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.

Catalytic Wet Peroxide Oxidation of Dye Wastewater Using Fe2O3-CeO2/γ-Al2O3 as Catalyst

2014 ◽  
Vol 884-885 ◽  
pp. 29-32
Author(s):  
Hong Ya Li ◽  
Biao Yan ◽  
Bin Xia Zhao ◽  
Xiao Li Zhang
Keyword(s):  
Ph Value ◽  
Removal Rate ◽  
Cod Removal ◽  
Dye Wastewater ◽  
Peroxide Oxidation ◽  
Oxidation Method ◽  
Wet Peroxide Oxidation ◽  
Initial Ph ◽  
Catalytic Wet Peroxide Oxidation ◽  
Cod Removal Rate

Fe2O3-CeO2/γ-Al2O3 was used as catalyst for treating the dye wastewater by catalytic wet peroxide oxidation method, the effect of reaction temperature, initial pH value of the wastewater, dosage of catalyst and hydrogen peroxide on the COD removal were studied. Results showed that 90.3% of COD removal rate can be obtained under the condition of 90°C, pH=7, 0.8g catalyst/100 mL wasterwater, and 6mL H2O2 /100 mL wasterwater.

Experimental Study on the Supercritical Water Co-Oxidation of Municiple Sludge with Methanol

2014 ◽  
Vol 651-653 ◽  
pp. 1341-1344
Author(s):  
Sheng Wen ◽  
Shu Zhong Wang ◽  
Yan Hui Li ◽  
Yu Zhen Wang
Keyword(s):  
Experimental Study ◽  
Acetic Acid ◽  
Co Oxidation ◽  
Ring Opening ◽  
Mass Fraction ◽  
Oxidation Process ◽  
Removal Rate ◽  
Methanol Solution ◽  
Cod Removal ◽  
Cod Removal Rate

The influence of methanol on the sludge removal rate of COD was investigated and the mechanism was obtained. The results show that the adding of methanol solution can improve the sludge COD removal rate, when the mass fraction of methanol is 5%, COD removal rate can be highly 99.98% compared 98.26% of that without methanol. The mechanism of co-oxidation is that methanol oxidation process can produce free radicals HO· and HO2·, they attack intermediate phenol and acetic acid, promote acetic acid to C-C bond fracture and ring-opening of phenol.

Experimental Advancements of Wastewater Disposal in Coal Chemical Industry by Yeasts

2014 ◽  
Vol 1073-1076 ◽  
pp. 941-948
Author(s):  
Li Li Wang ◽  
Qian Yang
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Chemical Industry ◽  
Ph Value ◽  
Removal Rate ◽  
Cod Removal ◽  
Good Effect ◽  
Coking Wastewater ◽  
Torula Yeast ◽  
N Removal ◽  
Cod Removal Rate

The research in this paper focuses on improving the COD removal rate of the coking wastewater and the NH3-N removal rate and thus diversifying measures to dispose microbial floras in wastewater from the coal chemical industry. The means of adding nutrients, acid treatment and coagulation sedimentation react synergistically to dispose the organic contaminants in the coking wastewater. We attempted to combine Saccharomyces cerevisiae, Torula yeast, tropical Candida mycoderma, etc. to exploit the respective advantages to the full and improve the disposal effect. According to the COD sample (27000-30000) and NH3-N (2500-3000) offered by the client company, the COD removal rate ranged from 24.2% to 31.8% in the mixed experiment group of Saccharomyces cerevisiae and Torula yeast, with NH3-N removal rate from 63.5% to 69.6%. Obviously, the NH3-N removal rate produced good effect. Meanwhile, the COD removal rate ranged form 35.3% to 41.8% in the experiment group only adjusting PH value and the NH3-N removal rate ranged from 40.2% to 50.2%. It is obvious that NH3-N removal rate is influenced by the amount of bacterial strain.

