Study on Treatment of Wastewater from Papermaking Using Fenton Oxidation

2013 ◽  
Vol 726-731 ◽  
pp. 1760-1763 ◽  
Author(s):  
Gang Li ◽  
Jun Yu ◽  
Yan Hao Zhang ◽  
Lei Gao ◽  
Bo He
Keyword(s):  
Reaction Time ◽  
Influencing Factors ◽  
Fenton Oxidation ◽  
Fenton Process ◽  
Optimal Conditions ◽  
Biochemical Treatment ◽  
Oxidation Treatment ◽  
Paper Making ◽  
Papermaking Wastewater

The performance of biochemical treatment effluent from paper making wastewater treated by Fenton process was evaluated. The experiment result shows that the importance of influencing factors for Fenton oxidation treatment was H2O2 concentrations > pH > FeSO4 concentrations > reaction time. With the optimal conditions of reaction, that is pH3 (initial pH5), FeSO4 3.6 mmol/L, H2O2 3.4 mmol/L, and reaction time 60 min, the removals of COD and color for papermaking wastewater reached over 85% and 90%, respectively. The result also showed that in the process of Fenton method in the treatment of papermaking wastewater, for removing COD, the function by oxidation account for 15.5%, and the function of flocculation accounted for 69.8%.

Advanced Processing of Biologically-Treated Leachate by PAC

2011 ◽  
Vol 474-476 ◽  
pp. 1057-1062
Author(s):  
Hai Ying Zhang ◽  
Dong Hui Chen ◽  
Yi Zheng ◽  
Jing Yu Qi
Keyword(s):  
Optimal Condition ◽  
Influencing Factors ◽  
Removal Efficiency ◽  
Advanced Treatment ◽  
Optimal Dosage ◽  
Optimal Conditions ◽  
Wastewater Discharge ◽  
Biochemical Treatment ◽  
Effluent Quality

In this study, biologically treated leachate was treated using PAC and PAC + PAM, respectively, to study removal efficiency of COD, SS and color as a function of such influencing factors as pH, dosage of PACand/or PAM. It was found that optimal dosage and pH are 800 mg/L and 6 for PAC. The optimal condition when using PAM + PACfor removal of COD was 10-minute reaction, pH of 5, PAC dosage of 800 mg/L, PAM dosage of 3 mg/L. Effluent quality after coagulation at the optimal conditions met requirements of the tertiary standard described in “Integrated wastewater discharge standard”. Coagulation using PAM + PAC at the optimal condition was recommended for advanced treatment of refractory leachate after biochemical treatment.

Multiple responses analysis and modeling of Fenton process for treatment of high strength landfill leachate

2011 ◽  
Vol 64 (8) ◽  
pp. 1652-1660 ◽  
Author(s):  
Soraya Mohajeri ◽  
Hamidi Abdul Aziz ◽  
Mohammed Ali Zahed ◽  
Leila Mohajeri ◽  
Mohammed J. K. Bashir ◽  
...  
Keyword(s):  
Reaction Time ◽  
Landfill Leachate ◽  
High Strength ◽  
Fenton Oxidation ◽  
Fenton Process ◽  
Factors Influencing ◽  
Potential Source ◽  
Groundwater Ecosystems ◽  
Main Factors ◽  
Quadratic Effects

Landfill leachate is one of the most recalcitrant wastes for biotreatment and can be considered a potential source of contamination to surface and groundwater ecosystems. In the present study, Fenton oxidation was employed for degradation of stabilized landfill leachate. Response surface methodology was applied to analyze, model and optimize the process parameters, i.e. pH and reaction time as well as the initial concentrations of hydrogen peroxide and ferrous ion. Analysis of variance showed that good coefficients of determination were obtained (R2 > 0.99), thus ensuring satisfactory agreement of the second-order regression model with the experimental data. The results indicated that, pH and its quadratic effects were the main factors influencing Fenton oxidation. Furthermore, antagonistic effects between pH and other variables were observed. The optimum H2O2 concentration, Fe(II) concentration, pH and reaction time were 0.033 mol/L, 0.011 mol/L, 3 and 145 min, respectively, with 58.3% COD, 79.0% color and 82.1% iron removals.

Advanced Processing of Biologically-Treated Papermaking Wastewater by Poly-Aluminum Chloride (PAC)

2013 ◽  
Vol 409-410 ◽  
pp. 129-132
Author(s):  
Yong Qiang Zhu ◽  
Yu Ling Feng ◽  
Hai Ying Zhang ◽  
Zhan Jun Zhang
Keyword(s):  
Removal Efficiency ◽  
Aluminum Chloride ◽  
Industrial Wastewater ◽  
Optimal Dosage ◽  
Optimal Conditions ◽  
Wastewater Discharge ◽  
Paper Making ◽  
Stirring Time ◽  
Papermaking Wastewater

In this study, biologically treated paper-making wastewater was treated using PAC to study removal efficiency of color as a function of pH and dosage of PAC. It was found that PAC was relatively effective in removing color from biologically papermaking wastewater. The optimal dosage, pH and stirring time were 40 mL L-1, 5 and 30 min, respectively. Effluent color after coagulation at the optimal conditions was 40 PCU, meeting requirements of Industrial Wastewater Discharge Standard of Pulping and Papermaking (GB3544-2008) . Therefore, PAC dosage of 40 mL L-1 and pH of 5 were recommended for treatment of biologically treated papermaking wastewater.

