文献类型：期刊文献

英文题名：Two-stage coagulation process for enhanced oil removal from coal chemical wastewater

作者：Chen, Xiurong[1,2];Sun, Xiaoli[1,2];Xu, Peng[1,2];Yang, Chenchen[1,2];Lu, Quanling[1,2];Wang, Shanshan[1,2];Li, Qiuyue[1,2];Wei, Xiao[1,2];Yang, Yingying[1,2];Wang, Yuan[1,2]

机构：[1]East China Univ Sci & Technol, Protect Key Lab Environm Risk Assessment & Contro, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Natl Engn Lab Highconcentrat Refractory Organ Was, Shanghai, Peoples R China

年份：2020

卷号：55

期号：14

起止页码：1563

外文期刊名：JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING

收录：;EI(收录号：20210109724907);WOS:【SCI-EXPANDED(收录号:WOS:000603903700001)】；

基金：This research was supported by the National Key Research and Development Program of China (2017YFB0602804), the Major Projects of Science and Technology (No. 2014ZX07202-011) in China, the National Natural Science Foundation (No. 51378207), and the Shanghai Pujiang Programme (No. 13PJD009).

语种：英文

外文关键词：Coagulation; two-stage process; oil removal; coal gasification wastewater; wastewater pretreatment

摘要：As a common pretreatment process for coal chemical wastewater, the conventional one-stage coagulation process has the problem of poor removal of small size oil, which will inhibit the subsequent biological treatment. Measures to improve oil removal efficiency based on the development of new coagulants and the addition of composite processes are common in the literature, but two-stage coagulation to improve coagulation efficiency has not been reported to date. Here, we optimized coagulation parameters and compared the oil removal efficiency of two-stage coagulation and one-stage coagulation. Under the same total dosage of coagulant (PAC), the optimum removal of oil in two-stage coagulation was achieved 90% which increased by 11% compared to one-stage process. P10 and P 1 mu m were proposed to evaluate the oil removing effect of two-stage coagulation. In addition, SEM scanning was used to conduct flocs analysis and two-stage coagulation process simulation, revealing the principle of the excellent oil removal performance of two-stage coagulation. Finally, coagulant in filter residue was recovered by acidification method and the recovered coagulant was used again in the two-stage coagulation process of coal chemical wastewater. These results suggest that two-stage coagulation is a cost-effective alternative oil removal technique with high energy efficiency and environmental benign. This research may offer helpful insights to develop an advanced oil removal process.