Papers by Keyword: UV/Fenton

Abstract: Nowadays, ultraviolet (UV) irradiation heterogeneous Fenton-like reactions have widespread used in organic wastewater treatment. In this paper, Fe²⁺ and Cu²⁺ were load in Na-Y molecular sieve using impregnation method. Fe-Y, Cu-Y and Fe-Cu-Y catalysts were obtained. The Fe-Cu-Y catalyst showed good performance in the degradation of 6-nitryl wastewater. When the volume of 6-nitryl wastewater is 100 mL, the optimal reaction conditions were found to be 3mL of hydrogen peroxide, 7.5g of catalyst weight, 250W of UV power. Under these conditions, the degradation rate of COD_Cr can be up to 97.0%.

Abstract: The spent fuel can be treated by solvent extraction. In the process of extraction, the performance of the extraction will be serious deterioration by the effect of radioactive radiation, chemical reaction, light and heat, it will be a new waste and harm human being and pollute environment seriously. In this paper, four different advanced oxidation processes (UV/H2O2,UV/Fenton,O3 and O3/Fenton)were used to treat the wastewater containing extractant. All of these four methods, at presumed conditions, could result in high COD removal efficiencies, and the removal rate of COD reached 80% or above when the wastewater was treated 3 hours.When the wastewater was treated by pretreatment/O3/Fenton, the COD and removal efficiency of the effluent were 247mg/L,94.5% respectively, at the O3 dose of 1000 mg/L with 72 ml/L H2O2.

Abstract: In this paper, the effects of organic acid radicals on degradation of Orange II in UV-Fenton system with hydroxyl-Fe-pillared bentonite as catalyst were studied in detail. The results showed that the rate constants of UV-Fenton reaction will decrease when the system contains sodium citrate or sodium malonate. While the rate of Orange II degradation in UV-Fenton system could increase up to 33.3% and 41.7% when EDTA and sodium oxalate were present, respectively. As the additional TOC of EDTA is higher than sodium oxalate, adding sodium oxalate is a more promising enhanced method for Orange II degradation in UV-Fenton system. The rate of Orange II degradation could increase 25%, 42% and 175% when the concentrations of additional sodium oxalate increased up to 0.1 mM, 0.2 mM and 0.4 mM, respectively.

Abstract: In this paper, degradation of Orange II by homogeneous UV-Fenton process with low concentration of Fe3+ as catalyst was detected. And the effects of UV light wavelength, initial pH and reaction temperature on degradation of Orange II in homogeneous UV-Fenton system were studied in detail. It was found that the arithmetic sum of the rate constants of dye degradation in Fenton and UV-H2O2 and UV was much lower than that in UV-Fenton system with low concentration of Fe3+ as catalyst. The result showed that using low concentration of metallic salts as homogeneous catalyst would be a good alternative in UV-Fenton system for wastewater treatment.