Decolorization of textile wastewater by ozonation and Fenton's process

2002 ◽  
Vol 45 (12) ◽  
pp. 279-286 ◽  
Author(s):  
M.F. Sevimli ◽  
C. Kinaci
Keyword(s):  
Hydrogen Peroxide ◽  
Ferrous Sulfate ◽  
Cod Removal ◽  
Color Removal ◽  
Ozone Dose ◽  
Fenton’S Oxidation ◽  
Removal Efficiencies ◽  
Fenton's Oxidation ◽  
Color And Cod Removal ◽  
Fenton's Process

The aim of this study is to investigate the effect of some operational parameters on the efficiency of ozonation and Fenton's process for decolorization and COD removal. Acid Red 337 and Reactive Orange 16 dye solutions and the effluents of acid and reactive dye-bath effluents were used in the experiments. The influence of ozone dose and pH for color and COD removal from the wastewater were studied. Increasing the ozone dose increased the rate constants, and color and COD removal efficiencies. Ozone consumption ratio per unit color and COD removal at any time was found to be almost the same while the applied ozone dose was different. pH did not significantly affect color and COD removal from the wastewater by ozonation. In spite of having high color removal efficiencies (60–91%), limited COD removal efficiencies between 9–17% at 30 minutes ozonation time were obtained. In the Fenton oxidation experiments, the effects of pH, temperature, dosage of ferrous sulfate and hydrogen peroxide, and the proper ratio of Fe(II)/H2O2 were studied. The result indicates that up to 99% color removal and 82% COD removal can be obtained by Fenton's oxidation. While Fenton's oxidation was greatly affected by the pH value, temperature of wastewater did not significantly affect the Fenton process for color removal. Increasing the dose of both hydrogen peroxide and ferrous sulfate enhanced the removal efficiencies of color and COD. Suitable ratios of Fe(II)/H2O2 were found to be between 0.5 and 0.83.

Coagulation of textile secondary effluents with Fenton's reagent

1997 ◽  
Vol 36 (12) ◽  
pp. 215-222 ◽  
Author(s):  
Shyh-Fang Kang ◽  
Huey-Min Chang
Keyword(s):  
Hydrogen Peroxide ◽  
Cod Removal ◽  
Color Removal ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Effluent Standards ◽  
Secondary Effluents ◽  
Removal Efficiencies

This study was designed to use both artificial and real textile secondary effluents to evaluate (1) the COD and color removal efficiencies for ferrous coagulation and Fenton's coagulation, and (2) the feasibility of using hydrogen peroxide to improve ferrous coagulation to meet more stringent effluent standards. The results indicate that the optimum pHs for both ferrous coagulation and Fenton's preoxidation processes range between 8.0–10 and 3.0–5.0, respectively. The rate for color removal is faster than that for COD removal in the Fenton's preoxidation process. The removals of COD and color are mainly accomplished during Fenton's preoxidation step. The ratio of COD removal for Fenton's coagulation versus ferrous coagulation, given the same ferrous dosage, ranges from 1.4 to 2.3, and it ranges from 1.1 to 1.9 for color removal, using two effluent samples. Therefore, using hydrogen peroxide can enhance the ferrous coagulation, and this ensures more stringent effluent standards of COD and color are met.

Control of 2-Methylisoborneol and Geosmin by Ozone and Peroxone: A Pilot Study

1992 ◽  
Vol 25 (2) ◽  
pp. 291-298 ◽  
Author(s):  
B. Koch ◽  
J. T. Gramith ◽  
M. S. Dale ◽  
D. W. Ferguson
Keyword(s):  
Hydrogen Peroxide ◽  
Ferrous Sulfate ◽  
Contact Time ◽  
Pilot Scale ◽  
Ozone Dose ◽  
Ammonia Addition ◽  
Removal Efficiencies ◽  
Odorous Compounds ◽  
Water District ◽  
Percent Removal

A pilot-scale study of ozone and PEROXONE (ozone in combination with hydrogen peroxide) for the removal of the odorous compounds 2-methylisoborneol (MIB) and geosmin in drinking water has been conducted at the Metropolitan Water District of Southern California. The study investigated the effects of ozone dosage, ratio of hydrogen peroxide to ozone (H202/03), and contact time. It was found that MIB and geosmin removal increased with higher applied ozone doses, but longer contact times over the range of 6-12 min were not significant. It was determined that 80-90 percent removal could be achieved with an ozone dose of approximately 4.0 mg/l, as compared to an ozone dose of approximately 2.0 mg/l at a H202/03 ratio of 0.2. Also investigated were the effects of alternative contactor configurations, ferrous sulfate as an alternative coagulant, bromide and ammonia addition, and simulated turbidity on the removal efficiencies of the two odorous compounds.

A Study of Fenton’s Oxidation Pretreatment on Dye Wastewater Containing Acetic Acid

2014 ◽  
Vol 1044-1045 ◽  
pp. 215-218
Author(s):  
Xian Huan Qiu ◽  
Hai Yu ◽  
Peng Fei Deng
Keyword(s):  
Acetic Acid ◽  
Processing Time ◽  
Ph Value ◽  
Removal Rate ◽  
Cod Removal ◽  
Dye Wastewater ◽  
Fenton’S Oxidation ◽  
Effects Of Ph ◽  
Cod Removal Rate ◽  
Fenton's Oxidation

In the presence of acetic acid, the effects of pH, processing time, addition of Fe2+ and H2O2 on dye wastewater treatment were studied. Experimental results showed that in the presence of acetic acid, when the pH value was 4, the processing time was 30.0min, addition of ferrous sulfate was 4.8g/L, and addition of hydrogen peroxide was 56mL/L, the treatment effect was the best, COD removal rate reached 51.0%. Further studied of the effect of the presence of acetic acid on Fenton’s oxidation of dye wastewater, the results showed that without of acetic acid, the COD removal rate was higher than that with acetic acid. And the effect of Fenton's reagent on oxidation of dye substances was interfered by the presence of acetic acid.

