ◽  
Herman Silalahi
Keyword(s):  
Activated Carbon ◽  
Reaction Time ◽  
Oxygen Demand ◽  
Quality Standard ◽  
Molar Ratio ◽  
Fenton Reagent ◽  
Activated Carbon Adsorption ◽  
Rubber Industry ◽  
Rubber Wastewater ◽  
The Impact

Rubber industries are sufficiently developed and widely spread countryside as well as in some big cities in Indonesia. An Increasing number of rubber industries have also increased rubber wastewater. However, the rubber industry development should pay attention to the impact on the environment. The rubber wastewater is problematic, because of high Chemical Oxygen Demand (COD) content. So far, the methods that have been used to remove COD in the waste water have been proven to be costly and time consuming. The research objective is to treat the rubber wastewater by using a combination of Fenton reagent and activated carbon adsorption. In this study, effect of molar ratios of Fenton reagent, pH, and reaction time on COD degradation were studied. After treating with Fenton reagent, the wastewater was passed into an adsorption column of 20 cm height of activated carbon granules. The maximum COD degradation of 95% were found by using a combination of Fenton reagent and activated carbon, with a molar ratio of reagent Fenton 1:250 and a reaction time of 45 minutes. The final COD of 71 mg/l, TSS of 70 mg/l, and pH of 7.8 were found which fulfilled the environmental quality standard regulation for industrial wastewater in Indonesia. 

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