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>

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.

scholarly journals Textile Wastewater Treatment on a Spinning Disc Reactor: Characteristics, Performances, and Empirical Modeling

2020 ◽  
Vol 10 (23) ◽  
pp. 8687
Author(s):  
Eugenia Teodora Iacob Tudose ◽  
Carmen Zaharia
Keyword(s):  
Wastewater Treatment ◽  
Suspended Solids ◽  
Operating Time ◽  
Textile Wastewater ◽  
Empirical Modeling ◽  
Effluent Treatment ◽  
Suitable Alternative ◽  
Additional Processing ◽  
Textile Wastewater Treatment ◽  
Spinning Disc

Spinning disc (SD) technology has been successfully applied, for the first time, in real textile wastewater treatment with no other additional processing. The SD efficiency was investigated using real textile effluents to study the color and suspended solids removals at different effluent-supplying flowrates (10–30 L/h) and different disc rotational speeds (100–1500 rpm) with good experimental results; thus, it can minimize the polluting loads within a short time period. Furthermore, within this study, process modeling and its classical optimization were applied to SD technology for wastewater treatment. The experiments were organized according to an active central composite rotatable 23 order design, considering as independent variables the wastewater flowrate, rotational speed, and operating time and, as optimization criteria, the suspended solids removal and discoloration degree. Overall, this novel study proved that the SD technology applied in textile effluent treatment is a suitable alternative to a primary mechanical step.

scholarly journals Combined electrocoagulation and electro-oxidation of industrial textile wastewater treatment in a continuous multi-stage reactor

2017 ◽  
Vol 76 (9) ◽  
pp. 2515-2525 ◽  
Author(s):  
Edison GilPavas ◽  
Paula Arbeláez-Castaño ◽  
José Medina ◽  
Diego A. Acosta
Keyword(s):  
Wastewater Treatment ◽  
Current Density ◽  
Design Of Experiment ◽  
Operating Cost ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Fractional Factorial ◽  
Multi Stage ◽  
Electro Oxidation ◽  
Textile Wastewater Treatment

Abstract A combined electrocoagulation (EC) and electrochemical oxidation (EO) industrial textile wastewater treatment potential is evaluated in this work. A fractional factorial design of experiment showed that EC current density, followed by pH, were the most significant factors. Conductivity and number of electrooxidation cells did not affect chemical oxygen demand degradation (DCOD). Aluminum and iron anodes performed similarly as sacrificial anodes. Current density, pH and conductivity were chosen for a Box–Behnken design of experiment to determine optimal conditions to achieve a high DCOD minimizing operating cost (OC). The optimum to achieve a 70% DCOD with an OC of USD 1.47/m3 was: pH of 4, a conductivity of 3.7 mS/cm and a current density of 4.1 mA/cm2. This study also shows the applicability of a combined EC/EO treatment process of a real complex industrial wastewater.

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 Development and performance of BAC-ZS bacterial consortium as biofilm onto macrocomposites for raw textile wastewater treatment

2018 ◽  
Vol 14 (2) ◽  
pp. 257-262
Author(s):  
Mohd Fahmi Muhammad Mubarak ◽  
Muhamad Hanif Md Nor ◽  
Muhamad Firdaus Sabaruddin ◽  
Hui Han Bay ◽  
Chi Kim Lim ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Mixed Culture ◽  
Oxygen Demand ◽  
Aerobic Condition ◽  
Textile Wastewater ◽  
Bacterial Consortium ◽  
Cod Removal ◽  
Time Duration ◽  
Textile Wastewater Treatment ◽  
Biofilm Development

