Indirect Anodic Oxidation Applied for the Treatment of Simulated Wastewater Containing Reactive Dyes

2012 ◽  
Vol 599 ◽  
pp. 344-347
Author(s):  
Bo Yang ◽  
Dan Du ◽  
Hui Xie ◽  
Ye Sun
Keyword(s):  
Anodic Oxidation ◽  
Ph Value ◽  
Removal Rate ◽  
Reactive Dyes ◽  
Electrolysis Time ◽  
Removal Rates ◽  
Decolorization Rate ◽  
Simulated Wastewater ◽  
Reactive Orange

The treatment of simulated wastewater containing reactive dyes was carried out by indirect anodic oxidation with Ti/IrO2 electrode. The influences of pH value, voltage, electrolysis time and NaCl dosage on the degradation performance were studied. The results show that under the condition (pH=3, voltage=20V, NaCl=2.5g/L), for reactive orange X-GN and yellow X-R, their solutions almost complete bleach after being treated for 30 min, and the removal rates of COD is 68% after being treated for 60 min; for reactive black KN-B, decolorization rate is up to 100% and the removal rate of COD reaches 60% after being treated for 60 min.

Removal of Ammonia Nitrogen by Combining the Ammonia Stripping with Electrochemical Oxidation

2013 ◽  
Vol 664 ◽  
pp. 454-457
Author(s):  
Xiu Juan Yu ◽  
Li Hong Ning
Keyword(s):  
Synergistic Effect ◽  
Electrochemical Oxidation ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Ammonia Removal ◽  
Electrolysis Time ◽  
Removal Rates ◽  
Ammonia Stripping ◽  
Oxidation Technology ◽  
Simulated Wastewater

The removal of ammonia nitrogen in simulated wastewater with 90mg/L NH4Cl was researched by ammonia stripping, electrochemical oxidation and the combination of the ammonia stripping and electrochemical oxidation. It is shown that the reduction of ammonia is enlarged with increasing of wastewater’s alkalinity during stripping. And the removal rates of ammonia nitrogen are 2.1% at pH2 and 43.1% at pH7 which is not related to the stripping time. The ammonia removal is higher efficiency in pH12 which is in the range of 45.1% and 61.4% when the stripping time is changed from 40 to 100 min. The removal rate of ammonia nitrogen is increased with the extension of electrolysis time by the way of the electrochemical oxidation. For 100min electrolysis, the ammonia removal in the cathodic and anodic compartments are 55.8% and 86.9%, respectively. Moreover, by using the ammonia stripping and electrochemical oxidation simultaneously, the ammonia removal in the cathodic and anodic compartments are up to 91.8% and 99.8% for 100min, respectively. The combining of the ammonia stripping with electrochemical oxidation technology has obviously synergistic effect in purifying ammonia nitrogen wastewater.

scholarly journals Indirect anodic oxidation applied for treatment of simulated wastewater containing Cationic Red X-GRL and Disperse Red 3B

2016 ◽  
Vol 7 (2) ◽  
pp. 197-204
Author(s):  
Bo Yang ◽  
Yue Xiang Li ◽  
Jiao Song
Keyword(s):  
Anodic Oxidation ◽  
Ph Value ◽  
Oxygen Demand ◽  
Electrolysis Time ◽  
Single Factor ◽  
Chemical Oxygen Demand Removal ◽  
Ring Structures ◽  
Simulated Wastewater ◽  
Single Factor Experiment ◽  
Dyes Degradation

The treatment of simulated wastewater containing Cationic Red X-GRL (X-GRL) or Disperse Red 3B (DR-3B) dye was carried out by indirect anodic oxidation, using Ti/SnO2 electrodes as the anode. The influences of pH value, voltage, electrolysis time and sodium chloride dosage on the degradation performance were studied by single factor experiment. Furthermore the nitrogen states and UV-Vis spectra in dyes degradation were analyzed. The results showed that under the optimum condition (pH = 3, voltage = 20 V, NaCl = 2.5 g/L), the decolorization and chemical oxygen demand removal of X-GRL were 98% and 67%, respectively; and those of DR-3B were 51% and 61%, respectively. The azo double bond conjugated system in X-GRL is much more easily destroyed than the anthraquinone conjugated system in DR-3B; the aryl ring structures of them can be partially degraded.

