摘要
采用催化湿式氧化法处理头孢类废水,以RCT为催化剂,考察了阴离子对污染物降解效果的影响。结果表明,不加阴离子时,RCT催化剂能有效催化污染物的降解,TOC和TN去除率分别为78.3%和85.9%;投加不同阴离子对反应的影响不同。RCT催化剂可将头孢氨苄废水中的有机N转化为N2,少部分以NO3-N形式存在;阴离子F^-、Cl^-、Br^-、I^-及SO4^2-对TN的降解影响不大,而NO3^-、PO4^3-、CO3^2-、SiO3^-2及B4O7^2-则明显抑制了对TN的去除。投加F^-、Cl^-、Br^-、I^-及NO3^-对TOC的降解有促进作用(I^->F^->Cl^->Br^->NO3^-),TOC的降解率提高了3.1~18.6个百分点;而投加SO4^2-、PO4^3-、CO3^2-、SiO3^2-及B4O7^2-对TOC的降解有抑制作用(SiO3^2->PO4^3->CO3^2->B4O7^2->SO4^2-),TOC的降解率降低了2.0~46.9个百分点。研究Cl-浓度对RCT催化剂降解效果的影响,当Cl-为0.1 mol·L^-1时,对TOC的去除有抑制作用,而较高的Cl-浓度(≥0.3 mol·L^-1)对TOC的去除却有促进作用,投加Cl-对TN的去除有促进作用,但随着Cl-浓度的增加[(0.1~0.8)mol·L^-1],TN的去除率变化不明显(约为88%)。
Catalytic wet air oxidation(CWAO)was employed to treat cephalosporin wastewater by RCT catalysts and the effect of typical inorganic anions on the performance of CWAO was investigated.Results showed that effectively degradation of pollutants could be acquired without anions,and the TOC and TN removal were 78.3%and 85.9%respectively.Most of the organic N was converted into N2 and a small part into NO3-N.Anions F^-,Cl^-,Br^-,I^-and SO4^2- had little effect on the degradation of TN,while NO3^-,PO4^3-,CO3^2-,SiO3^2- and B4O7^2-significantly inhibited the removal of TN.The presence of F^-,Cl^-,Br^-,I^-and NO-3 promote the degradation of TOC(I->F->Cl->Br->NO-3),and the TOC removal increased by 3.1%~18.6%.The presence of SO4^2-,PO4^3-,CO3^2-,SiO3^2- and B4O7^2- inhibited the degradation of TOC(SiO3^2->PO4^3->CO3^2->B4O7^2->SO4^2-),and the TOC removal decreased by 2.0%~46.9%.The effect of Cl-concentration on the CWAO performance was also investigated.The removal of TOC was inhibited at lower Cl-concntration(0.1 mol·L^-1),while higher Cl-concentration(≥0.3 mol·L^-1)could enhance the removal of TOC.The presence of Cl-promoted the removal of TN,but with the rise of Cl-concentration[(0.1~0.8)mol·L^-1],the TN removal did not change clearly(about 88%).
作者
李志平
刘伟军
李先如
马磊
Li Zhiping;Liu Weijun;Li Xianru;Ma Lei(Shanxi Unisdom Testing Technology Co.,Ltd.,Taiyuan 030006,Shanxi,China;Shanxi Jinhuankeyuan Environmental Resources Technology Co.,Ltd.,Taiyuan 030024,Shanxi,China;Zhangjiagang Industrial Technology Research Institute Co.,Ltd.,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Zhangjiagang 215600,Jiangsu,China;Beijing Key Laboratory of Fuel Cleanliness and Efficient Catalytic Reduction Technology,College of Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102600,China)
出处
《工业催化》
CAS
2020年第1期75-80,共6页
Industrial Catalysis
基金
山西省重点研发计划项目(201803D31003)
太原市万柏林区新兴产业培育专项(20190106)
关键词
水污染防治工程
催化湿式氧化
头孢氨苄废水
阴离子
RCT催化剂
water pollution preventing and controlling engineering
catalytic wet air oxidation
cephalexin
inorganic anions
Ru/TiO2 catalyst