Photocatalytic Oxidation Degradation Behavior on Fracturing Wastewater in Oilfield

2011 ◽  
Vol 396-398 ◽  
pp. 1918-1922 ◽  
Author(s):  
Li Ping Wan ◽  
Ying Feng Meng ◽  
Gao Li ◽  
Hua Zhou
Keyword(s):  
Photocatalytic Oxidation ◽  
Ph Value ◽  
Removal Rate ◽  
Oil Field ◽  
Cod Removal ◽  
Composite Catalyst ◽  
Application Time ◽  
Secondary Pollution ◽  
Cod Removal Rate ◽  
Temperature Activation

Due to great variety additives and disposal difficulty, chemical method, biochemical method and solidification are adopted to treat fracturing wastewater in oil field. These processes easily bring about shortcomings, including high cost and secondary pollution. Studied on the treatment of fracturing wastewater of 4# well in Sichuan Oilfield by modified bentonite loading TiO2-Ag2O composite catalyst, COD removal rate is determined for different condition of pH value of solution, adding content of TiO2, inflating volume and light application time. The optimal condition is obtained as follows: pH value of solution is 3, adding content of TiO2 is 0.4-0.5%, inflating volume is 15L/min and light application time is 3h. Under this condition, COD removal rate of fracturing wastewater is 58.1%. The composite catalyst performance is stable and without secondary pollution. It is reusable by high temperature activation, so it can reduce wastewater treatment cost, and should be widely applied.

Pretreatment of furfural industrial wastewater by Fenton, electro-Fenton and Fe(II)-activated peroxydisulfate processes: a comparative study

2014 ◽  
Vol 70 (3) ◽  
pp. 414-421 ◽  
Author(s):  
C. W. Yang ◽  
D. Wang ◽  
Q. Tang
Keyword(s):  
Comparative Study ◽  
Industrial Wastewater ◽  
Ph Value ◽  
Removal Rate ◽  
Aeration Rate ◽  
Cod Removal ◽  
Optimal Conditions ◽  
Initial Concentration ◽  
Cod Removal Rate ◽  
Pretreatment Technology

The Fenton, electro-Fenton and Fe(II)-activated peroxydisulfate (PDS) processes have been applied for the treatment of actual furfural industrial wastewater in this paper. Through the comparative study of the three processes, a suitable pretreatment technology for actual furfural wastewater treatment was obtained, and the mechanism and dynamics process of this technology is discussed. The experimental results show that Fenton technology has a good and stable effect without adjusting pH of furfural wastewater. At optimal conditions, which were 40 mmol/L H2O2 initial concentration and 10 mmol/L Fe2+ initial concentration, the chemical oxygen demand (COD) removal rate can reach 81.2% after 90 min reaction at 80 °C temperature. The PDS process also has a good performance. The COD removal rate could attain 80.3% when Na2S2O8 initial concentration was 4.2 mmol/L, Fe2+ initial concentration was 0.1 mol/L, the temperature remained at 70 °C, and pH value remained at 2.0. The electro-Fenton process was not competent to deal with the high-temperature furfural industrial wastewater and only 10.2% COD was degraded at 80 °C temperature in the optimal conditions (2.25 mA/cm2 current density, 4 mg/L Na2SO4, 0.3 m3/h aeration rate). For the Fenton, electro-Fenton and PDS processes in pretreatment of furfural wastewater, their kinetic processes follow the pseudo first order kinetics law. The pretreatment pathways of furfural wastewater degradation are also investigated in this study. The results show that furfural and furan formic acid in furfural wastewater were preferentially degraded by Fenton technology. Furfural can be degraded into low-toxicity or nontoxic compounds by Fenton pretreatment technology, which could make furfural wastewater harmless and even reusable.

Study on Treatment of M-Cresol Wastewater Using Potassium Ferrate(VI)

2012 ◽  
Vol 610-613 ◽  
pp. 2367-2371 ◽  
Author(s):  
Ming Zhong Hu ◽  
Zhen He Shi ◽  
Hong Yan Zhao
Keyword(s):  
Reaction Time ◽  
Ph Value ◽  
Removal Rate ◽  
Cod Removal ◽  
Potassium Ferrate ◽  
Optimum Conditions ◽  
Initial Concentration ◽  
Cod Removal Rate

The effects of the oxidation of potassium ferrate and the flocculation on cresol wastewater water were evaluated. This research aimed at determining the optimum conditions for the COD removal rate duing cresol wastewater water process. The results showed that potassium ferrate dosage of 1.1g/L, the pH value of 5, reaction time 15min, m-cresol initial concentration of 200 mg/L were the optimum conditions. Under the optimum conditions, COD removal rate was over 67%.

