Abstract:For the heterogeneous reactions of organic-pollutants in wastewater, a novel reactor, the induction-heating fixed bed reactor (IHFB) realizes the targeted energy transfers on the micro-interface of catalyst particles. Due to the high temperature on the solid-liquid phase interface deriving from the ferromagnetic heating, the degradation of aqueous organic pollutants was significantly promoted with the lower energy consumption. The decolorization experiments showed that the decolorization percentage could reach 93.5% after running 30minutes in the optimal reaction conditions, i.e. influent pH 6~7and 30℃, HRT of 2.08min. The UV-vis absorption peak of direct blending purple (D-BL) at 554nm disappeared after Ni-SI react with D-BL. SEM-EDS revealed the formation of iron oxide and iron hydroxides on the surface of Ni-SI after degradation of direct blending purple (D-BL) after D-BL reaction. A degradation mechanism of direct blending purple (D-BL) was proposed. First, molecular was adsorded on the surface of modified sponge iron, then the iron nanoparticles react with water to produce hydrogen radical by the Ni catalysis and local high temperature, finally the hydrogen radical destroied the most toxic conjugated double bond and benzene ring in D-BL molecular. In addition, in the optimal operation conditions, the decolorization percentages of the acid black (10B), the direct red (D-GLN) and the real dye wastewater reached 82%, 78% and 81% respectively. The study revealed that IHBF had a tremendous application potential in dye wastewater treatment.
王明, 李剑超, 毛勇, 李青, 徐娜, 靳菁, 郑伟. 海绵铁感应热固定床对染料废水脱色研究[J]. 中国环境科学, 2014, 34(2): 337-344.
WANG Ming, LI Jian-Chao, MAO Yong, LI Qing, XU Na, JIN Jing, ZHENG Wei. Decolorization of dye wastewater with spongy-iron induction-heating fixed bed reactor (IHFB). CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(2): 337-344.