scholarly journals Assessing the current state of housing and infrastructure in the concentrated immigrant areas in Ho Chi Minh City

2016 ◽  
Vol 19 (2) ◽  
pp. 28-37
Author(s):  
Ha Bui Manh ◽  
Duy Nguyen Ngoc ◽  
Hien Nguyen Quoc
Keyword(s):  
Removal Efficiency ◽  
Ph Effect ◽  
Absorbed Dose ◽  
Textile Wastewater ◽  
Color Removal ◽  
Synthetic Wastewater ◽  
H2o2 Concentration ◽  
Radiation Technology ◽  
Current State ◽  
Initial Ph

Decolorization from synthetic wastewater containing Reactive Red 24 (RR24) using gamma Cobalt-60 ray was investigated. The influence of the irradiation dose, initial pH, initial dye and hydrogen peroxide (H2O2) concentration were evaluated. The pH effect has proved that lower decolorization efficiency was observed in alkaline medium as compared to the neutral and acid medium. While color removal efficiency increased with increasing absorbed dose. A synergistic effect of gamma radiation with H2O2 was applied and the results showed that H2O2 accelerated decolorization process, however when the dosage of H2O2 exceeded the optimal concentration, the color removal efficiency attained saturation and even reduced. The color removal efficiencies achieved over 99% at the dose of 4 kGy, initial pH 7, initial dye concentrationof 100 mg/L and H2O2 concentration of 3mM. These results highlighted the potential of radiation technology for dye removal from textile wastewater.

Removal of a Di-Azo Dye Acid Red 73 Synthetic Wastewater by Advanced Fenton Process Based on Nanoscale Zero-Valent Iron

2012 ◽  
Vol 518-523 ◽  
pp. 2718-2721
Author(s):  
Feng Lian Fu ◽  
Zhi Hong Chen ◽  
Qi Wang
Keyword(s):  
Azo Dye ◽  
Ph Value ◽  
Zero Valent Iron ◽  
Color Removal ◽  
Synthetic Wastewater ◽  
H2o2 Concentration ◽  
Fenton Process ◽  
Nanoscale Zero Valent Iron ◽  
Initial Ph ◽  
Acid Red 73

In this study, the removal of a di-azo dye, C.I. Acid Red 73 synthetic wastewater was investigated using advanced Fenton process based on nanoscale zero-valent iron (NZVI) that was synthesized by the aqueous phase borohydride reduction method in the laboratory. NZVI has been characterized by SEM. The influences of NZVI dosage, H2O2 concentration and initial pH value in the process of dye removal by advanced Fenton process were studied in a batch setting. The color removal efficiency was found to be decreased with increase of initial pH, and increased with increase of NZVI and H2O2 concentration. By using proposed process with NZVI dose of 0.02 g/L and H2O2 concentration of 1.0 mM, at 30 min the Acid Red 73 color removal was more than 90%.

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 The effect of different types of AOPs supported by hydrogen peroxide on the decolorization of methylene blue and viscose fibers dyeing wastewater

2021 ◽  
Author(s):  
Zeynep Bilici ◽  
Mohammed Saleh ◽  
Erdal Yabalak ◽  
Alireza Khataee ◽  
Nadir Dizge
Keyword(s):  
Hydrogen Peroxide ◽  
Removal Efficiency ◽  
Textile Industry ◽  
Subcritical Water ◽  
Color Removal ◽  
H2o2 Concentration ◽  
Dyeing Wastewater ◽  
Viscose Fibers ◽  
Different Types ◽  
Removal Efficiencies

