文献类型：期刊文献

英文题名：Photocatalytic degradation of rolling emulsion wastewater over titanium dioxide suspensions

作者：Jiang, Peng[1];Li, Yun[1];Han, Amanda[2];Chen, Xue-Qin[1];Zhou, Xiao-Long[1]

机构：[1]East China Univ Sci & Technol, Inst Chem Engn, Int Joint Res Ctr Green Chem Engn, Shanghai 200237, Peoples R China;[2]Ethoca Chem Inc, 88 Feng Yang Rd, Shanghai 200040, Peoples R China

年份：2020

卷号：200

起止页码：196

外文期刊名：DESALINATION AND WATER TREATMENT

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000579045000018)】；

语种：英文

外文关键词：Photocatalysis; Wastewater; Titanium dioxide; COD; E-EO

摘要：The rolling emulsion wastewater produced during steel production is harmful to the environment. Photocatalytic degradation over titanium dioxide (TiO2) suspensions is employed to purify this wastewater under ultraviolet irradiation. The degradation of the pollutants in the wastewater is mainly attributed to photocatalysis and not photolysis. The impacts of the TiO2 dosage and the pH on the degradation, as well as the concentration of dissolved oxygen (DO) on the retention time, are studied. Furthermore, the effect of agglomeration on the chemical oxygen demand (COD) removal efficiency is discussed. The distribution of photo-holes and the surface charge of TiO2 change with the pH. The optimal parameters are as follows: a TiO2 dosage of 4 g/L and an initial pH of 7.9. After 210 h of reaction under these conditions, the COD concentration decreases to 197.16 mg/L, and the wastewater after treated meet the indirect discharge standard. The duration of degradation can be shortened to 120 h by increasing the DO content to 10.75 mg/L in wastewater. In addition, the electrical energy consumption (E-EO = 2.237 x 10(3) kW h/m(3)/order) for the photocatalytic degradation of rolling emulsion wastewater is provided.