One of the most abundant dyes that are used extensively in the textile manufacturing are azo dyes, which may endanger water bodies since incomplete breakdown of dyes may cause mutagenic and carcinogenic compounds to persist. In this study, BAC-ZS, bacterial mixed culture consisting of three acclimatised decolourising bacteria were grown as biofilm onto macrocomposites. Different time duration between 3 to 14 days of biofilm development was studied to determine the density of biofilm attached onto macrocomposites. Sequencing batch reactors (SBRs) were set up for raw textile wastewater treatment to investigate the effectiveness of the treatment with and without the presence of biofilm (control). The treatment was performed under facultative anaerobic-aerobic condition for 20 days continuously with 48-hour of hydraulic retention time (HRT) cycle (consisting both conditions). Colour and chemical oxygen demand (COD) were monitored throughout the treatment process. Results showed that the colour and COD removal by the developed biofilm were 78.6 ± 1.4% and 76.4 ± 1.12% from initial values of 1400 ADMI and 660 mg/L, respectively while only 47.9 ± 0.9% colour and 38.0 ± 1.5% COD removal for the control. In conclusion, the biofilm of BAC-ZS mixed culture coated onto macrocomposites showed potential applications in the treatment of raw textile wastewater.

scholarly journals Direct contact membrane distillation for textile wastewater treatment: a state of the art review

2017 ◽  
Vol 76 (10) ◽  
pp. 2565-2579 ◽  
Author(s):  
Heloisa Ramlow ◽  
Ricardo Antonio Francisco Machado ◽  
Cintia Marangoni
Keyword(s):  
Wastewater Treatment ◽  
Water Reuse ◽  
Direct Contact ◽  
State Of The Art ◽  
Textile Wastewater ◽  
Membrane Distillation ◽  
Operating Conditions ◽  
Successful Implementation ◽  
Direct Contact Membrane Distillation ◽  
Textile Wastewater Treatment

Abstract To meet surging water demands, water reuse is being sought as an alternative to traditional water resources. Direct contact membrane distillation (DCMD) has been increasingly studied in the past decade for its potential as an emerging cost effective wastewater treatment process and subsequent water reuse. This review presents a comprehensive overview of the current progress in the application of DCMD for textile wastewater treatment based on the available state of the art. There are already published review papers about the membrane distillation process, but the difference in the present work is that it focuses on the textile area, which consumes a lot of water and generates large amounts of wastewater, and still needs innovations in the sector. A review focused on the textile sector draws the attention of professionals to the problem and, consequently, to a solution. Current issues such as the influences of feed solution, membrane characteristics and membrane fouling and new insights are discussed. The main performance operating conditions and their effects on the separation process are given. Likewise, challenges associated with the influence of different dyes on the DCMD results are explained. This review also highlights the future research directions for DCMD to achieve successful implementation in the textile industry.

Valorization of the Vicia faba mucilage on textile wastewater treatment as a bio-flocculant: process development and optimization using response surface methodology (RSM)

2016 ◽  
Vol 75 (3) ◽  
pp. 629-642 ◽  
Author(s):  
Feriel Bouatay ◽  
Nesrine Eljebsi ◽  
Sonia Dridi-Dhaouadi ◽  
Farouk Mhenni
Keyword(s):  
Wastewater Treatment ◽  
Vicia Faba ◽  
Suspended Solids ◽  
Process Development ◽  
Mixing Time ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Textile Wastewater ◽  
Cod Removal ◽  
Textile Wastewater Treatment

The Vicia faba membranes are an abundant and a low cost product. In the present research paper, the extracted Vicia faba mucilage was tested as an eco-friendly flocculant for textile wastewater treatment. Its performance as flocculant, in decolorization, chemical oxygen demand (COD) removal and the concentration of total suspended solids was checked. The natural extracted product was characterized using infrared spectroscopy. The total sugars were determined in the extracted product. The effect study, followed by an optimization and modeling analysis, of some experimental parameters on the coagulation–flocculation performance, using Vicia faba mucilage (as a flocculant), combined with aluminum sulfate (as a coagulant), showed that the best conditions for the flocculation process were pH of the effluent about 7, flocculant dose about 6.75 mg/L, flocculation mixing time about 3 min and flocculation mixing speed about 30 rpm, leading to a decolorization equal to 92.32%, COD removal of about 97.52% and total suspended solids of about 15.3 mg/L. A comparison study between the flocculation performance of commercial reagents and the bio-agent showed that the natural product presented a good flocculation performance.

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