Electrochemical Oxidation and Advanced Oxidation Processes Using 3D Hexagonal Co3O4 Arrays Anode for 4-Nitrophenol Decomposition Coupled with Simultaneous CO2 Conversion to Liquid Fuels Via Flower-like CuO Cathode

2009 ◽  
Vol 164 (1) ◽  
pp. 120-125 ◽  
Author(s):  
P. Cañizares ◽  
M. Hernández-Ortega ◽  
M.A. Rodrigo ◽  
C.E. Barrera-Díaz ◽  
G. Roa-Morales ◽  
...  

Author(s):  
Victor Odhiambo Shikuku ◽  
Wilfrida N. Nyairo

Advanced oxidation processes (AOPs), namely the Fenton oxidation, ozonation, electrochemical oxidation, and photocatalysis, are potential alternative techniques for dye removal from textile effluents. Their inherent ability to completely mineralize pollutants including those recalcitrant to biodegradation and to be compatibly integrated in conventional technologies present grounds for consideration of AOPs as alternative wastewater treatment options. Advanced oxidation involves generation and subsequent reaction of various radicals and reacting species with the target compounds. This chapter discusses the fundamentals and chemistry and efficiencies of the Fenton process, ozonation, electrochemical oxidation, and photocatalysis processes for complete dye removal from wastewater. The reaction mechanisms, performance, and factors affecting efficiency are discussed.


2009 ◽  
Vol 60 (11) ◽  
pp. 2991-2999 ◽  
Author(s):  
Chu Yan-yang ◽  
Qian Yi ◽  
Bai Mao-juan

A new advanced oxidation processes: electrochemical oxidation with iron promoting (EOIP) was presented and the treatment of an actual industrial wastewater from acrylonitrile production by three advanced oxidation processes (AOPs) has been studied: Fenton oxidation (FO), electro-Fenton oxidation (EFO), and electrochemical oxidation with iron promoting (EOIP). It was found that all the three processes were able to treat this wastewater, but different results in terms of efficiency and different behaviors were obtained. When the same dosage of H2O2 was added to the wastewater, the oxidation power of three AOPs increased in the order: FO < EFO < EOIP. Under the condition of higher dosage of H2O2, the three AOPs applied could achieve the better color removal. When the dosage of H2O2 was lower than 1,500 mg l−1, the color of the wastewater after treated increased from FO and EFO due to the formation of Fe (III) complexes, but this was not found in EOIP. The results of this work indicate that EOIP is a promising alternative for COD and color removal from organic wastewater.


2014 ◽  
Vol 140 ◽  
pp. 427-433 ◽  
Author(s):  
Ricardo E. Palma-Goyes ◽  
Javier Silva-Agredo ◽  
Ignacio González ◽  
Ricardo A. Torres-Palma

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1043 ◽  
Author(s):  
Khanh Chau Dao ◽  
Chih-Chi Yang ◽  
Ku-Fan Chen ◽  
Yung-Pin Tsai

Due to various potential toxicological threats to living organisms even at low concentrations, pharmaceuticals and personal care products in natural water are seen as an emerging environmental issue. The low efficiency of removal of pharmaceuticals and personal care products by conventional wastewater treatment plants calls for more efficient technology. Research on advanced oxidation processes has recently become a hot topic as it has been shown that these technologies can effectively oxidize most organic contaminants to inorganic carbon through mineralization. Among the advanced oxidation processes, the electrochemical advanced oxidation processes and, in general, electrochemical oxidation or anodic oxidation have shown good prospects at the lab-scale for the elimination of contamination caused by the presence of residual pharmaceuticals and personal care products in aqueous systems. This paper reviewed the effectiveness of electrochemical oxidation in removing pharmaceuticals and personal care products from liquid solutions, alone or in combination with other treatment processes, in the last 10 years. Reactor designs and configurations, electrode materials, operational factors (initial concentration, supporting electrolytes, current density, temperature, pH, stirring rate, electrode spacing, and fluid velocity) were also investigated.


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