Study of Performance and Synthesis of Et3NHC1-AlC13

2014 ◽  
Vol 1051 ◽  
pp. 178-181
Author(s):  
Li Ming Zhang ◽  
Hai Yan Hu
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Ionic Liquids ◽  
Reaction Time ◽  
Influencing Factors ◽  
Mole Fraction ◽  
Catalytic Performance ◽  
Temperature Reaction ◽  
Optimal Conditions ◽  
Alkylation Of Benzene

This thesis is focused on the catalyst of ionic liquids. Firstly, chloroaluminate ionic liquid consisting of triethylaminia hydrochloride and anhydrous A1C13 was prepared, and its catalytic performance on the alkylation of benzene with 1-bromobutane was studied experimentally. The composition of the system was analyzed using gas chromatogram. The effect of such influencing factors were investigated as the constitute of ionic liquid,the dosage of catalyst, the mole ratio of benzene to 1-bromobutane, temperature,reaction time,the regeneration approach of the used ionic liquid catalyst. The results suggested that it helps to increase the conversion of propylene and the selectivity of 1-butylbenzene by increasing the mole fraction of AlCl3 in the ionic liquid, the amount of catalyst, the mole ratio of benzene to 1-butylbenzene, reaction time and by reducing reaction temperature. At optimal conditions of 66.7% of mole fraction of AlCl3 in the ionic liquid, l0wt% of catalyst with respect to benzene, 10:1 of mole ratio of benzene to 1-bromobutane and 313 .15K, both conversion of 1-bromobutane and selectivity of butylbenzene can reach 96.6% in 20 minutes. The activity of the catalyst can be basically remained after eight times reused. For the used ionic liquid, its catalytic activity can be partially recovered via adding some extra AlCl3 notwithstanding less satisfactory. The catalyst performance of ionic liquids on the esterification of ethanol with ethanonic acid was studied.

Treatment of Polymerization Effluents from Acrylic Fiber Manufacturing Using a Combination Process of Flocculation and Fenton Oxidation

2011 ◽  
Vol 332-334 ◽  
pp. 1582-1585
Author(s):  
Bin Cai ◽  
Xin Wang ◽  
Xiao Li Dai ◽  
Guang Xu Yan ◽  
Shao Hui Guo
Keyword(s):  
Reaction Time ◽  
Total Nitrogen ◽  
Fenton Oxidation ◽  
Fenton Process ◽  
Combined Process ◽  
Acrylic Fiber ◽  
Combination Process ◽  
Fiber Manufacturing ◽  
Acrylic Fibers

A combined process of flocculation and Fenton oxidation was studied for the treatment of polymerization effluents (PME) from the manufacture of dry-spun acrylic fibers. 5 inorganic and 3 organic flocculants were investigated and the optimal regents and conditons were PAC (at 25°C, pH=8 and a dosage of 150 mg/L), and Z7650 (at 25°C, pH=6 and a dosage of 10 mg/L). Under this condition, the COD was removed by 23.1% of the initial 1824 mg/L. The optimum efficiency of Fenton process was determined at 25°C and pH=4 with a reaction time of 90 min. The dosage of H2O2 and the rate of c(H2O2)/c(FeSO4) were respectively 0.53 mol/L and 20:1. Finally, the removal of COD, total nitrogen, ammonia, SO32- and turbidity by the combined process were 64.0%, 99.3%, 99.6%, 99.7% and 89.4% respectively. BOD/COD was also improved from 0.09 to 0.25.

Optimization of Fenton Process for Removal Organic Substance in Landfill Leachate

2012 ◽  
Vol 518-523 ◽  
pp. 2165-2169
Author(s):  
Fu Geng Zha ◽  
Guo Chun Xu ◽  
Xiao Qing Chen ◽  
Ming Xu Zhang
Keyword(s):  
Reaction Time ◽  
Landfill Leachate ◽  
Organic Substance ◽  
Operating Conditions ◽  
Molar Ratio ◽  
Fenton Process ◽  
Optimal Conditions ◽  
Temperature Influence ◽  
Batch Mode ◽  
Fenton's Reagent

The treatment of landfill leachate by Fenton process was carried out in a batch mode. The effect of operating conditions such as reaction time, pH, dosage of H2O2 and [H2O2]/[Fe2+] molar ratio and temperature on the efficacy of Fenton process was investigated. It is demonstrated that Fenton’s reagent can effectively degrade leachate organics in 30 min. The optimal conditions were pH was 3, dosage of H2O2 was 2 times of theoretical stoichiometry, [H2O2]/[Fe2+] molar ratio was 5, temperature influence the removal efficency relatively small compared to other factors.

