Redirigiendo al acceso original de articulo en 20 segundos...
ARTÍCULO
TITULO

Photocatalytic Oxidation Process (UV/H2O2/ZnO) in the treatment and sterilization of dairy wastewater - doi: 10.4025/actascitechnol.v35i1.11132

Priscila de Abreu    
Erlon Lopes Pereira    
Cláudio Milton Montenegro Campos    
Fabiano Luiz Naves    

Resumen

Advanced Oxidation Processes (AOP) have attracted much interest of scientific and industrial communities. Therefore, this process was employed experimentally to determine its efficacy in treating dairy effluents. For this, it was employed an artificial light reactor using photolysis (UV), hydrogen peroxide (H2O2) as an oxidant, and zinc oxide (ZnO) as an alternative catalyst. The variables studied in the photocatalysis were: H2O2, ZnO, under different values of pH, both in relation to the interferences with the reaction rate and with the process efficiency. First order differential equations were applied in determining the degradation rate over the hydraulic retention time (HRT); the F-test and the signal: noise ratio comparison were used to test the significance of variables. The AOP using photolysis UV, H2O2 and ZnO was effective in COD removal with 80% efficiency. As for the sterilization, in terms of total and fecal coliforms the efficiency was 100%, with the most probable number of total and fecal coliforms (MPN 100 mL-1) equal to zero. A catalyst/oxidant/pH ratio was observed at 1 g  30 mL-1 4-1 for a better kinetic-chemical reaction, for 1 hour lighting.  

 Artículos similares

       
 
Jong-Won Lee and Cheolmin Baek    
Nitrogen oxide (NOx), emitted at the highest rate among automobile exhaust gases, is the main cause of air pollution, and various construction technologies are being developed to reduce NOx emissions. In this study, the NOx reduction effect of surface tr... ver más
Revista: Applied Sciences

 
João Gomes, João Lincho, Eva Domingues, Rosa M. Quinta-Ferreira and Rui C. Martins    
Titanium dioxide is the most used photocatalyst in wastewater treatment; its semiconductor capacity allows the indirect production of reactive oxidative species. The main drawback of the application of TiO2 is related to its high band-gap energy. The non... ver más
Revista: Water

 
Xinhan Chen, Zhen Hu, Yijin Zhang, Linlan Zhuang, Jian Zhang, Jing Li and Hongying Hu    
It is widely believed that constructed wetlands (CWs) own great potentiality as polishing wastewater treatment methods for removing carbamazepine (CBZ). Although the typical CBZ removal efficiencies in CWs are quite low, the CBZ removal performance could... ver más
Revista: Water

 
Haithem Bel Hadjltaief, Ali Sdiri, María Elena Gálvez, Haythem Zidi, Patrick Da Costa and Mourad Ben Zina    
This paper describes a simple and low-cost process for the degradation of 4-Chlorophenol (4-CP) from aqueous solution, using natural Tunisian Hematite (M1) and Siderite (M2). Two natural samples were collected in the outcroppings of the Djerissa mining s... ver más
Revista: ChemEngineering

 
Yun Lu, Sujun Guan, Liang Hao and Hiroyuki Yoshida    
This review presents the latest results of studies directed at photocatalyst coatings of titanium dioxide (TiO2) prepared by mechanical coating technique (MCT) and its application. Compared with traditional coating techniques, MCT is a simple, low cost a... ver más
Revista: Coatings