文献类型：期刊文献

英文题名：Treatment of electric desalting wastewater by swirling flotation coupled with medium coalescence

作者：Wu, Shihan[1];Liu, Yiqian[1];Pan, Zhicheng[1];Dai, Pinyi[1];Yang, Qiang[1,2];Lu, Hao[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Natl Engn Lab Ind Wastewater Treatment, Shanghai 200237, Peoples R China

年份：2021

卷号：9

期号：5

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：;EI(收录号：20213010692946);WOS:【SCI-EXPANDED(收录号:WOS:000703618800004)】；

基金：This work was supported by the National Natural Science Foundation of China (grant numbers 52000072, 52025103) and the National Key Research and Development Project (grant number 2019YFA0705800) .

语种：英文

外文关键词：Electric desalting wastewater; Oil removal; Swirling flotation; Multiple mediums

摘要：The treatment of electric desalting wastewater with a high oil content and strong emulsification is one of the most difficult problems in refineries. An industrial pilot study was carried out using swirling flotation coupled with medium coalescence. The self-adaptive structure was designed for swirling flotation and the coalescence medium was a combination of fibers and granules. The effects of the flow rate, gas injection mode, gas flow rate, and the depth of the medium bed on the separation performance were investigated. Under optimum operating conditions, when the inlet oil content is 400-2500 mg/L, the oil removal efficiency of the swirling flotation is 90% and the total oil removal efficiency is up to 98.63%. The oil content, suspended solids content, and chemical oxygen demand (COD) of the effluent can be stabilized below 30 mg/L, 15 mg/L, and 700 mg/L, respectively, which meets the requirements for discharge to a downstream treatment plant. This study provides a new technical idea for the treatment of electric desalting wastewater with the advantages of a high operation elasticity, a rapid treatment process, and a high efficiency.