化学破乳-芬顿氧化处理乳化液废水

西安工程大学学报JournalofXi'anPolytechnicUniversity第32卷第2期(总150期)2018年04月Vol.32,No.2(Sum.No.150)文章编号:1674-649X(2018)02-0175-06DOI:10.13338/j.issn.1674-649x.2018.02.009收稿日期:2017-08-28通信作者:宗刚(1970—),男,西安工程大学副教授,博士,研究方向为废水处理理论及资源化技术.E-mail:zonggang2008@163.com引文格式:张涛,宗刚.化学破乳-芬顿氧化处理乳化液废水[J].西安工程大学学报,2018,32(2):175-180.ZHANGTao,ZONGGang.Treatmentofemulsionwastewaterbythechemicaldemulsification-Fentonoxida-tion[J].JournalofXi'anPolytechnicUniversity,2018,32(2):175-180.化学破乳-芬顿氧化处理乳化液废水张涛,宗刚(西安工程大学环境与化学工程学院,陕西西安710048)摘要:针对机械加工乳化液废水稳定性好、COD浓度高,难以处理的问题,采用加热酸析和盐析相结合的方法进行破乳,并使用芬顿试剂进行氧化处理.通过单因素实验,考察相关因素对处理效果的影响,确定最佳工艺条件.结果表明,在100mL乳化液中加入0.75mL98%H2SO4,98%H2SO4与NaCl质量比为1∶1,温度为70℃,时间为150min条件下,废水的浊度和COD的去除率分别达到93.73%和56.95%;在芬顿氧化过程当,pH为3,H2O2用量为250mL/L,FeSO4·7H2O用量为6g/L时,COD去除率达65.7%;再调节pH至8,曝气投加PAC沉降后,COD降至10156mg/L,可生化性明显提高.关键词:加热破乳;酸析;芬顿氧化;化学破乳;乳化液废水中图分类号:X703文献标识码:ATreatmentofemulsionwastewaterbythechemicaldemulsification-FentonoxidationZHANGTao,ZONGGang(SchoolofEnvironmentalandChemicalEngineering,Xi'anPolytechnicUniversity,Xi'an710048,China)Abstract:Fortheproblemsofgoodstability,highCODconcentrationofemulsionwastewaterfrommechanicalprocessing,themethodofheatingacidandsalting-outisusedfordemulsifica-tion.Fentonreagentisusedforoxidationtreatment.Therelevantfactorsofthetreatmenteffectareinvestigatedbythesinglefactorexperiment,andtheoptimumtechnologicalcondi-tionsaredetermined.Theexperimentalresultsshowthatundertheconditionsofaddingaceticacidcontentof0.75mL98%H2SO4in100mLemulsion,massratiois98%H2SO4andNaCl1∶1,temperature70℃,time150min,theturbidityandCODremovalrateofwastewaterare93.73%and56.95%respectively.IntheFentonoxidationprocess,whenpHis3,thedosageofH2O2250mL/LandthedosageofFeSO4·7H2O6g/L,theremovalrateofCODis65.7%.WhenthepHisadjustedto8,aerationplusPACsedimentation,CODdropsto10156mg/L,biodegradabilityisthusgreatlyimproved.Keywords:heatingdemulsification;acidprecipitation;Fentonoxidation;chemicaldemulsifica-tion;emulsionwastewater0引言金属加工普遍使用乳化剂来冷却和润滑刀具以及加工件,乳化剂因此又被称为冷却液、润滑液.目前,使用的乳化