[Objectives]To treat pig farm wastewater and solve the problem of pollution caused by it to surface water or groundwater.[Methods]Fe and Zn/biochar(AC)was prepared by dipping method using pig manure-derived biochar as...[Objectives]To treat pig farm wastewater and solve the problem of pollution caused by it to surface water or groundwater.[Methods]Fe and Zn/biochar(AC)was prepared by dipping method using pig manure-derived biochar as carrier.The preparation conditions were investigated,and the screened metal-loaded biochar was characterized.Pig farm waste water was treated with metal-loaded biochar-H2O2 catalytic oxidation method.[Results]At the COD concentration of 2904 mg/L,0.02 g Zn/AC and 0.005 mL H2O2 showed the highest COD removal rate(qe)from pig breeding wastewater under conditions of reaction time of 8 h,pH value of 7 and temperature of 55℃,reaching 70.98%.[Conclusions]Fe or Zn-loaded biochar made from pig manure-derived activated carbon has a certain catalytic capacity for the actual oxidation treatment of pig farm wastewater.The activity of Zn/AC was higher,and its COD removal rate from pig farm wastewater was also higher.展开更多
The physicochemical properties of Pt-,Pd-and Rh-loaded(Ce,Zr,La)O_(2)(shorted for CZL)catalysts before/after aging treatment were systematically characterized by various techniques to illustrate the relationship of th...The physicochemical properties of Pt-,Pd-and Rh-loaded(Ce,Zr,La)O_(2)(shorted for CZL)catalysts before/after aging treatment were systematically characterized by various techniques to illustrate the relationship of the dynamic oxygen storage/release capacity and redox ability with their catalytic performances for HC,NO_(x)and CO conversions.Pt/CZL catalyst exhibits the optimum catalytic performance for HC and NO_(x)elimination,which mainly contribute to its excellent redox ability and dynamic oxygen storage/release capacity(DOSC)at lower temperature due to the stronger PM(precious metals)-support interaction.However,the worse stability of Pt-O-Ce species and volatile Pt oxides easily result in the dramatical decline in catalytic activity after aging.Pd/CZL shows higher catalytic activity for CO conversion by reason of more Olatt species as the active oxygen for CO oxidation reaction.Rh/CZL catalyst displays the widest dynamic operation window for NO_(x)elimination as a result of greater oxygen mobility at high temperature,and the ability to retain more Rh-O-Ce species after calcined at 1100℃effectively restrains sintering of active RhOx species,improving the thermal stability of Rh/CZL catalyst.展开更多
基金Scientific and Technological Innovation Project of Jingjiang City,Jiangsu Province(HDCXJ6001).
文摘[Objectives]To treat pig farm wastewater and solve the problem of pollution caused by it to surface water or groundwater.[Methods]Fe and Zn/biochar(AC)was prepared by dipping method using pig manure-derived biochar as carrier.The preparation conditions were investigated,and the screened metal-loaded biochar was characterized.Pig farm waste water was treated with metal-loaded biochar-H2O2 catalytic oxidation method.[Results]At the COD concentration of 2904 mg/L,0.02 g Zn/AC and 0.005 mL H2O2 showed the highest COD removal rate(qe)from pig breeding wastewater under conditions of reaction time of 8 h,pH value of 7 and temperature of 55℃,reaching 70.98%.[Conclusions]Fe or Zn-loaded biochar made from pig manure-derived activated carbon has a certain catalytic capacity for the actual oxidation treatment of pig farm wastewater.The activity of Zn/AC was higher,and its COD removal rate from pig farm wastewater was also higher.
基金This work was supported by Key Program of Science Technology Department of Zhejiang Province(No.2018C03037).
文摘The physicochemical properties of Pt-,Pd-and Rh-loaded(Ce,Zr,La)O_(2)(shorted for CZL)catalysts before/after aging treatment were systematically characterized by various techniques to illustrate the relationship of the dynamic oxygen storage/release capacity and redox ability with their catalytic performances for HC,NO_(x)and CO conversions.Pt/CZL catalyst exhibits the optimum catalytic performance for HC and NO_(x)elimination,which mainly contribute to its excellent redox ability and dynamic oxygen storage/release capacity(DOSC)at lower temperature due to the stronger PM(precious metals)-support interaction.However,the worse stability of Pt-O-Ce species and volatile Pt oxides easily result in the dramatical decline in catalytic activity after aging.Pd/CZL shows higher catalytic activity for CO conversion by reason of more Olatt species as the active oxygen for CO oxidation reaction.Rh/CZL catalyst displays the widest dynamic operation window for NO_(x)elimination as a result of greater oxygen mobility at high temperature,and the ability to retain more Rh-O-Ce species after calcined at 1100℃effectively restrains sintering of active RhOx species,improving the thermal stability of Rh/CZL catalyst.