The Study on the Treatment of Nitrobenzene Wastewater by Heterogenious Catalysts and Electrode Oxidation

2013 ◽  
Vol 668 ◽  
pp. 140-144
Author(s):  
Su Leng ◽  
Rui Yang Chen ◽  
Song Yue Chen ◽  
Miao Liu
Keyword(s):  
Catalytic Oxidation ◽  
Catalytic Properties ◽  
Ph Value ◽  
Removal Rate ◽  
The Self ◽  
Electrolysis Time ◽  
Oxidation Technology ◽  
Electro Catalytic Oxidation ◽  
La Doped ◽  
Reaction Speed

In the paper, the PbO2-Ti electrodes were characterized by SEM, and introduce the self-made catalyst Fe3+/TiO2 into the electrolytic system to treat the nitrobenzene wastewater, in order to improve the reaction speed and the removal rate of COD and NB and form heterogeneous electro-catalytic oxidation technology. In order to confirm the best removal efficiency of COD and NB, the experiment will study the electrolysis time, current intensity, pH value, and the amount of catalyst. The experimental results showed that the surface of La-doped electrode was dense and had good electro-catalytic properties.

Adsorption of rhodamine B and Cr3+ ion onto graphene/chitosan composite

2020 ◽  
pp. 1-12
Author(s):  
Yanji Li ◽  
Meng Ni ◽  
Qiang He ◽  
Xiang Li ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Rhodamine B ◽  
Ph Value ◽  
Removal Rate ◽  
Ion Concentration ◽  
Particle Diffusion ◽  
Solution Ph ◽  
Magnetic Chitosan ◽  
Correlation Degree ◽  
Simulated Wastewater

Graphene and chitosan acted as the adsorbents for simulated wastewater with rhodamine B. The novel material produced by freeze-drying obviously outperformed graphene and chitosan in treating rhodamine B. Factors (e.g., contaminant concentration, reaction time, solution pH value, adsorption dose and temperature) overall impacted the adsorption. The optimal conditions for graphene-chitosan treatment of dyes included the concentration of pollutants at 400 mg/L, the dose of adsorbent as 5 mg, the solution pH at 4 and at 25∘C, and for 12 h, in which the maximal treatment amount reached 858.00 mg/g. The adsorption processes of Chitosan/graphene composites and magnetic Chitosan/graphene composites for simulated wastewater from Rhodamine B reactor followed Langmuir and Freundlich models, respectively. The in-particle diffusion model shows that the adsorption process of the composites for Rhodamine B simulated wastewater is not determined by either surface diffusion or in-particle diffusion. The magnetic Chitosan/graphene composites exhibit high recyclability, which can be respectively reused 3 times and 5 times and retain 80% adsorption capacity after being administrated with Rhodamine B simulated wastewater. By analyzing grey correlation degree, it is demonstrated that the concentration of pollutants and the reaction temperature critically affect the adsorption capacity. The electrochemical treatment with graphite rod for the Cr3+ was under the initial voltage of 30.6 V, at the pH of 5.59, and at the temperature of 18.5∘C; the removal rate of the samples was nearly 62.35% with the chromium ion concentration declined from 0.3333 g/L to 0.1255 g/L.

Treatment of Simulated Wastewater Containing Chlorobenzene by Iron-Carbon Micro-Electrolysis Packing

2010 ◽  
Vol 113-116 ◽  
pp. 176-180 ◽  
Author(s):  
Meng Li ◽  
Dong Lei Zou ◽  
Hao Chen Zou ◽  
Dong Yan Fan
Keyword(s):  
Activated Carbon ◽  
Ph Value ◽  
Raw Materials ◽  
Removal Rate ◽  
Reaction Rates ◽  
First Order ◽  
First Order Kinetics ◽  
Low Degree ◽  
Simulated Wastewater ◽  
Pseudo First Order

Using iron filings, activated carbon power and clay as raw materials, the granular iron-carbon micro-electrolysis packing was made by the method of calcination. The influence of initial chlorobenzene (CB) concentration, pH value and reaction temperature on the removal rate of simulated wastewater containing CB were investigated. The results showed that the reaction followed the pseudo-first-order kinetics model and the rate constants varied at a relatively low degree at various pH. Temperature is an important parameter and an increase in temperature could significantly raise the reaction rates. The column packed with packing was designed to remove CB in wastewater. After running for 70 days, the packing still had good performance and there was no obvious decrease on the removal rate.

