scholarly journals Industrial Textile Wastewater Ozone Treatment: Catalyst Selection

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 611
Author(s):  
Lucyna Bilińska ◽  
Kazimierz Blus ◽  
Magdalena Bilińska ◽  
Marta Gmurek
Keyword(s):  
Catalytic Effect ◽  
Treatment Time ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Catalytic Ozonation ◽  
Ozone Treatment ◽  
Reactive Black 5 ◽  
Short Treatment ◽  
Extensive Discussion ◽  
Textile Wastewater Treatment

One of the recent trends in textile wastewater treatment has become catalytic ozonation. The necessity of effective color removal in a short treatment time is a standard during industrial implementation. At the same time, efficient chemical oxygen demand (COD), total organic carbon (TOC), and toxic by-product removal are highly expected. This study presents the results of a catalytic ozonation treatment. Three types of catalysts: a metal oxide (TiO2 as P25 by Degussa), activated carbon (nano-powder by Sigma, AC), and metal particles (platinum, 1% wt. supported on AC matrix by Sigma, Pt–AC) have been applied. The investigations were conducted for real industrial wastewater originated in textile dyeing with Reactive Black 5 dye (RB5). The experiments ran for the raw wastewater (without pretreatment), exposed blocking of the catalytic action by all used catalysts. The catalytic effect could be observed when catalytic ozonation was used as a polishing step after electrocoagulation (EC). Although the catalytic effect could be observe for all catalysts then, especially in the removal of colorless by-products, the AC was exposed as the most effective. This contributed to 35% and 40% of TOC and COD removal. While only 18% and 23% of TOC and COD were removed in the same process without AC. The decrease in toxicity was 30%. The results of the study revealed the complexity of the issue and resulted in an extensive discussion devoted to the basis of the catalytic activity of each catalyst.

OZONATION – AN IMPORTANT TECHNIQUE TO COMPLY WITH NEW GERMAN LAWS FOR TEXTILE WASTEWATER TREATMENT

1994 ◽  
Vol 30 (3) ◽  
pp. 255-263 ◽  
Author(s):  
Frank Gähr ◽  
Frank Hermanutz ◽  
Wilhelm Oppermann
Keyword(s):  
Wastewater Treatment ◽  
Textile Industry ◽  
High Performance ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Ozone Treatment ◽  
Partial Replacement ◽  
Textile Production ◽  
Textile Wastewater Treatment ◽  
The Ideal

The German textile industry is challenged by the introduction of new governmental regulations in the field of textile wastewater treatment This causes a large increase of water costs in comparison with other European countries. Many economic experts even see Germany seriously endangered as a place of textile production, however there are also opportunities with the development of high performance cleaning technologies as a result of these governmental measures. In particular the required separate treatment of selected wastewaters of different fmishing processes bas some good perspectives since specialized wastewater techniques can be applied efficiently. For instance the separation of unfixed reactive dyes is the ideal basis for ozone oxidation. Ozonation being a sludge-free method to decompose dyestuff, fmishing products, and other organic materials is of increasing importance because of the limited space for disposal of sludges. Other advantages of ozone treatment are the improvement of biodegradability, reduction of aromatic and halogenated organic compounds and also a significant decrease of chemical oxygen demand. The ozonation of textile wastewaters in combination with inexpensive biological processes has the potential to play a major role in the future. Partial replacement of coagulation/precipitation can be expected.

scholarly journals A prototype of textile wastewater treatment using coagulation and adsorption by Fe/Cu nanoparticles: Techno-economic and scaling-up studies

2021 ◽  
Vol 11 ◽  
pp. 184798042110411
Author(s):  
Ahmed S Mahmoud ◽  
Mohamed K Mostafa ◽  
Robert W Peters
Keyword(s):  
Oxygen Demand ◽  
Textile Wastewater ◽  
Scaling Up ◽  
Influential Factor ◽  
Prototype System ◽  
Relative Importance ◽  
Total Treatment Cost ◽  
Adsorption Models ◽  
Removal Efficiencies ◽  
Textile Wastewater Treatment

