The characterization of the algae Anabaena cylindrical solution with Fe(III)was investigated using fluorescence emission and synchronous-scan spectroscopy.The ranges ofconcentrations of algae and Fe(III)in aqueous sol...The characterization of the algae Anabaena cylindrical solution with Fe(III)was investigated using fluorescence emission and synchronous-scan spectroscopy.The ranges ofconcentrations of algae and Fe(III)in aqueous solutions were 5.0 X 10~7-2.5 X10^8 cell/L and 10-60mu mol/L,respectively.The effective characterization method used was synchronous-scanfluorescence spectroscopy(SFS).The wavelength difference(triangle open lambda)of 90 nm wasmaintained between excitation wavelength(lambda_(ex))and emissionwavelength(lambda_(em)).The peakwas observed at about lambda_(ex)236 nm/lambda_(em)326 nm for synchronous-scan fluorescencespectroscopy.The fluorescence quenching in system of algae-Fe(III)-HA was studied usingsynchronous-scan spectroscopy forthe first time,Fe(III)was clearly the effective quencher.Therelationship between I_0/I(quenching efficiency)and c(concentration of Fe(III).added)was alinear correlation for the algae solution with Fe(III).Also,Aldrich humic acid(HA)was found tobe an effective quencher.展开更多
Anaerobic digestion of biomasses originates different products, the most abundant of which are methane and carbon dioxide. During this process, a 60-70% organic matter reduction occurs and the final product, the diges...Anaerobic digestion of biomasses originates different products, the most abundant of which are methane and carbon dioxide. During this process, a 60-70% organic matter reduction occurs and the final product, the digestate, is charac- terized by high biological stability and high contents of recalcitrant organic molecules and nutrients. In the present work digestates obtained by different mixture of biomasses in a full-scale co-digestion plant operating in Italy were characterized as whole samples without any pre-treatment or extraction by means of Fourier transform infrared spec- troscopy and fluorescence spectroscopy in the synchronous-scan mode and results were compared to those obtained on the single fresh substrates. Biomasses considered were: beef cattle slurry, maize or sorghum silage, agro-industrial residues, olive residues and olive mill wastewater. These substrates exhibited typical spectra related to their different chemical composition. Results obtained on digestates provided evidence of distinctive characteristic of the final product as a function of the different composition of the biomasses loaded into the digestion plant. We concluded that FTIR and fluorescence spectra of digestates produced in a real co-digestion plant “inherit” the main spectroscopic features of the organic wastes from which they are produced. Spectroscopic techniques used in this work succeeded in qualitatively characterizing and differentiating digestates obtained from biomasses of different chemical composition.展开更多
基金Supported by the National Natural Science Foundation of China(20177017)the Scientific Research Foundation of Wuhan Environmental Pro tection Bureau
文摘The characterization of the algae Anabaena cylindrical solution with Fe(III)was investigated using fluorescence emission and synchronous-scan spectroscopy.The ranges ofconcentrations of algae and Fe(III)in aqueous solutions were 5.0 X 10~7-2.5 X10^8 cell/L and 10-60mu mol/L,respectively.The effective characterization method used was synchronous-scanfluorescence spectroscopy(SFS).The wavelength difference(triangle open lambda)of 90 nm wasmaintained between excitation wavelength(lambda_(ex))and emissionwavelength(lambda_(em)).The peakwas observed at about lambda_(ex)236 nm/lambda_(em)326 nm for synchronous-scan fluorescencespectroscopy.The fluorescence quenching in system of algae-Fe(III)-HA was studied usingsynchronous-scan spectroscopy forthe first time,Fe(III)was clearly the effective quencher.Therelationship between I_0/I(quenching efficiency)and c(concentration of Fe(III).added)was alinear correlation for the algae solution with Fe(III).Also,Aldrich humic acid(HA)was found tobe an effective quencher.
文摘Anaerobic digestion of biomasses originates different products, the most abundant of which are methane and carbon dioxide. During this process, a 60-70% organic matter reduction occurs and the final product, the digestate, is charac- terized by high biological stability and high contents of recalcitrant organic molecules and nutrients. In the present work digestates obtained by different mixture of biomasses in a full-scale co-digestion plant operating in Italy were characterized as whole samples without any pre-treatment or extraction by means of Fourier transform infrared spec- troscopy and fluorescence spectroscopy in the synchronous-scan mode and results were compared to those obtained on the single fresh substrates. Biomasses considered were: beef cattle slurry, maize or sorghum silage, agro-industrial residues, olive residues and olive mill wastewater. These substrates exhibited typical spectra related to their different chemical composition. Results obtained on digestates provided evidence of distinctive characteristic of the final product as a function of the different composition of the biomasses loaded into the digestion plant. We concluded that FTIR and fluorescence spectra of digestates produced in a real co-digestion plant “inherit” the main spectroscopic features of the organic wastes from which they are produced. Spectroscopic techniques used in this work succeeded in qualitatively characterizing and differentiating digestates obtained from biomasses of different chemical composition.