Treatment of Sodium Formate Wastewater by Fenton Oxidation Process

2012 ◽  
Vol 573-574 ◽  
pp. 627-630
Author(s):  
Zhi Gang Chen ◽  
Rui Xue Zhang ◽  
Bo Zhang ◽  
An Ping Wei
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Oxidation Process ◽  
Ph Value ◽  
Sodium Formate ◽  
Cod Removal ◽  
Fenton Oxidation ◽  
Fenton Process ◽  
Initial Ph ◽  
Fenton Oxidation Process

In this study, in order to reduce the sodium formate concentration thereby reducing toxicity, the treatment of this wastewater by Fenton process was investigated. The effects of initial PH value, reaction time, concentration of FeSO4• 7H2O, and H2O2 dosage on the removal efficiency of COD were studied respectively. The experiment results show that when using Fenton oxidization pretreatment process, with pH 2.0, FeSO4•7H2O concentration 4000mg/L, H2O2(30 % ) portion 4ml/L, and reaction time 20min, COD removal efficiency was more than 50%, oxidization efficiency was good.

Study on the Synthesis of Ethylene Glycol by Catalytic Hydrolyze of Ethylene Carbonate

2014 ◽  
Vol 989-994 ◽  
pp. 79-82
Author(s):  
Min Zhang
Keyword(s):  
Reaction Time ◽  
Ethylene Glycol ◽  
Influencing Factors ◽  
Reaction Temperature ◽  
Mass Fraction ◽  
Ethylene Carbonate ◽  
Catalytic Hydrolysis ◽  
Optimal Conditions ◽  
Reaction Products ◽  
Hydrolysis Of

The process for ethylene glycol (EG) by catalytic hydrolysis of ethylene carbonate (EC) was studied. The influencing factors of the reaction products were studied which include the reaction temperature, the mole ratio of H2O to EC, the mass fraction of the catalyst and the reaction time. The optimal conditions were identified as follows: the reaction temperature is 140-145°C, n (H2O) :n (EC) = 2.0-2.5 : 1, the catalyst of Al2O3is about 2.0wt%, the reaction time is about two hours. Under the above conditions, EC can be completely hydrolyzed and the selectivity of EG is above 98%.

Influencing Factors and Conditions on the Synthesis of Double Activity Sulfate-Gallate Bagasse Xylan

2013 ◽  
Vol 842 ◽  
pp. 224-227
Author(s):  
He Ping Li ◽  
Guan Wei Yang ◽  
Guan Wei Yang ◽  
Jin Wei Yuan
Keyword(s):  
Reaction Time ◽  
Gallic Acid ◽  
Influencing Factors ◽  
Degree Of Substitution ◽  
Optimal Conditions ◽  
Mass Ratio ◽  
Acid Base ◽  
Reaction Solution ◽  
Acid Base Titration

A kind of double activity sulfate-gallate bagasse xylan was synthesized by grafting gallic acid onto bagasse xylan sulfate in the presence of catalyst via esterification. The bagasse xylan sulfate was synthesized by using sodium nitrilotriacetic sulfonate as esterifying agent in our previous work. The degree of substitution (DS) of product was determined with the method of acid-base titration. The influencing factors of the various conditions on the reaction of bagasse xylan sulfate with gallic acid was investigated, and the optimal conditions were obtained as follows:reaction temperature 45 °C, reaction time 5.0 h, mass ratio of xylan sulfate to catalyst 50:1, ratio of reaction solution to bagasse xylan 15:1 (mL/g).

scholarly journals Photocatalytic-Fenton Process under Simulated Solar Radiation Promoted by a Suitable Catalyst Selection

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 885
Author(s):  
Aida M. Díez ◽  
Helen E. Valencia ◽  
Maria Meledina ◽  
Joachim Mayer ◽  
Yury V. Kolen'ko
Keyword(s):  
Methylene Blue ◽  
Solar Radiation ◽  
Water Scarcity ◽  
Published Data ◽  
Fenton Process ◽  
Optimal Conditions ◽  
Operational Conditions ◽  
The Future ◽  
Simulated Solar Radiation ◽  
Catalyst Selection

Considering water scarcity, photo-based processes have been presented as a depollution technique, which should be optimized in order to be applied in the future. For that, the addition of an active photocatalyst and the usage of solar radiation are mandatory steps. Thus, Fe3O4–SiO2–TiO2 was synthesized, and its performance was evaluated using simulated solar radiation and methylene blue as a model pollutant. Under optimal conditions, 86% degradation was attained in 1 h. These results were compared to recent published data, and the better performance can be attributed to both the operational conditions selection and the higher photocatalyst activity. Indeed, Fe3O4–SiO2–TiO2 was physico-chemically characterized with techniques such as XRD, N2 isotherms, spectrophotometry, FTIR, electrochemical assays and TEM.

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