This study aims to investigate the efficiency of a pilot prototype system comprising coagulation/flocculation, filtration, and nano-bimetallic iron/copper (Fe/Cu) degradation and adsorption units for the removal of chemical oxygen demand (COD), biological oxygen demand (BOD), color, total nitrogen (TN), total phosphorus (TP), and TSS from real textile wastewater. The total removal efficiencies of the system were 96, 98, 82, 69, 88, and 97%, respectively, using 0.5 g/L ferric chlorides as a coagulant under an optimum adsorption condition of pH 6.0, nano-dosage 1.4 g/L, contact time 80 min, and stirring rate 250 r/min at room temperature. Adsorption isotherms indicated that the removal of COD and TP obeys both Koble–Corrigan and Freundlich adsorption models, removal of color obeys both Koble–Corrigan and Hill adsorption models, and removal of TN and TSS obeys Koble–Corrigan and Khan models, respectively. Avrami kinetic models adequately describe the adsorption data for COD, BOD, TN, and TSS, while pseudo-second-order and intraparticle models described the removal mechanism of color and TSS, respectively. An artificial neural network (ANN) with r2-value exceeding 0.98 is accurate and can be used with confidence in predicting removal efficiencies of the targeted parameters. Sensitivity analysis results showed that the initial concentration was the most influential parameter for TSS removal with relative importance greater than 25%, while the bimetallic Fe/Cu dosage was the most influential factor for all other studied parameters with relative importance greater than 40%. The total treatment cost of the proposed system per m3 after scaling up was found to be US$4.5 for reuse of the treated water for the irrigation of forest trees.

Application of Persulfate in Textile Wastewater Treatment

2019 ◽  
pp. 70-98
Author(s):  
Fagbenro Oluwakemi Kehinde ◽  
Salem S. Abu Amr ◽  
Hamidi Abdul Aziz
Keyword(s):  
Wastewater Treatment ◽  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Primary Objective ◽  
Biological Oxidation ◽  
Healthy Environment ◽  
Clean Environment ◽  
Textile Dyeing ◽  
Textile Wastewater Treatment

As textile and dyeing industries increase, pollution due to effluent discharges from the same industries also increase and become of great concern to a healthy environment. In an attempt to understand the generation and treatment of textile wastewater, this chapter discusses the processes from which textiles are made, items of importance that are used in the production process which may account for the characteristics of the wastewater and persulfate, applied in the treatment of textile wastewater. Although these wastewaters are generally characterized by color, fluctuating pH, heat, salts, suspended solids (SS), the presence of metal ions, biological oxidation demand (BOD), and chemical oxygen demand (COD), color is the most obvious. The presence of color in the effluents from textile dyeing and finishing is due to the inefficient dyeing processes, resulting in unfixed forms of the dyestuff. To achieve the primary objective of obtaining a clean environment, there is a need for continuous monitoring of textile wastewater discharges, of which major concern is color.

The influence of reaction conditions in the oxidation of organic compounds of nuclear laundry water by ozone

2010 ◽  
Vol 61 (10) ◽  
pp. 2557-2561 ◽  
Author(s):  
M. K. Vilve ◽  
M. E. T. Sillanpää
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Carbon ◽  
Chemical Oxygen Demand ◽  
Organic Compounds ◽  
Biochemical Oxygen Demand ◽  
Treatment Time ◽  
Oxygen Demand ◽  
Ozone Treatment ◽  
Reaction Conditions ◽  
Oxidation Of Organic Compounds

This paper presents a summary of degrading organic compounds of nuclear laundry water by ozonation in different conditions of pH, hydrogen peroxide and ultraviolet radiation. The degradation of organic compounds was analysed by chemical oxygen demand (COD), total organic carbon (TOC) and biochemical oxygen demand (BOD). The optimal degradation conditions were at pH 7 with ozone, UV radiation and hydrogen peroxide addition. The transfer of ozone increased significantly, thus resulting in decreased treatment time compared to ozone treatment alone. The reductions of COD, TOC and BOD were 46%, 32% and 70%, respectively.

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 Treatment of textile wastewater using a novel electrocoagulation reactor design

2018 ◽  
Vol 20 (3) ◽  
pp. 449-457
Keyword(s):  
Wastewater Treatment ◽  
Rotation Speed ◽  
Removal Rate ◽  
Operating Time ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Total Suspended Solid ◽  
Operating Conditions ◽  
Conventional Model ◽  
Textile Wastewater Treatment

<p>This study explored the best-operating conditions for a novel electrocoagulation (EC) reactor with the rotating anode for textile wastewater treatment. The influence of operating parameters like inter-electrode distance (IED), current density (CD), temperature, pH, operating time (RT), and rotation speed on the removal efficiency of the contaminant was studied. A comparative study was done using conventional model with static electrodes in two phases under same textile wastewater The findings revealed that the optimal conditions for textile wastewater treatment were attained at RT = 10 min, CD = 4 mA/cm2, rotation speed = 150 rpm, temperature = 25oC, IED = 1cm, and pH = 4.57. The removal efficiencies of colour, biological oxygen demand (BOD), turbidity, chemical oxygen demand (COD), and total suspended solid (TSS) were 98.50%, 95.55%, 96%, 98% and 97.10% within the first 10 min of the reaction. The results of the experiment reveal that the newly designed reactor incorporated with cathode rings and rotated anode impellers provide a superior treatment efficiency within a short reaction time. The novel EC reactor with a rotating anode significantly enhanced textile wastewater treatment compared to the conventional model. The values of adsorption and passivation resistance validated the pollutants removal rate.</p>

scholarly journals Treatment of Real Textile Wastewater Using Electron Beam Irradiation

