磁性聚合硫酸铁混凝—NaClO氧化处理垃圾渗滤液  

MPFS coagulation-NaClO oxidation for treatment of landfill leachate

作　　者：刘占孟[1] 刘荣荣[1] 聂发辉[1] 

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013

出　　处：《环境污染与防治》2016年第3期16-19,24,共5页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.51468016;No.51168013);国家科技支撑计划项目(No.2014BAC04B03);江西省自然科学基金资助项目(No.20142BAB203027);江西省科技支撑计划项目(No.20151BBG70020)

摘　　要：采用化学还原法制备的纳米Fe3O4与聚合硫酸铁(PFS)复合制备磁性聚合硫酸铁(MPFS)混凝剂,利用MPFS混凝—NaClO氧化组合工艺处理垃圾渗滤液,用单因素实验确定最佳运行参数。结果表明:MPFS对COD的去除效果优于PFS,在纳米Fe3O4与PFS的质量比为1∶3、MPFS投加质量浓度为3.5g/L、pH为6.5、混凝时间为25 min时,混凝效果最佳;混凝出水在NaClO投加摩尔浓度为140mmol/L、pH为6.0、氧化温度为50℃、氧化时间为65 min时,氧化效果最佳。在最佳运行条件下,MPFS混凝—NaClO氧化组合工艺对垃圾渗滤液COD、色度和氨氮的去除率分别达到88.2%、77.4%、80.3%。A composite coagulant of magnetic polymeric ferric sulfate （MPFS） was prepared by the polymeric ferric sulfate （PFS） and magnetic Fe3O4 nanoparticles which were prepared by chemical reduction method. Experi- ments for landfill leachate were conducted by using combined MPFS coagulation and NaCIO oxidation process. Work- ing conditions of the combined process were optimized by single factor experiment. Results showed that the coagula- tion efficiencies of MPFS were better than those of PFS. The optimum working conditions for coagulation were as fol- lows ： Fe3O4/PFS= 1 ：3 （mass ratios）, MPFS mass concentration of 3.5 g/L, coagulation time of 25 min,and pH of 6.5. The coagulation effluent was further treated by NaClO oxidation. The optimum working conditions for oxidation were as follows： NaClO molar concentration of 140 mmol/L,oxidation time of 65 min, oxidation temperature of 50 ℃, and pH of 6.0. By combined process, removal rate could be enhanced to 88.2%, 77.4% and 80.30%for COD, color and ammonia nitrogen, respectively.

关 键 词：纳米FE3O4 聚合硫酸铁 磁性聚合硫酸铁混凝 NaClO氧化 垃圾渗滤液 

分 类 号：X703[环境科学与工程—环境工程]