Metal ions and fiber are common compounds in the livestock and poultry manure,which will affect the fate of organic compounds in aqueous environment. However,limited research has addressed the effect of coexisting met...Metal ions and fiber are common compounds in the livestock and poultry manure,which will affect the fate of organic compounds in aqueous environment. However,limited research has addressed the effect of coexisting metal ions and fiber on the biodegradation of sulfonamide antibiotics. Accordingly, a compositing study was performed to assess the effect of metal ions(Fe3+and Cu2+) on the biodegradation of sulfadimethoxine sodium salt(SDM) in the presence of fiber. The enhanced adsorption of SDM onto fiber in the presence of metal ions can be attributed to the π+–π electron donor acceptor(EDA) interaction. The microbial(Phanerochaete chrysosprium) could easily attach onto fiber forming attached microbial, and the degradation rates of SDM of immobilized bacteria in the presence of Fe3 +were 100%, which were significantly higher than those of free bacteria(45%). This study indicates that Fe3 +and fiber could enhance the biodegradation of SDM. Fiber acts as adsorbent, carrier, and substrate which enhanced the removal of SDM.展开更多
The swine effluent studied was collected from scale pig farms,located in Yujiang County of Jiangxi Province,China,and duckweed（Spriodela polyrrhiza） was selected to dispose the effluent.The purpose of this study was...The swine effluent studied was collected from scale pig farms,located in Yujiang County of Jiangxi Province,China,and duckweed（Spriodela polyrrhiza） was selected to dispose the effluent.The purpose of this study was to elucidate the effects of duckweed growth on the dissolved organic matter composition in swine effluent.Throughout the experiment period,the concentrations of organic matter were determined regularly,and the excitationemission matrix（3DEEM） spectroscopy was used to characterize the fluorescence component.Compared with no-duckweed treatments（controls）,the specific ultra-violet absorbance at 254 nm（SUVA254） was increased by a final average of 34.4%as the phytoremediation using duckweed,and the removal rate of DOC was increased by a final average of 28.0%.In swine effluent,four fluorescence components were identified,including two protein-like（tryptophan,tyrosine） and two humic-like（fulvic acids,humic acids） components.For all treatments,the concentrations of protein-like components decreased by a final average of 69.0%.As the growth of duckweed,the concentrations of humic-like components were increased by a final average of 123.5%than controls.Significant and positive correlations were observed between SUVA254 and humic-like components.Compared with the controls,the humification index（HIX） increased by a final average of 9.0%for duckweed treatments.Meanwhile,the duckweed growth leaded to a lower biological index（BIX） and a higher proportion of microbial-derived fulvic acids than controls.In conclusion,the duckweed remediation not only enhanced the removal rate of organic matter in swine effluent,but also increased the percent of humic substances.展开更多
基金supported by the National Natural Science Foundation of China (No. 21477137)the Frontier Fields during the Thirteenth Five-Year Plan Period of the Institute of Soil Science, Chinese Academy of Sciences (No. ISSASIP 1658)the State Key Research & Development Program of China (No. 2016YFC0501309)
文摘Metal ions and fiber are common compounds in the livestock and poultry manure,which will affect the fate of organic compounds in aqueous environment. However,limited research has addressed the effect of coexisting metal ions and fiber on the biodegradation of sulfonamide antibiotics. Accordingly, a compositing study was performed to assess the effect of metal ions(Fe3+and Cu2+) on the biodegradation of sulfadimethoxine sodium salt(SDM) in the presence of fiber. The enhanced adsorption of SDM onto fiber in the presence of metal ions can be attributed to the π+–π electron donor acceptor(EDA) interaction. The microbial(Phanerochaete chrysosprium) could easily attach onto fiber forming attached microbial, and the degradation rates of SDM of immobilized bacteria in the presence of Fe3 +were 100%, which were significantly higher than those of free bacteria(45%). This study indicates that Fe3 +and fiber could enhance the biodegradation of SDM. Fiber acts as adsorbent, carrier, and substrate which enhanced the removal of SDM.
基金supported by the Special Fund for Agro-scientific Research in the Public Interest of China(No.201203050)the National Science Foundation of China(No.41171233)the Natural Science Foundation of Jiangsu Province,China(No.BK20131044)
文摘The swine effluent studied was collected from scale pig farms,located in Yujiang County of Jiangxi Province,China,and duckweed（Spriodela polyrrhiza） was selected to dispose the effluent.The purpose of this study was to elucidate the effects of duckweed growth on the dissolved organic matter composition in swine effluent.Throughout the experiment period,the concentrations of organic matter were determined regularly,and the excitationemission matrix（3DEEM） spectroscopy was used to characterize the fluorescence component.Compared with no-duckweed treatments（controls）,the specific ultra-violet absorbance at 254 nm（SUVA254） was increased by a final average of 34.4%as the phytoremediation using duckweed,and the removal rate of DOC was increased by a final average of 28.0%.In swine effluent,four fluorescence components were identified,including two protein-like（tryptophan,tyrosine） and two humic-like（fulvic acids,humic acids） components.For all treatments,the concentrations of protein-like components decreased by a final average of 69.0%.As the growth of duckweed,the concentrations of humic-like components were increased by a final average of 123.5%than controls.Significant and positive correlations were observed between SUVA254 and humic-like components.Compared with the controls,the humification index（HIX） increased by a final average of 9.0%for duckweed treatments.Meanwhile,the duckweed growth leaded to a lower biological index（BIX） and a higher proportion of microbial-derived fulvic acids than controls.In conclusion,the duckweed remediation not only enhanced the removal rate of organic matter in swine effluent,but also increased the percent of humic substances.
