文献类型：期刊文献

英文题名：Freeze-thaw method for oil recovery from waste cutting fluid without chemical additions

作者：Feng, Wanli[1];Yin, Yao[1,2];Mendoza, Maria de Lourdes[3];Wang, Lidong[1];Chen, Xiaoyuan[1];Liu, Yongdi[1];Cai, Lankun[1];Zhang, Lehua[1]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Shanghai Municipal Engn Design Inst Grp Co Ltd, Shanghai 200092, Peoples R China;[3]Super Polytech Sch Coast, FCNM, Dept Chem & Environm Sci, ESPOL, EC-090112 Guayaquil, Ecuador

年份：2017

卷号：148

起止页码：84

外文期刊名：JOURNAL OF CLEANER PRODUCTION

收录：;EI(收录号：20171103437197);WOS:【SCI-EXPANDED(收录号:WOS:000398425700009)】；

基金：This work was supported by the National Natural Science Foundation of China (20906026) and Shanghai Pujiang Program (09PJ1402900).

语种：英文

外文关键词：Oil recovery; Chemical additions; Fat Freeze-thaw method; Waste cutting fluid

摘要：The effective disposal of waste cutting fluid has received increasing attention in recent years. This study focuses on the treatment of waste cutting fluid by freeze-thaw method. The influences of freezing medium, freezing temperature, freezing time, NaCl content and pH on treatment efficiency were studied. The COD removal rate of waste cutting fluid was about 80% and oil recovery reached 3700 mg/L at the freezing temperature of -8 degrees C for 8 h without NaCl addition or pH adjustment. The micrograms of initial and treated waste cutting fluid showed that the particles of oil droplets in wastewater were significantly larger after freeze-thaw process and easier to gather and separation. Infrared spectroscopy studies indicated that the oil recovered from waste cutting fluid precipitation was mainly composed of esters. Up to 3.7 kg fat extract was recovered from 1 m(3) of waste cutting fluid, while the required power of this freezing process is 42.90 kW h by theoretical calculation. Thus, freeze-thaw method appears to be effective and feasible for waste cutting fluid treatment. (C) 2017 Elsevier Ltd. All rights reserved.