Study on Treatment of Polytetrahydrofuran Wastewater by Iron-Carbon Micro Electrolysis

2013 ◽  
Vol 295-298 ◽  
pp. 1307-1310
Author(s):  
Xi Tian ◽  
Ming Xin Huo ◽  
De Jun Bian ◽  
Sheng Shu Ai ◽  
Qing Kai Ren
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Contact Time ◽  
Ph Value ◽  
Removal Rate ◽  
Volume Ratio ◽  
Cod Removal ◽  
Electrolysis Process ◽  
Cod Removal Efficiency ◽  
Cod Removal Rate

The wastewater produced from the polytetrahydrofuran (PolyTHF) was treated with iron-carbon micro electrolysis process. This paper had studied the COD removal efficiency influences of primary PH value, reaction time, the quality ratio of the iron-carbon, the quality and volume ratio of Fe-wastewater. The results show that when pH value is 3, the quality ratio of the iron-carbon is 11 and the quality and volume ratio of Fe and wastewater is 17 with contact time of 90 min, the wastewater COD removal rate can reach as high as 95.0%.

scholarly journals Catalytic wet peroxide oxidation degradation of magenta wastewater and preparation of FeOCl/montmorillonite

2021 ◽  
Author(s):  
Tiancheng Hun ◽  
Binxia Zhao ◽  
Tingting Zhu ◽  
Linxue Liu ◽  
Zhiliang Li ◽  
...  
Keyword(s):  
Removal Rate ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Impregnation Method ◽  
Dye Wastewater ◽  
Peroxide Oxidation ◽  
Melting Method ◽  
Wet Peroxide Oxidation ◽  
Catalytic Wet Peroxide Oxidation ◽  
Cod Removal Rate

Abstract The iron oxychloride/pillared montmorillonite (FeOCl/MMT) catalyst was prepared by wet impregnation method and solid melting method. Various characterization techniques were used to analyze the microscopic morphology and structure of a series of catalysts. Moreover, the catalysts were used to treat magenta simulated dye wastewater through catalytic wet peroxide oxidation (CWPO) degradation. The magenta removal rate and chemical oxygen demand (COD) removal rate of the magenta simulated dye wastewater were used to evaluate the catalytic performance of the catalyst, and the optimal catalyst preparation conditions were selected. The results showed that the solid melting method was more favorable to the preparation of the catalyst, and the COD removal rate of wastewater can reach 70.8% when the FeOCl load was 3%. Moreover, 96.2% of the magenta in the solution has been removed. The COD removal rate of the magenta wastewater decreased by only 12.4% after the catalyst was repeatedly used six times, indicating that the catalyst has good activity and stability. The Fermi equation can simulate the reaction process of the catalyst treating magenta wastewater at high temperature.

A Research on Coal Washing Water Treatment with Keratin Additives

2012 ◽  
Vol 524-527 ◽  
pp. 930-934
Author(s):  
Bi Chen ◽  
Zhong Jiang Tang
Keyword(s):  
Water Treatment ◽  
Ph Value ◽  
Removal Rate ◽  
Cod Removal ◽  
Feather Keratin ◽  
Operation Conditions ◽  
Cod Removal Rate ◽  
Washing Water

Through adding keratin additives to coal washing water with SS removal rate as an index, this paper draws a conclusion that the best operation conditions of treatment are: adding feather keratin flocculation additives by 2 g / L to the wastewater of pH value 5～7, treating it at 20～30°C for 30 minutes. The SS removal rate is over 98%，meanwhile COD removal rate can reach 34% under the conditions.

Research on Treatment Organic Waste Liquid of High Concentration Acid by Cavitation Impinging - Micro Electrolytic Method

2014 ◽  
Vol 1073-1076 ◽  
pp. 986-989 ◽  
Author(s):  
Fu Bao Li ◽  
Xiao Bai Li ◽  
Hao Wu ◽  
Shu Yi Xiao
Keyword(s):  
Production Cost ◽  
Organic Waste ◽  
Ph Value ◽  
Removal Rate ◽  
Cod Removal ◽  
Optimal Conditions ◽  
High Concentration ◽  
Electrolysis Method ◽  
Cod Removal Rate ◽  
Lower Production

The high concentration and high acid organic waste liquid is treated by using the self-developed drum type cavitation impinging stream—micro electrolysis reactor. Under optimal conditions, namely iron-carbon ratio of 1: 1, each reaction time 3h, standing reflux for 2 times, first filler dosage 200g, successive half, controlling the pH value of less than 3. Waste liquid COD removal rate can reach 93.5%, and the biodegradability of the effluent B/C is more than or equal to 0.4. By comparing the treatment effect of cavitation impinging assisted and simple micro electrolysis, it is founded that COD removal rate is high by using cavitation impinging assisted micro electrolysis method the processing time is short, the water is good biodegradability lower production cost, convenient control and operation, with a higher value.

Sign in / Sign up

Export Citation Format

Share Document