2019 ◽  
Vol 27 (2) ◽  
pp. 303-316 ◽  
Author(s):  
Nguyen Ngoc Duy ◽  
Dang Van Phu ◽  
Nguyen Thi Kim Lan ◽  
Nguyen Thanh Duoc ◽  
Nguyen Quoc Hien ◽  
...  
Keyword(s):  
Electron Beam ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Chemical Oxidation ◽  
Color Removal ◽  
Reactive Black 5 ◽  
Radiation Process ◽  
Radiation Technology ◽  
Textile Dyeing ◽  
Beam Method

Abstract Textile wastewater is known to have a large number of hazardous pollutants, intense color and high chemical oxygen demand (COD) concentration. The electron beam method is considered useful in treatment textile wastewater through chemical oxidation process. In this study, three real textile wastewaters (Sample 1: Reactive Black 5, Reactive Red 10, and Reactive Orange 13; Sample 2: Reactive Red 10 and Yellow GR; Sample 3: Reactive Black 5 and Turquoise Blue HF–G) from textile dyeing company in Ho Chi Minh city were treated by electron beam method. The effect of absorbed doses and hydrogen peroxide (H2O2) at different concentrations on the change of pH, removal capacity, COD and five day’s biological oxygen demand (BOD5) were investigated. The results indicated that color, COD, BOD5 and pH decreased with increasing absorbed dose. A sufficient amount of H2O2 in the radiation process could accelerate the color removal process. In the same condition, a color removal efficiency of ~90% was obtained with EB/H2O2, in contrast with color loss by using EB alone (~71%). These results highlighted the potential of EB radiation technology for treatment of textile dyeing wastewater.

scholarly journals Application of Ozone Treatment for the Decolorization of the Reactive-Dyed Fabrics in a Pilot-Scale Process—Optimization through Response Surface Methodology

2020 ◽  
Vol 12 (2) ◽  
pp. 471 ◽  
Author(s):  
Ajinkya Sudhir Powar ◽  
Anne Perwuelz ◽  
Nemeshwaree Behary ◽  
Levinh Hoang ◽  
Thierry Aussenac
Keyword(s):  
Mathematical Model ◽  
Textile Industry ◽  
Treatment Time ◽  
Pilot Scale ◽  
Reactive Dye ◽  
Response Surfaces ◽  
Ozone Treatment ◽  
Reactive Black 5 ◽  
Box Behnken Design ◽  
Dyed Fabrics

The decolorization of a cotton fabric dyed with a reactive dye (C.I. Reactive Black 5) was studied using an optimized ozone-assisted process at pilot scale. Box–Behnken design was used to evaluate the effects of three parameters on the decolorization of the dyed textile, namely, pH of the treatment (3–7), ozone concentration (5–85 g/m3 of ozone), and treatment time (10–50 min). The fitted mathematical model allowed us to plot response surfaces as well as isoresponse curves and to determine optimal decolorization conditions. In this study, we have proposed a pilot-scale machine which utilizes ozone for the color stripping of the dyed cotton. This pilot-scale application opens up the route for application of ozone at an industrial scale for achieving sustainability in the textile industry.

Batch Kinetics and Effects of Process Parameters for Biodegradation of Reactive Black 5 in an Aerobic Mixed Microbial Culture

2013 ◽  
Vol 10 (2) ◽  
pp. 1 ◽  
Author(s):  
Jagannathan Krishnan ◽  
Siti Rabiatul Adawiyah Ibrahim
Keyword(s):  
Process Parameters ◽  
Kinetic Studies ◽  
Textile Wastewater ◽  
Inoculum Size ◽  
Microbial Culture ◽  
Reactive Black 5 ◽  
Mixed Microbial Culture ◽  
Treatment Tank ◽  
Textile Wastewater Treatment ◽  
Degradation Properties

Mixed microbial culture used in this study was developed from sludge that was taken from local textile wastewater treatment tank. Acclimatization process was performed before starting the biodegradation experiment to obtain a microbial culture with high degradation properties. Kinetic studies by the mixed microbial culture were determined quantitatively for the model pollutant, Reactive Black 5 (RB 5). By using Michaelis-Menten model, the constants were found to be 11.15 mg l-1 h-1 and 29.18 mg l-1 for Vm and Km respectively. The values of kinetic constants for Monod model were found to be 33.11 mg l-1 cell h-1 for the maximum specific microbial growth rate, µm and 86.62 mg l-1 for Monod constant, Ks. The effects of process parameters such as pH, inoculum size and initial dye concentration on the biodegradation of azo dye, RB 5 were systematically investigated. Maximum removal efficiencies observed in this study were 75% for pH 6, 100% for 15% inoculum concentration and 75% for 20 ppm of initial dye concentration.

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