Abstract Wastewater from the textile industry containing a high concentration of organic and inorganic chemicals have strong color and residual chemical oxygen demand (COD). Therefore, advanced oxidation processes (AOPs) are very good candidates to treat textile industry wastewater. In this study, we investigated the effect of different types of AOPs supported with hydrogen peroxide (H2O2) on the treatment of viscose fibers dyeing wastewater. Fenton, photo-Fenton, and Fenton supported subcritical water oxidation (FSWO) processes were chosen as AOPs to compare the treatment efficiency of viscose fibers dyeing wastewater. The effects of solution pH, Fe2+ concentration, and H2O2 concentration on the treatment of viscose fibers dyeing wastewater were tested. The maximum color and COD removal efficiency was obtained corresponding to pH 2.5 for all oxidation methods when MB dye solution was used. However, the maximum efficiencies were obtained at pH 3.0 for real textile wastewater decolorization. The MB dye removal efficiency was increased to 97.22, 100, and 100% for Fenton, photo-Fenton, and FSWO processes, respectively, when the addition of H2O2 concentration was adjusted to 125 mg/L. However, the maximum color removal efficiencies of viscose fibers dyeing wastewater were obtained 56.94, 61.26, 64.11% for Fenton, photo-Fenton, FSWO processes, respectively. As a result, the FSWO showed maximum color removal efficiencies.

Removal of Reactive Dyes by Sorption/Complexation with Cucurbituril

1999 ◽  
Vol 40 (4-5) ◽  
pp. 425-433 ◽  
Author(s):  
S. Karcher ◽  
A. Kornmüller ◽  
M. Jekel
Keyword(s):  
Wastewater Treatment ◽  
Ph Effect ◽  
Reactive Dyes ◽  
Textile Wastewater ◽  
Color Removal ◽  
Salt Solutions ◽  
Technical Application ◽  
Ph Values ◽  
Hydrophobic Cavity ◽  
Textile Wastewater Treatment

Color removal is an important task in textile wastewater treatment. Cucurbituril, a cyclic hexamer with internal hydrophobic cavity, has been studied as sorbent for removal of reactive dyes. Loadings as high as 1 g/g and more were obtained, making the method seem interesting for technical application. A minimum of 1 to 5 mmol/L calcium is needed for efficient sorption. However, salt concentrations of 100 mmol/L and above decrease sorption efficiency due to increased solubility of cucurbituril in salt solutions. The pH has little influence between 4 and 7.5, higher pH-values can result in decreased sorption. The salt influences are similar for most of the tested dyes whereas the pH-effect differs from dye to dye.

Decolorization of Reactive Brilliant Red X-3B Simulated Dye Water by Novel Coagulants

2013 ◽  
Vol 743-744 ◽  
pp. 665-668
Author(s):  
Ji Zhou Li ◽  
Xu Yin Yuan ◽  
Ming Tian ◽  
Hao Ran Ji ◽  
Wan Jiang
Keyword(s):  
Removal Efficiency ◽  
Dye Removal ◽  
Color Removal ◽  
Solution Temperature ◽  
Maximum Efficiency ◽  
Coagulant Dosage ◽  
Decolorization Efficiency ◽  
Initial Ph ◽  
Simulated Wastewater ◽  
Ph Range

Five novel coagulants, DC-491, Fennofix K97, BWD-01, MD-03 and MD-04 were chosen to treat reactive brilliant red X-3B simulated wastewater by jar tests. The results showed that the decolorization efficiencies were all higher than 75% at initial pH 8.2 and temperature 20 after 20 minutes of reaction. Then, two typical coagulants, BWD-01 and MD-04 which had better performance were chosen to study the effect of dye removal of X-3B at different operating parameters, including coagulant dosage, pH, sedimentaion time and reaction temperature of simulated wastewater. Decolorization efficiency of MD-04 for X-3B solution was higher than 80% in pH range from 3 to 9, while for BWD-01, efficiency increased from 37.3% to 82.3% in this pH range. For both BWD-01 and MD-04, the color removal efficiency increased as the solution temperature increased and the maximum efficiency was over 94% at 40. Small changes in the color removal efficiency were observed after 1 hour sedimentation for both coagulants.

scholarly journals Electrocoagulation of textile wastewater containing a mixture of organic dyes by iron electrode

2017 ◽  
Vol 7 (2) ◽  
pp. 103 ◽  
Author(s):  
Borislav N. Malinović ◽  
Miomir G. Pavlović ◽  
Tijana Djuričić
Keyword(s):  
Removal Efficiency ◽  
Organic Dyes ◽  
Supporting Electrolyte ◽  
Specific Energy Consumption ◽  
Oxygen Demand ◽  
Color Removal ◽  
Iron Electrode ◽  
Synthetic Wastewater ◽  
Initial Concentration ◽  
The Impact

