摘要
采用浸渍固化法制备非均相Fenton催化剂载铁活性炭处理模拟铅锌选矿废水,确定催化剂最佳制备条件:食品级粉末活性炭为载体,用质量分数为5%的Fe_2(SO_4)_3溶液浸渍载体10h,固化温度120℃,固化时间2h。在非均相Fenton氧化降解实验中,当H_2O_2用量为0.4g/L、催化剂用量为1.4g/L、初始pH为5时,反应40 min后对模拟铅锌选矿废水COD去除率可达85.74%,出水COD为37.08mg/L,达到《铅、锌工业污染物排放标准》(GB 25466—2010)中的直接排放标准。制得的催化剂具有一定的重复使用能力,重复使用3次后COD去除率仍达到75%以上,但继续重复使用催化效果下降显著。机理分析显示,非均相Fenton反应主要通过铁离子催化及吸附作用共同使有机物去除。
The heterogeneous Fenton catalyst Fe-loaded activated carbon was prepared by impregnation solidification method for the treatment of simulated lead and zinc mineral processing wastewater.It was confirmed that the best preparation conditions of catalyst was food grade powder activated carbon as carrier,immobilized in Fe 2(SO 4)3 solution(5%of mass fraction)for 10 h and cured at 120℃for 2 h.The best heterogeneous Fenton oxidation performance was obtained when H 2O 2 dosage of 0.4 g/L,catalyst dosage of 1.4 g/L,and initial pH of 5,the maximum COD removal rate of simulated lead and zinc mineral processing wastewater could reach up to 85.74%after 40 min of treatment,and the effluent COD was 37.08 mg/L,which could meet the direct discharge standard of“Emission standard of pollutants for lead and zinc industry”(GB 25466-2010).The catalyst had good reusability.The removal rate of COD was still more than 75%after reusing 3 times,while the catalytic performance declined rapidly after then.The mechanism analysis showed that the removal of organics was the joint effects of iron ion catalytic mechanism and adsorption
作者
易龙生
刘超
何磊
YI Longsheng;LIU Chao;HE Lei(School of Minerals Processing and Bioengineering,Central South University,Changsha Hunan 410000)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2018年第3期329-333,338,共6页
Environmental Pollution & Control
关键词
非均相FENTON
催化剂
选矿废水
催化氧化
heterogeneous Fenton
catalyst
mineral processing wastewater
catalytic oxidation
