Two biological nitrogen removal processes are compared in the aspect of nitrogen removal, process operation and energy saving. Results show that when the returned sludge ratio is 50% of the inflow rate, the step-feedi...Two biological nitrogen removal processes are compared in the aspect of nitrogen removal, process operation and energy saving. Results show that when the returned sludge ratio is 50% of the inflow rate, the step-feeding process achieves over 80% total nitrogen （TN） removal efficiency, but the TN removal efficiency of the A/O process is only 40%. Moreover, filamentous sludge bulking can be well restrained in the step-feeding process. Given the conditions of a returned sludge ratio of 100% and a nitrifying liquor recycle ratio of 200%, the TN removal efficiency is 78.32% in the A/O process, but the sludge volume index （SVI） value increases to 143 mL/g. In the step-feeding process, the SVI is only 94.4 mL/g when the TN removal efficiency reaches 81. 1%. The step-feeding process has distinct advantages over the A/O process in the aspects of practicability, nitrogen removal and operating stability.展开更多
Cu2O/TiO2 catalyst was prepared by the modification of TiO2 with Cu（NO3）2 through combined ultrasonic resonance and impregnation method. The samples were characterized by X-ray diffraction （XRD）, N2 adsorption-des...Cu2O/TiO2 catalyst was prepared by the modification of TiO2 with Cu（NO3）2 through combined ultrasonic resonance and impregnation method. The samples were characterized by X-ray diffraction （XRD）, N2 adsorption-desorption （BET）, UV-vis diffuse reflectance spectroscopy （DRS） and X-ray photoelectron spectroscopy （XPS）. The catalyst was used for photocatalysis denitrogenation of pyridine in an octane solution under visible light. Pyridine was taken as the probe molecule to study the denitrogenation property of Cu2O/TiO2. The best performance in the photocatalytic denitrogenation of model oil containing pyridine was 85% under the conditions of Cu loading concentration of 0.5 mol/L, calcination temperature of 400 ℃ and calcination time of 5 h.展开更多
This paper relates to highly dispersed supported Pd/MWCNTs and Fd/a-Al2O3 catalysts prepared by biological reduction method. The physico-chemical properties and the difference in catalytic activity of Pd catalysts pre...This paper relates to highly dispersed supported Pd/MWCNTs and Fd/a-Al2O3 catalysts prepared by biological reduction method. The physico-chemical properties and the difference in catalytic activity of Pd catalysts prepared by bio- logical reduction method and chemical method, respectively, were investigated using XRD, TEM and specific surface char- acterization methods. The catalytic properties of catalysts were studied through activity evaluation means. The test results showed that the catalysts prepared by biological method were characteristic of small Pd nanoparticle size, good dispersion and low agglomeration, while possessing a high activity and stability in styrene hydrogenation reaction in comparison with catalysts prelgared via the chemical method.展开更多
A series of rotenone O-alkyl oxime derivatives was designed and synthesized. Their structures were confirmed by elemental analyses, Fourier transform infrared（FTIR） and 1H NMR spectral studies, and the typical cryst...A series of rotenone O-alkyl oxime derivatives was designed and synthesized. Their structures were confirmed by elemental analyses, Fourier transform infrared（FTIR） and 1H NMR spectral studies, and the typical crystal structure of rotenone O-ethyl oxime（3b） was determined by X-ray diffraction. The preliminary biological activities of the new compounds were evaluated. The results of bioassays indicate that the title compounds exhibit moderate insecticidal and bactericidal activities. Among the synthesized compounds, compound 3q exhibited 90.0% mortality against M. separata at 1000 μg/mL. Compounds 3b and 3g exhibited both 90.0% inhibition rate against R. solani at 500 μg/mL, respectively.展开更多
基金The Project of Scientific Research Base and Scientific Innovation Platform of Beijing Municipal Education Commission (No.PXM2008-014204-050843)the Project of Beijing Science and Technology Committee (No.D07050601500000)+1 种基金the Knowledge Innovation Program of the Chinese Academy of Sciences (No.RCEES-QN-200706)the Special Funds for Young Scholars of RCEES,CAS.
文摘Two biological nitrogen removal processes are compared in the aspect of nitrogen removal, process operation and energy saving. Results show that when the returned sludge ratio is 50% of the inflow rate, the step-feeding process achieves over 80% total nitrogen （TN） removal efficiency, but the TN removal efficiency of the A/O process is only 40%. Moreover, filamentous sludge bulking can be well restrained in the step-feeding process. Given the conditions of a returned sludge ratio of 100% and a nitrifying liquor recycle ratio of 200%, the TN removal efficiency is 78.32% in the A/O process, but the sludge volume index （SVI） value increases to 143 mL/g. In the step-feeding process, the SVI is only 94.4 mL/g when the TN removal efficiency reaches 81. 1%. The step-feeding process has distinct advantages over the A/O process in the aspects of practicability, nitrogen removal and operating stability.
基金financially supported by the Science and Technology Project of Fujian Province(Nos.2007J0359,2006F5030,CE0015) Ningde Normal University projects on serving the western coast to the TW strait (No. 2010H103)the National-level College Students’ Innovative Entrepreneurial Training Plan Project of Fujian Normal University (No. 201210394005)
文摘Cu2O/TiO2 catalyst was prepared by the modification of TiO2 with Cu（NO3）2 through combined ultrasonic resonance and impregnation method. The samples were characterized by X-ray diffraction （XRD）, N2 adsorption-desorption （BET）, UV-vis diffuse reflectance spectroscopy （DRS） and X-ray photoelectron spectroscopy （XPS）. The catalyst was used for photocatalysis denitrogenation of pyridine in an octane solution under visible light. Pyridine was taken as the probe molecule to study the denitrogenation property of Cu2O/TiO2. The best performance in the photocatalytic denitrogenation of model oil containing pyridine was 85% under the conditions of Cu loading concentration of 0.5 mol/L, calcination temperature of 400 ℃ and calcination time of 5 h.
文摘This paper relates to highly dispersed supported Pd/MWCNTs and Fd/a-Al2O3 catalysts prepared by biological reduction method. The physico-chemical properties and the difference in catalytic activity of Pd catalysts prepared by bio- logical reduction method and chemical method, respectively, were investigated using XRD, TEM and specific surface char- acterization methods. The catalytic properties of catalysts were studied through activity evaluation means. The test results showed that the catalysts prepared by biological method were characteristic of small Pd nanoparticle size, good dispersion and low agglomeration, while possessing a high activity and stability in styrene hydrogenation reaction in comparison with catalysts prelgared via the chemical method.
基金Supported by the National Science and Technology Pillar Program of China(No.2011BAE06B01)
文摘A series of rotenone O-alkyl oxime derivatives was designed and synthesized. Their structures were confirmed by elemental analyses, Fourier transform infrared（FTIR） and 1H NMR spectral studies, and the typical crystal structure of rotenone O-ethyl oxime（3b） was determined by X-ray diffraction. The preliminary biological activities of the new compounds were evaluated. The results of bioassays indicate that the title compounds exhibit moderate insecticidal and bactericidal activities. Among the synthesized compounds, compound 3q exhibited 90.0% mortality against M. separata at 1000 μg/mL. Compounds 3b and 3g exhibited both 90.0% inhibition rate against R. solani at 500 μg/mL, respectively.
