The Mechanism of Sunlight/Fenton in Treating Oilfield Wastewater
DUAN Yun-min1, WU Bin-bin1, WANG An-jing1, ZHANG Nai-dong1，2*, ZHENG Tong2
1. College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China
2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
Abstract：The effect of disposing the oil wastewater in Liaohe Oilfield by sunlight/Fenton method was studied in this paper, and the reason why the sunlight/Fenton method was better than the common Fenton method was analyzed. The wastewater mainly contains benzene and alkane compounds. Effect of sunlight/Fenton method on oil field wastewater treatment in Liaohe was related to height of the water layer. The removal rate of aqueous COD decreased when the height of the water layer increased, and the penetration ability of sunlight to this oilfield wastewater was about 1 m. When the height of wastewater was about 40 cm, COD of wastewater reduced from 430 to 63.2 mg·L-1 after treatment of oil wastewater by sunlight/Fenton method. It is proved that the form of the poly ferric compounds generated in the system by using the UV-Vis spectroscopy, infrared spectroscopy (FTIR) and X-ray diffraction method (XRD) is the same as the poly ferric compounds generated by the common Fenton system. At the same time, the transformation processes of benzene and alkanes were studied by UV-Vis spectroscopy which indicated that the transformation processes of alkanes in sunlight/Fenton were as same as the common Fenton method; enzene could be converted into photosensitive molecules activated by hydroxyl radical in sunlight/Fenton system. Thus, the sensitivities of the aromatic intermediates are the reason why the sunlight/Fenton method is more efficient than the common Fenton method.
[1] LIANG Qian, DUAN Yun-min, WU Bin-bin, et al(梁 倩, 段云敏, 吴彬彬, 等). Ciesc Journal(化工学报), 2016, 67: 1527.
[2] YANG Xue, ZHANG Jing-cheng, GUAN Xiao- hong(杨 雪, 张景成, 关小红). Environmental Science(环境科学), 2012, 33: 1221.
[3] Maezono T, Tokumura M, Sekine M, et al. Chemosphere, 2011, 82: 1422.
[4] Liu S Q, Cheng S, Feng L R, et al. Journal of Hazardous Materials, 2010, 182: 675.
[5] He H Y, Fei J, Lu J. Micro & Nano Letters, 2015, 10: 389.
[6] Bai C, Xiao W, Feng D, et al. Chemical Engineering Journal, 2013, 215-216: 227.
[7] LIU Mei, ZHU Peng-fei(刘 梅, 朱鹏飞). Environmental Chemistry(环境化学), 2012, 31: 1227.
[8] Ma S J, Fu M L, Li F W, et al. Advanced Materials Research, 2011, 233-235: 523.
[9] Lu M, Zhang Z, Qiao W, et al. Bioresource Technology, 2010, 101: 2106.
[10] Yamada M, Karlin K D, Fukuzumi S. Chemical Science, 2016, 7: 2856.
[11] Pirnat K, Mali G, Gaberscek M, et al. Journal of Power Sources, 2016, 315: 169.
[12] Grannas A M, Pagano L P, Pierce B C, et al. Environmental Science and Technology, 2014, 48: 10725.
[13] Sági G, Csay T, Szabó L, et al. J Pharmacists Biomed, 2015, 106: 52.