Study on Laccase Immobilization with PVA Materials

2011 ◽  
Vol 287-290 ◽  
pp. 1943-1946
Author(s):  
Fei Du ◽  
Zhi Jiang Li ◽  
An Long Zhang ◽  
Qiang Qi
Keyword(s):  
Mass Fraction ◽  
Ph Value ◽  
Removal Rate ◽  
Treatment Method ◽  
Advanced Treatment ◽  
Optimum Conditions ◽  
Crosslinking Degree ◽  
Decolorization Rate ◽  
Chemical Pulp ◽  
Laccase Immobilization

This article used glutaraldehyde to immobilize laccase and then used the immobilization laccase to treatment papermaking effluent. The study first discussed the effect of PVA crosslinking degree, epoxidation temperature and epoxidation time for the performance of PVA carrier. The research found 100g PVA ( mass fraction is 10%), 35mL glutaraldehyde, 10mL DMSO and 10mL epoxy chloropropane reacted 6h in 60 °C, pH=11-12 and surface amount of epoxidation reached the max value. its amount is 0.3073mmol . And then the laccase were fixed with the max value. The optimum conditions of immobilization laccase treated papermaking effluent were researched. The effects of treated time, temperature, pH value, the dosage of enzyme and HBT, the removal value of CODCr and decolorization were tested. The effects of treated time, temperature, pH value, the dosage of enzyme and HBT, concentration of Cu2+ on the removal value of CODCr and decolorization were tested. It was found that the optimum conditions for immobilization laccase treatment were Cu2+ 0.006μmol/L, HBT 0.008g/L, pH=4, temperature 50°C, reation time 6h (with air injected). The result showed that the CODCr removal rate reached 63.15%, the decolorization rate reached 61.53% in 8h. Furthermore BOD/COD of chemical pulp effluent was increased from 0.17 to 0.455. Comparing with dissociation laccase, stabilities of immobilization laccase for hot and pH increased. Through this research a new advanced treatment method can be found. This method can improve biodegradation performance of papermaking effluent. Papermaking effluent treated by aerobic, anaerobic and laccase system will achieve standard discharge.

On the performances of lead dioxide and boron-doped diamond electrodes in the anodic oxidation of simulated wastewater containing the Reactive Orange 16 dye

2009 ◽  
Vol 54 (7) ◽  
pp. 2024-2030 ◽  
Author(s):  
Leonardo S. Andrade ◽  
Thiago T. Tasso ◽  
Diogo L. da Silva ◽  
Romeu C. Rocha-Filho ◽  
Nerilso Bocchi ◽  
...  
Keyword(s):  
Anodic Oxidation ◽  
Lead Dioxide ◽  
Diamond Electrodes ◽  
Boron Doped Diamond ◽  
Reactive Orange 16 ◽  
Boron Doped ◽  
Simulated Wastewater ◽  
Reactive Orange

Analysis of organic removal rates in the aerated submerged fixed film process

1998 ◽  
Vol 38 (8-9) ◽  
pp. 213-221 ◽  
Author(s):  
Mohamed F. Hamoda ◽  
Ibrahim A. Al-Ghusain
Keyword(s):  
Pilot Plant ◽  
Removal Rate ◽  
Domestic Wastewater ◽  
Removal Rates ◽  
Hydraulic Loading ◽  
Organic Removal ◽  
Wide Range ◽  
Fixed Film ◽  
Cod Removal Rate ◽  
And Performance

Performance data from a pilot-plant employing the four-stage aerated submerged fixed film (ASFF) process treating domestic wastewater were analyzed to examine the organic removal rates. The process has shown high BOD removal efficiencies (> 90%) over a wide range of hydraulic loading rates (0.04 to 0.68 m3/m2·d). It could also cope with high hydraulic and organic loadings with minimal loss in efficiency due to the large amount of immobilized biomass attained. The organic (BOD and COD) removal rate was influenced by the hydraulic loadings applied, but organic removal rates of up to 104 kg BOD/ m2·d were obtained at a hydraulic loading rate of 0.68 m3/m2·d. A Semi-empirical model for the bio-oxidation of organics in the ASFF process has been formulated and rate constants were calculated based on statistical analysis of pilot-plant data. The relationships obtained are very useful for analyzing the design and performance of the ASFF process and a variety of attached growth processes.

