纳米Fe_3O_4强化混凝-Fenton氧化预处理垃圾渗滤液  

PRETREATMENT ON LANDFILL LEACHATE BY NANO-IRON OXIDE ENHANCED COAGULATION-FENTON OXIDATION

作　　者：戴红玲[1] 刘荣荣[1] 王少鹏[2] 聂发辉[1] 李静[2] 刘占孟[1] 

机构地区：[1]华东交通大学土木建筑学院,南昌330013 [2]邢台职业技术学院,河北邢台054035

出　　处：《环境工程》2016年第7期88-92,共5页Environmental Engineering

基　　金：国家自然科学基金(51468016);国家科技支撑项目(2014BAC04B03);江西省自然科学基金(20142BAB203027);江西省科技支撑计划项目(20151BBG70020);河北省科技支撑计划项目(15273628)

摘　　要：采用纳米Fe_3O_4与Fe Cl3制备复合混凝剂,利用混凝沉淀-Fenton氧化工艺预处理垃圾渗滤液原水,研究其处理效果。结果表明:在纳米Fe_3O_4投加量为2 g/L,Fe Cl3投加量为1.4 g/L时制备的复合混凝剂,在p H值为6.5,转速为300 r/min下快速搅拌1 min,转速为100 r/min下慢速搅拌30 min,沉淀时间为30 min的条件下,COD去除率为56.8%,ρ(COD)可由5 240 mg/L降低到2 264 mg/L;利用Fenton氧化处理混凝处理出水,在H_2O_2的投加量为5.5 g/L,n(H_2O_2)∶n(Fe2+)=4,p H值为6,反应时间为80 min,反应温度为25℃的最佳条件下,COD和氨氮的去除率分别为55.7%和40.1%,最终出水ρ(COD)和ρ(氨氮)分别为1 003 mg/L和670 mg/L;该组合工艺对垃圾渗滤液有较好的处理效果,COD、色度和氨氮的去除率分别为80.8%、59.5%和76.2%。The nano iron oxide and ferric chloride was used for preparation of complex coagulant,and the coagulation sedimentation-Fenton oxidation process was used as pretreatment for raw landfill leachate to evaluate the treatment effect. The results showed that COD removal rate reached 56. 8%,and COD decreased from 5 240 mg / L to 2 264 m / L,under the optimum condition as follows： the nano iron oxide dosage of 2 g / L,ferric chloride dosage of 1. 4 g / L（ for prepared the complex coagulant）,the p H of 6. 5,60 s＇ rapid stirring with the speed of 300 r / min and 30 mins＇ slow stirring with the speed of 100 r / min,sedimentation time of 30 min. Fenton reagent was applied as the oxidizing agent for the effluent of coagulation process. COD and ammonia nitrogen removal rates reached 55. 7% and 40. 1% under the optimum condition as follows： The H_2O_2 dosage of 5. 5 g / L,n（ H_2O_2） ∶ n（ Fe2 ＋） = 4,p H value of 6,the reaction time of 80 min,reaction temperature of 25 ℃;the combined coagulation sedimentation-Fenton oxidation process achieved better removal performance. The removal rates of COD,chroma and ammonia were 80. 8%,59. 5%,76. 2%,respectively.

关 键 词：纳米FE3O4 FECL3 混凝沉淀 FENTON氧化 垃圾渗滤液 

分 类 号：X703[环境科学与工程—环境工程]