This study focused on testing the efficacy of iron (Fe) electrode in an electrochemical treatment (electrocoagulation) of wastewater containing a mixture of organic dyes. The mixture consists of the following azo dyes: Acid Black 194, Acid Black 107 and Acid Yellow 116. The present organic dyes are toxic, cause skin and eye irritation and are extremely dangerous to aquatic organisms. The study was conducted on a synthetic wastewater prepared in a laboratory electrochemical reactor. During the research, the impact of the current density, various concentrations of dye and supporting electrolyte, electrolysis duration and <em>pulsed current regime </em><em>were tracked</em>. The results are shown through color removal efficiency, chemical oxygen demand (COD) removal efficiency, current efficiency, and specific energy consumption. At the initial concentration of dye (γ=200 mg/L) and concentration of supporting electrolyte (γ<sub>NaCl</sub>=1 g/L) the color removal efficiency of 80.64% was achieved for 420 seconds of treatment (ј=10 mA/cm<sup>2</sup>). At the initial concentration of dye (γ=50 mg/L) and γ<sub>NaCl</sub>= 8 g/L, the color removal efficiency of 96.01% was attained for 300 seconds of treatment (ј=10 mA/cm<sup>2</sup>)

scholarly journals Textile Dye Reactive Black 5 (RB5) Bio-Sorption with Moving Bed BiofilmReactor and Activated Sludge

2021 ◽  
Vol 5 (2) ◽  
Author(s):  
I Wayan Koko Suryawan ◽  
Qomarudin Helmy ◽  
Suprihanto Notodarmojo ◽  
Riska Pratiwi ◽  
Iva Yenis Septiariva
Keyword(s):  
Activated Sludge ◽  
Removal Efficiency ◽  
Treatment Process ◽  
Waste Treatment ◽  
Textile Wastewater ◽  
Color Removal ◽  
Textile Dye ◽  
Reactive Black 5 ◽  
Desorption Process ◽  
Pre Treatment

Reactive Black 5 (RB5) is one of the dyes used in textile industries in Indonesia. However, the high color content can interferewith the condition of water bodies if not treated. This waste treatment process is usually treated with biological treatmentprocesses. Biological processing often used is the MBBR unit and activated sludge. This study aims to determine the RB5dye’s bio-sorption efficiency using MBBR processing and activated sludge. MBBR processing and activated sludge consistof seeding, acclimatization, and running stages. This research was carried out using a real textile wastewater approach byadding 100 mg/L RB5 and adding 1000 mg/L starch solution. The processing results of the seeding stage indicate increasingin biomass. The acclimatization stage with 50% and 75% of wastewater indicates increased biomass and color removal.The RB5 color removal efficiency results in the MBBR unit and activated sludge show 41% and 84% values. The MBBRprocessing shows fluctuations each time where the desorption process occurs in the color removal. For this reason, the ozonepre-treatment process is conducted in the MBBR unit. The integrated pre-treatment with MBBR results show the samefluctuation as the previous processing with a color removal efficiency of 43% with a color removal efficiency of 43%.

scholarly journals Chromium and cadmium removal from synthetic wastewater by Electrocoagulation process

2020 ◽  
Vol 9 (2) ◽  
pp. 375-382
Keyword(s):  
Removal Efficiency ◽  
Current Density ◽  
Initial Temperature ◽  
Complete Removal ◽  
Synthetic Wastewater ◽  
Cadmium Removal ◽  
Solution Ph ◽  
Initial Concentration ◽  
Initial Ph ◽  
Electrocoagulation Process

