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%.

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.

Research of 6-Nitry Industrial Wastewater Treatment by Coagulation-Fenton Oxidation

2012 ◽  
Vol 518-523 ◽  
pp. 2745-2748
Author(s):  
Ling Yan Ren ◽  
Gang Xu
Keyword(s):  
Treatment Effect ◽  
Industrial Wastewater ◽  
Removal Rate ◽  
Sulfate Solution ◽  
Cod Removal ◽  
Fenton Oxidation ◽  
Fenton Reagent ◽  
Oxidation Treatment ◽  
Cod Removal Rate ◽  
Solution Acidity

The paper adopted Coagulation-Fenton Oxidation Method on treating the wastewater of 6-nitro-1,2 diazonium oxygroup naphthalene-4-sulfoacid production process (i.e. 6-nitry wastewater), introduced the treatment effect of the combined technology used on 6-nitry wastewater, and studied the factors influencing the treatment effect, to determine the reasonable parameters of the technology on treating 6-nitry wastewater. The results showed that Using polyaluminium chloride (mass fraction 2%) as flocculant for treating 6-nitry wastewater, the COD removal rate reached up to 48.7%; Making Fenton reagent oxidation treatment on coagulation yielding water, under the best conditions for solution acidity controlled at pH3 or so, in the 100 mL wastewater, 30% hydrogen peroxide was 5.0 mL, 0.5 mol/L ferrous sulfate solution was 4.0 mL, reaction time was 60 min, the COD removal rate could reach 98% or more.

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.

Aerobic granulation in a sequencing batch reactor (SBR) for industrial wastewater treatment

2005 ◽  
Vol 52 (10-11) ◽  
pp. 335-343 ◽  
Author(s):  
M. Inizan ◽  
A. Freval ◽  
J. Cigana ◽  
J. Meinhold
Keyword(s):  
Industrial Wastewater ◽  
Removal Rate ◽  
Batch Reactor ◽  
Experimental Tests ◽  
Cod Removal ◽  
High Concentration ◽  
Granule Formation ◽  
Aerobic Granulation ◽  
Cod Removal Rate ◽  
Set Up

Aerobic granulation seems to be an a attractive process for COD removal from industrial wastewater, characterised by a high content of soluble organic compounds. In order to evaluate the practical aspects of the process, comparative experimental tests are performed on synthetic and on industrial wastewater, originating from pharmaceutical industry. Two pilot plants are operated as sequencing batch bubble columns. Focus was put on the feasibility of the process for high COD removal and on its operational procedure. For both wastewaters, a rapid formation of aerobic granules is observed along with a high COD removal rate. Granule characteristics are quite similar with respect to the two types of wastewater. It seems that filamentous bacteria are part of the granule structure and that phosphorus precipitation can play an important role in granule formation. For both wastewaters similar removal performances for dissolved biodegradable COD are observed (> 95%). However, a relatively high concentration of suspended solids in the outlet deteriorates the performance with regard to total COD removal. Biomass detachment seems to play a non-negligible role in the current set-up. After a stable operational phase the variation of the pharmaceutical wastewater caused a destabilisation and loss of the granules, despite the control for balanced nutrient supply. The first results with real industrial wastewater demonstrate the feasibility of this innovative process. However, special attention has to be paid to the critical aspects such as granule stability as well as the economic competitiveness, which both will need further investigation and evaluation.

Removal of Organic Pollutants from Reverse Osmosis Concentrate by Electro-Fenton Process

2014 ◽  
Vol 955-959 ◽  
pp. 2294-2299 ◽  
Author(s):  
Hui Ling Du ◽  
Bao Yuan Pan ◽  
Jing Li
Keyword(s):  
Organic Pollutants ◽  
Pulse Generator ◽  
Treatment Time ◽  
Removal Rate ◽  
High Voltage Pulse ◽  
Aeration Rate ◽  
Cod Removal ◽  
Fenton Process ◽  
Voltage Pulse Generator ◽  
Cod Removal Rate

The RO concentrate containing non-degradation organic pollutants was treated by electro-Fenton process. The high voltage pulse generator was used as discharge power. The effects of pulsed electric field parameters, aeration rate and pH on COD removal rate was investigated. The results indicate that the COD removal rate is up to 80.71% when pulsed voltage, pulsed frequency, treatment time, aeration rate and pH are 30000 V, 5 Hz, 240 s, 1.0 m3/h and 10, respectively.

Isolation and Characterization of a Bacillus flexus Strain Used in Alkaline Wastewater Treatment

2013 ◽  
Vol 750-752 ◽  
pp. 1381-1384 ◽  
Author(s):  
Xi Wang ◽  
Hua Zhao
Keyword(s):  
Biological Treatment ◽  
Removal Rate ◽  
Cod Removal ◽  
Optimal Conditions ◽  
Rdna Sequences ◽  
Isolation And Characterization ◽  
Bacillus Flexus ◽  
16S Rdna Sequences ◽  
Cod Removal Rate

Biological treatment is one of the considerable choices for removing of organic pollutants present in petrochemical wastewaters. In this study, BS5, the isolate with the highest COD removal rate, was identified asBacillus flexus, based on 16S rDNA sequences. Subsequently, the optimized COD removal conditions of BS5 were investigated. It was indicated that the optimal conditions were 35°C, pH 7.5. Under such circumstance, the removal rate of COD can reach 81.04%. The isolation ofBacillus flexusstrain BS5 provided an alternative for the bioremediation of alkaline wastewater. Lastly, the study showed that consecutive disposal process may help to reducing COD of wastewater effectively.

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.

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%.

Sign in / Sign up

Export Citation Format

Share Document