The comparison of trichloroethylene removal rates by methane- and aromatic-utilizing microorganisms

1998 ◽  
Vol 38 (7) ◽  
pp. 19-24 ◽  
Author(s):  
C.-J. Lu ◽  
C. M. Lee ◽  
M.-S. Chung
Keyword(s):  
Cell Concentration ◽  
Removal Rate ◽  
Carbon Sources ◽  
Batch Reactors ◽  
Initial Cell Concentration ◽  
Removal Rates ◽  
Initial Cell ◽  
Toluene Concentration ◽  
Cell Source ◽  
Removal Efficiencies

The comparison of TCE cometabolic removal by methane, toluene, and phenol utilizers was conducted with a series of batch reactors. Methane, toluene, or phenol enriched microorganisms were used as cell source. The initial cell concentration was about 107 cfu/mL. Methane, toluene, and phenol could be readily biodegraded resulting in the cometabolic removal of TCE. Among the three primary carbon sources studied, the presence of phenol provided the best cometabolic removal of TCE. When the concentration of carbon source was 3 mg-C/L, the initial TCE removal rates initiated by methane, toluene, and phenol utilizers were 1.5, 30, and 100 μg/L-hr, respectively. During the incubation period of 80 hours, TCE removal efficiencies were 26% and 96% with the presence of methane and toluene, respectively. However, it was 100% within 20 hours with the presence of phenol. For phenol utilizers, the initial TCE removal rates were about the same, when the phenol concentrations were 1.35, 2.7, and 4.5 mg/L. However, TCE removal was not proportional to the concentrations of phenol. TCE removal was hindered when the phenol concentration was higher than 4.5 mg/L because of the rapid depletion of dissolved oxygen. The presence of toluene also initiated cometabolic removal of TCE. The presence of toluene at 3 and 5 mg/L resulted in similar TCE removal. The initial TCE removal rate was about 95 μg/L-hr at toluene concentrations of 3 and 5 mg/L compared to 20 μg/L-hr at toluene concentration of 1 mg/L.

Relations between carbon removal rates, biofilm size and density of a novel anaerobic reactor: the inverse turbulent bed

2000 ◽  
Vol 41 (4-5) ◽  
pp. 253-260 ◽  
Author(s):  
P. Buffière ◽  
R. Moletta
Keyword(s):  
Removal Rate ◽  
Removal Rates ◽  
Carbon Removal ◽  
Biofilm Growth ◽  
Loading Rates ◽  
Biomass Activity ◽  
High Turbulence ◽  
The One ◽  
High Level ◽  
Very High

An anaerobic inverse turbulent bed, in which the biogas only ensures fluidisation of floating carrier particles, was investigated for carbon removal kinetics and for biofilm growth and detachment. The range of operation of the reactor was kept within 5 and 30 kgCOD· m−3· d−1, with Hydraulic Retention Times between 0.28 and 1 day. The carbon removal efficiency remained between 70 and 85%. Biofilm size were rather low (between 5 and 30 μm) while biofilm density reached very high values (over 80 kgVS· m−3). The biofilm size and density varied with increasing carbon removal rates with opposite trends; as biofilm size increases, its density decreases. On the one hand, biomass activity within the reactor was kept at a high level, (between 0.23 and 0.75 kgTOC· kgVS· d−1, i.e. between 0.6 and 1.85 kgCOD·kgVS · d−1).This result indicates that high turbulence and shear may favour growth of thin, dense and active biofilms. It is thus an interesting tool for biomass control. On the other hand, volatile solid detachment increases quasi linearly with carbon removal rate and the total amount of solid in the reactor levels off at high OLR. This means that detachment could be a limit of the process at higher organic loading rates.

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