Electrocoagulation (EC) is one of the efficient electrochemical approaches for industrial wastewater treatment. The present work aims to reach optimum conditions for achieving simultaneous removal of chromium and cadmium ions from synthetic wastewater by EC through assessment of different parameters like electrodes material, electrode configuration, initial pH, current density, initial temperature, and initial contaminate concentration. In addition, a comparison between chemical coagulation and EC efficiency for Chromium and cadmium removal was presented. Results showed that the (Fe-Al), an anode and cathode, achieved better removal efficiency than other electrodes configurations (Fe-Fe / Al-Fe / Al- Al). Also, the increase of initial temperature and current density enhanced the removal efficiency. In contrast, the increase in the initial concentration reduced the removal efficiency. The complete removal of Chromium achieved through the use of Fe-Al electrodes and current density was 12.50 mA/cm2 with solution pH of 5.8, temperature was 25oC and an initial concentration of 280 mg/L. On the other hand, Cadmium’s complete removal was achieved through the use of Fe-Allectrodes, at pH of 5.8, applied current 1.4 A and 60oC. Therefore, EC was proved to be better approach than conventional coagulation in case of treatment of wastewater containing different types of heavy metals ions with high initial concentrations.

Color Removal of Reactive Brilliant Blue KN-R Simulated Dye Wastewater by Using Novel Flocculants

2012 ◽  
Vol 610-613 ◽  
pp. 1939-1942
Author(s):  
Ji Zhou Li ◽  
Xu Yin Yuan ◽  
Ming Tian ◽  
Hao Ran Ji ◽  
Wan Jiang
Keyword(s):  
Removal Efficiency ◽  
Color Removal ◽  
Brilliant Blue ◽  
Solution Temperature ◽  
Optimal Dosage ◽  
Dye Wastewater ◽  
Decolorization Efficiency ◽  
Initial Ph ◽  
Simulated Wastewater ◽  
Ph Range

In this study, five novel flocculants, QTRY-02, DC-491, Fennofix K97, BWD-01 and MD-03 were chosen to treat Reactive Brilliant Blue KN-R simulated wastewater by jar tests. The effect of flocculant dosage, initial pH, solution temperature of simulated dye wastewater and sedimentaion time on the color removal was examined respectively. The maximum color removal efficiency of KN-R was over 82% after 20 minutes of sedimentation and the optimal dosage was 150mg/L for all flocculants. In the pH range from 3 to 11, small changes in the color removal efficiency for QTRY-02. While for BWD-01, the efficiency increased from 67.3% to 88.3%. For both QTRY-02 and MD-04, decolorization efficiency increased as the solution temperature increased from 10°C to 50°C and the same result appeared when prolonging the sedimentation time from 1 to 12 hours.

scholarly journals Bioremediation and Detoxification of Synthetic Wastewater Containing Triarylmethane Dyes by Aeromonas hydrophila Isolated from Industrial Effluent

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Chimezie Jason Ogugbue ◽  
Thomas Sawidis
Keyword(s):  
Aeromonas Hydrophila ◽  
Growth Parameters ◽  
Industrial Effluent ◽  
Treatment Plant ◽  
Textile Wastewater ◽  
Color Removal ◽  
Synthetic Wastewater ◽  
Operational Parameters ◽  
Operational Conditions ◽  
Triarylmethane Dyes

Economical and bio-friendly approaches are needed to remediate dye-contaminated wastewater from various industries. In this study, a novel bacterial strain capable of decolorizing triarylmethane dyes was isolated from a textile wastewater treatment plant in Greece. The bacterial isolate was identified as Aeromonas hydrophila and was shown to decolorize three triarylmethane dyes tested within 24 h with color removal in the range of 72% to 96%. Decolorization efficiency of the bacterium was a function of operational parameters (aeration, dye concentration, temperature, and pH) and the optimal operational conditions obtained for decolorization of the dyes were: pH 7-8, 35∘C and culture agitation. Effective color removal within 24 h was obtained at a maximum dye concentration of 50 mg/L. Dye decolorization was monitored using a scanning UV/visible spectrophotometer which indicated that decolorization was due to the degradation of dyes into non-colored intermediates. Phytotoxicity studies carried out using Triticum aestivum, Hordeum vulgare, and Lens esculenta revealed the triarylmethane dyes exerted toxic effects on plant growth parameters monitored. However, significant reduction in toxicity was obtained with the decolorized dye metabolites thus, indicating the detoxification of the dyes following degradation by Aeromonas hydrophila.

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