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 refractory organics and color in pigment wastewater with Fenton oxidation

1999 ◽  
Vol 39 (10-11) ◽  
pp. 189-192 ◽  
Author(s):  
T. J. Park ◽  
K. H. Lee ◽  
E. J. Jung ◽  
C. W. Kim
Keyword(s):  
Oxidation Process ◽  
Effective Means ◽  
Treatment Plant ◽  
Molar Ratio ◽  
Tertiary Treatment ◽  
Optimum Conditions ◽  
Fenton’S Oxidation ◽  
Removal Efficiencies ◽  
Fenton's Oxidation ◽  
Final Effluent

This study was designed to evaluate (1) the removal of the non-biodegradable organics and color by Fenton's oxidation (2) the feasibility of Fenton's oxidation as a pretreatment or tertiary treatment following the activated sludge process in the pigment wastewater. The study was divided into two parts. The first part consisted of investigations on raw Yellow wastewater and Red wastewater, the second part was carried out on the final effluent from the existing extended aeration treatment plant. The batch test was conducted to determine the optimum conditions for plant operation such as pH, H2O2 dosage, molar ratio of Fe2+/H2O2 and contact time. It was found that the removal efficiencies of COD were 54.2%, 52.6% and 58.9%, the removal efficiencies of the color were 91.2%, 18.1% and 45.7%, for Red, Yellow Wastewater and Final Effluent, respectively. In the Yellow wastewater, BOD5COD ratio was not changed much after Fenton's oxidation, but in the case of the Red wastewater, BOD5COD ratio was increased from 0.04 to 0.36. Therefore Fenton's oxidation process is a very effective means for a pretreatment or tertiary treatment in the Pigment wastewater.

scholarly journals Effect of various parameters during degradation of toxic p-anisidine by Fenton’s oxidation

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Naveen Kumar Chaturvedi ◽  
Surjit Singh Katoch
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Aquatic Life ◽  
Oxidation Processes ◽  
Fenton’S Oxidation ◽  
Pharmaceutical Industries ◽  
Fenton's Oxidation ◽  
Maximum Removal

Abstractp-Anisidine being a component of wastewater generated through dye and pharmaceutical industries is highly toxic and carcinogenic in nature. Therefore, its presence in wastewater requires prior treatment before its disposal from the point of safety of human and aquatic life. Fenton’s oxidation is a type of advanced oxidation processes which is efficient, ecofriendly and reliable, and this was not studied for the removal of p-anisidine from wastewater. In this study, the effect of influent pH, hydrogen peroxide (H2O2) concentration and ferrous ion (Fe2+) concentration on the removal of p-anisidine by Fenton’s reagent was carried out on a laboratory scale. All samples were examined for initial and final concentrations of p-anisidine using UV–Vis spectrophotometry, and also initial and final COD was analyzed. p-Anisidine shows maximum absorbance at 296 nm. At pH 2.5 and [H2O2]/[Fe2+] of 70:1 for the initial p-anisidine concentration of 0.5 mM and for 24 h reaction time, the maximum removal of p-anisidine was found to be 88.95% and maximum COD removal was 76.43%.

Efficiency of Ozone, Activated Carbon and Microorganisms in Decolorisation of Pulp and Paper Mill Effluent

2009 ◽  
Vol 4 (2) ◽  
Author(s):  
W. Apiwatanapiwat ◽  
W. Phochinda ◽  
T. Kreetachat ◽  
P. Vaithanomsat
Keyword(s):  
Activated Carbon ◽  
Removal Efficiency ◽  
Retention Time ◽  
Paper Mill ◽  
Cod Removal ◽  
Color Removal ◽  
Pulp And Paper Mill ◽  
Paper Mill Effluent ◽  
Us Dollar ◽  
Color And Cod Removal

The efficiency of decolorisation and COD removal from pulp and paper mill effluent using ozone, activated carbon and microorganism were compared. The results showed that the highest color removal efficiency of 83.42% was obtained when ozone method was used with optimal pH 9 and retention time 60 min. However, the COD was decreased only by 5.50% at pH 9 and retention time 40 min. Similar COD removal efficiency of 68.99% was observed when activated carbon with pH 2 and retention time 180 min was employed and for microbial method, the COD removal efficiency of 77.67% was obtained when pH 7 and retention time 6 days was applied. While the efficiency in color removal using the microbial method was lower (36.2%) which was at pH 4.5 and retention time 2 days than that removed using activated carbon which was 79.79% at pH 2 and retention time 180 min. When an operation cost for each method was compared, it was found that the microbial treatment consumed the cost of 587.82 US dollar/1,000 L for color removal and 29,760 US dollar/1,000 L for COD removal whereas the ozone treatment consumed the lowest cost for both color and COD removal of 24.0 US dollar/1,000 L and 9.3 US dollar/1,000 L, respectively. Similarly, the activated carbon adsorption method consumed low cost for both color and COD removal of 40.62 US dollar/1,000 L.

Sign in / Sign up

Export Citation Format

Share Document