Papers by Author: Ying Hong Xiang

Abstract: The radioactive organics in wastewater were removed by Fenton reagent. The optimum conditions determined by single-factor test and orthogonal experiment are as following: [H₂O₂] =1.0mol·L^-1, [Fe²⁺] =6.00mmol·L^-1 and 30min at pH=4.0. Under these conditions, the COD removal efficiency was 81%. The dosage of Fe²⁺ was the most influential factor on organic wastewater COD removal by Fenton and the following influential factors were the reaction time, H₂O₂ dosage and pH value. In the process of radioactive wastewater treatment by Fenton, the effect of molten iron complexes flocculation was bigger than hydroxyl radical oxidation on COD removal.

Abstract: The organic compounds in radioactive wastewater were treated using ozone oxidation technology. The influence of pH, ozone dosage, reaction time, initial COD, H₂O₂ on the removal of COD by ozone was investigated. The results showed that the removal efficiency of COD in the alkaline condition was higher than that of acidic condition, the COD removal rate increased with increasing ozone dosage, reaction time, H₂O₂ dosage, decreased with increasing initial COD. Under the conditions of COD 362 mg/L, pH value 9.0, ozone dosage 7.86 mg•L^-1•min^-1, reaction time 30 min , the removal rate of COD was 25.9%; the removal rate of COD increased to 37.8% when 0.2 ml H₂O₂ was added in addition.

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.