Electrochemical oxidation technology to treat textile wastewaters

2021 ◽  
pp. 100806
Author(s):  
Oscar M. Rodríguez-Narváez ◽  
Alain R. Picos ◽  
Nelson Bravo-Yum ◽  
Martín Pacheco-Alvarez ◽  
Carlos A. Martínez-Huitle ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Oxidation Technology ◽  
Textile Wastewaters

Electrochemical Oxidation of Perfluorooctanesulfonate by Magnéli Phase Ti4O7 Electrode in the Presence of Trichloroethylene

2020 ◽  
Vol 1 (4) ◽  
Author(s):  
Peizeng Yang ◽  
Yaye Wang ◽  
Junhe Lu ◽  
Viktor Tishchenko ◽  
Qingguo Huang ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Current Density ◽  
First Order ◽  
Degradation Rates ◽  
Oxidation Technology ◽  
Magnéli Phase ◽  
Polyfluoroalkyl Substances ◽  
Titanium Suboxide ◽  
Gas Tight ◽  
Magneli Phase

This study examined the degradation of perfluorooctanesulfonate (PFOS) in electrochemical oxidation (EO) processes in the presence of trichloroethylene (TCE). The EO experiment was performed in a gas-tight reactor using Magnéli phase titanium suboxide (Ti4O7) as the anode. The experimental data demonstrated that 75% of PFOS (2 μM) was degraded at 10 mA/cm2 current density in 30 min without TCE present in the solution, while the presence of 76 μM TCE apparently inhibited the degradation of PFOS, reducing its removal down to 53%. Defluorination ratio suggested that PFOS was significantly mineralized upon EO treatment, and it appeared to be not influenced by the presence of TCE. The respective pseudo-first order rate constants (kobs) of PFOS removal were 0.0471 and 0.0254 min-1 in the absence and presence of TCE. The degradation rates of both PFOS and TCE increased with current density rising from 2.5 to 20 mA/cm2. In the presence of TCE, chloride, chlorate, and perchlorate were formed that accounted for 79.7 %, 5.53%, and 1.51% of the total chlorine at 60 min. This work illustrates the promise of the Magnéli phase Ti4O7 electrode based electrochemical oxidation technology for degrading per- and polyfluoroalkyl substances (PFASs) and co-contaminants in groundwaters.

Electrochemical treatment of mature landfill leachate using Ti/RuO2–IrO2 and Al electrode: optimization and mechanism

RSC Advances ◽  
2016 ◽  
Vol 6 (53) ◽  
pp. 47509-47519 ◽  
Author(s):  
Juan Li ◽  
Zhao-hui Yang ◽  
Hai-yin Xu ◽  
Pei-pei Song ◽  
Jing Huang ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Landfill Leachate ◽  
Electrochemical Treatment ◽  
Oxidation Technology ◽  
Mature Landfill Leachate

Today, improving the elimination of refractory pollutants in landfill leachate through electrochemical oxidation technology has attracted considerable attention.

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.

Electrochemical oxidation of COD from real textile wastewaters: Kinetic study and energy consumption

Chemosphere ◽  
2017 ◽  
Vol 171 ◽  
pp. 332-338 ◽  
Author(s):  
Jiaxiu Zou ◽  
Xiaolan Peng ◽  
Miao Li ◽  
Ying Xiong ◽  
Bing Wang ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Kinetic Study ◽  
Electrochemical Oxidation ◽  
Textile Wastewaters

Reduction Efficacy of Activated Sludge by Electrochemical Oxidation

2012 ◽  
Vol 610-613 ◽  
pp. 2255-2258 ◽  
Author(s):  
Li Wang ◽  
Chun Mei Li ◽  
Xiao Song Li ◽  
Li Jie Wang
Keyword(s):  
Activated Sludge ◽  
Electrochemical Oxidation ◽  
Operation Time ◽  
Cell Lysis ◽  
Clean Technology ◽  
Activated Sludge Process ◽  
Electrolysis Time ◽  
Oxidation Technology ◽  
Sludge Production

As the electrochemical oxidation technology is an effective and reliable clean technology, in this study the electrochemical oxidation activated sludge process was developed, in which the electrolysis reactor with homocentric circle arrangement electrode was installed, with Ti/RuO2 being used as reticular plates. The results showed that the electrochemical oxidation can reduce activated sludge production substantially. The lysis efficiency of activated sludge achieved was 29.98% in the experiment under the optimal oxidation conditions as follows: pH=12, 60 min of intermittent electrolysis time, working voltage of 6 V and initial VSS concentration of 4670 mg·L-1,while the SCOD and TP being released from cell lysis at the maximum of 712.2 and 33 mg·L-1 respectively; and the NH3-N also reached the maximum and presented a declining trend with operation time?, which showed that this conditions were the best for electrolysis oxidation of activated sludge.

Degradation of Landfill Leachate by Combined Three-Dimensional Electrode and Electro-Fenton

2011 ◽  
Vol 347-353 ◽  
pp. 440-443 ◽  
Author(s):  
Yan Shi ◽  
Hai Chen Yu ◽  
Dan Yu Xu ◽  
Xian Qiang Zheng
Keyword(s):  
Reaction Mechanism ◽  
Electrochemical Oxidation ◽  
Landfill Leachate ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Optimal Operating ◽  
Oxidation Technology ◽  
Iron Anode ◽  
Removal Efficiencies

Three-dimensional-electrode electro-Fenton is a newly electrochemical oxidation technology to treat landfill leachate. In contrast, the removal efficiencies of COD and color in DSA system are obviously higher than those in iron anode system and the organics can be degraded more thoroughly. Under the optimal operating conditions, the removal efficiencies of COD, NH3-N and color in landfill leachate by DSA system are up to 80.8% ,55.2% and 98.6％. Besides, the reaction mechanism of three-dimensional-electrode electro-Fenton is also discussed.

SYNTHETIC TEXTILE WASTEWATERS TREATMENT BY COAGULATION/FLOCCULATION USING FERRIC SALT AS COAGULANT

2017 ◽  
Vol 16 (9) ◽  
pp. 1881-1889 ◽  
Author(s):  
Rui A.R. Boaventura ◽  
Carmen S.D. Rodrigues ◽  
Luis M. Madeira
Keyword(s):  
Ferric Salt ◽  
Wastewaters Treatment ◽  
Textile Wastewaters
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