1. 标题：Mineralization of sucralose by UV-based advanced oxidation processes: UV/PDS versus UV/H2O2作者：Xu, Yin; Lin, Ziyan; Zhang, Hui
来源出版物：CHEMICAL ENGINEERING JOURNAL 卷：285 页：392-401 DOI：10.1016/j.cej.2015.09.091 出版年：FEB 1 2016
摘要：Mineralization of sucralose (SUC) in water by UV-based photolysis processes (i.e., direct UV, UV/peroxydisulfate (PDS) and UV/H2O2) was explored in this work. The effects of oxidant concentration, initial sucralose concentration and pH on TOC removal were investigated. The results indicated that the mineralization of sucralose increased with higher concentrations of oxidant and decreased with the increase of initial sucralose concentration and it is reported that the UV/PDS system can completely mineralize SUC after 60 min using a 30-fold excess of oxidant over SUC molar concentration. Raising the solution pH from 3 to 11 inhibited the mineralization of SUC slightly in the UV/PDS process, while the mineralization rate increased from pH 3 to 7 and decreased in alkaline conditions in the UV/H2O2 process. TOC removal of 2%, 70% and 93% of sucralose (initial concentration 0.126 mM) were achieved in 60 min by the UV, UV/H2O2 and UV/PDS processes, respectively, when 2.520 mM oxidants were used at neutral pH. Different inorganic anions were found to have an effect on the efficiency of these UV-based AOPs in the order NO2- > NO3- > Cl-. Contrary to previous work, where the presence of NO2- almost completely inhibited the mineralization of SUC by UV-based AOPs systems, it has been found that the mineralization rates decreased dramatically to 0.0005 min(-1), especially when the concentration of NO2- exceed 1 mM. Toxicity tests with activated sludge investigated the efficiency of the UV-based AOPs on the detoxification of the solutions as the oxidation proceeded.
入藏号：WOS:000366618800043
文献类型：Article
语种：English
作者关键词：Sucralose (SUC), Ultraviolet (UV-C), Hydrogen peroxide, Peroxydisulfate, Advanced oxidation processes (AOPs), Mineralization
扩展关键词：ARTIFICIAL SWEETENER SUCRALOSE; ENHANCED HETEROGENEOUS ACTIVATION; ACID ORANGE 7; AQUEOUS-SOLUTION; DRINKING-WATER; PHOTOCATALYTIC DEGRADATION; PHOTOCHEMICAL DEGRADATION; FE-CO/SBA-15 CATALYST; ORGANIC CONTAMINANTS; HYDROGEN PEROXIDE
通讯作者地址：Zhang, Hui; Wuhan Univ, Dept Environm Engn, Wuhan 430079, Peoples R China.
电子邮件地址：eeng@whu.edu.cn
地址： [Xu, Yin; Lin, Ziyan; Zhang, Hui]Wuhan Univ, Dept Environm Engn, Wuhan 430079, Peoples R China.
2. 标题：Treatment of landfill leachate using electrochemically assisted UV/chlorine process: Effect of operating conditions, molecular weight distribution and fluorescence EEM-PARAFAC analysis作者：Ye, Zhihong; Zhang, Hui; Zhang, Xin; Zhou, Dejian
来源出版物：CHEMICAL ENGINEERING JOURNAL卷：286 期： 页：508-516 DOI：10.1016/j.cej.2015.10.017 出版年：FEB 15 2016
摘要：Leachate, a highly polluted wastewater, is generated from landfill containing complex compositions which have great impact on the environment. The advanced treatment of biochemically treated landfill leachate using electrochemically assisted UV/chlorine process (UEC) in a flow reactor was investigated. The effects of pH and current density on COD and NH3-N removal by UEC process were evaluated. At the pH value of 5.0, current density of 60 mA/cm(2), the removal efficiencies for COD and NH3-N were observed as 77% and 87%, respectively. The electrochemical process alone (EC) could obtain relatively high NH3-N removal but very low COD removal, compared with which, the UEC process significantly promoted the removal efficiency of COD while that of NH3-N increased to a very limited extent. Most of NH3-N was converted into N-2 and little nitrogen compounds and chloramines were remained in the leachate after 8 h treatment. Moreover, the variations of active chlorine and chloride ions were monitored in the EC and UEC systems, and a possible mechanism was proposed for the UEC process. The in situ electro-generated active chlorine and photo-generated radical species should be responsible for the efficient degradation of landfill leachate. The total energy consumption and current efficiency were 216.5 (kW h/kg COD) and 17.5%, respectively, for 8 h treatment. In addition, the molecular weight (MW) percentage distribution analysis and PARAFAC analysis of excitation emission matrix (EEM) fluorescence spectroscopy indicated that the organic matters in the leachate were significantly degraded into the fractions with small molecular weight.
入藏号：WOS:000366790000056
文献类型：Article
语种：English
作者关键词：Landfill leachate, UV/chlorine, Electrolysis, COD, NH3-N, EEM
扩展关键词：DISSOLVED ORGANIC-MATTER; ELECTRO-FENTON OXIDATION; WASTE-WATER TREATMENT; RADICAL PRODUCTION; CHLORINE; REMOVAL; DEGRADATION; PHOTOLYSIS; COD; SPECTROSCOPY
通讯作者地址：Zhang, Hui; Wuhan Univ, Dept Environm Engn, Wuhan 430079, Peoples R China.
电子邮件地址：eeng@whu.edu.cn
地址：
[Ye, Zhihong; Zhang, Hui; Zhang, Xin; Zhou, Dejian]Wuhan Univ, Dept Environm Engn, Wuhan 430079, Peoples R China.
[Zhang, Hui] Wuhan Univ, Shenzhen Res Inst, Shenzhen 518057, Peoples R China.
研究方向：Engineering
ISSN：1385-8947
eISSN:1873-3212
影响因子（2014）：4.321
